Details of the Researcher

PHOTO

Fumihiro Kaneda
Section
Graduate School of Science
Job title
Professor
Degree

  • 博士（工学）（東北大学）

  • 修士（工学）（東北大学）

Committee Memberships 3

  • 教務委員会　学内委員

    2025/04 - Present

  • 広報委員会　学内委員

    2023/04 - Present

  • University of Waterloo　Thesis Dissertation External Examiner

    2024/05 - 2024/05

Professional Memberships 2

  • Optical Society of America

  • THE PHYSICAL SOCIETY OF JAPAN

Research Areas 1

  • Natural sciences / Semiconductors, optical and atomic physics /

Awards 7

  1. Distinguished researcher

    2023/05　Tohoku University

  2. The Young Scientists’ Award, The Commendation for Science and Technology by MEXT

    2023/04

  3. OSA Outstanding Reviewer

    2021/08　The Optical Society

  4. プロミネントリサーチフェロー

    2021/07　東北大学

  5. Young Scientist Award of the Physical Society of Japan

    2020/11　Physical Society of Japan

  6. 優秀ポスター発表賞

    2020/01　日本レーザー学会　自発パラメトリック下方変換光子対の高精度位相整合スペクトル評価方法の開発

  7. Poster award

    2019/12　The 2nd International Forum on Quantum Metrology and Sensing（IFQMS)　High-precision characterization of quantum optical resources via classical measurements

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Papers 21

  1. Low‐Loss Polarization‐Maintaining Router for Single and Entangled Photons at a Telecom Wavelength

    Pengfei Wang, Soyoung Baek, Masahiro Yabuno, Shigehito Miki, Hirotaka Terai, Fumihiro Kaneda

    Advanced Quantum Technologies　2025/09/02

    DOI： 10.1002/qute.202500355 　

  2. Low-loss polarization-maintaining optical router for photonic quantum information processing

    Pengfei Wang, Soyoung Baek, Keiichi Edamatsu, Fumihiro Kaneda

    Japanese Journal of Applied Physics　63　(4)　040901-040901　2024/04/01

    Publisher: IOP Publishing

    DOI： 10.35848/1347-4065/ad3533 　

    ISSN： 0021-4922

    eISSN： 1347-4065

    More details Close

    Abstract In photonic quantum applications, optical routers are required to handle single photons with low loss, high speed, and preservation of their quantum states. Single-photon routing with maintained polarization states is particularly important for utilizing them as qubits. Here, we demonstrate a polarization-maintaining electro-optic router compatible with single photons. Our custom electro-optic modulator is embedded in a configuration of a Mach–Zehnder interferometer, where each optical component achieves polarization-maintaining operation. We observe the performance of the router with 2%–4% loss, 20 dB switching extinction ratio, 2.9 ns rise time, and >99% polarization process fidelity to an ideal identity operation.

  3. (Proceedings) Spectrally Pure Heralded Single Photons at Telecommunication O-Band from a Custom-Poled KTiPO<inf>4</inf> Crystal

    Wu Hao Cai, Rui Bo Jin, Keiichi Edamatsu, Fumihiro Kaneda

    Quantum 2.0: Proceedings Optica Quantum 2.0 Conference and Exhibition　2023/06

    DOI： 10.1364/QUANTUM.2023.QW2A.33 　

  4. (Proceedings) Engineering Spatial Entanglement of Photon Pairs Generated from Parametric Down-Conversion

    Soyoung Baek, Fumihiro Kaneda, Yasuyoshi Mitsumori, Keiichi Edamatsu

    Optica Quantum 2.0 Conference and Exhibition　2023/06

    Publisher: Optica Publishing Group

    DOI： 10.1364/quantum.2023.qw2a.38 　

    More details Close

    We present our recent progress on developing a parametric down-conversion source producing highly entangled photons in spatial mode toward quantum-enhanced spa-tial measurements. The degree of transverse spatial entanglement is engineered and characterized.

  5. (Proceedings) Experimental Single-qubit Variable-strength Measurement Using a Quantum Computer

    Tingrui Dong, Soyoung Beak, Fumihiro Kaneda, Keiichi Edamatsu

    Optica Quantum 2.0 Conference and Exhibition　2023/06

    Publisher: Optica Publishing Group

    DOI： 10.1364/quantum.2023.qtu3a.13 　

    More details Close

    We demonstrate the single-qubit variable-strength measurement and the error-disturbance relation in a quantum computer. It illustrated that an quantum computer can be a useful platform for exploring the foundation of quantum physics.

  6. Multi-Order Quasi-Phase Matching for Generation of Pure Heralded Single Photons

    Fumihiro Kaneda, Jo Oikawa, Masahiro Yabuno, Fumihiro China, Shigehito Miki, Hirotaka Terai, Yasuyoshi Mitsumori, Keiichi Edamatsu

    Optics InfoBase Conference Papers　2022

  7. Spectral characterization of photon-pair sources via classical sum-frequency generation Peer-reviewed

    Fumihiro Kaneda, Jo Oikawa, Masahiro Yabuno, Fumihiro China, Shigehito Miki, Hirotaka Terai, Yasuyoshi Mitsumori, Keiichi Edamatsu

    OPTICS EXPRESS　28　(26)　38993-39004　2020/12

    DOI： 10.1364/OE.412448 　

    ISSN： 1094-4087

  8. High-Precision Spectral Measurements of Photon-Pair Sources via Frequency-Resolved Sum-Frequency Generation

    Fumihiro Kaneda, Jo Oikawa, Yasuyoshi Mitsumori, Keiichi Edamatsu

    Conference Proceedings - Lasers and Electro-Optics Society Annual Meeting-LEOS　2020-　2020/05/01

    Publisher: Institute of Electrical and Electronics Engineers Inc.

    ISSN： 1092-8081

  9. High-Precision Spectral Measurements of Photon-Pair Sources via Frequency-Resolved Sum-Frequency generation

    Fumihiro Kaneda, Jo Oikawa, Yasuyoshi Mitsumori, Keiichi Edamatsu

    2020 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)　2020

    ISSN： 2160-9020

  10. High-efficiency single-photon generation via large-scale active time multiplexing Peer-reviewed

    F. Kaneda, P. G. Kwiat

    Science Advances　5　(10)　eaaw8586　2019/10/11

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

    DOI： 10.1126/sciadv.aaw8586 　

  11. Direct generation of frequency-bin entangled photons via two-period quasi-phase-matched parametric downconversion Peer-reviewed

    Kaneda Fumihiro, Suzuki Hirofumi, Shimizu Ryosuke, Edamatsu Keiichi

    OPTICS EXPRESS　27　(2)　1416-1424　2019/01/21

    DOI： 10.1364/OE.27.001416 　

    ISSN： 1094-4087

    eISSN： 1094-4087

  12. Quantum-memory-assisted multi-photon generation for efficient quantum information processing Peer-reviewed

    Fumihiro Kaneda, Feihu Xu, Joseph Chapman, Paul G. Kwiat

    OPTICA　4　(9)　1034-1037　2017/09

    DOI： 10.1364/OPTICA.4.001034 　

    ISSN： 2334-2536

  13. Heralded single-photon source utilizing highly nondegenerate, spectrally factorable spontaneous parametric downconversion Peer-reviewed

    Fumihiro Kaneda, Karina Garay-Palmett, Alfred B. U'Ren, Paul G. Kwiat

    OPTICS EXPRESS　24　(10)　2016/05

    DOI： 10.1364/OE.24.010733 　

    ISSN： 1094-4087

  14. Time-multiplexed heralded single-photon source Peer-reviewed

    Fumihiro Kaneda, Bradley G. Christensen, Jia Jun Wong, Hee Su Park, Kevin T. McCusker, Paul G. Kwiat

    OPTICA　2　(12)　1010-1013　2015/12

    DOI： 10.1364/OPTICA.2.001010 　

    ISSN： 2334-2536

  15. Experimental Test of Error-Disturbance Uncertainty Relations by Weak Measurement Peer-reviewed

    Fumihiro Kaneda, So-Young Baek, Masanao Ozawa, Keiichi Edamatsu

    PHYSICAL REVIEW LETTERS　112　(2)　2014/01

    DOI： 10.1103/PhysRevLett.112.020402 　

    ISSN： 0031-9007

    eISSN： 1079-7114

  16. Experimental violation and reformulation of the Heisenberg's error-disturbance uncertainty relation Peer-reviewed

    So-Young Baek, Fumihiro Kaneda, Masanao Ozawa, Keiichi Edamatsu

    SCIENTIFIC REPORTS　3　2013/07

    DOI： 10.1038/srep02221 　

    ISSN： 2045-2322

  17. Entangled-state generation with an intrinsically pure single-photon source and a weak coherent source Peer-reviewed

    Rui-Bo Jin, Ryosuke Shimizu, Fumihiro Kaneda, Yasuyoshi Mitsumori, Hideo Kosaka, Keiichi Edamatsu

    PHYSICAL REVIEW A　88　(1)　2013/07

    DOI： 10.1103/PhysRevA.88.012324 　

    ISSN： 1050-2947

    eISSN： 1094-1622

  18. Experimental Activation of Bound Entanglement Peer-reviewed

    Fumihiro Kaneda, Ryosuke Shimizu, Satoshi Ishizaka, Yasuyoshi Mitsumori, Hideo Kosaka, Keiichi Edamatsu

    PHYSICAL REVIEW LETTERS　109　(4)　2012/07

    DOI： 10.1103/PhysRevLett.109.040501 　

    ISSN： 0031-9007

    eISSN： 1079-7114

  19. Entangled photon generation in two-period quasi-phase-matched parametric down-conversion Peer-reviewed

    Wakana Ueno, Fumihiro Kaneda, Hirofumi Suzuki, Shigehiro Nagano, Atsushi Syouji, Ryosuke Shimizu, Koji Suizu, Keiichi Edamatsu

    OPTICS EXPRESS　20　(5)　5508-5517　2012/02

    DOI： 10.1364/OE.20.005508 　

    ISSN： 1094-4087

  20. Generation and characterization of bound entanglement in optical qubits

    Fumihiro Kaneda, Ryosuke Shimizu, Yasuyoshi Mitsumori, Hideo Kosaka, Keiichi Edamatsu

    Progress in Informatics　8　(8)　27-31　2011/03

    Publisher: 国立情報学研究所

    DOI： 10.2201/NiiPi.2011.8.3 　

    ISSN： 1349-8614 1349-8606

  21. Photon pair sources with controlled frequency correlation

    Keiichi Edamatsu, Ryosuke Shimizu, Wakana Ueno, Rui-Bo Jin, Fumihiro Kaneda, Masahiro Yabuno, Hirofumi Suzuki, Shigehiro Nagano, Atsushi Syouji, Koji Suizu

    Progress in Informatics　(8)　19-26　2011

    Publisher: National Institute of Informatics

    DOI： 10.2201/NiiPi.2011.8.2 　

    ISSN： 1349-8606 1349-8614

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Misc. 27

  1. Multiplexed Heralded Single-photon Sources

    金田 文寛

    光学 = Japanese journal of optics : publication of the Optical Society of Japan　47　(2)　60-65　2018/02

    Publisher: 日本光学会

    ISSN： 0389-6625

  2. Towards nondegenerate polarization entanglement from a waveguide down-conversion source

    Kristina A. Meier, Fumihiro Kaneda, Paul G. Kwiat

    Proceedings of SPIE - The International Society for Optical Engineering　10659　2018/01/01

    DOI： 10.1117/12.2306532 　

    ISSN： 0277-786X

  3. Relative time multiplexing of heralded single photons for efficient quantum communication

    Fumihiro Kaneda, Alexander Hill, Paul Kwiat

    2017 Conference on Lasers and Electro-Optics, CLEO 2017 - Proceedings　2017-January　1-2　2017/10/25

    DOI： 10.1364/CLEO_AT.2017.FTh4E.3 　

  4. Synchronized spontaneous downconversion supplies scalable single-photon sources

    P. G. Kwiat, F. Kaneda, F. Bergmann, M. Victora

    Optics InfoBase Conference Papers　Part F43-CLEO_AT 2017　2017/01/01

    DOI： 10.1364/CLEO_AT.2017.JM3E.1 　

  5. Relative time multiplexing of heralded single photons for efficient quantum communication

    Fumihiro Kaneda, Alexander Hill, Paul Kwiat

    Optics InfoBase Conference Papers　Part F42-CLEO_QELS 2017　2017/01/01

    DOI： 10.1364/CLEO_QELS.2017.FTh4E.3 　

  6. Experimental Test of Error, Disturbance,and Uncertainty Relations in Quantum Measurement

    Edamatsu Keiichi, Kaneda Fumihiro, Baek So-Young, Ozawa Masanao

    日本物理学会誌　70　(3)　188-193　2015/03

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 0029-0181

    More details Close

    Experimental test of the error-disturbance uncertainty relations in quantum measurement is described. Using generalized, strength-variable measurement of a single photon polarization state, we demonstrate that the Heisenberg relation is violated, yet the Ozawa and Branciard relations are valid.

  7. Temporal Multiplexing toward Periodic and Deterministic Single-Photon Sources

    F. Kaneda, B. Christensen, J. J. Wong, H. -S. Park, K. McCusker, P. Kwiat

    2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)　2015

    DOI： 10.1364/CLEO_QELS.2015.FM2A.5 　

    ISSN： 2160-9020

  8. Temporal Multiplexing toward Periodic and Deterministic Single-Photon Sources

    F. Kaneda, B. Christensen, J. J. Wong, H. -S. Park, K. McCusker, P. Kwiat

    2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)　2015-August　2015

    ISSN： 2160-9020

  9. Synchronizing heralded single photon sources for efficient quantum communication

    Fumihiro Kaneda, Alexander Hill, Paul Kwiat

    Optics InfoBase Conference Papers　2014/07/21

    DOI： 10.1364/FIO.2016.FF2C.7 　

  10. Experimental test of error-disturbance relations in generalized photon-polarization measurements

    So Young Baek, Fumihiro Kaneda, Masanao Ozawa, Keiichi Edamatsu

    Optics InfoBase Conference Papers　2013/12/01

    Publisher: OSA

    DOI： 10.1364/qim.2013.w6.12 　

  11. Experimental test of error-disturbance uncertainty relations by weak measurements

    Fumihiro Kaneda, So Young Baek, Masanao Ozawa, Keiichi Edamatsu

    Optics InfoBase Conference Papers　2013/12/01

    ISSN： 2162-2701

  12. 束縛量子もつれ光子の生成とその活性化 (特集 量子通信技術)

    枝松 圭一, 金田 文寛, 石坂 智

    光技術コンタクト = Optical and electro-optical engineering contact　51　(5)　28-35　2013/05

    Publisher: 光学工業技術協会

    ISSN： 0913-7289

  13. 偏光に関する一般化測定における測定誤差と擾乱の不確定性関係の実験的評価 III

    金田文寛, BAEK So-Young, 枝松圭一

    日本物理学会講演概要集　68　(1)　2013

    ISSN： 1342-8349

  14. 19pEA-6 Error-Disturbance Uncertainty Relation in Photon Polarization Measurements

    Edamatsu K., Baek So- Young, Kaneda F., Ozawa M.

    Meeting abstracts of the Physical Society of Japan　67　(2)　161-161　2012/08/24

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  15. 偏光に関する一般化測定における測定誤差と擾乱の不確定性関係の実験的評価 II

    金田文寛, BAEK So‐Young, 枝松圭一, 小澤正直

    日本物理学会講演概要集　67　(2)　140-140　2012/08/24

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  16. 偏光に関する一般化測定における測定誤差と擾乱の不確定性関係の実験的評価

    BAEK So‐Young, 金田文寛, 枝松圭一, 小澤正直

    日本物理学会講演概要集　67　(1)　232-232　2012/03/05

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  17. Generation of polarization-entangled photon pairs using two-period quasi-phase matched linbo<inf>3</inf>

    Wakana Ueno, Fumihiro Kaneda, Hirofumi Suzuki, Shigehiro Nagano, Atsushi Syouji, Ryosuke Shimizu, Koji Suizu, Keiichi Edamatsu

    Optics InfoBase Conference Papers　1761-1763　2011/12/01

  18. 24aED-8 Observation of Activation of Bound Entanglement

    Kaneda F., Shimizu R., Ishizaka S., Mitsumori Y., Kosaka H., Edamatsu K.

    Meeting abstracts of the Physical Society of Japan　66　(2)　187-187　2011/08/24

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  19. Generation and superactivation of bound entanglement

    Fumihiro Kaneda, Ryosuke Shimizu, Satoshi Ishizaka, Yasuyoshi Mitsumori, Hideo Kosaka, Keiichi Edamatsu

    2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference, CLEO EUROPE/EQEC 2011　2011

    DOI： 10.1109/CLEOE.2011.5943448 　

  20. Efficient generation and activation of bound entanglement in optical qubits

    Fumihiro Kaneda, Ryosuke Shimizu, Satoshi Ishizaka, Yasuyoshi Mitsumori, Hideo Kosaka, Keiichi Edamatsu

    2011 Int. Quantum Electron. Conf., IQEC 2011 and Conf. Lasers and Electro-Optics, CLEO Pacific Rim 2011 Incorporating the Australasian Conf. Optics, Lasers and Spectroscopy and the Australian Conf.　517-518　2011

    DOI： 10.1109/IQEC-CLEO.2011.6194079 　

  21. Generation and superactivation of bound entanglement

    Fumihiro Kaneda, Ryosuke Shimizu, Satoshi Ishizaka, Yasuyoshi Mitsumori, Hideo Kosaka, Keiichi Edamatsu

    2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference, CLEO EUROPE/EQEC 2011　2011

    DOI： 10.1109/CLEOE.2011.5943448 　

  22. Efficient generation and activation of bound entanglement in optical qubits

    Fumihiro Kaneda, Ryosuke Shimizu, Satoshi Ishizaka, Yasuyoshi Mitsumori, Hideo Kosaka, Keiichi Edamatsu

    2011 Int. Quantum Electron. Conf., IQEC 2011 and Conf. Lasers and Electro-Optics, CLEO Pacific Rim 2011 Incorporating the Australasian Conf. Optics, Lasers and Spectroscopy and the Australian Conf.　517-518　2011

    DOI： 10.1109/IQEC-CLEO.2011.6194079 　

  23. 25pRF-9 Generation of Smolin state using photon polarization qubits

    Kaneda F., Shimizu R., Mitsumori Y., Kosaka H., Edamatsu K.

    Meeting abstracts of the Physical Society of Japan　65　(2)　156-156　2010/08/18

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  24. 25pRF-10 Bell-inequality violation with a brighter independent photon source

    Jin R. B., Shimizu R., Kaneda F., Mitsumori Y., Kosaka H., Edamatsu K.

    Meeting abstracts of the Physical Society of Japan　65　(2)　156-156　2010/08/18

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  25. 20pTD-8 Observation of two-photon quantum beating with two poling period LiNbO_3

    Kaneda F., Suzuki H., Shimizu R., Shouji A., Nagano S., Suizu K., Edamatsu K.

    Meeting abstracts of the Physical Society of Japan　65　(1)　173-173　2010/03/01

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  26. 25pZF-9 Observation of four-photon interference utilizing parametric down-conversion driven by an Yb laser

    Kaneda F., Shimizu R., Mitsumori Y., Kosaka H., Edamatsu K.

    Meeting abstracts of the Physical Society of Japan　64　(2)　63-63　2009/08/18

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  27. 28aSD-3 Efficient generation of multi-photon entangled state by a Yb laser

    Kaneda F., Shimizu R., Mitsumori Y., Kosaka H., Edamatsu K.

    Meeting abstracts of the Physical Society of Japan　64　(1)　149-149　2009/03/03

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

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Books and Other Publications 2

  1. 量子センシングハンドブック : 量子科学が切り拓く新たな領域

    金田文寛, 清水亮介

    エヌ・ティー・エス　2021/03

    ISBN: 9784860436612

  2. Quantum Photonics: Pioneering Advances and Emerging Applications

    Michelle Victora, Fumihiro Kaneda, Fedor Bergmann, Jia Jun Wong, Austin Graf, Paul Kwiat

    Springer　2019/01

Presentations 58

  1. Time Multiplexing for High-Efficiency Generation of Single and Entangled Photons

    Fumihiro Kaneda

    IWSQMD2023　2023/11

  2. 量子コンピュータにおける一般化非破壊完全ベル測定の実証

    Tingrui Dong, Beak Soyoung, 金田文寛, 枝松圭一

    日本物理学会 年次大会　2023/09

  3. Spectrally Pure Heralded Single Photons at Telecommunication O-Band from a Custom-Poled KTiPO4 Crystal

    蔡吾豪, 枝松圭一, 金田文寛

    日本物理学会 年次大会　2023/09

  4. 変調された分極反転KTiOPO4結晶による高不可識別性光子対の発生

    狩野信茂, 枝松圭一, 金田文寛

    日本物理学会 年次大会　2023/09

  5. Pengfei Wang, Electro-optic switch towards polarization-independent single-photon routing II Edamatsu, Fumihiro Kaneda

    Pengfei Wang, Keiichi Edamatsu, Fumihiro Kaneda

    日本物理学会 年次大会　2023/09

  6. Spectrally Pure Heralded Single Photons at Telecommunication O-Band from a Custom-Poled KTiPO4 Crystal

    Wu-Hao Cai, Rui-Bo Jin, Keiichi Edamatsu, Fumihiro Kaneda

    Optica Quantum 2.0 Conference and Exhibition　2023/06

  7. Experimental Single-qubit Variable-strength Measurement Using a Quantum Computer

    Tingrui Dong, Soyoung Baek, Fumihiro Kaneda, Keiichi Edamatsu

    Optica Quantum 2.0 Conference and Exhibition　2023/06

  8. Engineering Spatial Entanglement of Photon Pairs Generated from Parametric Down-Conversion

    Soyoung Baek, Fumihiro Kaneda, Yasuyoshi Mitsumori, Keiichi Edamatsu

    Optica Quantum 2.0 Conference and Exhibition　2023/06

  9. Experimental variable strength measurement using quantum computers

    2022/03

  10. Electro-optic switch toward polarization-independent single-photon routing

    Pengfei Wang, Keiichi Edamatsu, Fumihiro Kaneda

    2022/03

  11. Pure single-photon generation using a domain-engineered nonlinear optical crystal

    FRIS/TI-FRIS annual meeting　2022/02

  12. 時間多重化による量子光源の研究 Invited

    金田文寛

    レーザー学会学術講演会第42回年次大会　2022/01/13

  13. 小さな光子の積み重ね：多重化光子源

    金田文寛

    FRIS Hub meeting　2021/10

  14. Multiplexing for optical quantum applications

    Fumihiro Kaneda

    FRIS Annual Meeting 2021 / 1st TI-FRIS International Symposium　2021/03/23

  15. Study of momentum and position entanglement between photon pairs generated from parametric down-conversion

    Soyoung Baek, Fumihiro Kaneda, Yasuyoshi Mitsumori, Keiichi Edamatsu

    JPS Annual (76th) Meeting　2021/03

  16. 光ファイバーを用いた長周期リング型量子メモリの開発

    金井天馬, 三森康義, 枝松圭一, 金田文寛

    日本物理学会第７６回年次大会　2021/03

  17. 変調された周期分極反転結晶による周波数不可識別伝令付き単一光子対源の開発

    及川憧, 三森康義, 枝松圭一, 金田文寛

    日本物理学会第７６回年次大会　2021/03

  18. 高効率単一光子源，量子もつれ，不確定性関係の研究 Invited

    金田文寛

    日本物理学会第７６回年次大会　2021/03

  19. 時間多重化伝令付き単一光子および多光子源 Invited

    金田文寛

    量子情報技術研究会（QIT）　2020/12

  20. 空間モードフィルタリングによる高精度電気光学スイッチ

    金井天馬, 三森康義, 枝松圭一, 金田文寛

    日本物理学会2020年秋季大会　2020/09

  21. High-Precision Spectral Measurements of Photon-Pair Sources via Frequency-Resolved Sum-Frequency generation

    Fumihiro Kaneda, Jo Oikawa, Yasuyoshi Mitsumori, Keiichi Edamatsu

    Conference on Lasers and Electro-Optics (CLEO) 2020　2020/05

  22. 和周波発生を用いた光子対源の高精度スペクトル特性評価

    及川憧, 金田文寛, 三森康義, 枝松圭一

    日本物理学会第75回年次大会　2020/03

  23. 自発パラメトリック下方変換光子対の高精度位相整合スペクトル評価方法の開発

    及川憧, 金田文寛, 三森康義, 枝松圭一

    レーザー学会学術講演会第40回年次大会　2020/01

  24. High-precision characterization of quantum optical resources via classical measurements International-presentation

    Fumihiro Kaneda, Jo Oikawa, Yasuyoshi Mitsumori, Keiichi Edamatsu

    The 2nd International Forum on Quantum Metrology and Sensing（IFQMS)　2019/12

  25. Time multiplexing for high-efficiency single-photon generation International-presentation

    Fumihiro Kaneda, Paul Kwiat

    The 2nd International Forum on Quantum Metrology and Sensing（IFQMS)　2019/12

  26. Development and characterization of a waveguide SPDC source of highly-nondegenerate polarization-entangled photon pairs International-presentation

    Kristina A. Meier, Fumihiro Kaneda, Paul G. Kwiat

    Single photon workshop 2019　2019/10

  27. High-Efficiency Time-Multiplexed Single-Photon Source International-presentation

    Colin P. Lualdi, Fumihiro Kaneda, Joseph C. Chapman, Paul G. Kwiat

    Single photon workshop　2019/10

  28. High-Efficiency Time-Multiplexed Single-Photon Source International-presentation

    Colin P. Lualdi, Fumihiro Kaneda, Joseph C. Chapman, Paul G. Kwiat

    50th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics APS Meeting　2019/05

  29. Development of highly nondegenerate polarization entanglement on a waveguide SPDC source International-presentation

    Kristina Meier, Fumihiro Kaneda, Paul Kwiat

    50th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics APS Meeting　2019/05

  30. Active time multiplexing for efficient single-photon generation

    Fumihiro Kaneda

    Meeting Abstracts of the Physical Society of Japan　2018/09

  31. Ultra-Efficient Single-Photon Source Via Time Multiplexing International-presentation

    Fumihiro Kaneda, Paul Kwiat

    The International Conference on Quantum Communication, Measurement and Computing (QCMC)　2018/03

  32. Towards nondegenerate polarization entanglement from a waveguide down-conversion source

    Kristina A. Meier, Fumihiro Kaneda, Paul G. Kwiat

    Proceedings of SPIE - The International Society for Optical Engineering　2018/01/01

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    © 2018 SPIE. As optical quantum information processing protocols and experiments become increasingly more complex, integrated optics provide a small and robust alternative to traditional bulk optics. Specifically, waveguide technology allows for the creation of bright single-photon sources based on the fact that photon pairs can be created at any location along the waveguide. For our goals, we are working on the characterization of a highly nondegenerate Spontaneous Parametric Down-Conversion (SPDC) waveguide source on a periodically poled KTP (PPKTP) crystal. Our current waveguide source uses type-II phase-matching to create collinear signal and idler photons at 1550 nm and 810 nm, respectively, with the promise of generating simultaneous time-bin and polarization entanglement in future iterations. Our intended source application is for use in quantum key distribution and superdense teleportation protocols between a space platform and collection telescopes on Earth.

  33. Relative time multiplexing of heralded single photons for efficient quantum communication

    Fumihiro Kaneda, Alexander Hill, Paul Kwiat

    Optics InfoBase Conference Papers　2017/01/01

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    © OSA 2017. We demonstrate relative time multiplexing of heralded single-photon sources, using a low-loss photon storage technique. Our scheme can realize efficient two-photon quantum communication protocols, e.g., measurement-device-independent quantum key distribution.

  34. Synchronized spontaneous downconversion supplies scalable single-photon sources

    P. G. Kwiat, F. Kaneda, F. Bergmann, M. Victora

    Optics InfoBase Conference Papers　2017/01/01

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    © 2017 OSA. Very efficient sources of pure single photons can be realized by combining optimized, heralded nondeterministic photon sources with spatial or temporal multiplexing. Low-loss synchronization elements can further enhance scalability, enabling various multi-photon quantum information applications.

  35. Temporal multiplexing toward periodic and deterministic single-photon sources

    F. Kaneda, B. Christensen, J. J. Wong, H. S. Park, H. S. Park, K. McCusker, K. McCusker, P. Kwiat

    Conference on Lasers and Electro-Optics Europe - Technical Digest　2015/08/10

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    © 2015 OSA. Utilizing time multiplexing of a heralded single-photon source based on spontaneous parametric downconversion pumped by periodic laser pulses, we observed large enhancements in the single-photon probability.

  36. Temporal multiplexing toward periodic and deterministic single-photon sources

    F. Kaneda, B. Christensen, J. J. Wong, H. S. Park, K. McCusker, K. McCusker, P. Kwiat

    CLEO: QELS - Fundamental Science, CLEO_QELS 2015　2015/01/01

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    Utilizing time multiplexing of a heralded single-photon source based on spontaneous parametric downconversion pumped by periodic laser pulses, we observed large enhancements in the single-photon probability. © 2014 Optical Society of America.

  37. Synchronizing heralded single photon sources for efficient quantum communication

    Fumihiro Kaneda, Alexander Hill, Paul Kwiat

    Optics InfoBase Conference Papers　2014/07/21

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    © OSA 2016. We demonstrate synchronized heralded single-photon sources by using a low-loss photon storage technique. Our synchronization scheme can realize efficient two-photon quantum communication protocols, e.g., measurement-device-independent quantum key distribution.

  38. Experimental test of error-disturbance uncertainty relations by weak measurements

    Fumihiro Kaneda, So Young Baek, Masanao Ozawa, Keiichi Edamatsu

    Optics InfoBase Conference Papers　2013/12/01

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    We experimentally test the error-disturbance relations for generalized measurement of photon-polarization by weak measurements. Our results exemplify the violation of Heisenberg's uncertainty relation, yet validates Ozawa's relation. © 2013 Optical Society of America.

  39. Experimental test of error-disturbance relations in generalized photon-polarization measurements

    So Young Baek, Fumihiro Kaneda, Masanao Ozawa, Keiichi Edamatsu

    Optics InfoBase Conference Papers　2013/12/01

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    We report an experimental test of Ozawa's relation for a single-photon polarization qubit, exploiting an indirect measurement model that breaks Heisenberg's relation throughout the range of our experimental parameter and yet validates Ozawa's relation. © 2013 Optical Society of America.

  40. 26aED-5 Experimental Tests of Noise-Disturbance Uncertainty Relations via Generalized Measurements of Photon Polarization III

    Kaneda Fumihiro, Baek So-Young, Edamatsu Keiichi

    Meeting abstracts of the Physical Society of Japan　2013/03/26

  41. 19pEA-6 Error-Disturbance Uncertainty Relation in Photon Polarization Measurements

    Edamatsu K, Baek So- Young, Kaneda F, Ozawa M

    Meeting abstracts of the Physical Society of Japan　2012/08/24

  42. 19aAK-5 Experimental Tests of Noise-Disturbance Uncertainty Relations via Generalized Measurements of Photon Polarization II

    Kaneda Fumihiro, Baek So-Young, Edamatsu Keiichi, Ozawa Masanao

    Meeting abstracts of the Physical Society of Japan　2012/08/24

  43. 19pEA-6 Error-Disturbance Uncertainty Relation in Photon Polarization Measurements

    Edamatsu K, Baek So-Young, Kaneda F, Ozawa M

    Meeting abstracts of the Physical Society of Japan　2012/08/24

  44. 27aBE-10 Experimental Tests of Noise-Disturbance Uncertainty Relations via Generalized Measurements of Photon Polarization

    Baek So-Young, Kaneda Fumihiro, Edamatsu Keiichi, Ozawa Masanao

    Meeting abstracts of the Physical Society of Japan　2012/03/05

  45. Generation and superactivation of bound entanglement

    Fumihiro Kaneda, Ryosuke Shimizu, Ryosuke Shimizu, Satoshi Ishizaka, Yasuyoshi Mitsumori, Hideo Kosaka, Keiichi Edamatsu

    Optics InfoBase Conference Papers　2011/12/01

  46. Efficient generation and activation of bound entanglement in optical qubits

    Fumihiro Kaneda, Ryosuke Shimizu, Satoshi Ishizaka, Yasuyoshi Mitsumori, Hideo Kosaka, Keiichi Edamatsu

    Optics InfoBase Conference Papers　2011/12/01

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    We report the efficient generation of a four-qubit bound entangled Smolin state. We also demonstrate the activation of the bound entanglement; we make the bound entanglement in the Smolin state distillable with the help of an additional Bell pair. © 2011 AOS.

  47. Efficient generation and activation of bound entanglement in optical qubits

    Fumihiro Kaneda, Ryosuke Shimizu, Satoshi Ishizaka, Yasuyoshi Mitsumori, Hideo Kosaka, Keiichi Edamatsu

    2011 Int. Quantum Electron. Conf., IQEC 2011 and Conf. Lasers and Electro-Optics, CLEO Pacific Rim 2011 Incorporating the Australasian Conf. Optics, Lasers and Spectroscopy and the Australian Conf.　2011/12/01

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    We report the efficient generation of a four-qubit bound entangled Smolin state. We also demonstrate the activation of the bound entanglement; we make the bound entanglement in the Smolin state distillable with the help of an additional Bell pair. © 2011 IEEE.

  48. Generation of polarization-entangled photon pairs using two-period quasi-phase matched linbo3

    Wakana Ueno, Fumihiro Kaneda, Hirofumi Suzuki, Shigehiro Nagano, Atsushi Syouji, Ryosuke Shimizu, Koji Suizu, Keiichi Edamatsu

    Optics InfoBase Conference Papers　2011/12/01

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    We demonstrate the generation of polarization-entangled photon pairs at telecommunication wavelengths with type-II quasi-phase matched spontaneous parametric downconversion (QPM-SPDC) having two poling periods. The generated two-photon polarization state was analyzed by the quantum state tomography. © 2011 AOS.

  49. Generation and superactivation of bound entanglement

    Fumihiro Kaneda, Ryosuke Shimizu, Ryosuke Shimizu, Satoshi Ishizaka, Yasuyoshi Mitsumori, Hideo Kosaka, Keiichi Edamatsu

    2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference, CLEO EUROPE/EQEC 2011　2011/09/06

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    We report the experimental realization of the four-partite bound-entangled state, i.e., Smolin state [1] and demonstrate the superactivation of the bound entanglement. Bound entanglement is a class of multipartite entanglement that cannot be distilled into pure entanglement under local operations and classical communication (LOCC). Despite its undistillable property, this class of entanglement has interesting properties that are expected to be useful in quantum information processing (QIP). For instance, in the Smolin state, the bound entanglement can be activated into distillable entanglement when two of the parties get together. The process is called unlocking [1], and has been demonstrated experimentally [2]. More importantly, the bound entanglement can be activated with the help of entanglement in other systems [3]. The activation of bound entanglement, i.e., superactivation, plays an essential role in the QIP protocols using bound entangled states (e.g., remote information concentration [4]). © 2011 IEEE.

  50. 24aED-8 Observation of Activation of Bound Entanglement

    Kaneda F, Shimizu R, Ishizaka S, Mitsumori Y, Kosaka H, Edamatsu K

    Meeting abstracts of the Physical Society of Japan　2011/08/24

  51. 25pRF-9 Generation of Smolin state using photon polarization qubits

    Kaneda F, Shimizu R, Mitsumori Y, Kosaka H, Edamatsu K

    Meeting abstracts of the Physical Society of Japan　2010/08/18

  52. 20pTD-8 Observation of two-photon quantum beating with two poling period LiNbO_3

    Kaneda F, Suzuki H, Shimizu R, Shouji A, Nagano S, Suizu K, Edamatsu K

    Meeting abstracts of the Physical Society of Japan　2010/03/01

  53. 20pTD-8 Observation of two-photon quantum beating with two poling period LiNbO_3

    Kaneda F, Suzuki H, Shimizu R, Shouji A, Nagano S, Suizu K, Edamatsu K

    Meeting Abstracts of the Physical Society of Japan　2010

  54. 25pRF-9 Generation of Smolin state using photon polarization qubits

    Kaneda F, Shimizu R, Mitsumori Y, Kosaka H, Edamatsu K

    Meeting Abstracts of the Physical Society of Japan　2010

  55. 25pZF-9 Observation of four-photon interference utilizing parametric down-conversion driven by an Yb laser

    Kaneda F, Shimizu R, Mitsumori Y, Kosaka H, Edamatsu K

    Meeting abstracts of the Physical Society of Japan　2009/08/18

  56. 28aSD-3 Efficient generation of multi-photon entangled state by a Yb laser

    Kaneda F, Shimizu R, Mitsumori Y, Kosaka H, Edamatsu K

    Meeting abstracts of the Physical Society of Japan　2009/03/03

  57. 28aSD-3 Efficient generation of multi-photon entangled state by a Yb laser

    Kaneda F, Shimizu R, Mitsumori Y, Kosaka H, Edamatsu K

    Meeting Abstracts of the Physical Society of Japan　2009

  58. 25pZF-9 Observation of four-photon interference utilizing parametric down-conversion driven by an Yb laser

    Kaneda F, Shimizu R, Mitsumori Y, Kosaka H, Edamatsu K

    Meeting Abstracts of the Physical Society of Japan　2009

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Research Projects 6

  1. ２光子干渉の一般化と２光子フーリエ分光法の開発

    金田 文寛

    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

    2024/06/28 - 2026/03/31

  2. 多モード多光子発生、検出と高速フーリエ変換による多次元量子計測

    金田 文寛, 藪野 正裕

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 基盤研究(B)

    Category: 基盤研究(B)

    Institution: 東北大学

    2022/04/01 - 2025/03/31

  3. 光子の時間的量子もつれ連鎖と高分解能光量子計測

    金田 文寛

    Offer Organization: 科学技術振興機構

    System: 戦略的な研究開発の推進 戦略的創造研究推進事業 さきがけ

    Institution: 東北大学

    2021 - 2024

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    光計測は現代の科学および産業技術を支える基礎技術のひとつです。本研究では、従来の光計測とは異なり、光の量子である光子を量子もつれによって相関させ、互いに協調的に機能させる高分解能光計測を実証します。この目的達成のため、本研究では量子メモリや量子ゲート技術を駆使し、異なる時間に発生する光子間に量子もつれを着実に連鎖させることで、効率的に量子もつれを大規模化する技術を確立します。

  4. 単一光子の決定論的スイッチングを可能にする光ファイバー内群速度「不整合」カー効果

    金田 文寛

    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: 東北大学

    2021/07/09 - 2023/03/31

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    単一光子は量子情報処理における有力な量子ビット媒体であり、その操作には極限の低損失化、高速化、高精度化が要求されている。しかし、ほぼ全ての光スイッチング素子は、その物理的大きさによって、低損失性か高速性の一方しか達成できていない。本研究では、現在成功的に商用化されている数少ない低損失光閉じ込めデバイスである光ファイバーと、その内部で起こる、高速な光パルスの重なりに基づく全光学的単一光子スイッチングの実証を目標として研究を実施している。 <BR> 本年度では、自由空間から導入されるゲート用レーザー光や単一光子の光ファイバーへの導入及び取り出しを行うための光学系設計と必要機器導入を実施した。光学系は低損失が要求される光通信Oバンドのでの損失を最優先で最適化しながら、ゲート光として利用するCバンドでのファイバー結合も高効率となる光学系を設計し、その必要機器および素子の選定した。また、ファイバー結合光学系構築を開始した。次に、1300 nm帯での単一光子発生手法の検討と、その理論的な性能見積りを実施した。その結果、光子のペアを発生させる自発パラメトリック下方変換における新たな群速度整合条件を発見した。この群速度整合条件は、高い不可識別性をもつ伝令付き単一光子発生を可能にするものであり、本研究の単一光子スイッチングの実証に有用となることがわかった。 <BR> さらに、従来の電気光学スイッチングでは困難であった、偏光状態に依存しない新たな単一光子スイッチング手法を考案し、その原理検証実験に成功した。

  5. Repetition of photon generation and manipulation process for deterministic photon-number manipulation and quantum computing

    Kaneda Fumihiro

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

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

    Institution: Tohoku University

    2019/04/01 - 2022/03/31

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    The scope of the study is to make efficient generation and manipulation of quantum state of light from inefficient processes and components, using repeated process, or time multiplexing. We demonstrated the highest single-photon generation via time-multiplexing technique. Also, we developed a highly pure heralded single-photon source and low-loss, long-life-time optical quantum memories. Our developed techniques and devices will largely improve the efficiency and precision in generation and manipulation of quantum states of light, and will be key components in large-scale single-photon based quantum computing and arbitrary photon number manipulation.

  6. 大規模多重化による単一光子の準決定的生成技術の実現

    金田 文寛

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 研究活動スタート支援

    Category: 研究活動スタート支援

    Institution: 東北大学

    2018/08/24 - 2020/03/31

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    本研究では単体では非効率な伝令付き単一光子源の発生効率を，モード多重化によりほぼ決定的発生を可能にする技術の開発を目指して研究を行っている.多重化伝令付き単一光子源は主に伝令付き単一光子源と光スイッチにより構成されており，それぞれの素子には所望のモードへの低損失かつ高精度な光子の発生・スイッチングが求められる. まず本研究では伝令付き単一光子を正確にシングルモード光ファイバーへ集光するため，光子発生モードの数値計算をベースに光学系を最適化し，その結果，少なくとも90%以上の高効率な伝令付き単一光子の集光が達成された.現在のところ，光子検出器の雑音により集光効率の測定精度が制限されているため，今後検出器の高感度化・低雑音化により，より高精度な測定を行う予定である.また，光子の周波数モードにおける非識別性の高精度測定のため，伝令付き単一光子発生に用いるパラメトリック下方変換の逆過程である和周波発生を用いた新たな分光法を開発した.従来の光子の分光測定方法と比較して，周波数分解能は１桁以上，測定のダイナミックレンジは20dB以上改善され，今後光子の非識別性の最適化を進めていく上で強力な方法となることがわかった.さらに，伝令付き単一光子源用のポンプレーザーの共振器長の安定化を行い，伝令付き単一光子の発生時間モードの安定化を図っている.今後は光スイッチの開発に着手し，それと最適化された伝令付き単一光子源を統合することで多重化の試験を行う予定である.

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