Details of the Researcher

PHOTO

Tomohiro Otsuka
Section
Advanced Institute for Materials Research
Job title
Associate Professor
Degree
  • 修士(理学)(東京大学)

  • 博士(理学)(東京大学)

e-Rad No.
50588019

Research History 20

  • 2025/05 - Present
    National Institute for Materials Science Research Center for Materials Nanoarchitechtonics Chief Invited Researcher

  • 2024/04 - Present
    Tohoku University Research Center for Neutrino Science Associate Professor

  • 2022/04 - Present
    Tohoku University Advanced Institute for Materials Research Associate Professor

  • 2020/08 - Present
    Tohoku University Tohoku Quantum Alliance Co-director

  • 2019/12 - Present
    Organization for Advanced Studies Associate Professor

  • 2019/04 - Present
    Center for Science and Innovation in Spintronics, Tohoku University Associate Professor

  • 2018/04 - Present
    Department of Electrical Engineering, School of Engineering, Tohoku University Associate Professor

  • 2018/02 - Present
    Research Institute of Electrical Communication, Tohoku University (Quantum Devices (Otsuka Group), Information Devices Division) Associate Professor

  • 2018/02 - Present
    RIKEN (Center for Emergent Matter Science, Quantum Functional System Research Group) Visiting Researcher

  • 2018/04 - 2022/03
    Center for Spintronics Research Network, Tohoku University Associate Professor

  • 2018/02 - 2022/03
    Leading Initiative for Excellent Young Researchers, MEXT-Japan

  • 2016/10 - 2020/03
    JST, PRESTO Project Researcher

  • 2013/04 - 2020/03
    Department of Applied Physics, University of Tokyo (Tarucha-Yamamoto Lab) Visiting Researcher

  • 2016/01 - 2018/01
    RIKEN (Center for Emergent Matter Science, Quantum Functional System Research Group) Research Scientist

  • 2013/04 - 2015/12
    RIKEN (Quantum Functional System Research Group, Center for Emergent Matter Science) Postdoctoral Researcher

  • 2012/09 - 2013/03
    RIKEN (Emergent Quantum Function Research Team, Functional Emergent-matter Research Group, Emergent Materials Department, Advanced Science Institute) Visiting Researcher

  • 2010/04 - 2013/03
    Department of Applied Physics, University of Tokyo (Tarucha-Oiwa Lab) Project Researcher

  • 2012/10 - 2013/02
    IARPA Exchange Program (Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen)

  • 2007/04 - 2010/03
    the Japan Society for the Promotion of Science Research Fellow (DC)

  • 2006/10 - 2007/03
    Institute for Solid State Physics, University of Tokyo (Katsumoto Lab) Technical Assistant

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Education 3

  • University of Tokyo (ISSP Katsumoto Lab) Ph.D. course, Department of Physics

    2007/04 - 2010/03

  • University of Tokyo (ISSP Katsumoto Lab) Master course, Department of Physics

    2005/04 - 2007/03

  • University of Tokyo Department of Physics

    2003/04 - 2005/03

Professional Memberships 1

  • THE PHYSICAL SOCIETY OF JAPAN

Research Interests 12

  • Mesoscopic system

  • Semiconductor

  • Quantum computer

  • Quantum bit

  • Spintronics

  • Quantum Device

  • Quantum Wire

  • Quantum Dot

  • Semiconductor Physics

  • Low Temperature Physics

  • Condensed Matter Physics

  • 量子情報処理プロジェクト

Research Areas 3

  • Natural sciences / Semiconductors, optical and atomic physics /

  • Nanotechnology/Materials / Nano/micro-systems /

  • Nanotechnology/Materials / Nanomaterials /

Awards 12

  1. Distinguished Researcher

    2023/04 Tohoku University

  2. Distinguished Researcher

    2020/07 Tohoku University

  3. Intelligent Cosmos Academic Foundation Research Encouraging Award

    2020/05 Intelligent Cosmos Academic Foundation

  4. RIEC Research Exchange Meeting Good Presentation Award

    2018/09 RIEC, Tohoku University

  5. The Young Scientists’ Prize, The Commendation for Science and Technology by the Minister of Education, Culture, Sports, Science and Technology

    2018/04 Minister of Education, Culture, Sports, Science and Technology

  6. Yazaki Memorial Foundation for Science and Technology Research Encouraging Award

    2018/03 Yazaki Memorial Foundation

  7. Foundation Advanced Technology Institute Research Encouraging Award

    2017/05 Foundation Advanced Technology Institute

  8. RIKEN CEMS Award

    2017/04 CEMS, RIKEN

  9. Young Scientist Award of the Physical Society of Japan

    2017/03 the Physical Society of Japan

  10. RIKEN Researcher Incentive Award

    2017/03 RIKEN

  11. NF Foundation R&D Encouragement Award

    2014/11 NF Foundation

  12. Research Encouraging Prize, School of Science, University of Tokyo

    2010/03 School of Science, University of Tokyo

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Papers 76

  1. RFSoC-based radio-frequency reflectometry in gate-defined bilayer graphene quantum devices Peer-reviewed

    Motoya Shinozaki, Tomoya Johmen, Aruto Hosaka, Takumi Seo, Shunsuke Yashima, Akitomi Shirachi, Kosuke Noro, Shoichi Sato, Takashi Kumasaka, Tsuyoshi Yoshida, Tomohiro Otsuka

    Applied Physics Express 18 (7) 075001-1-075001-5 2025/07/09

    DOI: 10.35848/1882-0786/ade6c2  

  2. Charge-state estimation in quantum dots using a Bayesian approach Peer-reviewed

    Motoya Shinozaki, Yui Muto, Takahito Kitada, Tomohiro Otsuka

    Physical Review Applied 23 034078 2025/03/26

    DOI: 10.1103/PhysRevApplied.23.034078  

  3. Lattice-guided growth of dense arrays of aligned transition metal dichalcogenide nanoribbons with high catalytic reactivity Peer-reviewed

    Zongpeng Ma, Pablo Solís-Fernández, Kaito Hirata, Yung-Chang Lin, Keisuke Shinokita, Mina Maruyama, Kota Honda, Tatsuki Kato, Aika Uchida, Hiroto Ogura, Tomohiro Otsuka, Masahiro Hara, Kazunari Matsuda, Kazu Suenaga, Susumu Okada, Toshiaki Kato, Yasufumi Takahashi, Hiroki Ago

    Science Advances 11 (2) eadr8046 2025/01/08

    Publisher: American Association for the Advancement of Science (AAAS)

    DOI: 10.1126/sciadv.adr8046  

    eISSN: 2375-2548

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    Transition metal dichalcogenides (TMDs) exhibit unique properties and potential applications when reduced to one-dimensional (1D) nanoribbons (NRs), owing to quantum confinement and high edge densities. However, effective growth methods for self-aligned TMD NRs are still lacking. We demonstrate a versatile approach for lattice-guided growth of dense, aligned MoS 2 NR arrays via chemical vapor deposition (CVD) on anisotropic sapphire substrates, without tailored surface steps. This method enables the synthesis of NRs with widths below 10 nanometers and longitudinal axis parallel to the zigzag direction, being also extensible to the growth of WS 2 NRs and MoS 2 -WS 2 heteronanoribbons. Growth is influenced by both substrate and CVD temperature, indicating the role of anisotropic precursor diffusion and substrate interaction. The 1D nature of the NRs was asserted by the observation of Coulomb blockade at low temperatures. Pronounced catalytic activity was observed at the edges of the NRs, indicating their promise for efficient catalysis.

  4. Dynamics of quantum cellular automata electron transition in triple quantum dots Peer-reviewed

    Takumi Aizawa, Motoya Shinozaki, Yoshihiro Fujiwara, Takeshi Kumasaka, Wataru Izumida, Arne Ludwig, Andreas D. Wieck, Tomohiro Otsuka

    Physical Review B 110 235421 2024/12/18

    DOI: 10.1103/PhysRevB.110.235421  

  5. Probing electron trapping by current collapse in GaN/AlGaN FETs utilizing quantum transport characteristics Peer-reviewed

    Takaya Abe, Motoya Shinozaki, Kazuma Matsumura, Takumi Aizawa, Takeshi Kumasaka, Norikazu Ito, Taketoshi Tanaka, Ken Nakahara, Tomohiro Otsuka

    Applied Physics Letters 125 253501 2024/12/16

    DOI: 10.1063/5.0232463  

  6. Parity-independent Kondo effect of correlated electrons in electrostatically defined ZnO quantum dots Peer-reviewed

    Kosuke Noro, Yusuke Kozuka, Kazuma Matsumura, Takeshi Kumasaka, Yoshihiro Fujiwara, Atsushi Tsukazaki, Masashi Kawasaki, Tomohiro Otsuka

    Nature Communications 15 9556 2024/11/07

    DOI: 10.1038/s41467-024-53890-2  

    eISSN: 2041-1723

  7. Surface Gate-Defined Quantum Dots in MoS2 with Bi Contacts Peer-reviewed

    Riku Tataka, Alka Sharma, Motoya Shinozaki, Tomoya Johmen, Takeshi Kumasaka, Yong P. Chen, Tomohiro Otsuka

    Journal of the Physical Society of Japan 93 (9) 094601-1-094601-5 2024/09/15

    Publisher: Physical Society of Japan

    DOI: 10.7566/jpsj.93.094601  

    ISSN: 0031-9015

    eISSN: 1347-4073

  8. Microwave-dependent quantum transport characteristics in near pinched-off GaN/AlGaN field-effect transistors Peer-reviewed

    Motoya Shinozaki, Takaya Abe, Kazuma Matsumura, Takumi Aizawa, Takeshi Kumasaka, Tomohiro Otsuka

    Physical Review B 110 035305-1-035305-7 2024/07/17

    Publisher: American Physical Society (APS)

    DOI: 10.1103/physrevb.110.035305  

    ISSN: 2469-9950

    eISSN: 2469-9969

  9. Visual explanations of machine learning model estimating charge states in quantum dots Peer-reviewed

    Yui Muto, Takumi Nakaso, Motoya Shinozaki, Takumi Aizawa, Takahito Kitada, Takashi Nakajima, Matthieu R. Delbecq, Jun Yoneda, Kenta Takeda, Akito Noiri, Arne Ludwig, Andreas D. Wieck, Seigo Tarucha, Atsunori Kanemura, Motoki Shiga, Tomohiro Otsuka

    APL Machine Learning 2 026110-1-026110-7 2024/04/15

    Publisher: AIP Publishing

    DOI: 10.1063/5.0193621  

    eISSN: 2770-9019

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    Charge state recognition in quantum dot devices is important in the preparation of quantum bits for quantum information processing. Toward auto-tuning of larger-scale quantum devices, automatic charge state recognition by machine learning has been demonstrated. For further development of this technology, an understanding of the operation of the machine learning model, which is usually a black box, will be useful. In this study, we analyze the explainability of the machine learning model estimating charge states in quantum dots by gradient weighted class activation mapping. This technique highlights the important regions in the image for predicting the class. The model predicts the state based on the change transition lines, indicating that human-like recognition is realized. We also demonstrate improvements of the model by utilizing feedback from the mapping results. Due to the simplicity of our simulation and pre-processing methods, our approach offers scalability without significant additional simulation costs, demonstrating its suitability for future quantum dot system expansions.

  10. Wide dynamic range charge sensor operation by high-speed feedback control of radio-frequency reflectometry Peer-reviewed

    Yoshihiro Fujiwara, Motoya Shinozaki, Kazuma Matsumura, Kosuke Noro, Riku Tataka, Shoichi Sato, Takeshi Kumasaka, Tomohiro Otsuka

    Applied Physics Letters 123 (21) 213502-1-213502-7 2023/11/20

    Publisher: AIP Publishing

    DOI: 10.1063/5.0167212  

    ISSN: 0003-6951

    eISSN: 1077-3118

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    Semiconductor quantum dots are useful for controlling and observing quantum states and can also be used as sensors for reading out quantum bits and exploring local electronic states in nanostructures. However, challenges remain for the sensor applications, such as the trade-off between sensitivity and dynamic range and the issue of instability due to external disturbances. In this study, we demonstrate proportional-integral-differential feedback control of the radio-frequency reflectometry in GaN nanodevices using a field-programmable gate array. This technique can maintain the operating point of the charge sensor with high sensitivity. The system also realizes a wide dynamic range and high sensor sensitivity through the monitoring of the feedback signal. This method has potential applications in exploring dynamics and instability of electronic and quantum states in nanostructures.

  11. Single PbS colloidal quantum dot transistors Peer-reviewed

    Kenji Shibata, Masaki Yoshida, Kazuhiko Hirakawa, Tomohiro Otsuka, Satria Zulkarnaen Bisri, Yoshihiro Iwasa

    Nature Communications 14 7486-1-7486-8 2023/11/07

    DOI: 10.1038/s41467-023-43343-7  

    eISSN: 2041-1723

  12. Radio-Frequency Reflectometry in Bilayer Graphene Devices Utilizing Microscale Graphite Back-Gates Peer-reviewed

    Tomoya Johmen, Motoya Shinozaki, Yoshihiro Fujiwara, Takumi Aizawa, Tomohiro Otsuka

    Physical Review Applied 20 (1) 2023/07/17

    Publisher: American Physical Society (APS)

    DOI: 10.1103/physrevapplied.20.014035  

    eISSN: 2331-7019

  13. Channel length dependence of the formation of quantum dots in GaN/AlGaN FETs Peer-reviewed

    Kazuma Matsumura, Takaya Abe, Takahito Kitada, Takeshi Kumasaka, Norikazu Ito, Taketoshi Tanaka, Ken Nakahara, Tomohiro Otsuka

    Applied Physics Express 16 (7) 075003-075003 2023/07/01

    Publisher: IOP Publishing

    DOI: 10.35848/1882-0786/ace415  

    ISSN: 1882-0778

    eISSN: 1882-0786

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    Abstract Quantum dots can be formed in simple GaN/AlGaN FETs by disordered potential induced by impurities and defects. Here, we investigate the channel length dependence of the formation of quantum dots. We observe a decrease in the number of formed quantum dots with a decrease in the FET channel length. A few quantum dots are formed in the case with a gate length of 0.05 μm and we evaluate the dot parameters and the disordered potential. We also investigate the effects of a thermal cycle and illumination of light and reveal the change of the disordered potential.

  14. Nonlinear conductance in nanoscale CoFeB/MgO magnetic tunnel junctions with perpendicular easy axis Peer-reviewed

    Motoya Shinozaki, Junta Igarashi, Shuichi Iwakiri, Takahito Kitada, Keisuke Hayakawa, Butsurin Jinnai, Tomohiro Otsuka, Shunsuke Fukami, Kensuke Kobayashi, Hideo Ohno

    Physical Review B 2023/03/30

    DOI: 10.1103/PhysRevB.107.094436  

  15. Scalable fabrication of graphene nanoribbon quantum dot devices with stable orbital-level spacing

    Toshiaki Kato, Takahito Kitada, Mizuki Seo, Wakana Okita, Naofumi Sato, Motoya Shinozaki, Takaya Abe, Takeshi Kumasaka, Takumi Aizawa, Yui Muto, Toshiro Kaneko, Tomohiro Otsuka

    Communications Materials 3 (1) 2022/12/22

    Publisher: Springer Science and Business Media LLC

    DOI: 10.1038/s43246-022-00326-3  

    eISSN: 2662-4443

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    Abstract Large-scale integration of quantum-dot devices is essential for realizing various quantum devices. Graphene-based quantum dots provide a promising platform for spin qubits because of their low nuclear spin density and weak spin-orbit interaction. However, the integration of graphene-based quantum dots remains a challenge. Here, we demonstrate the scalable fabrication of graphene nanoribbon-based quantum-dot devices using a nickel nanobar technique. Fine structures formed in the middle of the nanoribbons exhibit quantum-dot behavior, and more than 56% of devices fabricated on the same substrate show Coulomb diamond features, indicating that large-scale integration of graphene nanoribbon quantum-dot devices is possible with our method. Cryogenic measurements reveal orbital-level spacings between the ground and excited states that are stable up to high-temperature conditions of ~20 K. We explain this stability in terms of the very fine structures formed in the middle of the nanoribbons and their relatively low effective mass.

  16. Probabilistic teleportation of a quantum dot spin qubit Peer-reviewed

    Y. Kojima, T. Nakajima, A. Noiri, J. Yoneda, T. Otsuka, K. Takeda, S. Li, S. D. Bartlett, A. Ludwig, A. D. Wieck, S. Tarucha

    npj Quantum Information 7 (1) 2021/05

    DOI: 10.1038/s41534-021-00403-4  

    eISSN: 2056-6387

  17. Gate voltage dependence of noise distribution in radio-frequency reflectometry in gallium arsenide quantum dots Peer-reviewed

    Motoya Shinozaki, Yui Muto, Takahito Kitada, Takashi Nakajima, Matthieu R. Delbecq, Jun Yoneda, Kenta Takeda, Akito Noiri, Takumi Ito, Arne Ludwig, Andreas D. Wieck, Seigo Tarucha, Tomohiro Otsuka

    Applied Physics Express 14 (3) 2021/02

    DOI: 10.35848/1882-0786/abe41f  

    ISSN: 1882-0778

    eISSN: 1882-0786

  18. Formation of quantum dots in GaN/AlGaN FETs Peer-reviewed

    Tomohiro Otsuka, Takaya Abe, Takahito Kitada, Norikazu Ito, Taketoshi Tanaka, Ken Nakahara

    Scientific Reports 10 (1) 2020/09

    DOI: 10.1038/s41598-020-72269-z  

    eISSN: 2045-2322

  19. Coherence of a Driven Electron Spin Qubit Actively Decoupled from Quasistatic Noise Peer-reviewed

    Takashi Nakajima, Akito Noiri, Kento Kawasaki, Jun Yoneda, Peter Stano, Shinichi Amaha, Tomohiro Otsuka, Kenta Takeda, Matthieu R. Delbecq, Giles Allison, Arne Ludwig, Andreas D. Wieck, Daniel Loss, Seigo Tarucha

    Physical Review X 10 (1) 2020/03

    DOI: 10.1103/PhysRevX.10.011060  

    eISSN: 2160-3308

  20. 量子デバイスの高周波測定技術―半導体量子ドット系における高周波反射測定― Peer-reviewed

    Tomohiro Otsuka

    固体物理 55 69-77 2020/02

  21. Density matrix simulation of quantum error correction codes for near-term quantum devices Peer-reviewed

    Chungheon Baek, Tomohiro Ostuka, Seigo Tarucha, Byung Soo Choi

    Quantum Science and Technology 5 (1) 2020

    DOI: 10.1088/2058-9565/ab5887  

    eISSN: 2058-9565

  22. Quantum non-demolition measurement of an electron spin qubit Peer-reviewed

    Takashi Nakajima, Akito Noiri, Jun Yoneda, Matthieu R. Delbecq, Peter Stano, Tomohiro Otsuka, Kenta Takeda, Shinichi Amaha, Giles Allison, Kento Kawasaki, Arne Ludwig, Andreas D. Wieck, Daniel Loss, Seigo Tarucha

    Nature Nanotechnology 14 (6) 555-560 2019/06

    DOI: 10.1038/s41565-019-0426-x  

    ISSN: 1748-3387

    eISSN: 1748-3395

  23. Spin-orbit assisted spin funnels in DC transport through a physically defined pMOS double quantum dot Peer-reviewed

    Marian Marx, Jun Yoneda, Tomohiro Otsuka, Kenta Takeda, Yu Yamaoka, Takashi Nakajima, Sen Li, Akito Noiri, Tetsuo Kodera, Seigo Tarucha

    Japanese Journal of Applied Physics 58 (SB) SBBI07-1--5 2019/04

    Publisher: IOP Publishing

    DOI: 10.7567/1347-4065/ab01d6  

    ISSN: 0021-4922

    eISSN: 1347-4065

  24. Difference in charge and spin dynamics in a quantum dot-lead coupled system Peer-reviewed

    Tomohiro Otsuka, Takashi Nakajima, Matthieu R. Delbecq, Peter Stano, Shinichi Amaha, Jun Yoneda, Kenta Takeda, Giles Allison, Sen Li, Akito Noiri, Takumi Ito, Daniel Loss, Arne Ludwig, Andreas D. Wieck, Seigo Tarucha

    Physical Review B 99 (8) 085402-1--5 2019/02

    Publisher: American Physical Society (APS)

    DOI: 10.1103/PhysRevB.99.085402  

    ISSN: 2469-9950

    eISSN: 2469-9969

  25. 第34回半導体物理学国際会議(ICPS2018)報告

    Tomohiro Otsuka

    固体物理 54 55-60 2019/01

  26. Coherent transfer of electron spin correlations assisted by dephasing noise Peer-reviewed

    Takashi Nakajima, Matthieu R. Delbecq, Tomohiro Otsuka, Shinichi Amaha, Jun Yoneda, Akito Noiri, Kenta Takeda, Giles Allison, Arne Ludwig, Andreas D. Wieck, Xuedong Hu, Franco Nori, Seigo Tarucha

    Nature Communications 9 (1) 2133-1--8 2018/12/01

    Publisher: Nature Publishing Group

    DOI: 10.1038/s41467-018-04544-7  

    ISSN: 2041-1723

    eISSN: 2041-1723

  27. A fast quantum interface between different spin qubit encodings Peer-reviewed

    A. Noiri, T. Nakajima, J. Yoneda, M. R. Delbecq, P. Stano, T. Otsuka, K. Takeda, S. Amaha, G. Allison, K. Kawasaki, Y. Kojima, A. Ludwig, A. D. Wieck, D. Loss, S. Tarucha

    Nature Communications 9 (1) 5066-1--7 2018/11

    DOI: 10.1038/s41467-018-07522-1  

    eISSN: 2041-1723

  28. Optimized electrical control of a Si/SiGe spin qubit in the presence of an induced frequency shift Peer-reviewed

    Kenta Takeda, Jun Yoneda, Tomohiro Otsuka, Takashi Nakajima, Matthieu R. Delbecq, Giles Allison, Yusuke Hoshi, Noritaka Usami, Kohei M. Itoh, Shunri Oda, Tetsuo Kodera, Seigo Tarucha

    npj Quantum Information 4 54-1--6 2018/10

  29. Four single-spin Rabi oscillations in a quadruple quantum dot Peer-reviewed

    Takumi Ito, Takumi Ito, Tomohiro Otsuka, Tomohiro Otsuka, Tomohiro Otsuka, Tomohiro Otsuka, Takashi Nakajima, Takashi Nakajima, Matthieu R. Delbecq, Matthieu R. Delbecq, Matthieu R. Delbecq, Shinichi Amaha, Jun Yoneda, Jun Yoneda, Kenta Takeda, Kenta Takeda, Akito Noiri, Akito Noiri, Giles Allison, Arne Ludwig, Andreas D. Wieck, Seigo Tarucha, Seigo Tarucha, Seigo Tarucha, Seigo Tarucha

    Applied Physics Letters 113 (9) 093102-1--5 2018/08

    DOI: 10.1063/1.5040280  

    ISSN: 0003-6951

    eISSN: 1077-3118

  30. A quantum-dot spin qubit with coherence limited by charge noise and fidelity higher than 99.9% Peer-reviewed

    Jun Yoneda, Kenta Takeda, Tomohiro Otsuka, Takashi Nakajima, Matthieu R. Delbecq, Giles Allison, Takumu Honda, Tetsuo Kodera, Shunri Oda, Yusuke Hoshi, Noritaka Usami, Kohei M. Itoh, Seigo Tarucha

    Nature Nanotechnology 13 (2) 102-106 2018/02

    Publisher: Springer Science and Business Media LLC

    DOI: 10.1038/s41565-017-0014-x  

    ISSN: 1748-3387

    eISSN: 1748-3395

  31. Cotunneling spin blockade observed in a three-terminal triple quantum dot Peer-reviewed

    A. Noiri, T. Takakura, T. Obata, T. Otsuka, T. Nakajima, J. Yoneda, S. Tarucha

    PHYSICAL REVIEW B 96 (15) 155414-1--7 2017/10

    DOI: 10.1103/PhysRevB.96.155414  

    ISSN: 2469-9950

    eISSN: 2469-9969

  32. Higher-order spin and charge dynamics in a quantum dot-lead hybrid system Peer-reviewed

    Tomohiro Otsuka, Takashi Nakajima, Matthieu R. Delbecq, Shinichi Amaha, Jun Yoneda, Kenta Takeda, Giles Allison, Peter Stano, Akito Noiri, Takumi Ito, Daniel Loss, Arne Ludwig, Andreas D. Wieck, Seigo Tarucha

    SCIENTIFIC REPORTS 7 12201-1--7 2017/09

    DOI: 10.1038/s41598-017-12217-6  

    ISSN: 2045-2322

  33. A triangular triple quantum dot with tunable tunnel couplings Peer-reviewed

    A. Noiri, K. Kawasaki, T. Otsuka, T. Nakajima, J. Yoneda, S. Amaha, M. R. Delbecq, K. Takeda, G. Allison, A. Ludwig, A. D. Wieck, S. Tarucha

    SEMICONDUCTOR SCIENCE AND TECHNOLOGY 32 (8) 084004-1--5 2017/08

    DOI: 10.1088/1361-6641/aa7596  

    ISSN: 0268-1242

    eISSN: 1361-6641

  34. Robust Single-Shot Spin Measurement with 99.5% Fidelity in a Quantum Dot Array Peer-reviewed

    Takashi Nakajima, Matthieu R. Delbecq, Tomohiro Otsuka, Peter Stano, Shinichi Amaha, Jun Yoneda, Akito Noiri, Kento Kawasaki, Kenta Takeda, Giles Allison, Arne Ludwig, Andreas D. Wieck, Daniel Loss, Seigo Tarucha

    PHYSICAL REVIEW LETTERS 119 (1) 017701-1--6 2017/07

    DOI: 10.1103/PhysRevLett.119.017701  

    ISSN: 0031-9007

    eISSN: 1079-7114

  35. Detection and control of charge states in a quintuple quantum dot Peer-reviewed

    Takumi Ito, Tomohiro Otsuka, Shinichi Amaha, Matthieu R. Delbecq, Takashi Nakajima, Jun Yoneda, Kenta Takeda, Giles Allison, Akito Noiri, Kento Kawasaki, Seigo Tarucha

    SCIENTIFIC REPORTS 6 39113-1--7 2016/12

    DOI: 10.1038/srep39113  

    ISSN: 2045-2322

  36. A fault-tolerant addressable spin qubit in a natural silicon quantum dot Peer-reviewed

    Kenta Takeda, Jun Kamioka, Tomohiro Otsuka, Jun Yoneda, Takashi Nakajima, Matthieu R. Delbecq, Shinichi Amaha, Giles Allison, Tetsuo Kodera, Shunri Oda, Seigo Tarucha

    SCIENCE ADVANCES 2 (8) e1600694-1--6 2016/08

    DOI: 10.1126/sciadv.1600694  

    ISSN: 2375-2548

  37. Single-electron Spin Resonance in a Quadruple Quantum Dot Peer-reviewed

    Tomohiro Otsuka, Takashi Nakajima, Matthieu R. Delbecq, Shinichi Amaha, Jun Yoneda, Kenta Takeda, Giles Allison, Takumi Ito, Retsu Sugawara, Akito Noiri, Arne Ludwig, Andreas D. Wieck, Seigo Tarucha

    SCIENTIFIC REPORTS 6 31820-1--6 2016/08

    DOI: 10.1038/srep31820  

    ISSN: 2045-2322

  38. Coherent electron-spin-resonance manipulation of three individual spins in a triple quantum dot Peer-reviewed

    A. Noiri, J. Yoneda, T. Nakajima, T. Otsuka, M. R. Delbecq, K. Takeda, S. Amaha, G. Allison, A. Ludwig, A. D. Wieck, S. Tarucha

    APPLIED PHYSICS LETTERS 108 (15) 153101 2016/04

    DOI: 10.1063/1.4945592  

    ISSN: 0003-6951

    eISSN: 1077-3118

  39. 19pAG-14 Measurement of spin relaxation in quantum dots coupled to electric leads

    Otsuka T., Nakajima T., Delbecq Matthieu, Amaha S., Yoneda J., Takeda K., Allison Giles, Noiri A., Ito T., Ludwig Arne, Wieck Andreas, Tarucha S.

    Meeting Abstracts of the Physical Society of Japan 71 1319-1319 2016

    Publisher: The Physical Society of Japan (JPS)

    DOI: 10.11316/jpsgaiyo.71.1.0_1319  

    ISSN: 2189-079X

  40. 19pAG-12 Transfer of spin states to meta-stable charge configuration in a triple quantum dot

    Nakajima T., Delbecq Matthieu R., Otsuka T., Amaha S., Yoneda J., Noiri A., Takeda K., Allison Giles, Ludwig Arne, Wieck Andreas, Tarucha S.

    Meeting Abstracts of the Physical Society of Japan 71 1317-1317 2016

    Publisher: The Physical Society of Japan (JPS)

    DOI: 10.11316/jpsgaiyo.71.1.0_1317  

    ISSN: 2189-079X

  41. 19pAG-13 Competition between the Inhomogeneous Magnetic Field and the Exchange Interaction in the Electron Spin Resonance in a Triple Quantum Dot

    Yoneda J., Noiri A., Nakajima T., Otsuka T., Delbecq Matthieu, Amaha S., Ludwig Arne, Wieck Andreas, Tarucha S.

    Meeting Abstracts of the Physical Society of Japan 71 1318-1318 2016

    Publisher: The Physical Society of Japan (JPS)

    DOI: 10.11316/jpsgaiyo.71.1.0_1318  

    ISSN: 2189-079X

  42. Single-shot readout of spin states in a triple quantum dot using a metastable charge state

    Nakajima T., Delbecq M. R., Otsuka T., Yoneda J., Noiri A., Kawasaki K., Amaha S., Takeda K., Allison G., Ludwig A., Wieck A. D., Tarucha S.

    Meeting Abstracts of the Physical Society of Japan 71 1158-1158 2016

    Publisher: The Physical Society of Japan

    DOI: 10.11316/jpsgaiyo.71.2.0_1158  

  43. AC Stark effect of a driven spin qubit in a magnetic field gradient

    Takeda K., Kamioka J., Yoneda J., Otsuka T., Delbecq M. R., Allison G., Nakajima T., Kodera T., Oda S., Tarucha S.

    Meeting Abstracts of the Physical Society of Japan 71 1161-1161 2016

    Publisher: The Physical Society of Japan

    DOI: 10.11316/jpsgaiyo.71.2.0_1161  

  44. The property of Rabi oscillations for a single electron spin in a quantum dot

    Noiri A., Yoneda J., Nakajima T., Otsuka T., Delbecq M. R., Takeda K., Amaha S., Allison G., Ludwig A., Wieck A. D., Tarucha S.

    Meeting Abstracts of the Physical Society of Japan 71 1162-1162 2016

    Publisher: The Physical Society of Japan

    DOI: 10.11316/jpsgaiyo.71.2.0_1162  

  45. Quantum Dephasing in a Gated GaAs Triple Quantum Dot due to Nonergodic Noise Peer-reviewed

    M. R. Delbecq, T. Nakajima, P. Stano, T. Otsuka, S. Amaha, J. Yoneda, K. Takeda, G. Allison, A. Ludwig, A. D. Wieck, S. Tarucha

    PHYSICAL REVIEW LETTERS 116 (4) 046802 2016/01

    DOI: 10.1103/PhysRevLett.116.046802  

    ISSN: 0031-9007

    eISSN: 1079-7114

  46. Fast probe of local electronic states in nanostructures utilizing a single-lead quantum dot Peer-reviewed

    Tomohiro Otsuka, Shinichi Amaha, Takashi Nakajima, Matthieu R. Delbecq, Jun Yoneda, Kenta Takeda, Retsu Sugawara, Giles Allison, Arne Ludwig, Andreas D. Wieck, Seigo Tarucha

    SCIENTIFIC REPORTS 5 14616 2015/09

    DOI: 10.1038/srep14616  

    ISSN: 2045-2322

  47. Robust micromagnet design for fast electrical manipulations of single spins in quantum dots Peer-reviewed

    Jun Yoneda, Tomohiro Otsuka, Tatsuki Takakura, Michel Pioro-LadriSre, Roland Brunner, Hong Lu, Takashi Nakajima, Toshiaki Obata, Akito Noiri, Christopher J. Palmstrom, Arthur C. Gossard, Seigo Tarucha

    APPLIED PHYSICS EXPRESS 8 (8) 084401 2015/08

    DOI: 10.7567/APEX.8.084401  

    ISSN: 1882-0778

    eISSN: 1882-0786

  48. 17aAG-12 Charge transport properties of a triangular triple quantum dot

    Kawasaki K., Noiri A., Amaha S., Otsuka T., Nakajima T., Yoneda J., Delbecq M., Tarucha S.

    Meeting Abstracts of the Physical Society of Japan 70 1054-1054 2015

    Publisher: The Physical Society of Japan (JPS)

    DOI: 10.11316/jpsgaiyo.70.2.0_1054  

    ISSN: 2189-079X

  49. 16aAE-5 Fast and addressable single-spin operation in a Si double quantum dot

    Takeda K., Kamioka J., Obata T., Otsuka T., Nakajima T., M. R. Delbecq, Amaha S., Yoneda J., G. Alison, Noiri A., Sugawara R., Kodera T., Oda S., Tarucha S.

    Meeting Abstracts of the Physical Society of Japan 70 1006-1006 2015

    Publisher: The Physical Society of Japan (JPS)

    DOI: 10.11316/jpsgaiyo.70.2.0_1006  

    ISSN: 2189-079X

  50. 16aAE-6 Coherent oscillation of entangled spin states in next-nearest neighbor quantum dots

    Nakajima T., Delbecq M. R., Otsuka T., Amaha S., Yoneda J., Noiri A., Takeda K., Ludwig A., Wieck A. D., Tarucha S.

    Meeting Abstracts of the Physical Society of Japan 70 1007-1007 2015

    Publisher: The Physical Society of Japan (JPS)

    DOI: 10.11316/jpsgaiyo.70.2.0_1007  

    ISSN: 2189-079X

  51. 16aAE-2 Measurement of charge state in multiple quantum dots by multiplexed fast charge sensors

    Ito T., Otsuka T., Amaha S., Nakajima T., Delbecq M., Yoneda J., Takeda K., Allison G., Noiri A., Tarucha S.

    Meeting Abstracts of the Physical Society of Japan 70 1003-1003 2015

    Publisher: The Physical Society of Japan (JPS)

    DOI: 10.11316/jpsgaiyo.70.2.0_1003  

    ISSN: 2189-079X

  52. 16aAE-1 Single-electron spin resonance in a quadruple quantum dot

    Otsuka T., Nakajima T., Delbecq M., Amaha S., Yoneda J., Takeda K., Noiri A., Sugawara R., Allison G., Ludwig A., Wieck A., Tarucha S.

    Meeting Abstracts of the Physical Society of Japan 70 1002-1002 2015

    Publisher: The Physical Society of Japan (JPS)

    DOI: 10.11316/jpsgaiyo.70.2.0_1002  

    ISSN: 2189-079X

  53. 23pBK-2 Realization of a fast single-lead quantum dot probe and evaluation of the properties by probing quantum dot states

    Otsuka T., Amaha S., Nakajima T., Delbecq M., Yoneda J., Takeda K., Sugawara R., Ludwig Arne, Wieck Andreas, Tarucha S.

    Meeting Abstracts of the Physical Society of Japan 70 1369-1369 2015

    Publisher: The Physical Society of Japan (JPS)

    DOI: 10.11316/jpsgaiyo.70.1.0_1369  

    ISSN: 2189-079X

  54. 23pBK-7 Improvement of slanting field ESR method by Alumina insulator layer

    Ito T., Noiri A., Yoneda J., Nakajima T., Otsuka T., Amaha S., Tarucha S.

    Meeting Abstracts of the Physical Society of Japan 70 1374-1374 2015

    Publisher: The Physical Society of Japan (JPS)

    DOI: 10.11316/jpsgaiyo.70.1.0_1374  

    ISSN: 2189-079X

  55. 23pBK-11 Measurement of spin-valley states in a Si double quantum dot using electron spin resonance

    Takeda K., Kamioka J., Obata T., Otsuka T., Nakajima T., Delbecq M. R., Amaha S., Yoneda J., Noiri A., Sugawara R., Kodera T., Oda S., Tarucha S.

    Meeting Abstracts of the Physical Society of Japan 70 1378-1378 2015

    Publisher: The Physical Society of Japan (JPS)

    DOI: 10.11316/jpsgaiyo.70.1.0_1378  

    ISSN: 2189-079X

  56. 23pBK-8 The property of resonance frequencies and Rabi frequencies of 3 spin qubits in a triple quantum dot

    Noiri A., Yoneda J., Nakajima T., Otsuka T., Delbecq Matthieu, Amaha S., Ludwig Arne, Wieck Andreas D., Tarucha S.

    Meeting Abstracts of the Physical Society of Japan 70 1375-1375 2015

    Publisher: The Physical Society of Japan (JPS)

    DOI: 10.11316/jpsgaiyo.70.1.0_1375  

    ISSN: 2189-079X

  57. 23pBK-10 Exploring multiple quantum dots circuits charge stability diagrams

    Delbecq Matthieu, Nakajima Takashi, Otsuka Tomohiro, Amaha Shinichi, Yoneda Jun, Watson John, Manfra Michael, Tarucha Seigo

    Meeting Abstracts of the Physical Society of Japan 70 1377-1377 2015

    Publisher: The Physical Society of Japan (JPS)

    DOI: 10.11316/jpsgaiyo.70.1.0_1377  

    ISSN: 2189-079X

  58. 23pBK-9 Fidelity improvement in spin qubits based on triple quantum dots

    Nakajima T., Delbecq M. R., Otsuka T., Amaha S., Yoneda J., Noiri A., Takeda K., Ludwig Arne, Wieck Andreas D., Tarucha S.

    Meeting Abstracts of the Physical Society of Japan 70 1376-1376 2015

    Publisher: The Physical Society of Japan (JPS)

    DOI: 10.11316/jpsgaiyo.70.1.0_1376  

    ISSN: 2189-079X

  59. Fast Electrical Control of Single Electron Spins in Quantum Dots with Vanishing Influence from Nuclear Spins Peer-reviewed

    J. Yoneda, T. Otsuka, T. Nakajima, T. Takakura, T. Obata, M. Pioro-Ladriere, H. Lu, C. J. Palmstrom, A. C. Gossard, S. Tarucha

    PHYSICAL REVIEW LETTERS 113 (26) 267601 2014/12

    DOI: 10.1103/PhysRevLett.113.267601  

    ISSN: 0031-9007

    eISSN: 1079-7114

  60. Single-spin manipulation in a double quantum dot in the field of a micromagnet Peer-reviewed

    Stefano Chesi, Ying-Dan Wang, Jun Yoneda, Tomohiro Otsuka, Seigo Tarucha, Daniel Loss

    PHYSICAL REVIEW B 90 (23) 235311 2014/12

    DOI: 10.1103/PhysRevB.90.235311  

    ISSN: 1098-0121

    eISSN: 1550-235X

  61. Full control of quadruple quantum dot circuit charge states in the single electron regime Peer-reviewed

    M. R. Delbecq, T. Nakajima, T. Otsuka, S. Amaha, J. D. Watson, M. J. Manfra, S. Tarucha

    APPLIED PHYSICS LETTERS 104 (18) 183111 2014/05

    DOI: 10.1063/1.4875909  

    ISSN: 0003-6951

    eISSN: 1077-3118

  62. Single to quadruple quantum dots with tunable tunnel couplings Peer-reviewed

    T. Takakura, A. Noiri, T. Obata, T. Otsuka, J. Yoneda, K. Yoshida, S. Tarucha

    APPLIED PHYSICS LETTERS 104 (11) 113109 2014/03

    DOI: 10.1063/1.4869108  

    ISSN: 0003-6951

    eISSN: 1077-3118

  63. Measurement of Energy Relaxation in Quantum Hall Edge States Utilizing Quantum Point Contacts Peer-reviewed

    Tomohiro Otsuka, Yuuki Sugihara, Jun Yoneda, Takashi Nakajima, Seigo Tarucha

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 83 (1) 014710 2014/01

    DOI: 10.7566/JPSJ.83.014710  

    ISSN: 0031-9015

  64. Detection of spin polarization utilizing singlet and triplet states in a single-lead quantum dot Peer-reviewed

    Otsuka, Tomohiro, Sugihara, Yuuki, Yoneda, Jun, Katsumoto, Shingo, Tarucha, Seigo

    Physical Review B 86 (8) 081308(R) 2012

    DOI: 10.1103/PhysRevB.86.081308  

  65. Aluminum oxide for an effective gate in Si/SiGe two-dimensional electron gas systems Peer-reviewed

    Yun-Sok Shin, Roland Brunner, Akihiro Shibatomi, Toshiaki Obata, Tomohiro Otsuka, Jun Yoneda, Yasuhiro Shiraki, Kentarou Sawano, Yasuhiro Tokura, Yuichi Harada, Koji Ishibashi, Seigo Tarucha

    SEMICONDUCTOR SCIENCE AND TECHNOLOGY 26 (5) 055004 2011/05

    DOI: 10.1088/0268-1242/26/5/055004  

    ISSN: 0268-1242

    eISSN: 1361-6641

  66. Energy level spectroscopy of a quantum dot with a side-coupled satellite dot Peer-reviewed

    S. W. Kim, Y. Kuwabara, T. Otsuka, Y. Iye, S. Katsumoto

    PHYSICS OF SEMICONDUCTORS: 30TH INTERNATIONAL CONFERENCE ON THE PHYSICS OF SEMICONDUCTORS 1399 393-394 2011

    DOI: 10.1063/1.3666419  

    ISSN: 0094-243X

  67. Detection of spin polarization in a quantum wire Peer-reviewed

    Otsuka, Tomohiro, Abe, Eisuke, Iye, Yasuhiro, Katsumoto, Shingo

    Physica E-Low-Dimensional Systems & Nanostructures 42 (4) 809-812 2010

    DOI: 10.1016/j.physe.2009.10.034  

    ISSN: 1386-9477

  68. Probing local electronic states in the quantum Hall regime with a side-coupled quantum dot Peer-reviewed

    Otsuka, Tomohiro, Abe, Eisuke, Iye, Yasuhiro, Katsumoto, Shingo

    Physical Review B 81 (24) 245302 2010

    DOI: 10.1103/PhysRevB.81.245302  

  69. Detection of spin polarization with a side-coupled quantum dot Peer-reviewed

    Otsuka, Tomohiro, Abe, Eisuke, Iye, Yasuhiro, Katsumoto, Shingo

    Physical Review B 79 (19) 195313 2009

    DOI: 10.1103/PhysRevB.79.195313  

  70. Control of shell filling with Coulomb interaction in quantum dots side-coupled to quantum wires Peer-reviewed

    Tomohiro Otsuka, Eisuke Abe, Yasuhiro Iye, Shingo Katsumoto

    PHYSICA STATUS SOLIDI C - CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 5, NO 9 5 (9) 2873-2875 2008

    ISSN: 1610-1634

  71. Potential dependent intra-dot Coulomb interaction in quantum dots side-coupled to quantum wires Peer-reviewed

    Otsuka, Tomohiro, Abe, Eisuke, Iye, Yasuhiro, Katsumoto, Shingo

    Physica E-Low-Dimensional Systems & Nanostructures 40 (5) 1270-1272 2008

    DOI: 10.1016/j.physe.2007.08.048  

    ISSN: 1386-9477

  72. Control of shell filling with Coulomb interaction in quantum dots side-coupled to quantum wires Peer-reviewed

    Otsuka, Tomohiro, Abe, Eisuke, Iye, Yasuhiro, Katsumoto, Shingo

    Physica Status Solidi C - Current Topics in Solid State Physics, Vol 5, No 9 5 2873-2875 2008

    DOI: 10.1002/pssc.200779183  

    ISSN: 1862-6351

  73. Excited-state spectroscopy on a quantum dot side coupled to a quantum wire Peer-reviewed

    Otsuka, T., Abe, E., Iye, Y., Katsumoto, S.

    Applied Physics Letters 93 (11) 112111 2008

    DOI: 10.1063/1.2987424  

  74. Phase information from two-terminal conductance of quantum dot systems Peer-reviewed

    Otsuka, Tomohiro, Aikawa, Hisashi, Eto, Mikio, Khym, Gyong L., Kang, Kicheon, Iye, Yasuhiro, Katsumoto, Shingo

    Physics of Semiconductors, Pts a and B 893 855-856 2007

    DOI: 10.1063/1.2730160  

    ISSN: 0094-243X

  75. Fano effect in a few-electron quantum dot Peer-reviewed

    Otsuka, Tomohiro, Abe, Eisuke, Katsumoto, Shingo, Iye, Yasuhiro, Khym, Gyong L., Kang, Kicheon

    Journal of the Physical Society of Japan 76 (8) 084706 2007

    DOI: 10.1143/JPSJ.76.084706  

  76. Breakdown of phase rigidity and variations of the Fano effect in closed Aharonov-Bohm interferometers Peer-reviewed

    Aharony, A, Entin-Wohlman, O, Otsuka, T, Katsumoto, S, Aikawa, H, Kobayashi, K

    Physical Review B 73 (19) 195329 2006

    DOI: 10.1103/PhysRevB.73.195329  

Show all ︎Show first 5

Misc. 49

  1. Visual explanations of the machine learning model to recognize the charge states in quantum dots

    武藤由依, 中曽拓, 相澤拓海, 篠崎基矢, 北田孝仁, 中島峻, DELBECQ Matthieu R., 米田淳, 武田健太, 野入亮人, LUDWIG Arne, WIECK Andreas D., 樽茶清悟, 兼村厚範, 志賀元紀, 大塚朋廣

    日本物理学会講演概要集(CD-ROM) 78 (1) 2023

    ISSN: 2189-079X

  2. Improving generalization ability of automatic charge-state estimation in quantum dots by machine learning

    武藤由依, 中曽拓, 相澤拓海, 篠崎基矢, 北田孝仁, 中島峻, DELBECQ Matthieu R., 米田淳, 武田健太, 野入亮人, LUDWIG Arne, WIECK Andreas D., 樽茶清悟, 兼村厚範, 志賀元紀, 大塚朋廣

    日本物理学会講演概要集(CD-ROM) 78 (2) 2023

    ISSN: 2189-079X

  3. Noise-robust charge state recognition in quantum dots using machine learning and preprocessing

    武藤由依, 中曽拓, 相澤拓海, 篠崎基矢, 北田孝仁, 中島峻, DELBECQ Matthieu R., 米田淳, 武田健太, 野入亮人, LUDWIG Arne, WIECK Andreas D., 樽茶清悟, 兼村厚範, 大塚朋廣

    日本物理学会講演概要集(CD-ROM) 77 (1) 2022

    ISSN: 2189-079X

  4. Real-time measurement of QCA charge state transition in quantum dots by rf-reflectometry

    相澤拓海, 篠崎基矢, 藤原義弘, 熊坂武志, 中島峻, DELBECQ Matthieu R., 米田淳, 武田健太, 野入亮人, LUDWIG Arne, WIECK Andreas D., 樽茶清悟, 大塚朋廣

    日本物理学会講演概要集(CD-ROM) 77 (1) 2022

    ISSN: 2189-079X

  5. Noise analysis of high-frequency measurements in quantum dots

    篠崎基矢, 武藤由依, 北田孝仁, 中島峻, DELBECQ Matthieu R., 米田淳, 武田健太, 野入亮人, 伊藤匠, LUDWIG Arne, WIECK Andreas D., 樽茶清悟, 大塚朋廣

    日本物理学会講演概要集(CD-ROM) 75 (2) 2020

    ISSN: 2189-079X

  6. Noise dependence of the charge state estimation in quantum dots by Bayesian estimation

    武藤由依, 篠崎基矢, 北田孝仁, 永安修也, 中島峻, DELBECQ Matthieu R., 米田淳, 武田健太, 野入亮人, LI Sen, 伊藤匠, 樽茶清悟, 大塚朋廣

    日本物理学会講演概要集(CD-ROM) 75 (2) 2020

    ISSN: 2189-079X

  7. Charge state estimation of quantum dots by machine learning

    中曽拓, 篠崎基矢, 相澤拓海, 北田孝仁, 武藤由依, 中島峻, DELBECQ Matthieu R., 米田淳, 武田健太, 野入亮人, 伊藤匠, LUDWIG Arne, WIECK Andreas D., 樽茶清悟, 兼村厚範, 大塚朋廣

    日本物理学会講演概要集(CD-ROM) 75 (2) 2020

    ISSN: 2189-079X

  8. 電子スピンの量子テレポーテーションに向けた実験

    小嶋洋平, 小嶋洋平, 中島峻, 野入亮人, 米田淳, 大塚朋廣, 大塚朋廣, 武田健太, LI Sen, BARTLETT Stephen D., LUDWIG Arne, WIECK Andreas D., 樽茶清悟, 樽茶清悟

    日本物理学会講演概要集(CD-ROM) 74 (1) 2019

    ISSN: 2189-079X

  9. 微小磁石ESRに用いる局所磁場パラメータの解析

    伊藤匠, 大塚朋廣, 中島峻, DELBECQ Matthieu, 天羽真一, 米田淳, 武田健太, 野入亮人, ALLISON Giles, LUDWIG Arne, WIECK Andreas, 樽茶清悟

    日本物理学会講演概要集(CD-ROM) 74 (1) 2019

    ISSN: 2189-079X

  10. フィードバック制御による電子スピン量子ビットの操作忠実度の向上

    野入亮人, 中島峻, 川崎賢人, 米田淳, STANO Peter, 天羽真一, 大塚朋廣, 武田健太, DELBECQ Matthieu R., ALLISON Giles, LUDWIG Arne, WIECK Andreas D., LOSS Daniel, LOSS Daniel, 樽茶清悟, 樽茶清悟

    日本物理学会講演概要集(CD-ROM) 74 (1) 2019

    ISSN: 2189-079X

  11. 4重量子ドットにおける4電子スピン状態測定法の開発

    伊藤匠, 大塚朋廣, 中島峻, DELBECQ Matthieu, 天羽真一, 米田淳, 武田健太, 野入亮人, ALLISON Giles, LUDWIG Arne, WIECK Andreas D., 樽茶清悟

    日本物理学会講演概要集(CD-ROM) 74 (2) 2019

    ISSN: 2189-079X

  12. シリコン量子ドットにおける2スピン同時検出

    米田淳, 武田健太, 野入亮人, 中島峻, 大塚朋廣, LI Sen, 小寺哲夫, 樽茶清悟

    日本物理学会講演概要集(CD-ROM) 73 (1) 2018

    ISSN: 2189-079X

  13. 電子スピンの量子テレポーテーションに向けた実験スキーム

    小嶋洋平, 小嶋洋平, 中島峻, 野入亮人, 米田淳, 大塚朋廣, 武田健太, 伊藤匠, 伊藤匠, BARTLETT Stephen D., LUDWIG Arne, WIECK Andreas D., 樽茶清悟, 樽茶清悟

    日本物理学会講演概要集(CD-ROM) 73 (1) 2018

    ISSN: 2189-079X

  14. ベイズ推定を用いた量子ドット電荷計の信号解析

    大塚朋廣, 永安修也, 中島峻, DELBECQ Matthieu R., 米田淳, 武田健太, 野入亮人, LI Sen, 伊藤匠, 樽茶清悟

    日本物理学会講演概要集(CD-ROM) 73 (1) 2018

    ISSN: 2189-079X

  15. 異種スピン量子ビット間の制御位相ゲート

    野入亮人, 中島峻, 米田淳, DELBECQ Matthieu R., STANO Peter, 大塚朋廣, 武田健太, 天羽真一, ALLISON Giles, 川崎賢人, LUDWIG Arne, WIECK Andreas D., LOSS Daniel, LOSS Daniel, 樽茶清悟, 樽茶清悟

    日本物理学会講演概要集(CD-ROM) 73 (1) 2018

    ISSN: 2189-079X

  16. 同位体制御Si/SiGe単一電子スピンの1/f電荷揺らぎによる位相雑音

    米田淳, 武田健太, 大塚朋廣, 中島峻, DELBECQ Matthieu R, ALLISON Giles, 本田拓夢, 小寺哲夫, 小田俊理, 星裕介, 宇佐美徳隆, 伊藤公平, 樽茶清悟

    日本物理学会講演概要集(CD-ROM) 72 (2) ROMBUNNO.21pB31‐4 2017/09/25

    ISSN: 2189-079X

  17. 同位体制御Si/SiGe電子スピン量子ビットの高速量子操作忠実度

    米田淳, 武田健太, 大塚朋廣, 中島峻, DELBECQ Matthieu R, ALLISON Giles, 本田拓夢, 小寺哲夫, 小田俊理, 星裕介, 宇佐美徳隆, 伊藤公平, 樽茶清悟

    日本物理学会講演概要集(CD-ROM) 72 (1) ROMBUNNO.17pA21‐7 2017/03/21

    ISSN: 2189-079X

  18. 異種スピン量子ビット間の制御NOTゲート II

    中島峻, 野入亮人, 米田淳, 大塚朋廣, 武田健太, DELBECQ Matthieu R., 川崎賢人, ALLISON Giles, LUDWIG Arne, WIECK Andreas D., 樽茶清悟, 樽茶清悟

    日本物理学会講演概要集(CD-ROM) 72 (1) 2017

    ISSN: 2189-079X

  19. 異種スピン量子ビット間の制御NOTゲート I

    野入亮人, 中島峻, 米田淳, 大塚朋廣, 武田健太, DELBECQ Matthieu R., 川崎賢人, ALLISON Giles, LUDWIG Arne, WIECK Andreas D., 樽茶清悟, 樽茶清悟

    日本物理学会講演概要集(CD-ROM) 72 (1) 2017

    ISSN: 2189-079X

  20. フィードバック制御による電子スピン位相緩和の抑制 II

    野入亮人, 川崎賢人, 中島峻, 米田淳, STANO P., 大塚朋廣, 武田健太, DELBECQ Matthieu R., ALLISON Giles, LUDWIG Arne, WIECK Andreas D., LOSS D., 樽茶清悟, 樽茶清悟

    日本物理学会講演概要集(CD-ROM) 72 (2) 2017

    ISSN: 2189-079X

  21. フィードバック制御による電子スピン位相緩和の抑制 I

    中島峻, 川崎賢人, 野入亮人, 米田淳, STANO P., 大塚朋廣, 武田健太, DELBECQ Matthieu R., ALLISON Giles, LUDWIG Arne, WIECK Andreas D., LOSS D., 樽茶清悟, 樽茶清悟

    日本物理学会講演概要集(CD-ROM) 72 (2) 2017

    ISSN: 2189-079X

  22. 4重量子ドットにおける4スピンの独立なRabi振動の観測

    伊藤匠, 大塚朋廣, 中島峻, DELBECQ Matthieu, 天羽真一, 米田淳, 武田健太, 野入亮人, ALLISON Giles, LUDWIG Arne, WIECK Andreas D., 樽茶清悟

    日本物理学会講演概要集(CD-ROM) 72 (1) 2017

    ISSN: 2189-079X

  23. 量子ドット-電極結合系における電荷・スピンダイナミクス

    大塚朋廣, 中島峻, DELBECQ Matthieu R., STANO Peter, 天羽真一, 米田淳, 武田健太, ALLISON Giles, 野入亮人, 伊藤匠, LOSS Daniel, LUDWIG Arne, WIECK Andreas D., 樽茶清悟

    日本物理学会講演概要集(CD-ROM) 72 (2) 2017

    ISSN: 2189-079X

  24. 同位体制御されたSi/SiGe量子ドットにおける単一電子スピン共鳴

    米田淳, 武田健太, 大塚朋廣, 中島峻, DELBECQ Matthieu R, ALLISON Giles, 本田拓夢, 小寺哲夫, 小田俊理, 星裕介, 宇佐美徳隆, 伊藤公平, 樽茶清悟

    日本物理学会講演概要集(CD-ROM) 71 (2) ROMBUNNO.15aAB‐11 2016/09/23

    ISSN: 2189-079X

  25. Si/SiGe多重量子ドットの形成と電荷状態測定

    大塚朋廣, 武田健太, 米田淳, 本田拓夢, DELBECQ Matthieu, ALLISON Giles, MARX Marian, 中島峻, 小寺哲夫, 小田俊理, 星裕介, 宇佐美徳隆, 伊藤公平, 樽茶清悟

    日本物理学会講演概要集(CD-ROM) 71 (2) ROMBUNNO.15aAB‐10 2016/09/23

    ISSN: 2189-079X

  26. 領域4「III-V族半導体によるトポロジカル絶縁体の実現〜InAs/GaSb量子スピンホール系のエッジ伝導〜」(企画講演,第70回年次大会(2015年)招待・企画・チュートリアル講演の報告,学会報告)

    大塚 朋廣

    日本物理學會誌 70 (8) 638-638 2015/08/05

    Publisher: 一般社団法人日本物理学会

    ISSN: 0029-0181

  27. 電極閉じ込め型シリコンMOS量子ドットの作製と評価

    米田淳, 本田拓夢, 武田健太, MARX Marian, 大塚朋廣, 中島峻, DELBECQ Matthieu, 天羽真一, ALLISON Giles, 小寺哲夫, 小田俊理, 樽茶清悟

    日本物理学会講演概要集(CD-ROM) 70 (2) 2015

    ISSN: 2189-079X

  28. 8pAV-4 Experimental Study of Spin Qubits in Triple Quantum Dot II

    Nakajima Takashi, Otsuka Tomohiro, Delbecq Matthieu, Amaha Shinichi, Yoneda Jun, Noiri Akito, Takeda Kenta, Sugawara Retsu, Tarucha Seigo

    Meeting abstracts of the Physical Society of Japan 69 (2) 478-478 2014/08/22

    Publisher: The Physical Society of Japan (JPS)

    ISSN: 1342-8349

  29. 8pAV-3 Experimental Study of Spin Qubits in Triple Quantum Dot I

    Otsuka T., Nakajima T., Delbecq M., Amaha S., Yoneda J., Noiri A., Takeda K., Sugawara R., Tarucha S.

    Meeting abstracts of the Physical Society of Japan 69 (2) 478-478 2014/08/22

    Publisher: The Physical Society of Japan (JPS)

    ISSN: 1342-8349

  30. 8pAV-5 Electrically driven single-electron spin resonance in a Si/SiGe double quantum dot with a micromagnet

    Takeda K., Kamioka J., Obata T., Otsuka T., Nakajima T., Delbecq M., Amaha S., Yoneda J., Noiri A., Sugawara R., Kodera T., Oda S., Tarucha S.

    Meeting abstracts of the Physical Society of Japan 69 (2) 478-478 2014/08/22

    Publisher: The Physical Society of Japan (JPS)

    ISSN: 1342-8349

  31. 三重量子ドットを用いたスピン・キュービット実験 I

    大塚朋廣, 中島峻, DELBECQ M., 天羽真一, 米田淳, 野入亮人, 武田健太, 菅原烈, 樽茶清悟

    日本物理学会講演概要集 69 (2) 2014

    ISSN: 1342-8349

  32. Pauli spin blockade in a three-terminal triple quantum dot

    Noiri A., Takakura T., Obata T., Otsuka T., Nakajima T., Yoneda J., Tarucha S.

    Meeting abstracts of the Physical Society of Japan 68 (2) 634-634 2013/08/26

    Publisher: The Physical Society of Japan (JPS)

    ISSN: 1342-8349

  33. Phase Gates Of A Single Electron Spin Qubit

    Yoneda J., Otsuka T., Nakajima T., Takakura T., Obata T., Tarucha S.

    Meeting abstracts of the Physical Society of Japan 68 (2) 635-635 2013/08/26

    Publisher: The Physical Society of Japan (JPS)

    ISSN: 1342-8349

  34. Probing energy relaxation in quantum Hall edge states utilizing quantum point contacts

    Otsuka T., Sugihara Y., Yoneda J., Nakajima T., Tarucha S.

    Meeting abstracts of the Physical Society of Japan 68 (2) 611-611 2013/08/26

    Publisher: The Physical Society of Japan (JPS)

    ISSN: 1342-8349

  35. 29aXQ-4 Time-resolved Measurement of Fast Rabi Oscillation of Single-electron Spin Rresonance

    Yoneda J., Otsuka T., Nakajima T., Takakura T., Obata T., Tarucha S.

    Meeting abstracts of the Physical Society of Japan 68 (1) 784-784 2013/03/26

    Publisher: The Physical Society of Japan (JPS)

    ISSN: 1342-8349

  36. 29aXQ-11 Quadruple Quantum Dot with Tunable Interdot Tunnel Couplings

    Noiri A., Takakura T., Obata T., Otsuka T., Yoneda J., Yoshida K., Tarucha S.

    Meeting abstracts of the Physical Society of Japan 68 (1) 786-786 2013/03/26

    Publisher: The Physical Society of Japan (JPS)

    ISSN: 1342-8349

  37. 26aXQ-6 Gate-Bias Dependence of Conductance Fluctuations in GaAs Quantum Point Contacts

    Nakajima Takashi, Otsuka Tomohiro, Yoneda Jun, Noiri Akito, Tarucha Seigo

    Meeting abstracts of the Physical Society of Japan 68 (1) 743-743 2013/03/26

    Publisher: The Physical Society of Japan (JPS)

    ISSN: 1342-8349

  38. 26pCE-8 Electron spin resonance in a double quantum dot with large Zeeman field difference

    Yoneda J., Otsuka T., Takakura T., Obata T., Tarucha S.

    Meeting abstracts of the Physical Society of Japan 67 (1) 744-744 2012/03/05

    Publisher: The Physical Society of Japan (JPS)

    ISSN: 1342-8349

  39. 26pCE-7 Detection of spin polarization utilizing two-electron states in a single-lead quantum dot

    Otsuka T., Sugihara Y., Yoneda J., Obata T., Katsumoto S., Tarucha S.

    Meeting abstracts of the Physical Society of Japan 67 (1) 744-744 2012/03/05

    Publisher: The Physical Society of Japan (JPS)

    ISSN: 1342-8349

  40. 24aTR-6 Control of local Zeeman energy difference between neighboring quantum dots by micro-magnet design

    Yoneda J., Otsuka T., Takakura T., Obata T., Tarucha S.

    Meeting abstracts of the Physical Society of Japan 66 (2) 705-705 2011/08/24

    Publisher: The Physical Society of Japan (JPS)

    ISSN: 1342-8349

  41. 28pHD-2 Energy Level Spectroscopy of a Quantum Dot with a Side-coupled Satellite Dot

    Kuwabara Yuki, Kim Sunwoo, Otsuka Tomohiro, Iye Yasuhiro, Katsumoto Shingo

    Meeting abstracts of the Physical Society of Japan 66 (1) 729-729 2011/03/03

    Publisher: The Physical Society of Japan (JPS)

    ISSN: 1342-8349

  42. 28aHD-3 Double-quantum-dot devices with a large difference in local magnetic field for fast spin manipulation

    Yoneda J., Otsuka T., Takakura T., Obata T., Tarucha S.

    Meeting abstracts of the Physical Society of Japan 66 (1) 724-724 2011/03/03

    Publisher: The Physical Society of Japan (JPS)

    ISSN: 1342-8349

  43. 26aXG-11 Probing quantum Hall states with a side coupled quantum dot

    Otsuka T., Abe E., Iye Y., Katsumoto S.

    Meeting abstracts of the Physical Society of Japan 64 (2) 595-595 2009/08/18

    Publisher: The Physical Society of Japan (JPS)

    ISSN: 1342-8349

  44. 30pTX-6 Detection of Spin Polarization with a Side Coupled Quantum Dot

    Otsuka T., Abe E., Iye Y., Katsumoto S.

    Meeting abstracts of the Physical Society of Japan 64 (1) 714-714 2009/03/03

    Publisher: The Physical Society of Japan (JPS)

    ISSN: 1342-8349

  45. 20pYF-4 Excited-State Spectroscopy on a Side-Coupled Quantum Dot

    Otsuka T., Abe E., Iye Y., Katsumoto S.

    Meeting Abstracts of the Physical Society of Japan 63 (0) 593-593 2008

    Publisher: The Physical Society of Japan

    DOI: 10.11316/jpsgaiyo.63.2.4.0_593_3  

    ISSN: 1342-8349

  46. 24aTH-8 Coulomb Interaction in a Side-Coupled Quantum Dot

    Otsuka T., Abe E., Katsumoto S., Iye Y.

    Meeting abstracts of the Physical Society of Japan 62 (2) 713-713 2007/08/21

    Publisher: The Physical Society of Japan (JPS)

    ISSN: 1342-8349

  47. 20pRC-12 Non-Local Control of the Kondo Effect

    Otsuka T., Katsumoto S., Iye Y.

    Meeting abstracts of the Physical Society of Japan 62 (1) 685-685 2007/02/28

    Publisher: The Physical Society of Japan (JPS)

    ISSN: 1342-8349

  48. 29pXB-1 On Breaking of "Phase Rigidity" in Transport through a Two-Terminal AB Ring

    Katsumoto Shingo, Ohtsuka Tomohiro, Aharony Amnon, Entin-Wohlman Ora

    Meeting abstracts of the Physical Society of Japan 61 (1) 695-695 2006/03/04

    Publisher: The Physical Society of Japan (JPS)

    ISSN: 1342-8349

  49. 29pXB-2 Quantum transport through a quantum wire with a side-coupled quantum dot

    Otsuka T., Katsumoto S., Iye Y., Khym G.L., Kang Kicheon

    Meeting abstracts of the Physical Society of Japan 61 (1) 695-695 2006/03/04

    Publisher: The Physical Society of Japan (JPS)

    ISSN: 1342-8349

Show all ︎Show first 5

Presentations 217

  1. Devices utilizing new materials for semiconductor quantum technologies Invited

    Tomohiro Otsuka

    International VLSI Symposium on Technology, Systems and Applications 2025/04/23

  2. 酸化亜鉛少数電子二重量子ドットの形成

    野呂康介, 篠﨑基矢, 小塚裕介, 松村和真, 藤原義弘, 熊坂武志, 塚﨑敦, 川﨑雅司, 大塚朋廣

    日本物理学会 2025/03/21

  3. 機械学習による量子ドットの単一電子領域検出とバーチャルゲート定義の自動化

    武藤由依, Michael R. Zielewski, 篠﨑基矢, 野呂康介, 大塚朋廣

    日本物理学会 2025/03/21

  4. New materials and techniques for semiconductor spin-based quantum technologies Invited

    Tomohiro Otsuka

    Impurity Spins for Quantum Information Science and Technologies 2024/12/04

  5. Semiconductor quantum devices based on new materials Invited

    Tomohiro Otsuka

    3rd International Workshop of Spin/Quantum Materials and Devices & 6th Workshop on Quantum and Classical Cryogenic Devices, Circuits, and Systems 2024/11/06

  6. Exploring Quantum Devices with New Materials Invited

    Tomohiro Otsuka

    Quantum Innovation 2024 2024/10/23

  7. RFSoCを用いた半導体量子デバイス高周波反射測定系の構築

    篠﨑基矢, 上面友也, 保坂有杜, 瀬尾拓未, 八島俊介, 白地昭豊鏡, 野呂康介, 佐藤彰一, 熊坂武志, 吉田剛, 大塚朋廣

    日本物理学会 2024/09/18

  8. 低温可変共振回路に向けたSrTiO3可変容量コンデンサ特性の面方位・ドープ依存性

    白地昭豊鏡, 篠崎基矢, 富岡泰秀, 小塚裕介, 佐藤彰一, 熊坂武志, 大塚朋廣

    日本物理学会 2024/09/18

  9. 原子間力顕微鏡による宙づりグラフェンの局所陽極酸化

    田中奎伍, 柿添勇成, 松井朋裕, 大塚朋廣, 原正大

    日本物理学会 2024/09/16

  10. スピン量子ビットを用いた電子波束の単発測定手法の開発

    Yunseong Jang, Han, Ngoc Tu, 藤田高史, 大塚朋廣, Arne Ludwig, Andreas D. Wieck, 山本倫久, Christopher Bäuerle, 新見康洋, 高田真太郎

    日本物理学会 2024/09/16

  11. New material-based approaches in quantum devices Invited

    Tomohiro Otsuka

    International Conference on Solid State Devices and Materials 2024/09/02

  12. Formation of quantum dots in ZnO heterostructures and observation of Kondo Effect

    Kosuke Noro, Yusuke Kozuka, Kazuma Matsumura, Takeshi Kumasaka, Yoshihiro Fujiwara, Atsushi Tsukazaki, Masashi Kawasaki, Tomohiro Otsuka

    International Conference on the Physics of Semiconductors 2024 2024/08/01

  13. Classifying the Charge State of Quantum Dots by Machine Learning and Improving the Performance by Visual Explanations of the Model

    Yui Muto, Takumi Nakaso, Motoya Shinozaki, Takumi Aizawa, Takahito Kitada, Takashi Nakajima, Matthieu R. Delbecq, Jun Yoneda, Kenta Takeda, Akito Noiri, Arne Ludwig, Andreas D. Wieck, Seigo Tarucha, Atsunori Kanemura, Motoki Shiga, Tomohiro Otsuka

    International Conference on the Physics of Semiconductors 2024 2024/07/30

  14. 単一ペロブスカイト量子ドットの電気伝導特性

    高橋央輔, 大塚朋廣, 柴田 憲治

    2024年第71回 応用物理学会春季学術講演会 2024/03/24

  15. 進行波型超伝導増幅器の集積性向上に向けた高誘電率基板上窒化ニオブ薄膜のマイクロ波特性評価

    沓間弘樹, 森俊祐, 小塚裕介, 大塚朋廣, 松浦康平, 山下太郎

    2024年第71回 応用物理学会春季学術講演会 2024/03/22

  16. GaN FETにおけるマイクロ波共鳴ピークの解析

    松村和真, 阿部峰也, 篠崎基矢, 相澤拓海, 熊坂武志, 大塚朋廣

    日本物理学会2024春季大会 2024/03/21

  17. 半導体量子デバイスの放射線に対する応答の研究

    高草元, 岸本康宏, 吉田斉, 大塚朋廣

    日本物理学会2024年春季大会 2024/03/21

  18. Semiconductor Qubits and New Materials Invited

    Tomohiro Otsuka

    UK-Japan-Swiss Workshop ‘Materials for Quantum Electronics 2024/02/28

  19. Improvement of Charge State Estimation in Quantum Dots by Machine Learning and Visualization of the Model by Grad-CAM

    Yui Muto, Takumi Nakaso, Takumi Aizawa, Motoya Shinozaki, Takahito Kitada, Takashi Nakajima, Matthieu R. Delbecq, Jun Yoneda, Kenta Takeda, Akito Noiri, Arne Ludwig, Andreas D. Wieck, Seigo Tarucha, Atsunori Kanemura, Motoki Shiga, Tomohiro Otsuka

    The 5th International Symposium on AI and Electronics 2024/02/20

  20. Wide dynamic range charge sensing utilizing fast feedback control of radio-frequency reflectometry

    Motoya Shinozaki, Yoshihiro Fujiwara, Kazuma Matsumura, Kosuke Noro, Riku Tataka, Shoichi Sato, Takeshi Kumasaka, Tomohiro Otsuka

    Symposium for the Core Research Clusters for Materials Science and Spintronics, and International Joint Graduate Program in Materials Science and Spintronics 2023/11/28

  21. Improving the generalization performance of the machine learning model estimating charge states in quantum dots

    Yui Muto, Takumi Nakaso, Takumi Aizawa, Motoya Shinozaki, Takahito Kitada, Takashi Nakajima, Matthieu R. Delbecq, Jun Yoneda, Kenta Takeda, Akito Noiri, Arne Ludwig, Andreas D. Wieck, Seigo Tarucha, Atsunori Kanemura, Motoki Shiga, Tomohiro Otsuka

    Symposium for the Core Research Clusters for Materials Science and Spintronics, and International Joint Graduate Program in Materials Science and Spintronics, 2023/11/28

  22. Transport Property of a Few Quantum Dots Formed in Short Channel GaN FETs

    Kazuma Matsumura, Takaya Abe, Takahito Kitada, Takeshi Kumasaka, Norikazu Ito, Taketoshi Tanaka, Ken Nakahara, Tomohiro Otsuka

    Symposium for the Core Research Clusters for Materials Science and Spintronics, and International Joint Graduate Program in Materials Science and Spintronics 2023/11/28

  23. Controllable fabrication of graphene nanoribbon-based quantum dot devices

    Tatsuki Kato, Mizuki Seo, Takahito Kitada, Tomohiro Otsuka, Toshiaki Kato

    Symposium for the Core Research Clusters for Materials Science and Spintronics, and International Joint Graduate Program in Materials Science and Spintronics 2023/11/28

  24. High-frequency measurement in graphene nanostructures for quantum devices

    Tomoya Johmen, Motoya Shinozaki, Yoshihiro Fujiwara, Takumi Aizawa, Tomohiro Otsuka

    Workshop on Quantum and Classical Cryogenic Devices, Circuits, and Systems, Superconducting SFQ VLSI Workshop, and International Workshop of Spin/Quantum Materials and Devices, 2023/11/17

  25. Automatic state recognition of quantum dot hardware utilizing machine learning

    Yui Muto, Takumi Nakaso, Takumi Aizawa, Motoya Shinozaki, Takahito Kitada, Takashi Nakajima, Matthieu R. Delbecq, Jun Yoneda, Kenta Takeda, Akito Noiri, Arne Ludwig, Andreas D. Wieck, Seigo Tarucha, Atsunori Kanemura, Motoki Shiga, Tomohiro Otsuka

    International Conference on Machine Learning Physics 2023/11/15

  26. 単一コロイドPbS量子ドットトランジスタの電気伝導特性

    柴田 憲治, 吉田政希, 平川一彦, 大塚朋廣, Bisri Satria, 岩佐義宏

    応用物理学会 2023/09/21

  27. 単一PbS量子ドットトランジスタの電気伝導特性

    柴田 憲治, 吉田政希, 平川一彦, 大塚朋廣, Bisri Satria, 岩佐義宏

    日本物理学会 2023/09/17

  28. 短チャネルGaN FETにおける少数量子ドットの形成

    松村和真, 阿部峰也, 北田孝仁, 熊坂武志, 伊藤範和, 田中岳利, 中原健, 大塚朋廣

    日本物理学会 2023/09/17

  29. 機械学習による量子ドット電荷状態推定の汎化性能改良

    武藤由依, 中曽拓, 相澤拓海, 篠﨑基矢, 北田孝仁, 中島峻, Matthieu R. Delbecq, 米田淳, 武田健太, 野入亮人, Arne Ludwig, Andreas D. Wieck, 樽茶清悟, 兼村厚範, 志賀元紀, 大塚朋廣

    日本物理学会 2023/09/17

  30. 高周波反射測定の高速PID制御による電荷センサのダイナミックレンジ改善

    篠﨑基矢, 藤原義弘, 松村和真, 野呂康介, 田髙陸, 佐藤彰一, 熊坂武志, 大塚朋廣

    日本物理学会 2023/09/17

  31. Radio-frequency reflectometry measurement in bilayer graphene microdevices

    Tomoya Johmen, Motoya Shinozaki, Yoshihiro Fujiwara, Riku Tataka, Takumi Aizawa, Takeshi Kumasaka, Tomohiro Otsuka

    International Conference on Electronic Properties of Two-Dimensional Systems 2023/06/11

  32. Automatic charge state estimation in quantum dots by machine learning and visual explanation of the model with Grad-CAM

    Yui Muto, Takumi Nakaso, Takumi Aizawa, Motoya Shinozaki, Takahito Kitada, Takashi Nakajima, Matthieu R. Delbecq, Jun Yoneda, Kenta Takeda, Akito Noiri, Arne Ludwig, Andreas D. Wieck, Seigo Tarucha, Atsunori Kanemura, Motoki Shiga, Tomohiro Otsuka

    International Conference on Electronic Properties of Two-Dimensional Systems 2023/06/11

  33. Gate-tunable carrier transport through single PbS colloidal quantum dots

    Kenji Shibata, Msasaki Yoshida, Kazuhiko Hirakawa, Tomohiro, Otsuka, Satria, Z. Bisri, Yoshihiro Iwasa

    International Conference on Electronic Properties of Two-Dimensional Systems 2023/06/11

  34. Semiconductor spin qubits and new materials Invited

    Tomohiro Otsuka

    Workshop: Emerging Platforms for Quantum Computing 2023/04/10

  35. 量子ドット電荷状態推定機械学習モデルの予測判断根拠可視化

    武藤由依, 中曽拓, 相澤拓海, 篠﨑基矢, 北田孝仁, 中島峻, Matthieu R. Delbecq, 米田淳, 武田健太, 野入亮人, Arne Ludwig, Andreas D. Wieck, 樽茶清悟, 兼村厚範, 志賀元紀, 大塚朋廣

    日本物理学会 2023/03/24

  36. ナノギャップ電極と結合した単一PbS量子ドットの電気伝導特性

    吉田政希, 阿部真弓, 平川一彦, 大塚朋廣, Bisri Satria, 岩佐義宏, 柴田 憲治

    応用物理学会 2023/03/18

  37. Quantum dots in new materials for quantum devices Invited

    Tomohiro Otsuka

    International Workshop of Spin/Quantum Materials and Devices, 2023/02/24

  38. Formation of quantum dots in MoS2 utilizing intrinsic Schottky barriers

    Riku Tataka, Alka Sharma, Tomoya Johmen, Motoya Shinozaki, Takeshi Kumasaka, Yong P. Chen, Tomohiro Otsuka

    Symposium for The Core Research Clusters for Materials Science and Spintronics, and International Joint Graduate Program in Materials Science 2022/10/25

  39. High-frequency measurement in bilayer graphene nanodevices

    Tomoya Johmen, Motoya Shinozaki, Yoshihiro Fujiwara, Riku Tataka, Takumi Aizawa, Takeshi Kumasaka, Tomohiro Otsuka

    Symposium for The Core Research Clusters for Materials Science and Spintronics, and International Joint Graduate Program in Materials Science, 2022/10/25

  40. Kondo Effects in ZnO Quantum Dots

    Kosuke Noro, Takeshi Kumasaka, Yoshihiro Fujiwara, Yusuke Kozuka, Atsushi Tsukazaki, Masashi Kawasaki, Tomohiro Otsuka

    Symposium for The Core Research Clusters for Materials Science and Spintronics, and International Joint Graduate Program in Materials Science, 2022/10/25

  41. Charge state recognition in double quantum dot devices by machine learning

    Yui Muto, Takumi Nakaso, Takumi Aizawa, Motoya Shinozaki, Takahito Kitada, Takashi Nakajima, Matthieu R. Delbecq, Jun Yoneda, Kenta Takeda, Akito Noiri, Arne Ludwig, Andreas D. Wieck, Seigo Tarucha, Atsunori Kanemura, Tomohiro Otsuka

    Yui Muto, Takumi Nakaso, Takumi Aizawa, Motoya Shinozaki, Takahito Kitada, Takashi Nakajima, Matthieu R. Delbecq, Jun Yoneda, Kenta Takeda, Akito Noiri, Arne Ludwig, Andreas D. Wieck, Seigo Tarucha, Atsunori Kanemura and Tomohiro Otsuka, 2022/10/25

  42. 二層グラフェン微小デバイスにおける高周波反射測定

    上面友也, 篠崎基矢, 熊坂武志, 藤原義弘, 田高陸, 相澤拓海, 大塚朋廣

    日本物理学会 2022/09/13

  43. MoS2におけるコンタクト,ゲート電極の開発と量子ドット形成

    田髙陸, Alka Sharma, 上面友也, 篠崎基矢, 熊坂武志, Yong P. Che, 大塚朋廣

    日本物理学会 2022/09/13

  44. 酸化亜鉛量子ドットの形成と近藤効果の観測

    野呂康介, 熊坂武志, 藤原義弘, 小塚裕介, 塚﨑敦, 川﨑雅司, 大塚朋廣

    日本物理学会 2022/09/13

  45. Noise robust recognition of charge states in quantum dots by machine learning and preprocessing

    Yui Muto, Takumi Nakaso, Takumi Aizawa, Motoya Shinozaki, Takahito Kitada, Takashi Nakajima, Matthieu R. Delbecq, Jun Yoneda, Kenta Takeda, Akito Noiri, Arne Ludwig, Andreas D. Wieck, Seigo Tarucha, Atsunori Kanemura, Tomohiro Otsuka

    International Conference on the Physics of Semiconductors 2022 2022/06/28

  46. ナノギャップ電極と結合したPbS量子ドットにおける電気伝導特性

    柴田憲治, 齋藤光貴, 大塚 朋廣

    応用物理学会 2022/03/23

  47. 半導体量子ビット研究の最前線シンポジウム はじめに

    大塚朋廣

    日本物理学会 2022/03/18

  48. 高周波反射測定による量子ドットQCA状態電荷遷移の実時間観測

    相澤拓海, 篠﨑基矢, 藤原義弘, 熊坂武, 中島峻, Matthieu R. Delbecq, 米田淳, 武田健太, 野入亮人, Arne Ludwig, Andreas D. Wieck, 樽茶清悟, 大塚朋廣

    日本物理学会 2022/03/16

  49. GaN FETの電流コラプス下における量子ドット形成

    阿部峰也, 篠崎基矢, 相澤拓海, 熊坂武志, 伊藤範和, 田中岳利, 中原健, 大塚朋廣

    日本物理学会 2022/03/16

  50. 機械学習と前処理によるノイズ耐性のある量子ドット電荷状態推定

    武藤由依, 中曽拓, 相澤拓海, 篠﨑基矢, 北田孝仁, 中島峻, Matthieu R. Delbecq, 米田淳, 武田健太, 野入亮人, Arne Ludwig, Andreas D. Wieck, 樽茶清悟, 兼村厚範, 大塚朋廣

    日本物理学会 2022/03/16

  51. 量子ポイントコンタクトの放射線応答

    湯田秀明, 吉田斉, 大塚朋廣, 岸本康宏

    日本物理学会 2022/03/16

  52. 微細CoFeB/MgO磁気トンネル接合における非線形電子輸送特性

    篠﨑基矢, 五十嵐純太, 岩切秀一, 北田孝仁, 早川佳祐, 陣内佛霖, 大塚朋廣, 深見俊輔

    日本物理学会 2022/03/15

  53. Noise analysis of radio-frequency reflectometry for single spin and charge detection in quantum dots Invited

    Tomohiro Otsuka, Motoya Shinozaki, Yui Muto, Takahito Kitada, Takashi Nakajima, Matthieu R. Delbecq, Jun Yoneda, Kenta Takeda, Akito Noiri, Takumi Ito, Arne Ludwig, Andreas D. Wieck, Seigo Tarucha

    1st Online RIEC International Workshop on Spintronics 2021/11/18

  54. Quantum dots formed in GaN/AlGaN FETs and channel length dependence

    Takaya Abe, Takahito Kitada, Norikazu Ito, Taketoshi Tanaka, Ken Nakahara, Tomohiro Otsuka

    International Conference on Electronic Properties of Two-Dimensional Systems 2021/11/02

  55. Channel length dependence of the formation of quantum dots in GaN FETs

    Takaya Abe, Takahito Kitada, Norikazu Ito, Taketoshi Tanaka, Ken Nakahara, Tomohiro Otsuka

    Symposium for The Core Research Clusters for Materials Science and Spintronics, and International Joint Graduate Program in Materials Science 2021/10/27

  56. Error rate analysis of charge sensing in quantum dots by Bayesian approach

    Motoya Shinozaki, Yui Muto, Takahito Kitada, Shuya Nagayasu, Takeshi Nakajima, Matthieu R. Delbecq, Jun Yoneda, Kenta Takeda, Akito Noiri, Sen Li, Takumi Ito, Seigo Tarucha, Tomohiro Otsuka

    Symposium for The Core Research Clusters for Materials Science and Spintronics, and International Joint Graduate Program in Materials Science 2021/10/27

  57. Improving low temperature contact resistance of 2D semiconductors using semimetal

    Alka Sharma, Tomohiro Otsuka, Yong P. Chen

    Symposium for The Core Research Clusters for Materials Science and Spintronics, and International Joint Graduate Program in Materials Science 2021/10/25

  58. GaN FETにおけるマイクロ波依存伝導の観測

    阿部峰也, 篠崎基矢, 相澤拓海, 熊坂武志, 伊藤範和, 田中岳利, 中原健, 大塚朋廣

    日本物理学会 2021/09/21

  59. 電荷検出器への応用に向けた金属ナノ接合の微細化と伝導特性制御

    柴田 憲治, 佐々木 尚人, 斉藤 大我, 大塚 朋廣, 平川 一彦

    応用物理学会 2021/03/16

  60. CVDグラフェンナノリボンにおける単一量子ドット形成

    北田孝仁, 阿部峰也, 瀬尾瑞樹, 佐藤尚郁, 篠﨑基矢, 相澤拓海, 武藤由依, 金子俊郎, 加藤俊顕, 大塚朋廣

    日本物理学会 2021/03/15

  61. GaN FET中量子ドット形成のチャネル長依存性

    阿部峰也, 北田孝仁, 伊藤範和, 田中岳利, 中原健, 大塚朋廣

    日本物理学会 2021/03/13

  62. 半導体量子ドットを用いた電子スピン状態の測定と制御 Invited

    大塚朋廣

    日本物理学会 2021/03/12

  63. Readout noise in radio-frequency reflectometry in gallium arsenide quantum dots

    Motoya Shinozaki, Yui Muto, Takahito Kitada, Takashi Nakajima, Matthieu R. Delbecq, Jun Yoneda, Kenta Takeda, Akito Noiri, Takumi Ito, Arne Ludwig, Andreas D. Wieck, Seigo Tarucha, Tomohiro Otsuka

    International Symposium for The Core Research Clusters for Materials Science and Spintronics 2021/02/24

  64. Charge state estimation in quantum dots by Bayesian approach

    Yui Muto, Motoya Shinozaki, Takahito Kitada, Shuya Nagayasu, Takashi Nakajima, Matthieu R. Delbecq, Jun Yoneda, Kenta Takeda, Akito Noiri, Sen Li, Takumi Ito, Seigo Tarucha, Tomohiro Otsuka

    International Symposium for The Core Research Clusters for Materials Science and Spintronics 2021/02/24

  65. Quantum Dots in plasma CVD Graphene Nanoribbons

    Takahito Kitada, Mizuki Seo, Takaya Abe, Motoya Shinozaki, Naohumi Sato, Takumi Aizawa, Yui Muto, Toshiro Kaneko, Toshiaki Kato, Tomohiro Otsuka

    International Symposium for The Core Research Clusters for Materials Science and Spintronics 2021/02/24

  66. CVDグラフェンナノリボンにおける量子ドット形成

    北田孝仁, 阿部峰也, 篠﨑基矢, 瀬尾瑞樹, 金子俊郎, 加藤俊顕, 大塚朋廣

    日本物理学会 2020/09/11

  67. 機械学習による量子ドットの電荷状態推定

    中曽拓, 篠﨑基矢, 相澤拓海, 北田孝仁, 武藤由依, 中島峻, Matthieu R. Delbecq, 米田淳, 武田健, 野入亮人, 伊藤匠, Arne Ludwig, Andreas D. Wieck, 樽茶清悟, 兼村厚範, 大塚朋廣

    日本物理学会 2020/09/09

  68. 量子ドット高周波反射測定のノイズ解析

    篠﨑基矢, 武藤由依, 北田孝仁, 中島峻, Matthieu R. Delbecq, 米田淳, 武田健太, 野入亮人, 伊藤匠, Arne Ludwig, Andreas D. Wieck, 樽茶清悟, 大塚朋廣

    日本物理学会 2020/09/09

  69. ベイズ手法による量子ドット電荷状態推定のノイズ依存性

    武藤由依, 篠﨑基矢, 北田孝仁, 永安修也, 中島峻, Matthieu R. Delbecq, 米田淳, 武田健太, 野入亮人, Sen Li, 伊藤匠, 樽茶清悟, 大塚朋廣

    日本物理学会 2020/09/09

  70. 半導体微細構造を用いた量子デバイス Invited

    大塚朋廣

    東京大学物性研究所ワークショップ 「ナノスケール物性科学の最先端と新展開」 2020/07/22

  71. CVDグラフェンナノリボンの電気伝導特性測定

    北田孝仁, 阿部峰也, 瀬尾瑞樹, 金子俊郎, 加藤俊顕, 大塚朋廣

    日本物理学会 2020/04/01

  72. GaN FET中量子ドット形成の絶縁膜依存性

    阿部峰也, 北田孝仁, 伊藤範和, 田中岳利, 中原健, 大塚朋廣

    日本物理学会 2020/04/01

  73. Measurement and Control of Single-electron Spins by Utilizing Semiconductor Quantum Dot Invited

    Tomohiro Otsuka, Takashi Nakajima, Matthieu R. Delbecq, Peter Stano, Shinichi Amaha, Jun Yoneda, Kenta Takeda, Giles Allison, Sen Li, Akito Noiri, Takumi Ito, Daniel Loss, Arne Ludwig, Andreas D. Wieck, Seigo Tarucha

    Symposium for The Core Research Clusters for Materials Science and Spintronics 2020/02/10

  74. Quantum dots formed in GaN FETs

    Takaya Abe, Takahito Kitada, Norikazu Ito, Taketoshi Tanaka, Ken Nakahara, Tomohiro Otsuka

    Symposium for The Core Research Clusters for Materials Science and Spintronics 2020/02/10

  75. Spin and Charge Dynamics in Nanostructures Probed by Quantum Dot Sensors

    Tomohiro Otsuka, Takashi Nakajima, Matthieu R. Delbecq, Peter Stano, Shinichi Amaha, Jun Yoneda, Kenta Takeda, Giles Allison, Sen Li, Akito Noiri, Takumi Ito, Daniel Loss, Arne Ludwig, Andreas D. Wieck, Seigo Tarucha

    New Perspective in Spin Conversion Science 2020/02/03

  76. Spin Dynamics in Nanostructures Probed by Quantum Dot Sensors

    Tomohiro Otsuka, Takashi Nakajima, Matthieu R. Delbecq, Peter Stano, Shinichi Amaha, Jun Yoneda, Kenta Takeda, Giles Allison, Sen Li, Akito Noiri, Takumi Ito, Daniel Loss, Arne Ludwig, Andreas D. Wieck, Seigo Tarucha

    Materials Research Meeting 2019 2019/12/11

  77. Speed up of quantum dot sensors utilizing Bayesian estimation

    Tomohiro Otsuka, Shuya Nagayasu, Takashi Nakajima, Matthieu R. Delbecq, Jun Yoneda, Kenta Takeda, Akito Noiri, Sen Li, Takumi Ito, Seigo Tarucha

    International Symposium on Materials Informatics 2019/02/10

  78. Probing Spin Dynamics in Nanostructures Utilizing Quantum Dot Sensors

    Tomohiro Otsuka, Takashi Nakajima, Matthieu R. Delbecq, Peter Stano, Shinichi Amaha, Jun Yoneda, Kenta Takeda, Giles Allison, Sen Li, Akito Noiri, Takumi Ito, Daniel Loss, Arne Ludwig, Andreas D. Wieck, Seigo Tarucha

    2018/11/22

  79. Charge and Spin Dynamics in a Quantum Dot-Lead Hybrid System Invited

    Tomohiro Otsuka, Takashi Nakajima, Matthieu R. Delbecq, Peter Stano, Shinichi Amaha, Jun Yoneda, Kenta Takeda, Giles Allison, Sen Li, Akito Noiri, Takumi Ito, Daniel Loss, Arne Ludwig, Andreas D. Wieck, Seigo Tarucha

    International Symposium on Frontiers of Quantum Transport in Nano Science 2018/11/09

  80. Speed up of quantum dot charge sensing utilizing Bayesian estimation International-presentation

    Tomohiro Otsuka, Shuya Nagayasu, Takashi Nakajima, Matthieu R. Delbecq, Jun Yoneda, Kenta Takeda, Akito Noiri, Sen Li, Takumi Ito, Seigo Tarucha

    International Conference on the Physics of Semiconductors 2018/07/30

  81. Different charge and spin dynamics in a quantum dot-lead coupled system International-presentation

    Tomohiro Otsuka, Takashi Nakajima, Matthieu R. Delbecq, Peter Stano, Shinichi Amaha, Jun Yoneda, Kenta Takeda, Giles Allison, Akito Noiri, Takumi Ito, Daniel Loss, Arne Ludwig, Andreas D. Wieck, Seigo Tarucha

    International Symposium on Dynamics in Artificial Quantum Systems 2018/01/15

  82. Probing Dynamics of Local Electronic States in Nanostructures Utilizing Fast Quantum Dot Probes International-presentation

    Tomohiro Otsuka, Takashi Nakajima, Matthieu R. Delbecq, Shinichi Amaha, Jun Yoneda, Kenta Takeda, Giles Allison, Peter Stano, Akito Noiri, Takumi Ito, Daniel Loss, Arne Ludwig, Andreas D. Wieck, Seigo Tarucha

    International Symposium on Fluctuation and Structure out of Equilibrium 2017/11/21

  83. Four Single-spin Rabi Oscillations in a Quadruple Quantum Dot International-presentation

    Takumi Ito, Tomohiro Otsuka, Takashi Nakajima, Matthieu R. Delbecq, Shinichi Amaha, Jun Yoneda, Kenta Takeda, Akito Noiri, Giles Allison, Arne Ludwig, Andreas D. Wieck, Seigo Tarucha

    International Conference on Electronic Properties of Two Dimensional Systems 2017/08/03

  84. Difference in Charge and Spin Dynamics in a Quantum Dot-Lead Hybrid System International-presentation

    Tomohiro Otsuka, Takashi Nakajima, Matthieu R. Delbecq, Peter Stano, Shinichi Amaha, Jun Yoneda, Kenta Takeda, Giles Allison, Akito Noiri, Takumi Ito, Daniel Loss, Arne Ludwig, Andreas D. Wieck, Seigo Tarucha

    International Conference on Electronic Properties of Two Dimensional Systems 2017/08/01

  85. Fast Local Electronic Probes utilizing Quantum Dots for Fluctuation Measurement in Nanodevices

    Tomohiro Otsuka, Shinichi Amaha, Takashi Nakajima, Matthieu R. Delbecq, Jun Yoneda, Kenta Takeda, Retsu Sugawara, Arne Ludwig, Andreas D. Wieck, Seigo Tarucha

    新学術領域「ゆらぎと構造」第3回領域研究会 2016/06/17

  86. AC Stark effect and optimal control of a strongly driven Si/SiGe quantum dot spin qubit International-presentation

    K. Takeda, J. Kamioka, J. Yoneda, T. Otsuka, M. R. Delbecq, G. Allison, T. Nakajima, T. Kodera, S. Oda, S. Tarucha

    Silicon Quantum Electronics Workshop 2016/06

  87. Multiplexed reflectometry measurement of a gate-defined Si-MOS quantum dot International-presentation

    J. Yoneda, T. Honda, K. Takeda, M. Marx, T. Otsuka, T. Nakajima, M. R. Delbecq, S. Amaha, G. Allison, T. Kodera, S. Oda, S. Tarucha

    Silicon Quantum Electronics Workshop 2016/06

  88. Measurement of charge states in Si/SiGe multiple quantum dots International-presentation

    T. Otsuka, K. Takeda, J. Yoneda, T. Honda, M. R. Delbecq, G. Allison, M. Marx, T. Nakajima, T. Kodera, S. Oda, Y. Hoshi, N. Usami, K. M. Itoh, S. Tarucha

    Silicon Quantum Electronics Workshop 2016/06

  89. Measurement of spin relaxation in semiconductor quantum dots coupled to electric leads

    Tomohiro Otsuka, Takashi Nakajima, Matthieu R. Delbecq, Shinichi Amaha, Jun Yoneda, Kenta Takeda, Giles Allison, Akito Noiri, Takumi Ito, Arne Ludwig, Andreas D. Wieck, Seigo Tarucha

    ImPACT量子情報技術ワークショップ 2016/03/29

  90. Hybrid cQED architecture as a model system for non-equilibrium physics in condensed matter

    Matthieu R. Delbecq, Giles Allison, Takashi Nakajima, Jun Yoneda, Kenta Takeda, Marian Marx, Tomohiro Otsuka, Shinich Amaha, Seigo Tarucha

    ImPACT量子情報技術ワークショップ 2016/03/29

  91. 三重量子ドットにおける準安定電荷状態を利用したスピン・電荷変換

    中島峻, Matthieu R. Delbecq, 大塚朋廣, 天羽真一, 米田淳, 野入亮人, 武田健太, Giles Allison、Arne Ludwig, Andreas D. Wieck, 樽茶清悟

    日本物理学会 2016/03/19

  92. 三重量子ドット電子スピン共鳴における局所磁場差と交換相互作用の競合

    米田淳, 野入亮人, 中島峻, 大塚朋廣, M. Delbecq, 天羽真一, Arne Ludwig, Andreas D. Wieck, 樽茶清悟

    日本物理学会 2016/03/19

  93. 電極と結合した量子ドットにおけるスピン緩和測定

    大塚朋廣, 中島峻, Matthieu R. Delbecq, 天羽真一, 米田淳, 武田健太, Giles Allison, 野入亮人, 伊藤匠, Arne Ludwig, Andreas D. Wieck, 樽茶清悟

    日本物理学会 2016/03/19

  94. Measurement of charge states in multiple quantum dots utilizing multiplexed fast charge sensors

    Takumi Ito, Tomohiro Otsuka, Shinichi Amaha, Matthieu R. Delbecq, Jun Yoneda, Kenta Takeda, Akito Noiri, Takashi Nakajima, Seigo Tarucha

    東京大学低温センター研究交流会 2016/02/23

  95. Coherent electron-spin-resonance control of three individual spins in a triple quantum dot International-presentation

    A. Noiri, J. Yoneda, T. Nakajima, T. Otsuka, M. R. Delbecq, K. Takeda, S. Amaha, G. Allison, A. Ludwig, A. D. Wieck, S. Tarucha

    International Symposium on Dynamics in Artificial Quantum Systems 2016/01/14

  96. Hybrid cQED architecture as a model system for non-equilibrium physics in condensed matter International-presentation

    G. Allison, M. R. Delbecq, N. Lambert, T. Nakajima, J. Yoneda, K. Takeda, M. Marx, T. Otsuka, S. Amaha, F. Nori, S. Tarucha

    International Symposium on Dynamics in Artificial Quantum Systems 2016/01/13

  97. Bayesian estimation of nuclear-spin bath for adaptive feedback with a single-electron spin qubit International-presentation

    K. Kawasaki, T. Nakajima, J. Yoneda, M. R. Delbecq, S. Amaha, T. Otsuka, K. Takeda, S. Tarucha

    International Symposium on Dynamics in Artificial Quantum Systems 2016/01/13

  98. Controlling entanglement of spin qubits in a triple quantum dot International-presentation

    T. Nakajima, M. R. Delbecq, T. Otsuka, S. Amaha, J. Yoneda, A. Noiri, K. Takeda, G. Allison, A. Ludwig, A. D. Wieck, S. Tarucha

    International Symposium on Dynamics in Artificial Quantum Systems 2016/01/13

  99. Electron spin resonance in a quadruple quantum dot International-presentation

    T. Otsuka, T. Nakajima, M. R. Delbecq, S. Amaha, J. Yoneda, K. Takeda, A. Noiri, R. Sugawara, A. Ludwig, A. D. Wieck, S. Tarucha

    International Symposium on Dynamics in Artificial Quantum Systems 2016/01/13

  100. A fast addressable spin qubit in a silicon quantum dot International-presentation

    K. Takeda, J. Kamioka, T. Otsuka, J. Yoneda, T. Nakajima, M. R. Delbecq, S. Amaha, G. Allison, A. Noiri, R. Sugawara, T. Kodera, S. Oda, S. Tarucha

    International Symposium on Dynamics in Artificial Quantum Systems 2016/01/13

  101. Exploiting the slow dynamics of nuclear spins to enhance the coherence time of spin qubits in GaAs International-presentation

    M. R. Delbecq, T. Nakajima, P. Stano, T. Otsuka, S. Amaha, J. Yoneda, K. Takeda, G. Allison, A. Ludwig, A. D. Wieck, S. Tarucha

    International Symposium on Nanoscale Transport and Technology 2015/11/20

  102. Generation of locally and non-locally entangled electron spin pairs in a triple quantum dot International-presentation Invited

    T. Nakajima, M. R. Delbecq, T. Otsuka, S. Amaha, J. Yoneda, A. Noiri, K. Takeda, A. Ludwig, A. D. Wieck, S. Tarucha

    International Workshop : Quantum Nanostructures and Electron-Nuclear Spin Interactions 2015/10/20

  103. 半導体量子ドットを用いたスピンキュービット実験 Invited

    大塚朋廣, 中島峻, M. Delbecq, 天羽真一, 米田淳, 武田健太, 野入亮人, 菅原烈, 伊藤匠, 川崎賢人, H. Lu, B, Shojaei、C. Palmstrom、A. Gossard, J. Watson, M. Manfra、A. Ludwig, A. Wieck, 樽茶清悟

    第4回関西若手物性研究会 2015/10/17

  104. 三角形型三重量子ドットの電荷輸送特性

    川崎賢人, 野入亮人, 天羽真一, 大塚朋廣, 中島峻, 米田淳, M. Delbecq, 武田健太, 樽茶清悟

    日本物理学会 2015/09/17

  105. 四重量子ドットにおける単一電子スピン共鳴

    大塚朋廣, 中島峻, Matthieu Delbecq, 天羽真一, 米田淳, 武田健太, 野入亮人, 菅原烈, Giles Allison、Arne Ludwig, Andreas Wieck, 樽茶清悟

    日本物理学会 2015/09/16

  106. 高速複数電荷計を用いた多重量子ドット電荷状態の観測

    伊藤匠, 大塚朋廣, 天羽真一, 中島峻, Matthieu Delbecq, 米田淳, 武田健太, Giles Allison, 野入亮人, 樽茶清悟

    日本物理学会 2015/09/16

  107. 電極閉じ込め型シリコンMOS量子ドットの作製と評価

    米田淳, 本田拓夢, 武田健太, Marian Marx, 大塚朋廣, 中島峻, Matthieu Delbecq, 天羽真一, Giles Allison, 小寺哲夫, 小田俊理, 樽茶清悟

    日本物理学会 2015/09/16

  108. Si2重量子ドット中の電子スピンの高速独立操作

    武田健太, 神岡純, 小幡利顕, 大塚朋廣, 中島峻, Matthieu Delbecq, 天羽真一, 米田淳, Giles Alison, 野入亮人, 菅原烈, 小寺哲夫, 小田俊理, 樽茶清悟

    日本物理学会 2015/09/16

  109. 三重量子ドットにおける非隣接スピンもつれ状態の形成と観測

    中島峻, Matthieu R. Delbecq, 大塚朋廣, 天羽真一, 米田淳, 野入亮人, 武田健太, Arne Ludwig, Andreas D. Wieck, 樽茶清悟

    日本物理学会 2015/09/16

  110. Coherence of spin qubits measured faster than the decorrelation time of their environmental noise

    Matthieu R. Delbecq, Takashi Nakajima, Tomohiro Otsuka, Shinichi Amaha, Jun Yoneda, Akito Noiri, Arne Ludwig, Andreas D. Wieck, Seigo Tarucha

    半導体量子効果と量子情報の夏期研修会 2015/09/11

  111. A fast addressable single-spin qubit in a Si/SiGe double quantum dot with a micromagnet

    Kenta Takeda, Jun Kamioka, Toshiaki Obata, Tomohiro Otsuka, Takashi Nakajima, Matthieu R. Delbecq, Shinichi Amaha, Jun Yoneda, Giles Allison, Akito Noiri, Retsu Sugawara, Tetsuo Kodera, Syunri Oda, Seigo Tarucha

    半導体量子効果と量子情報の夏期研修会 2015/09/11

  112. A tunnel-coupled triangular triple quantum dot

    Akito Noiri, Kento Kawasaki, Shinichi Amaha, Tomohiro Otsuka, Takashi Nakajima, Jun Yoneda, Matthieu R. Delbecq, Kenta Takeda, Seigo Tarucha

    半導体量子効果と量子情報の夏期研修会 2015/09/11

  113. cQED incorporating SiGe quantum dots

    Giles Allison, Matthieu R. Delbecq, Takashi Nakajima, Jun Yoneda, Kenta Takeda, Marian Marx, Tomohiro Otsuka, Shinich Amaha, Seigo Tarucha

    半導体量子効果と量子情報の夏期研修会 2015/09/11

  114. Electrical characterization of silicon metel-oxide-semiconductor-based quantum dots

    Jun Yoneda, Takumu Honda, Kenta Takeda, Marian Marx, Tomohiro Otsuka, Takashi Nakajima, Matthieu R. Delbecq, Shinichi Amaha, Giles Allison, Tetsuo Kodera, Syunri Oda, Seigo Tarucha

    半導体量子効果と量子情報の夏期研修会 2015/09/11

  115. Enhancement of coherent time of a spin qubit by fast feedback in nuclear spin bath fluctuation

    Kento Kawasaki, Takashi Nakajima, Jun Yoneda, Matthieu R. Delbecq, Shinichi Amaha, Tomohiro Otsuka, Kenta Takeda, Seigo Tarutya

    半導体量子効果と量子情報の夏期研修会 2015/09/11

  116. Increasing valley-splitting in Si/SiGe quantum dots

    Marian Marx, Jun Yoneda, Giles Allison, Matthieu R. Delbecq, Takumu Honda, Tomohiro Otsuka, Kenta Takeda, Shinichi Amaha, Takashi Nakajima, Retsu Sugawara, Seigo Tarucha

    半導体量子効果と量子情報の夏期研修会 2015/09/11

  117. Probing spin states in a triple quantum dot by Fourier transform spectroscopy International-presentation

    T. Nakajima, M. R. Delbecq, T. Otsuka, S. Amaha, J. Yoneda, A. Noiri, K. Takeda, A. Ludwig, A. D. Wieck, S. Tarucha

    SpinTech VIII 2015/08/12

  118. A strongly driven single-spin qubit in a Si/SiGe double quantum dot with a micro-magnet International-presentation

    K. Takeda, J. Kamioka, T. Obata, T. Otsuka, T. Nakajima, M. R. Delbecq, S. Amaha, J. Yoneda, A. Noiri, R. Sugawara, T. Kodera, S. Oda, S. Tarucha

    SpinTech VIII 2015/08/12

  119. Implementation of three spin qubits in a lateral triple quantum dot International-presentation

    A. Noiri, T. Nakajima, J. Yoneda, M. R. Delbecq, T. Otsuka, S. Amaha, K. Takeda, A. Ludwig, A. D. Wieck, S. Tarucha

    SpinTech VIII 2015/08/11

  120. A fast addressable single-spin qubit in a Si/SiGe double quantum dot with a micro-magnet International-presentation

    K. Takeda, J. Kamioka, T. Obata, T. Otsuka, T. Nakajima, M. R. Delbecq, S. Amaha, J. Yoneda, G. Allison, A. Noiri, R. Sugawara, T. Kodera, S. Oda, S. Tarucha

    Silicon Quantum Electronics Workshop 2015 2015/08/04

  121. Improved design and fabrication for Si/SiGe quantum dots with increased valley-splitting International-presentation

    M. Marx, K. Takeda, J. Yoneda, G. Allison, T. Honda, M. R. Delbecq, T. Otsuka, T. Nakajima, S. Amaha, T. Kodera, S. Oda, S. Tarucha

    Silicon Quantum Electronics Workshop 2015 2015/08/03

  122. Fabrication and characterization of gate-defined small Si-MOS quantum dot devices International-presentation

    J. Yoneda, T. Honda, K. Takeda, M. Marx, T. Otsuka, T. Nakajima, M. R. Delbecq, S. Amaha, G. Allison, T. Kodera, S. Oda, S. Tarucha

    Silicon Quantum Electronics Workshop 2015 2015/08/03

  123. Enhanced coherence time of spin qubits in GaAs and dynamics of the nuclear spin bath International-presentation

    M. R. Delbecq, T. Nakajima, T. Otsuka, S. Amaha, J. Yoneda, A. Noiri, A. Ludwig, A. D. Wieck, S. Tarucha

    International Conference on Electronic Properties of Two-Dimensional Systems 2015/07/28

  124. Realization of a Fast Single-lead Quantum Dot Probe and Evaluation of the Properties by Probing Quantum Dot States International-presentation

    T. Otsuka, S. Amaha, T. Nakajima, M. R. Delbecq, J. Yoneda, K. Takeda, R. Sugawara, A. Ludwig, A. D. Wieck, S. Tarucha

    International Conference on Electronic Properties of Two-Dimensional Systems 2015/07/28

  125. Electrically Pulsed Fourier Transform Spectroscopy of Coupled Electron Spins in Triple Quantum Dot International-presentation

    T. Nakajima, M. R. Delbecq, T. Otsuka, S. Amaha, J. Yoneda, A. Noiri, K. Takeda, A. Ludwig, A. D. Wieck, S. Tarucha

    International Conference on Electronic Properties of Two-Dimensional Systems 2015/07/28

  126. Boosting single electron spin flips in quantum dots International-presentation

    T. Ito, J. Yoneda, K. Takeda, A. Noiri, T. Otsuka, T. Nakajima, M. R. Delbecq, S. Amaha, S. Tarucha

    International Conference on Modulated Semiconductor Structures 2015/07/27

  127. A tunnel-coupled triangular triple quantum dot International-presentation

    A. Noiri, K. Kawasaki, S. Amaha, T. Otsuka, T. Nakajima, J. Yoneda, M. R. Delbecq, K. Takeda, S. Tarucha

    International Conference on Electronic Properties of Two-Dimensional Systems 2015/07/27

  128. Single-electron Spin Resonance in a Quadruple Quantum Dot International-presentation

    T. Otsuka, T. Nakajima, M. R. Delbecq, S. Amaha, J. Yoneda, K. Takeda, A. Noiri, R. Sugawara, A. Ludwig, A. D. Wieck, S. Tarucha

    International Conference on Electronic Properties of Two-Dimensional Systems 2015/07/27

  129. Exploring multiple quantum dots circuits charge stability diagrams

    Matthieu Delbecq, Takashi Nakajima, Tomohiro Otsuka, Shinichi Amaha, Jun Yoneda, John Watson, Michael Manfra, Seigo Tarucha

    日本物理学会 2015/03/23

  130. シングルリード量子ドットプローブの高速化と量子ドット状態測定による性能評価

    大塚朋廣, 天羽真一, 中島峻, DELBECQ M, 米田淳, 武田健太, 菅原烈, LUDWIG Arne, WIECK Andreas, 樽茶清悟

    日本物理学会 2015/03/23

  131. 3重量子ドットを用いた3スピン量子ビットの共鳴周波数・ラビ振動数の特性

    野入亮人, 米田淳, 中島峻, 大塚朋廣, Matthieu Delbecq, 天羽真一, Arne Ludwig, Andreas Wieck, 樽茶清悟

    日本物理学会 2015/03/23

  132. 電子スピン共鳴によるSi量子ドット中のスピン・バレー状態の考察

    武田健太, 神岡純, 小幡利顕, 大塚朋廣, 中島峻, DELBECQ M.R, 天羽真一, 米田淳, 野入亮人, 菅原烈, 小寺哲夫, 小寺哲夫, 小寺哲夫, 小田俊理, 樽茶清悟

    日本物理学会 2015/03/23

  133. 三重量子ドットにおけるスピン量子ビット実験の忠実度向上

    中島峻, DELBECQ M.R, 大塚朋廣, 天羽真一, 米田淳, 野入亮人, 武田健太, LUDWIG Arne, WIECK Andreas D, 樽茶清悟

    日本物理学会 2015/03/23

  134. アルミナ絶縁層を用いた傾斜磁場ESR法の改善

    伊藤匠, 野入亮人, 米田淳, 米田淳, 中島峻, 中島峻, 大塚朋廣, 大塚朋廣, 天羽真一, 樽茶清悟, 樽茶清悟

    日本物理学会 2015/03/23

  135. Boosting single electron spin flips in quantum dots by device engineering

    伊藤匠, 野入亮人, 米田淳, 中島峻, 大塚朋廣, 天羽真一, 樽茶清悟

    MERIT自主キャンプ 2015/03/10

  136. Implementation of three spin qubits in a lateral triple quantum dot International-presentation

    A. Noiri, T. Nakajima, J. Yoneda, M. Delbecq, T. Otsuka, S. Amaha, A. Ludwig, A. D. Wieck, S. Tarucha

    International Workshop on Topological Electronics 2015/03/09

  137. Single-electron spin resonance in a Si/SiGe double quantum dot with a micromagnet International-presentation

    K. Takeda, J. Kamioka, T. Obata, T. Otsuka, T. Nakajima, M. Delbecq, S. Amaha, J. Yoneda, A. Noiri, R. Sugawara, T. Kodera, S. Oda, S. Tarucha

    American Physical Society March Meeting 2015/03/05

  138. Addressable single-spin control in multiple quantum dots coupled in series International-presentation Invited

    T. Nakajima, M. R. Delbeq, T. Otsuka, S. Amaha, J. Yoneda, A. Noiri, A. D. Wieck, S. Tarucha

    American Physical Society March Meeting 2015/03/04

  139. Vanishing Influence from Nuclear Spins on Strongly Driven Single Electron Spins in Quantum Dots International-presentation

    J. Yoneda, T. Otsuka, T. Nakajima, T. Takakura, T. Obata, M.l Pioro-Ladriere, H. Lu, C. Palmstrom, A. C. Gossard, S. Tarucha, ual, contri

    International Symposium on Quantum System and Nuclear Spin Related Phenomena 2015/02/19

  140. Increase by several orders of magnitude of the spin coherence time in GaAs by fast measurements International-presentation

    M. R. Delbecq, T. Nakajima, T. Otsuka, S. Amaha, J. Yoneda, A. Noiri, A. Ludwig, A. D. Wieck, S. Tarucha

    International Symposium on Quantum System and Nuclear Spin Related Phenomena 2015/02/19

  141. 超高速量子ドットプローブを用いた半導体微細構造中の局所電子状態のダイナミクスの研究

    大塚朋廣, 天羽真一, 中島峻, Matthieu Delbecq, 米田淳, 武田健太, 菅原烈, Arne Ludwig, Andreas Wieck, 樽茶清悟

    理研奨励ファンド成果報告会 2015/01/14

  142. Addressable Control of Three Spin Qubits in Semiconductor Triple Quantum Dot International-presentation

    M. R. Delbeq, T. Nakajima, T. Otsuka, S. Amaha, J. Yoneda, A. Noiri, A. D. Wieck, S. Tarucha

    Workshop on Innovative Nanoscale Devices and Systems 2014/12/01

  143. Experimental Study of Spin Qubits in Triple Quantum Dot

    Tomohiro Otsuka, Takashi Nakajima, Matthieu R. Delbecq, Shinich Amaha, Jun Yoneda, Kenta Takeda, Akito Noiri, Retsu Sugawara, Seigo Tarucha

    半導体量子効果と量子情報の夏期研修会 2014/09/13

  144. Fabrication of silicon quantum devices with the goal of the implementation of a Triple Quantum Dot

    Marian Marx, Jun Yoneda, Giles Allison, Matthieu R. Delbecq, Takumu Honda, Tomohiro Otsuka, Kenta Takeda, Shinichi Amaha, Takashi Nakajima, Retsu Sugawara, Seigo Tarucha

    半導体量子効果と量子情報の夏期研修会 2014/09/12

  145. Implementation of three spin qubits in a lateral triple quantum dot

    Akito Noiri, Jun Yoneda, Takashi Nakajima, Tomohiro Otsuka, Shinichi Amaha, Matthieu R. Delbecq, Andreas D. Wieck, Seigo Tarucha

    半導体量子効果と量子情報の夏期研修会 2014/09/12

  146. Vertically and Laterally Coupled Quadruple Quantum Dot

    Shinich Amaha, Matthieu R. Delbecq, Takashi Nakajima, Tomohiro Otsuka, Jun Yoneda, Keiji Ono, Tsuyoshi Hatano, Seigo Tarucha

    半導体量子効果と量子情報の夏期研修会 2014/09/12

  147. Full Control of a Quadruple Quantum Dot Circuit Charge States in the Single Electron Regime

    Matthieu R. Delbecq, Takashi Nakajima, Tomohiro Otsuka, Shinichi Amaha, John D. Watson, Michael J. Manfra, Seigo Tarucha

    半導体量子効果と量子情報の夏期研修会 2014/09/11

  148. 微小磁石を備えたSi/SiGe2重量子ドットにおける単一電子スピン共鳴

    武田健太, 神岡純, 小幡利顕, 大塚朋廣, 中島峻, DELBECQ M, 天羽真一, 米田淳, 野入亮人, 菅原烈, 小寺哲夫, 小田俊理, 樽茶清悟

    日本物理学会 2014/09/08

  149. 三重量子ドットを用いたスピン・キュービット実験 II

    中島峻, 大塚朋廣, DELBECQ Matthieu, 天羽真一, 米田淳, 野入亮人, 武田健太, 菅原烈, 樽茶清悟

    日本物理学会 2014/09/08

  150. 三重量子ドットを用いたスピン・キュービット実験 I

    大塚朋廣, 中島峻, DELBECQ M, 天羽真一, 米田淳, 野入亮人, 武田健太, 菅原烈, 樽茶清悟

    日本物理学会 2014/09/08

  151. Full control of quadruple quantum dot circuit charge states in the single electron regime International-presentation

    M. R. Delbecq, T. Nakajima, T. Otsuka, S. Amaha, J. D. Watson, M. J. Manfra, S. Tarucha

    International Conference on The Physics of Semiconductors 2014/08/13

  152. Addressable control of single spin qubits in lateral triple quantum dot International-presentation

    T. Nakajima, M. R. Delbeq, T. Otsuka, S. Amaha, J. Yoneda, A. Noiri, A. D. Wieck, S. Tarucha

    International Conference on Low Temperature Physics 2014/08/08

  153. 縦横結合4重量子ドットの電気伝導特性

    天羽真一, M. Delbecq, 中島峻, 大塚朋廣, 大野圭司, D. G. Austing, 羽田野剛司, 樽茶清悟

    日本物理学会 2014/03/29

  154. Fast Single Spin Operation in Semiconductor Quantum Dots International-presentation

    T. Otsuka, J. Yoneda, T. Nakajima, T. Takakura, K. Yoshida, T. Obata, S. Tarucha, ual, contri

    FIRST International Symposium on Topological Quantum Technology 2014/01/29

  155. Scaling-up Spin Qubits in Semiconductor Quantum Dots International-presentation

    T. Nakajima, T. Otsuka, M. R. Delbeq, S. Amaha, J. Yoneda, A. Noiri, K. Takeda, J. Kamioka, R. Sugawara, J. Watson, M. J. Manfra, A. D. Wieck, S. Tarucha

    FIRST International Symposium on Topological Quantum Technology 2014/01/29

  156. Fast Single Spin Operation in Semiconductor Quantum Dots

    Tomohiro Otsuka, Jun Yoneda, Takashi Nakajima, Tatsuki Takakura, Katsuharu Yoshida, Toshiaki Obata, Seigo Tarucha

    Emergent Matter Science Research Facility Work Shop 2013/12/20

  157. Fast Single Spin Operation in Semiconductor Quantum Dots

    Tomohiro Otsuka, Jun Yoneda, Takashi Nakajima, Tatsuki Takakura, Katsuharu Yoshida, Toshiaki Obata, Seigo Tarucha, ual contributi

    量子サイバネティクス全体会議 2013/12/16

  158. Single-step Z Rotation of a Single Spin Qubit in a Semiconductor Quantum Dot

    Jun Yoneda, Tomohiro Otsuka, Takashi Nakajima, Tatsuki Takakura, Katsuharu Yoshida, Toshiaki Obata, S. Tarucha, ual, contri

    量子情報処理プロジェクト全体会議 2013/12

  159. Scale-up of spin qubits in semiconductor quantum dots

    Tomohiro Otsuka, Takashi Nakajima, Matthieu R. Delbeq, Shinichi Amaha, Jun Yoneda, Kenta Takeda, Akito Noiri, Jun Kamioka, Retsu Sugawara, John Watson, Michael J. Manfra, Hong Lu, Borzoyeh Shojaei, Christopher Palmstrøm, Arthur Gossard, S. Tarucha

    量子情報処理プロジェクト全体会議 2013/12

  160. 単一電子スピン量子ビットの位相ゲート

    米田淳, 大塚朋廣, 中島峻, 高倉樹, 小幡利顕, 樽茶清悟

    日本物理学会 2013/09/27

  161. 3端子3重量子ドットにおけるパウリスピンブロッケード

    野入亮人, 高倉樹, 小幡利顕, 大塚朋廣, 中島峻, 米田淳, 樽茶清悟

    日本物理学会 2013/09/27

  162. 量子ポイントコンタクトを用いた量子ホールエッジ状態におけるエネルギー緩和の観測

    大塚朋廣, 大月朋廣, 杉原裕規, 米田淳, 中島峻, 樽茶清悟

    日本物理学会 2013/09/26

  163. Recent Progress on GaAs-based Spin Qubits

    Tomohiro Otsuka, Takashi Nakajima, Matthieu R. Delbecq, Shinich Amaha, Jun Yoneda, Kenta Takeda, Akito Noiri, Jun Kamioka, Katsuharu Yoshida, Toshiaki Obata, Hong Lu, Borzoyeh Shojaei, Christopher Palmstrøm, Arthur Gossard, John Watson, Michael J. Manfra, Seigo Tarucha

    半導体量子効果と量子情報の夏期研修会 2013/09/04

  164. Spin-based Quantum Information Processing with Quantum Dots

    Tomohiro Otsuka, Takashi Nakajima, Matthieu R. Delbecq, Jun Yoneda, Kenta Takeda, Seigo Tarucha

    RIKEN 異分野交流の夕べ 2013/08

  165. Direct phase control of a single spin qubit International-presentation

    J. Yoneda, T. Otsuka, T. Nakajima, T. Takakura, T. Obata, H. Lu, C. Palmstrom, A. C. Gossard, S. Tarucha, ual, contri

    International School and Conference on Spintronics and Quantum Information Technology 2013/07/31

  166. Coherent dynamics of a strongly driven single electron spin International-presentation

    J. Yoneda, T. Otsuka, T. Nakajima, T. Takakura, T. Obata, H. Lu, C. Palmstrom, A. C. Gossard, S. Tarucha, ual, contri

    International Conference on Electronic Properties of Two-dimentional Systems 2013/07/04

  167. Probing energy relaxation in quantum Hall edge states utilizing quantum point contacts International-presentation

    T. Otsuka, Y. Sugihara, J. Yoneda, T. Nakajima, S. Tarucha, ual, contri

    International Conference on Electronic Properties of Two-dimentional Systems 2013/07/02

  168. Spin-based Quantum Information Processing with Quantum Dots

    Tomohiro Otsuka, Takashi Nakajima, Matthieu R. Delbecq, Jun Yoneda, Kenta Takeda, Seigo Tarucha

    RIKEN CEMS One Day Workshop 2013/04

  169. トンネル結合制御可能な横型4重量子ドット

    野入亮人, 高倉樹, 小幡利顕, 大塚朋廣, 米田淳, 吉田勝治, 樽茶清悟

    日本物理学会 2013/03/29

  170. 単一電子スピン高速ラビ振動の時間分解測定

    米田淳, 大塚朋廣, 中島峻, 高倉樹, 小幡利顕, 樽茶清悟

    日本物理学会 2013/03/29

  171. GaAs系量子ポイントコンタクトにおけるコンダクタンスの揺らぎのゲートバイアス依存性

    中島峻, 大塚朋廣, 米田淳, 野入亮人, 樽茶清悟

    日本物理学会 2013/03/26

  172. Fast electrical manipulation of single electron spins in semiconductor quantum dots

    Jun Yoneda, Tomohiro Otsuka, Takashi Nakajima, Tatsuki Takakura, Katsuharu Yoshida, Toshiaki Obata, Seigo Tarucha, Hong Lu, Borzoyeh Shojaei, Christopher Palmstrøm, Arthur Gossard

    量子情報処理プロジェクト、量子サイバネティクス全体会議 2012/12

  173. Detection of spin polarization utilizing singlet and triplet states in a single-lead quantum dot

    Tomohiro Otsuka, Yuuki Sugihara, Jun Yoneda, Shingo Katsumoto, Seigo Tarucha

    半導体量子効果と量子情報の夏期研修会 2012/09/06

  174. Recent progress in a semiconductor quantum dot system for quantum computation - speeding up and scaling up

    Jun Yoneda, Tomohiro Otsuka, Takashi Nakajima, Akito Noiri, Tatsuki Takakura, Kenta Takeda, Toshiaki Obata, Katsuharu Yoshida, Seigo Tarucha, Hong Lu, Borzoyeh Shojaei, Christopher Palmstrøm, Arthur Gossard

    半導体量子効果と量子情報の夏期研修会 2012/09/06

  175. Fast Electrical Control of Single Spins in Semiconductor Quantum Dots International-presentation

    J. Yoneda, T. Otsuka, T. Takakura, K. Yoshida, T. Obata, S. Tarucha, H. Lu, C. Palmstrom, A. C. Gossard, qual contribution

    International Conference on the Physics of Semiconductors 2012/08/02

  176. Single to Quadruple Quantum Dots with Tunable Interdot Tunnel Couplings International-presentation

    T. Takakura, A. Noiri, T. Obata, T. Otsuka, J. Yoneda, K. Yoshida, S. Tarucha

    International Conference on the Physics of Semiconductors 2012/08/02

  177. Detection of spin polarization with two-electron states in a single-lead quantum dot International-presentation

    T. Otsuka, Y. Sugihara, J. Yoneda, S. Katsumoto, S. Tarucha

    International Conference on the Physics of Semiconductors 2012/07/30

  178. Speed-up of spin manipulations in semiconductor quantum dots International-presentation

    T. Otsuka, J. Yoneda, T. Takakura, K. Yoshida, T. Obata, S. Tarucha, H. Lu, C. Palmstrom, A. C. Gossard, qual contribution

    International Conference on Quantum Dots 2012/05/18

  179. シングルリード量子ドット中の2電子状態を用いたスピン偏極検出

    大塚朋廣, 杉原裕規, 米田淳, 小幡利顕, 勝本信吾, 樽茶清悟

    日本物理学会 2012/03/26

  180. 大きなZeeman磁場差を有する二重量子ドットでの電子スピン共鳴実験

    米田淳, 大塚朋廣, 高倉樹, 小幡利顕, 樽茶清悟

    日本物理学会 2012/03/26

  181. Speeding up single electron spin rotations in semiconductor quantum dots

    Jun Yoneda, Tomohiro Otsuka, Tatsuki Takakura, Katsuharu Yoshida, Toshiaki Obata, Seigo Tarucha, Hong Lu, Christopher Palmstrøm, qual contributio

    量子情報処理プロジェクト、量子サイバネティクス全体会議 2011/12/13

  182. Speeding up single electron spin rotations in semiconductor quantum dots International-presentation

    J. Yoneda, T. Otsuka, T. Takakura, K. Yoshida, T. Obata, S. Tarucha, H. Lu, C. Palmstrom, A. C. Gossard, qual contribution

    International Workshop on Solid-State Quantum Computing 2011/12/12

  183. Speed-up of Single Electron Spin Manipulation in Semiconductor Quantum Dots International-presentation

    J. Yoneda, T. Otsuka, T. Takakura, K. Yoshida, T. Obata, S. Tarucha, ual, contri

    International Workshop on Quantum Nanostructures and Nanoelectronics 2011/10

  184. 隣接量子ドット間ゼーマンエネルギー差の微小磁石設計による制御

    米田淳, 大塚朋廣, 高倉樹, 小幡利顕, 樽茶清悟

    日本物理学会 2011/09/24

  185. Si/SiGe量子ドット構造のシミュレーションと作製

    福岡佑二, 小寺哲夫, 大塚朋廣, 武田健太, 小幡利顕, 吉田勝治, 澤野憲太郎, 内田建, 白木靖寛, 樽茶清悟, 小田俊理

    応用物理学会 2011/09/01

  186. Si/SiGe量子ドットにおけるショットキーゲート電極に対する考察

    武田健太, 小幡利顕, 福岡佑二, 大塚朋廣, 小寺哲夫, 吉田勝治, 澤野憲太郎, 小田俊理, 白木靖寛, 樽茶清悟

    日本物理学会 2011/03/28

  187. 横結合型量子ドットによる量子ドットのエネルギー準位スペクトル測定

    桑原優樹, KIM Sunwoo, 大塚朋廣, 家泰弘, 勝本信吾

    日本物理学会 2011/03/28

  188. 高速スピン回転操作のための大きな磁場差をもつ二重量子ドットデバイス

    米田淳, 大塚朋廣, 高倉樹, 小幡利顕, 樽茶清悟

    日本物理学会 2011/03/28

  189. Si/SiGe量子ドット作製に向けたPdトップゲート動作点の低電圧化

    福岡佑二, 小寺哲夫, 大塚朋廣, 武田健太, 小幡利顕, 吉田勝治, 澤野憲太郎, 内田建, 白木靖寛, 樽茶清悟, 小田俊理

    応用物理学関係連合講演会 2011/03/26

  190. Speed-up of spin manipulation in semiconductor quantum dot

    Tomohiro Otsuka, Jun Yoneda, Toshiaki Obata, Tatsuki Takakura, Kenta Takeda, Katsuharu Yoshida, Seigo Tarucha

    量子情報処理プロジェクト報告会 2010/12

  191. PdショットキーゲートによるSi/SiGe量子ドットの作製とその評価

    武田健太, 小幡利顕, 福岡佑二, 大塚朋廣, 小寺哲夫, 吉田勝治, 澤野憲太郎, 小田俊理, 白木靖寛, 樽茶清悟

    日本物理学会 2010/09/24

  192. Lateral dot fabrication by using a MOS electric gate on SiGe hetero structure.

    小幡利顕, 申潤錫, ロランドブルナ, 武田健太, 福岡佑二, 大塚朋廣, 小寺哲夫, 吉田勝治, 澤野憲太郎, 小田俊理, 白木靖寛, 樽茶清悟

    日本物理学会 2010/09/24

  193. Si/SiGe系2DEGのPdショットキーゲート制御による結合量子ドットの作製

    福岡佑二, 小寺哲夫, 大塚朋廣, 武田健太, 小幡利顕, 吉田勝治, 澤野憲太郎, 内田建, 白木靖寛, 樽茶清悟, 小田俊理

    応用物理学会 2010/09/14

  194. 微小磁石を用いた半導体量子ドット中の電子スピン操作

    大塚朋廣, 米田淳, 小幡利顕, 高倉樹, 武田健太, Michel Pioro-Ladriere, 吉田勝治, 樽茶清悟

    量子情報処理プロジェクトサマースクール 2010/08

  195. Energy level spectroscopy of a quantum dot with a side‐coupled satellite dot International-presentation

    Sunwoo Kim, Yuki Kuwabara, Tomohiro Otsuka, Yasuhiro Iye, Singo Katsumoto

    International Conference on the Physics of Semiconductors 2010/07

  196. Probing Local Electronic States in the Quantum Hall Regime with a Side Coupled Quantum Dot International-presentation

    T. Otsuka, E. Abe, Y. Iye, S. Katsumoto

    International Symposium on Quantum Nanostructures and Spin-related Phenomena 2010/03

  197. Probing local electronic states in the quantum Hall regime International-presentation

    T. Otsuka, E. Abe, Y. Iye, S. Katsumoto

    International Symposium on Quantum Nanophotonics and Nanoelectronics 2009/11

  198. 横結合型量子ドットを用いた量子ホール状態の観測

    大塚朋廣, 阿部英介, 家泰弘, 勝本信吾

    日本物理学会 2009/09/26

  199. Probing edge states in the quantum Hall regime with a side coupled quantum dot International-presentation

    T. Otsuka, E. Abe, Y. Iye, S. Katsumoto

    International Symposium on Compound Semiconductors 2009/08

  200. Detection of spin polarization in a quantum wire International-presentation

    Tomohiro Otsuka, Eisuke Abe, Yasuhiro Iye, Shingo Katsumoto

    International Conference on Electronic Properties of Two-dimentional Systems 2009/07/21

  201. 側面結合量子ドットによるスピン偏極検出

    大塚朋廣, 阿部英介, Amnon Aharony, Ora Entin-Wohlman, 都倉康弘, 勝本信吾

    ナノ量子情報エレクトロニクス公開シンポジウム 2009/04/22

  202. 横結合型量子ドットを用いたスピン偏極の検出

    大塚朋廣, 阿部英介, 家泰弘, 勝本信吾

    日本物理学会 2009/03/30

  203. Detection of spin polarization with a side coupled quantum dot International-presentation

    T. Otsuka, E. Abe, Y. Iye, S. Katsumoto

    International Symposium on Nanoscale Transport and Technology 2009/01/22

  204. 側面結合した量子ドットによるスピン検出

    勝本信吾, 大塚朋廣, 阿部英介, 家泰弘

    物性科学領域横断研究会 2008/11

  205. Excited state spectroscopy in side-coupled quantum dots International-presentation

    T. Otsuka, E. Abe, Y. Iye, S. Katsumoto

    The IEEE Nanotechnology Materials and Devices Conference 2008/10/21

  206. 横結合型量子ドットにおける励起状態の観測

    大塚朋廣, 阿部英介, 家泰弘, 勝本信吾

    日本物理学会 2008/09/20

  207. 半導体量子ドットスピン状態の制御

    大塚朋廣, 阿部英介, 勝本信吾

    スピン流の創出と制御研究会 2008/02

  208. T結合型量子ドットにおけるクーロン相互作用を利用した軌道占有制御

    大塚朋廣, 阿部英介, 家泰弘, 勝本信吾

    ナノ量子情報シンポジウム 2007/10/25

  209. Control of shell filling with Coulomb interaction in quantum dots side-coupled to quantum wires International-presentation

    T. Otsuka, E. Abe, Y. Iye, S. Katsumoto

    International Symposium on Compound Semiconductors 2007/10/15

  210. 横結合型量子ドットにおけるクーロン相互作用

    大塚朋廣, 阿部英介, 勝本信吾, 家泰弘

    日本物理学会 2007/09/24

  211. Potential dependent intra-dot Coulomb interaction in quantum dots side-coupled to quantum wires International-presentation

    Tomohiro Otsuka, Eisuke Abe, Yasuhiro Iye, Shingo Katsumoto

    International Conference on Electronic Properties of Two-dimentional Systems 2007/07

  212. 近藤状態の非局所制御

    大塚朋廣, 勝本信吾, 家泰弘

    日本物理学会 2007/03/20

  213. Electronic states in quantum dots side-coupled to quantum wires International-presentation

    Tomohiro Otsuka, Eisuke Abe, Shingo Katsumoto, Yasuhiro Iye

    Frontiers in Nanoscale Science and Technology Workshop 2007/03

  214. 近藤状態の非局所制御

    大塚朋廣, 勝本信吾, 家泰弘

    半導体スピン工学の基礎と応用研究会 2006/12

  215. Phase Information from Two-Terminal Conductance of Quantum Dot Systems International-presentation

    T. Otsuka, H. Aikawa, M. Eto, G. L. Khym, K. Kang, Y. Iye, S. Katsumoto

    International Conference on the Physics of Semiconductors 2006/07/28

  216. 2端子ABリングでの位相固定の破れについて

    勝本信吾, 大塚朋廣, Amnon Aharony, Ora Entin-Wohlman

    日本物理学会 2006/03/29

  217. 横結合型量子ドットを持つ量子細線の伝導特性

    大塚朋廣, 勝本信吾, 家泰弘, G. L. Khym, Kicheon Kang

    日本物理学会 2006/03/29

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Research Projects 9

  1. プラズママテリアルズインフォマティクスが拓く完全カイラリティ制御ナノチューブ合成

    加藤 俊顕, 岩崎 悠真, 大塚 朋廣, 是常 隆

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 基盤研究(A)

    Institution: 東北大学

    2023/04/01 - 2027/03/31

  2. 半導体量子ドットデバイスの放射線応答の調査と放射線検出器への利用

    吉田 斉, 岸本 康宏, 大塚 朋廣

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 挑戦的研究(萌芽)

    Category: 挑戦的研究(萌芽)

    Institution: 大阪大学

    2022/06/30 - 2025/03/31

  3. デコヒーレンスを活用した革新的量子技術の研究

    大塚 朋廣

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 挑戦的研究(萌芽)

    Institution: 東北大学

    2021/07/09 - 2024/03/31

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    量子状態が壊れてしまうデコヒーレンスは、現状の現実世界の量子系では避けることができず、量子系の活用において問題となっている。しかし、もしこのデコヒーレンスをうまく利用できれば、有用な量子技術の要素として活用できる可能性もある。本研究では、操作性の良いデコヒーレンスを導入可能である半導体量子ドット系を用いて、デコヒーレンスについての物理解明を進め、これを活用した量子技術について研究している。本年度は特に半導体量子ドット系を用いた実験環境の整備、改良や、半導体量子ドット系の測定を中心に研究を行った。 本研究では半導体量子ドットの中に形成される電圧等で人工的に制御可能な量子状態を実験系として利用する。このため、半導体微細加工技術を活用することにより、量子効果の発現する半導体量子ドット試料の作製を行った。また半導体量子ドット中の量子状態を明瞭に観測できる極低温環境における単一電子検出回路等の整備を行い、さらにその測定感度を向上させるための改良を行った。そしてこれを利用して半導体量子ドット系での量子状態の測定を行い、量子ドット内にトラップされた電子のスピンを利用した量子状態を観測した。また極低温環境下での高速電気信号制御系についても整備を行い、これを利用して半導体量子ドット中の量子状態の制御についても実施した。また半導体量子ドット系におけるデコヒーレンスに関するパラメータについても、その制御、評価を開始した。

  4. Elucidation and control of hole spin dynamics in quantum structures

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (A)

    Institution: Tokyo Institute of Technology

    2020/04/01 - 2023/03/31

  5. 先進プラズマ活用1次元ナノカーボン材料の完全原子配列制御合成と革新的応用開拓

    加藤 俊顕, 大塚 朋廣, 澁田 靖

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 基盤研究(A)

    Institution: 東北大学

    2019/04/01 - 2023/03/31

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    研究四年計画の二年度目にあたる今年度は、1次元ナノカーボン材料の原子レベル構造制御合成と応用に向けた研究を行い以下の成果を得た。 第一に、初年度に立ち上げたその場観測プラズマCVDを用いることで、(6,5)ナノチューブの90%以上の超高純度合成を実現した。これはこれまで報告されている(6,5)ナノチューブの世界最高純度である。次年度以降では、プラズマ条件の最適化によりさらなる高純度化、及び(6,5)以外のカイラリティの選択合成を目指す。 第二に、グラフェンナノリボンの量子デバイス応用に関して、本手法で合成したグラフェンナノリボンにおいて、量子化に伴う励起準位が明確に発現することを実証した。また、通常数百ミリKでしか安定に存在しない励起準位が20K以上の高温条件でも観測可能であることを明らかとした。さらに、グラフェンナノリボン合成に用いるニッケルナノバー長とプラズマCVD合成条件を最適化することで、励起準位が観測できるグラフェンナノリボン量子ドットを高確率で合成することにも成功した。次年度以降は、高確率で励起準位観測が可能な本GNR量子ドットを用いることで、二重量子ドットを活用した量子演算の実証を試みる。 第三に、1次元ナノカーボン材料と類似の原子層物質である遷移金属ダイカルコゲナイドに関して、一般的な気相―固相相転移に加え、液相―固相相転移による結晶成長が支配的であることを実験的に明らかにした。さらに、液相―固相相転移において、液相前駆体の化学ポテンシャルが核成長に与える効果を熱力学的観点から実験的に説明することに成功した。

  6. スピン変換研究に向けた電気的超高速局所スピンプローブの開発と応用

    大塚 朋廣

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 新学術領域研究(研究領域提案型)

    2017/04/01 - 2019/03/31

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    本研究では半導体量子ドット等の半導体ナノ構造を活用することにより、固体ナノ構造中の局所スピン状態およびその時間変化にアクセスできる電気的高速局所スピンプローブを開発し、これを用いて固体ナノ構造中の局所スピン現象を調べた。本年度は特に、電気的高速局所スピンプローブ手法の改良、およびこのスピンプローブを用いた固体ナノ構造中の局所スピン状態ダイナミクスの測定解析を中心に行った。 固体ナノ構造中でのスピン変換現象等をミクロに解明するためには、固体ナノ構造中の局所スピン状態に直接アクセスできる局所スピンプローブが有用となる。半導体量子ドット内にはスピンに依存した準位が存在し、この準位への電子のトンネルを調べることで、固体ナノ構造中の局所スピン状態を調べるプローブを実現することができる。またこのプローブを高周波測定技術と組み合わせることによって、ダイナミクスまで測定することが可能となる。この電気的高速局所スピンプローブを用いて、固体ナノ構造中の局所スピン状態およびそのダイナミクスを調べた。二次元電子ガスからなる電極と結合した半導体量子ドット中の電子スピンについて測定を行い、単一電子レベルで電荷状態とスピン状態の時間変化に差があることを明らかにした。この結果について、ミクロなモデルを構築して計算を行い、実験結果を再現することに成功した。また電気的高速局所スピンプローブの測定手法を活用することにより、他の固体ナノ構造中の局所スピン状態の観測と操作の研究についても貢献した。

  7. 高速量子プローブを用いた微小系の電子輸送ゆらぎの研究

    大塚 朋廣

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 新学術領域研究(研究領域提案型)

    Institution: 国立研究開発法人理化学研究所

    2016/04/01 - 2018/03/31

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    本研究では、半導体微細構造を活用した微小系を用いて、微小系における電子輸送、ゆらぎ、ダイナミクスの測定、解明を行った。本年度は特に高速量子プローブを活用した微小系における局所電子状態のダイナミクス測定、量子微小系の局所電子状態測定を中心に実施した。 微小系における局所電子状態およびそのダイナミクスは、物性科学等の基礎科学やエレクトロニクスデバイス等の応用の両面から重要となっている。この微小系における局所電子状態について、高速量子プローブを使って引き続き測定し、またその結果の解析を行った。半導体量子ドットからなる開放微小系について、局所電子状態の測定を実施したところ、局所電子状態が電極との結合に依存してマイクロ秒程度の時間スケールで変化する様子を観測した。さらに半導体量子ドット中の局所電子状態の時間変化の詳細を調べたところ、トンネルの低次の過程と、高次の過程による電子状態変化をミクロな観点から解明することができた。 また高速量子プローブで開発してきた測定手法は、古典微小系だけでなく量子現象が発現する量子微小系に対しても適用可能である。量子微小系は量子エレクトロニクス、量子情報処理等に向けて近年、注目を集めており、本研究では高速量子プローブの技術を活用して量子微小系における局所電子状態測定を行った。この結果、量子ドット内状態の高精度操作、多重量子ドットにおける電子状態操作の実現等に貢献した。

  8. Probing local electronic and spin states in semiconductor microstructures by single-lead quantum dots

    OTSUKA Tomohiro

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Young Scientists (B)

    Institution: The Institute of Physical and Chemical Research

    2013/04/01 - 2015/03/31

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    We measured local electronic and spin states in semiconductor microstructures by probes utilizing quantum microstructures. We analyzed experimental results on the measurement of energy relaxation in quantum Hall edge states by quantum point contacts and revealed a possible mechanism of the probe operation. We developed new fast local electronic probes, which can access dynamics of local electronic and spin states, by using the quantum dot probes and high frequency measurement techniques. We applied these new probes to measure local electronic states in quantum dots and confirmed the operation and examined the characteristics.

  9. Study of quantum coherence in multiple system utilizing multi single-lead quantum dots

    OTSUKA Tomohiro

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Research Activity Start-up

    Institution: The University of Tokyo

    2010 - 2011

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    We have demonstrated experiments relating multiple quantum systems utilizing semiconductor nano structures. We measured relaxation in quantum Hall edge states, which are important components of multiple quantum systems, with quantum point contacts and discussed about the relaxation mechanisms. We also developed a new method to detect local spin polarization in semiconductor nano structures, which is essential in spin related quantum systems, by using single-lead quantum dots and confirmed its operation. With this new method, we probed local spin polarization formed in quantum Hall edge states.

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Media Coverage 12

  1. 量子ドットの電荷状態を高速に検出する解析手法を開発 ─ 量子コンピュータの読み出し速度向上や物性探索に期待

    東北大学プレスリリース

    2025/04/09

    Type: Internet

  2. 酸化亜鉛における電界制御量子ドット形成と量子多体効果観測を実現 ─新材料量子デバイス開発に期待─

    東北大学プレスリリース

    2024/11/08

    Type: Internet

  3. 機械学習活用による量子ドットの電荷状態推定と可視化に基づく更なる性能改善を実証 ─量子コンピューターの大規模化への貢献に期待─

    東北大学プレスリリース

    2024/04/22

    Type: Internet

  4. 東北大、機械学習活用による量子ドットの電荷状態推定と可視化に基づく更なる性能改善を実証

    日本経済新聞

    2024/04/22

    Type: Internet

  5. 電気伝導の詳細評価 単一コロイド量子ドット 東北工大など

    日刊工業新聞

    2023/12/18

    Type: Newspaper, magazine

  6. 単一コロイド量子ドットで電気伝導の評価と制御に成功

    東北大学プレスリリース

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