Home Page of Koji Azuma

    Research Scienctist
    NTT Basic Research Laboratories (NTT BRL)
    Optical Science Laboratory
    Theoretical Quantum Physics Research Group
    & Research Center for Theoretical Quantum Physics
    3-1 Morinosato Wakamiya, Atsugi, Kanagawa, 243-0198, Japan
    E-mail: azuma.koji[put "@" here]lab.ntt.co.jp


Biography

Fellowships

Research Interests

Papers
  1. Luca Rigovacca, Go Kato, Stefan Baeuml, M. S. Kim, W. J. Munro, and Koji Azuma,
    "Versatile relative entropy bounds for quantum networks,"
    arXiv:1707.05543.
  2. Kiyoshi Tamaki, Hoi-Kwong Lo, Akihiro Mizutani, Go Kato, Charles Ci Wen Lim, Koji Azuma, and Marcos Curty,
    "Security of quantum key distribution with iterative sifting,"
    Quantum Sci. Technol. 3, 014002 (2017).
    Invited from Focus Issue on Quantum Cryptography and Quantum Networking.
    arXiv:1610.06499.
  3. Stefan Baeuml and Koji Azuma,
    "Fundamental limitation on quantum broadcast networks,"
    Quantum Sci. Technol. 2, 024004 (2017).
    Invited from Focus Issue on Quantum Cryptography and Quantum Networking.
    arXiv:1609.03994.
  4. Koji Azuma and Go Kato,
    "Aggregating quantum repeaters for the quantum internet,"
    Phys. Rev. A 96, 032332 (2017).
    arXiv:1606.00135.
  5. Koji Azuma, Akihiro Mizutani, and Hoi-Kwong Lo,
    "Fundamental rate-loss trade-off for the quantum internet,"
    Nature Communications 7, 13523 (2016).
    Japanese abstract can be found in natureasia.com.
    arXiv:1601.02933.
  6. Koji Azuma, Kiyoshi Tamaki, and William J. Munro,
    "All-photonic intercity quantum key distribution,"
    Nature Communications 6, 10171 (2015).
    Japanese abstract can be found in natureasia.com.
    Press release from NTT on 16th December 2015 (in English and in Japanese).
    arXiv:1408.2884.
  7. William J. Munro, Koji Azuma, Kiyoshi Tamaki, and Kae Nemoto,
    "Inside Quantum Repeaters" (Invited review),
    IEEE J. Sel. Top. Quantum Electrons. 21, 6400813 (2015).
  8. Koji Azuma, Kiyoshi Tamaki, and Hoi-Kwong Lo,
    "All-photonic quantum repeaters,"
    Nature Communications 6, 6787 (2015).
    Japanese abstract can be found in natureasia.com.
    Press release from NTT on 15th April 2015 (in English and in Japanese),
    and from University of Toronto on 15th April 2015.
    arXiv:1309.7207.
  9. Ryo Namiki and Koji Azuma,
    "Quantum Benchmark via an Uncertainty Product of Canonical Variables,"
    Phys. Rev. Lett. 114, 140503 (2015).
    arXiv:1404.2643.
  10. Kiyoshi Tamaki, Marcos Curty, Go Kato, Hoi-Kwong Lo, and Koji Azuma,
    "Loss-tolerant quantum cryptography with imperfect sources,"
    Phys. Rev. A 90, 052314 (2014).
    arXiv:1312.3514.
  11. Masato Koashi, Koji Azuma, Shinya Nakamura, and Nobuyuki Imoto,
    "Does "quantum nonlocality without entanglement" have quantum origin?,"
    arXiv:1303.1269.
  12. Koji Azuma and Go Kato,
    "Optimal entanglement manipulation via coherent-state transmission,"
    Phys. Rev. A 85, 060303(R) (2012).
    arXiv:1108.2747.
  13. Koji Azuma, Hitoshi Takeda, Masato Koashi, and Nobuyuki Imoto,
    "Quantum repeaters and computation by a single module: Remote nondestructive parity measurement,"
    Phys. Rev. A 85, 062309 (2012).
    arXiv:1003.0181.
  14. Koji Azuma, Naoya Sota, Masato Koashi, and Nobuyuki Imoto,
    "Tight bound on coherent-state-based entanglement generation over lossy channels,"
    Phys. Rev. A 81, 022325 (2010).
    arXiv:0908.2735.
  15. Koji Azuma, Naoya Sota, Ryo Namiki, Sahin Kaya Ozdemir, Takashi Yamamoto, Masato Koashi, and Nobuyuki Imoto,
    "Optimal entanglement generation for efficient hybrid quantum repeaters,"
    Phys. Rev. A 80, 060303(R) (2009).
    arXiv:0811.3100.
  16. Koji Azuma, Masato Koashi, and Nobuyuki Imoto,
    "Quantum catalysis of information,"
    arXiv:0804.2426.
  17. Koji Azuma, Masato Koashi, Hosho Katsura and Nobuyuki Imoto,
    "Quantum cloning with nonlocal assistance: Complement of Jozsa's stronger no-cloning theorem,"
    quant-ph/0604009.
  18. Koji Azuma, Junichi Shimamura, Masato Koashi, and Nobuyuki Imoto,
    "Probabilistic cloning with supplementary information,"
    Phys. Rev. A 72, 032335 (2005).
    quant-ph/0505207.
  19. Kazuto Ohshima and Koji Azuma,
    "Proper magnetic fields for nonadiabatic geometric quantum gates in NMR,"
    Phys. Rev. A 68, 034304 (2003).
    quant-ph/0305109.

International Conferences/Workshop Presentations
  1. Koji Azuma,
    "Quantum Network Coding,"
    QCrypt 2017 (Invited),
    Cambridge (UK),
    2017/9/18,
    Video.
  2. Koji Azuma, Akihiro Mizutani, and Hoi-Kwong Lo,
    "Fundamental rate-loss trade-off for the quantum internet,"
    AQIS'17 (Oral),
    Singapole,
    2017/9/8.
  3. Koji Azuma,
    "All-photonic quantum internet,"
    CQIQC-VII (Invited),
    Toronto (Canada),
    2017/8/29,
    Video.
  4. Stefan Baeuml and Koji Azuma,
    "Fundamental limitation on quantum broadcast networks,"
    QIP 2017 (Poster),
    Seattle (USA),
    2017/1/17.
  5. Koji Azuma, Akihiro Mizutani, Hoi-Kwong Lo, and Go Kato,
    "Theory of the quantum internet,"
    QIP 2017 (Poster),
    Seattle (USA),
    2017/1/17.
  6. Koji Azuma,
    "Theory of the quantum internet,"
    Quantum Science Symposium Europe-2016 (Invited),
    Cambridge (UK),
    2016/11/1.
  7. Akihiro Mizutani, Yuichi Nagamatsu, Marcos Curty, Hoi-Kwong Lo, Koji Azuma, Rikizo Ikuta, Takashi Yamamoto, Nobuyuki Imoto, and Kiyoshi Tamaki,
    "Towards Secure QKD with Testable Assumptions on Modulation Devices,"
    QCrypt 2016 (Oral),
    Washington DC (USA),
    2016/9/12.
  8. Stefan Baeuml and Koji Azuma,
    "Multipartite key distribution in networks and multi-commodity flows,"
    AQIS' 16 (Poster),
    Taipei (Taiwan),
    2016/8/28.
  9. William J. Munro, Koji Azuma, and Kiyoshi Tamaki,
    "Intercity quantum networking without repeaters,"
    SPIE Optics + Photonics (Invited),
    San Diego (USA),
    2016/8/28.
  10. Koji Azuma,
    "All-Photonic Quantum Internet without Trusting Measurement Devices,"
    Trustworthy Quantum Information 2016 (Invited),
    Shanghai (China),
    2016/6/30,
    Video.
  11. Stefan Baeuml and Koji Azuma,
    "Bounding multipartite key rate in quantum broadcast networks,"
    13th Central European Quantum Information Processing Workshop (Oral),
    Valtice (Czech Republic),
    2016/6/18.
  12. Koji Azuma, Kiyoshi Tamaki, and Hoi-Kwong Lo,
    "All-photonic quantum repeaters,"
    QCrypt 2015 (Oral),
    Tokyo (Japan),
    2015/9/28,
    Video.
  13. Koji Azuma,
    "All-photonic quantum internet,"
    Physical Sciences Symposia 2015 (Invited),
    Massachusetts (USA),
    2015/9/21.
  14. Koji Azuma,
    "All-photonic quantum repeaters,"
    CQIQC-VI (Poster),
    Toronto (Canada),
    2015/8/18.
  15. Koji Azuma, Kiyoshi Tamaki, and Hoi-Kwong Lo,
    "All photonic quantum repeaters,"
    QIP 2015 (Poster),
    Sydney (Australia),
    2015/1/13.
  16. Koji Azuma,
    "Requisites for long-distance quantum communication,"
    Interdisciplinary Workshop on Quantum Device 2014 (Invited),
    Tokyo (Japan),
    2014/3/27.
  17. Koji Azuma,
    "What is really required in quantum repeaters?,"
    Quantum Science Symposium ASIA-2013 (Invited as a plenary speaker),
    Tokyo (Japan),
    2013/11/25.
  18. Koji Azuma, Masato Koashi, Shinya Nakamura, and Nobuyuki Imoto
    "Classical analog of quantum nonlocality without entanglement,"
    CQIQC-V (Poster),
    Toronto (Canada),
    2013/8/13.
  19. Go Kato, Kiyoshi Tamaki, Koji Azuma, and Masaki Owari
    "Security of CV-QKD with transmitted local oscillator,"
    QCrypt 2013 (Poster),
    Waterloo (Canada),
    2013/8/6.
  20. Koji Azuma,
    "Entanglement shared via coherent-state transmission,"
    Quantum Science Symposium 2012 (Invited),
    Cambridge (UK),
    2012/11/1.
  21. Go Kato and Koji Azuma,
    "Optimal entanglement manipulation via coherent-state transmission,"
    QIP2012 (Poster),
    Montreal (Canada),
    2011/12/12.
  22. Koji Azuma,
    "Quantum repeaters and computation built on a single module,"
    Quantum Science Symposium 2011 (Invited),
    Massachusetts (USA),
    2011/9/27.
  23. Koji Azuma and Go Kato,
    "Optimal coherent-state-based entanglement generation,"
    QIPC2011 (Poster),
    Zurich (Switzerland),
    2011/9/7,9.
  24. Koji Azuma, Hitoshi Takeda, Masato Koashi, and Nobuyuki Imoto,
    "Quantum repeaters and computation by a single module: remote nondestructive parity measurement,"
    QIP2011 (Poster),
    Sentosa (Singapore),
    2011/1/11.
  25. Koji Azuma, Naoya Sota, Masato Koashi, and Nobuyuki Imoto,
    "Optimal bound on coherent-state-based entanglement generation over lossy channels,"
    2nd ICQIT (Poster),
    NII (Japan),
    2010/10/21.
  26. Koji Azuma, Naoya Sota, Masato Koashi, and Nobuyuki Imoto,
    "Tight bound on coherent-state-based entanglement generation over lossy channels,"
    UQCC 2010 (Poster),
    ANA Intercontinental Tokyo (Japan),
    2010/10/19.
  27. Koji Azuma, Hitoshi Takeda, Masato Koashi, and Nobuyuki Imoto,
    "Quantum repeaters and computation by a single module: Remote nondestructive parity measurement,"
    AQIS'10 (Oral),
    University of Tokyo (Japan),
    2010/8/29.
  28. Koji Azuma, Naoya Sota, Ryo Namiki, Sahin Kaya Ozdemir, Takashi Yamamoto, Masato Koashi, and Nobuyuki Imoto,
    "Optimal entanglement generation in hybrid quantum repeaters,"
    Conference on Quantum Information & Quantum Control III (Poster),
    Fields Institute (Canada),
    2009/8/25.
  29. Koji Azuma, Masato Koashi, and Nobuyuki Imoto,
    "Accessing genuinely quantum information without causing disturbance,"
    QIP 2009 (Poster),
    Santa Fe Convention Center (USA),
    2009/1/14.
  30. Koji Azuma, Masato Koashi, and Nobuyuki Imoto,
    "Quantum catalysis of information,"
    International Symposium on Physics of Quantum Technology (Poster),
    Nara Prefectural New Public Hall (Japan),
    2008/11/27.
  31. Koji Azuma,
    "Quantum catalysis of information and its implications,"
    GSIS workshop on quantum information theory (Invited),
    Tohoku University (Japan),
    2008/11/7.
  32. Koji Azuma, Masato Koashi, and Nobuyuki Imoto,
    "Quantum catalysis of information,"
    QCMC 2008 (Poster),
    University of Calgary (Canada),
    2008/8/20.
  33. Koji Azuma, Masato Koashi, and Nobuyuki Imoto,
    "Quantum catalysis of information,"
    APS march meeting (Oral),
    Morial Convention Center (USA),
    2008/3/11.
  34. Koji Azuma, Masato Koashi, Hosho Katsura and Nobuyuki Imoto,
    "Quantum cloning with nonlocal assistance: Complement of Jozsa's stronger no-cloning theorem,"
    Handai Nano Symposium (Poster),
    Osaka University (Japan),
    2007/9/27.
  35. Koji Azuma, Masato Koashi, Hosho Katsura and Nobuyuki Imoto,
    "Quantum cloning with nonlocal assistance: Complement of Jozsa's stronger no-cloning theorem,"
    AQIS 2007 (Oral),
    Shiran Kaikan, Kyoto University (Japan),
    2007/9/4.
  36. Koji Azuma, Masato Koashi, and Nobuyuki Imoto,
    "What kind of assistance enables quantum cloning?,"
    APS march meeting (Oral),
    Colorad Convention Center (USA),
    2007/3/8.
  37. Koji Azuma, Junichi Shimamura, Masato Koashi, and Nobuyuki Imoto,
    "Probabilistic cloning with supplementary information,"
    COE-Kakenhi workshop on quantum information theory and Quantum statistical inference (Oral),
    The University of Tokyo (Japan),
    2005/11/18.
  38. Koji Azuma, Junichi Shimamura, Masato Koashi, and Nobuyuki Imoto,
    "Probabilistic cloning with supplementary information,"
    EQIS 2005 (Poster),
    The National Museum of Emerging Science and Innovation (Japan),
    2005/8/29
  39. Koji Azuma, Junichi Shimamura, Masato Koashi, and Nobuyuki Imoto,
    "Probabilistic cloning with supplementary information,"
    IQEC and CLEO-PR2005 (Poster),
    The Nippon Toshi Center Hotel (Japan),
    2005/7/15.

Internal Conferences/Workshop Presentations
  1. Koji Azuma,
    "Theoretical limit of quantum networks,"
    Meta-X version 3.14 (Invited),
    NAIST (Japan),
    2017/9/29.
  2. Stefan Baeuml and Koji Azuma,
    "Fundamental limitation on quantum broadcast networks,"
    QIT36 (Oral),
    Ritsumeikan University (Japan),
    2017/5/29.
  3. Koji Azuma, Akihiro Mizutani, and Hoi-Kwong Lo,
    "量子インターネットにおける量子通信の理論限界,"
    JPS annual meeting (Oral),
    Osaka University (Japan),
    2017/3/20.
  4. Y. Hasegawa, R. Ikuta, K. Azuma, N. Matsuda, K. Tamaki, H.-K. Lo, T. Yamamoto, and and and N. Imoto
    "時間反転適応的Bell測定の実証,"
    JPS annual meeting (Oral),
    Osaka University (Japan),
    2017/3/19.
  5. Koji Azuma,
    "全光量子インターネット,"
    応用物理学会 応用電子物性分科会「量子通信技術の最前線」 (Invited),
    首都大学東京 秋葉原サテライトキャンパス (Japan),
    2016/12/6.
  6. Koji Azuma and Go Kato,
    "Aggregating quantum repeaters for the quantum internet,"
    QIT35 (Oral),
    KEK (Japan),
    2016/11/24.
  7. Koji Azuma, Akihiro Mizutani, and Hoi-Kwong Lo,
    "Fundamental limitation for quantum communication over the network,"
    QIT34 (Oral),
    Kochi University of Technology (Japan),
    2016/5/30.
  8. Koji Azuma, Kiyoshi Tamaki, and William J. Munro,
    "全光都市間量子鍵配送,"
    JPS annual meeting (Oral),
    Tohoku Gakuin University (Japan),
    2016/3/22.
  9. Kaoru Shimizu, Nobuyuki Matsuda, and Koji Azuma,
    "自然パラメトリック下方変換を用いない超狭線幅伝令付き単一光子光源の構成方法の提案,"
    JPS autumn meeting (Oral),
    Kansai University (Japan),
    2015/9/17.
  10. Koji Azuma,
    "全光化による量子中継の実現:長距離量子通信,"
    The 137th Microoptics Meeting (Invited),
    University of Tokyo (Japan),
    2015/7/31.
  11. Koji Azuma, Kiyoshi Tamaki, and William J. Munro,
    "All-photonic intercity quantum key distribution,"
    QIT32 (Oral),
    Osaka University (Japan),
    2015/5/25.
  12. Koji Azuma, Kiyoshi Tamaki, and Hoi-Kwong Lo,
    "Quantum repeaters with linear optics,"
    QIT31 (Oral),
    Tohoku University (Japan),
    2014/11/18.
  13. Koji Azuma,
    "線型光学素子に基づく量子情報処理,"
    Meta-X version 3.1 (Invited),
    NAIST (Japan),
    2014/10/23.
  14. Koji Azuma, Kiyoshi Tamaki, and Hoi-Kwong Lo,
    "線型光学素子に基づく量子中継,"
    JPS autumn meeting (Oral),
    Chubu University (Japan),
    2014/9/8.
  15. Koji Azuma,
    "Quantum repeaters with linear optics,"
    量子情報の新展開 (Oral),
    Kyoto University (Japan),
    2014/3/25.
  16. Koji Azuma,
    "Does "quantum nonlocality without entanglement" have quantum origin?,"
    3rd Quatuo Meeting (Poster),
    Kochi University of Technology (Japan),
    2014/1/11.
  17. Masato Koashi, Koji Azuma, Shinya Nakamura, and Nobuyuki Imoto,
    "Does "quantum nonlocality without entanglement" have quantum origin?,"
    QIT28 (Oral),
    Hokkaido University (Japan),
    2013/5/27.
  18. Koji Azuma, Shinya Nakamura, Masato Koashi, and Nobuyuki Imoto,
    "Is quantum nonlocality without entanglement really in quantum realms?,"
    JPS annual meeting (Oral),
    Hiroshima University (Japan),
    2013/3/26.
  19. Koji Azuma,
    "遠隔非破壊パリティ測定,"
    2nd Quatuo Meeting (Poster),
    Kochi University of Technology (Japan),
    2013/1/5.
  20. Go Kato and Koji Azuma,
    "Optimal entanglement manipulation via coherent-state transmission,"
    QIT24 (Oral),
    Tokyo Institute of Technology (Japan),
    2012/5/21.
  21. Koji Azuma and Go Kato,
    "コヒーレント状態伝送に基づく最適量子もつれ生成,"
    JPS annual meeting (Oral),
    Kwansei Gakuin University (Japan),
    2012/3/24.
  22. Go Kato and Koji Azuma,
    "ユニタルチャンネルを通じた量子もつれ生成のLOCC限界,"
    JPS annual meeting (Oral),
    Kwansei Gakuin University (Japan),
    2012/3/24.
  23. Koji Azuma,
    "コヒーレント状態伝送量子通信の限界について,"
    1st Quatuo Meeting (Invited),
    Kochi University of Technology (Japan),
    2012/1/8.
  24. Koji Azuma, Hitoshi Takeda, Masato Koashi, and Nobuyuki Imoto,
    "Limits on single-error-type entanglement generation based on coherent states,"
    JPS autumn meeting (Oral),
    University of Toyama (Japan),
    2011/9/21.
  25. Koji Azuma, Hitoshi Takeda, Masato Koashi, and Nobuyuki Imoto,
    "Coherent-state-based entanglement generation via separable operations, local operations and classical communication, and an experimentally-oriented protocol,"
    QIT24 (Oral),
    Tokyo Institute of Technology (Japan),
    2011/5/14.
  26. Koji Azuma, Hitoshi Takeda, Masato Koashi, and Nobuyuki Imoto,
    "Quantum repeaters and computation by remote nondestructive parity measurement,"
    The 5th Interdisciplinary Workshop "Quantum optics in various physical system" (Invited),
    Kyoto Hyatt Regency Hotel (Japan),
    2011/3/22.
  27. Koji Azuma, Hitoshi Takeda, Masato Koashi, and Nobuyuki Imoto,
    "Quantum repeaters and computation by a single module,"
    QIT23 (Oral),
    Tokyo University (Japan),
    2010/11/16.
  28. Koji Azuma, Hitoshi Takeda, Masato Koashi, and Nobuyuki Imoto,
    "Quantum repeaters and computation by a single module,"
    JPS autumn meeting (Oral),
    Osaka Prefecture University (Japan),
    2010/9/23.
  29. Toshiyuki Yamagata, Koji Azuma, Toshiyuki Tashima, Takashi Yamamoto, Masato Koashi, and Nobuyuki Imoto
    "原子集団メモリーを用いた量子リピーターにおける初期化時間の影響,"
    QIT21 (Poster),
    University of Elector-Communications (Japan),
    2009/11/4.
  30. Yoritoshi Adachi, Yuya Kobayashi, Koji Azuma, Takashi Yamamoto, Masato Koashi, and Nobuyuki Imoto
    "エンタングルメントに基づく量子鍵配送における受動基底選択とその効率解析,"
    JPS autumn meeting (Oral),
    Kumamoto University (Japan),
    2009/9/27.
  31. Hitoshi Takeda, Koji Azuma, Naoya Sota, Masato Koashi, and Nobuyuki Imoto
    "Coherent-state-based entanglement generation by middle-point measurement,"
    JPS autumn meeting (Oral),
    Kumamoto University (Japan),
    2009/9/25.
  32. Koji Azuma, Naoya Sota, Masato Koashi, and Nobuyuki Imoto
    "Tight bound on coherent-state-based entanglement generation over lossy channels,"
    JPS autumn meeting (Oral),
    Kumamoto University (Japan),
    2009/9/25.
  33. Hitoshi Takeda, Koji Azuma, Naoya Sota, Masato Koashi, and Nobuyuki Imoto
    "Coherent-state-based entanglement generation by middle-point measurement,"
    Symposium on Atomic, Molecular, and Optical Sciences (Poster),
    Osaka University (Japan),
    2009/6/12.
  34. Koji Azuma, Naoya Sota, Ryo Namiki, Sahin Kaya Ozdemir, Takashi Yamamoto, Masato Koashi, and Nobuyuki Imoto
    "Optimal entanglement generation in hybrid quantum repeaters,"
    Symposium on Atomic, Molecular, and Optical Sciences (Poster),
    Osaka University (Japan),
    2009/6/12.
  35. Koji Azuma, Naoya Sota, Masato Koashi, and Nobuyuki Imoto
    "Tight bound on coherent-state-based entanglement generation over lossy channels,"
    QIT 20 (Oral),
    Hiroshima University (Japan),
    2009/5/21.
  36. Naoya Sota, Koji Azuma, Ryo Namiki, Sahin Kaya Ozdemir, Takashi Yamamoto, Masato Koashi, and Nobuyuki Imoto
    "Optimal entanglement generation for efficient hybrid quantum repeaters,"
    QIT 19 (Oral),
    Osaka Prefecture University (Japan),
    2008/11/21.
  37. Naoya Sota, Koji Azuma, Ryo Namiki, Sahin Kaya Ozdemir, Takashi Yamamoto, Masato Koashi, and Nobuyuki Imoto
    "コヒーレント光を用いた量子メモリー間でのエンタングルメント生成方式の提案,"
    JPS autumn meeting (Oral),
    Iwate University (Japan),
    2008/9/20.
  38. Koji Azuma, Masato Koashi, and Nobuyuki Imoto,
    "Quantum catalysis of information,"
    QIT 18 (Oral),
    The University of Tokyo (Japan),
    2008/5/23.
  39. Koji Azuma, Masato Koashi, and Nobuyuki Imoto,
    "Catalytic impartment and absorption of quantum information,"
    JPS autumn meeting (Oral),
    Hokkaido University (Japan),
    2007/9/24.
  40. Koji Azuma, Masato Koashi, Hosho Katsura and Nobuyuki Imoto,
    "Quantum cloning with nonlocal assistance: Complement of Jozsa's stronger no-cloning theorem,"
    JPS autumn meeting (Oral),
    Chiba University (Japan),
    2006/9/25.
  41. Koji Azuma, Masato Koashi, Hosho Katsura and Nobuyuki Imoto,
    "Quantum cloning with nonlocal assistance,"
    QIT 14 (Poster),
    Ookayama Campus, Tokyo Institute of Technology (Japan),
    2006/5/29.
  42. Koji Azuma, Junichi Shimamura, Masato Koashi, and Nobuyuki Imoto,
    "Probabilistic cloning with supplementary information,"
    JPS annual meeting (Oral),
    Ehime University and Matsuyama University (Japan),
    2006/3/29.
  43. Koji Azuma, Junichi Shimamura, Masato Koashi, and Nobuyuki Imoto,
    "Probabilistic cloning with supplementary information,"
    QIT 12 (Poster),
    NTT Basic Research Laboratories (Japan),
    2005/5/13.

Think Pieces
  1. "【news】高速データ交換による24時間の機密保持,"
    J. L. ミラー著, 東 浩司訳.
    パリティ(丸善出版) 2017年6月号.
  2. "Focus on the News: 盗聴不可能な量子暗号の通信距離を2倍にする新方式を提唱,"
    NTT技術ジャーナル 28 (3), 78-80 (2016).
  3. "ニュース解説: 定説を覆し、長距離量子通信に必要な「量子中継」の全光化手法を確立,"
    電子情報通信学会誌 98 (10), 923-924 (2015).
  4. "Focus on the News: 定説を覆し、長距離量子通信に必要な「量子中継」の全光化手法を確立,"
    NTT技術ジャーナル 27 (6), 60-62 (2015).

Lectures/Seminars
  1. Koji Azuma,
    "All-optical quantum internet,"
    Invited seminar,
    Korea Institue for Advanced Study (KIAS),
    2017/8/9.
  2. Koji Azuma,
    "Quantum repeaters for long distance quantum optical communications,"
    Invited lecture,
    University of Vigo,
    2015/4/8,
    Video.
  3. 東 浩司,
    "コヒーレント状態量子もつれに対する最適変換,"
    第15回 量子情報関東Student Chapter,
    日本大学駿河台キャンパス,
    2012/5/30.
  4. 東 浩司,
    "量子通信の可能性―基礎から現状まで,"
    群馬工業高等専門学校  平成23年度電子メディア工学科講演会,
    群馬工業高等専門学校, 2011/4/26.

Rsearch Visits
  1. University of Toronto (Prof. H.-K. Lo's group) as a visiting researcher,
    2017/8/14-2017/9/1.
  2. Korea Institue for Advanced Study (Prof. S.-W. Lee's group),
    2017/8/6-2017/8/10.
  3. University of Cambridge (Prof. R. Jozsa's group) as a visiting researcher,
    2017/5/8-2017/7/28.
  4. University of Toronto (Prof. H.-K. Lo's group) as a visiting researcher,
    2016/8/1-2016/8/19.
  5. University of Toronto (Prof. H.-K. Lo's group) as a visiting researcher,
    2015/7/15-2015/9/20.
  6. University of Vigo (Assoc. Prof. M. Curty's group),
    2015/4/1-2015/4/10.
  7. University of Toronto (Prof. H.-K. Lo's group) as a visiting researcher,
    2014/7/8-2014-8/15.
  8. University of Toronto (Prof. H.-K. Lo's group) as a visiting researcher,
    2013/7/9-2013/8/24.
  9. University of Toronto (Prof. H.-K. Lo's group) as a visiting researcher,
    2012/7/17-2012/8/28.
  10. Bristol University (Prof. R. Jozsa's group),
    2010/3/1-2010/3/10.

Other Activities
  1. Main research collaborator in the CREST, Japan Science and Technology Agency (JPMJCR1671) (2017-).
  2. Member of the steering committee for "quantum electronics" in division 1 of JPS (2016/10-2017/9).
  3. Member of the organizing committee of QIT33.
  4. Member of 9-10th QIT committee (2014-2018).
  5. Research participant in the ImPACT Program of Council for Science, Technology and Innovation (Cabinet Office, Government of Japan) (2014-2019).
  6. Member of the scientific committee of Quantum Science Symposium Asia-2013.
  7. Member of the organizing committee of 2nd-6th QUATUO meeting (2013-2017).
  8. Research member in the Project UQCC by the National Institute of Information and Communications Technology (NICT) (2011-2015).
  9. Research collaborator in a MEXT Grant-in-Aid for Scientific Research on Innovative Areas (21102008) (2009-2013).

Prizes
  1. NTT Basic Research Laboratories Director Award for the achievement,
    "Proposals of novel concepts in quantum repeaters and quantum key distribution,"
    with K. Tamaki and W. J. Munro,
    2016/3/25.
  2. NTT Basic Research Laboratories Director Award for the paper,
    "Optimal entanglement manipulation via coherent-state transmission,"
    with G. Kato,
    2013/3/25.
  3. Shoji Tanaka prize for the master thesis,
    "Roles of entanglement in quantum operations,"
    from Department of Applied Physics,
    University of Tokyo,
    2007/3/22.

Academic Societies
  1. Phys. Soc. Japan, Member.

Links
  1. NTT Basic Research Laboratories.
  2. Theoretical Quantum Physics Research Group.
  3. Quantum Optical State Control Research Group.