Home Page of Koji Azuma

    Senior Distinguished Researcher
    of NTT Basic Research Laboratories (NTT BRL),
    Group Leader of Theoretical Quantum Physics Research Group
    in Quantum Science and Technology Laboratory,
    & Project Manager of Research Center for Theoretical Quantum Information,
    3-1 Morinosato Wakamiya, Atsugi, Kanagawa, 243-0198, Japan
    E-mail: koji.azuma.ez[put "@" here]hco.ntt.co.jp


Biography
Fellowships
Research Interests
Papers
  1. Shin Sun, Kenneth Goodenough, Daniel Bhatti, Koji Azuma, and David Elkouss,
    "Enhancing distillability of secret keys with entanglement distillation and classical advantage distillation,"
    Phys. Rev. A 112, 052602 (2025).
  2. Shun Kawakami, Atsushi Taniguchi, Yoshihide Tonomura, Koichi Takasugi, and Koji Azuma,
    "Security of the BB84 protocol with passive biased basis choice by the receiver,"
    Phys. Rev. Applied 24, 054070 (2025).
    arXiv:2507.04248.
  3. Tomohiro Yamazaki and Koji Azuma,
    "Linear-Optical Fusion Boosted by High-Dimensional Entanglement,"
    Phys. Rev. Lett. 134, 200801 (2025).
    Press release on 21st May 2025 from NTT in Japanese and in English,
    arXiv:2407.10893.
  4. Koji Azuma,
    "Networking quantum networks with minimum cost aggregation,"
    npj Quantum Information 11, 51 (2025).
    arXiv:2304.08921.
  5. Hsin-Pin Lo, Takuya Ikuta, Koji Azuma, Toshimori Honjo, William J. Munro, and Hiroki Takesue,
    "Generation of a time-bin Greenberger-Horne-Zeilinger state with an optical switch,"
    Quantum Science and Technology 8, 035003 (2023).
    arXiv:2304.05683.
  6. Go Kato, Kiyoshi Tamaki, Masaki Owari, and Koji Azuma,
    "Verifiable homodyne measurement for detecting non-local properties of light,"
    arXiv:2212.10958.
  7. Koji Azuma, Sophia Economou, David Elkouss, Paul Hilaire, Liang Jiang, Hoi-Kwong Lo, and Ilan Tzitrin,
    "Quantum repeaters: From quantum networks to the quantum internet,"
    Rev. Mod. Phys. 95, 045006 (2023).
    arXiv:2212.10820.
  8. Koji Azuma, Nobuyuki Imoto, and Masato Koashi,
    "Optimal supplier of single-error-type entanglement via coherent-state transmission,"
    Phys. Rev. A 105, 062432 (2022).
    arXiv:2203.17116.
  9. Marcos Curty, Koji Azuma, and Hoi-Kwong Lo,
    "A quantum leap in security,"
    Physics Today 74, 3, 36 (2021).
  10. Koji Azuma, Stefan Bäuml, Tim Coopmans, David Elkouss, and Boxi Li,
    "Tools for quantum network design,"
    AVS Quantum Science 3, 014101 (2021) (Featured).
    arXiv:2012.06764.
  11. Koji Azuma and Go Kato,
    "Second law of black hole thermodynamics,"
    arXiv:2001.02897.
  12. Guillermo Currás Lorenzo, Álvaro Navarrete, Koji Azuma, Go Kato, Marcos Curty, and Mohsen Razavi,
    "Tight finite-key security for twin-field quantum key distribution,"
    npj Quantum Information 7, 22 (2021).
    arXiv:1910.11407.
  13. Róbert Trényi, Koji Azuma, and Marcos Curty,
    "Beating the repeaterless bound with adaptive measurement-device-independent quantum key distribution,"
    New J. Phys. 21, 113052 (2019).
    arXiv:1908.04539.
  14. Yasushi Hasegawa, Rikizo Ikuta, Nobuyuki Matsuda, Kiyoshi Tamaki, Hoi-Kwong Lo, Takashi Yamamoto, Koji Azuma, and Nobuyuki Imoto,
    "Experimental time-reversed adaptive Bell measurement towards all-photonic quantum repeaters,"
    Nature Communications 10, 378 (2019).
    Press release on 28th January 2019 from NTT (in English and in Japanese),
    from Osaka University (in English and in Japanese),
    from University of Toyama (in Japanese),
    and from University of Toronto.
  15. Stefan Bäuml, Koji Azuma, Go Kato, and David Elkouss,
    "Linear programs for entanglement and key distribution in the quantum internet,"
    Communications Physics 3, 55 (2020).
    arXiv:1809.03120.
  16. Marcos Curty, Koji Azuma, and Hoi-Kwong Lo,
    "Simple security proof of twin-field type quantum key distribution protocol,"
    npj Quantum Information 5, 64 (2019).
    arXiv:1807.07667.
  17. Koji Azuma, Sathyawageeswar Subramanian, and Go Kato
    "Do black holes store negative entropy?,"
    Prog. Theor. Exp. Phys. 2025, 053A01 (2025).
    arXiv:1807.06753.
  18. Akihiro Mizutani, Go Kato, Koji Azuma, Marcos Curty, Rikizo Ikuta, Takashi Yamamoto, Nobuyuki Imoto, Hoi-Kwong Lo, and Kiyoshi Tamaki,
    "Quantum key distribution with setting-choice-independently correlated light sources,"
    npj Quantum Information 5, 8 (2019).
    arXiv:1803.09484.
  19. Luca Rigovacca, Go Kato, Stefan Bäuml, M. S. Kim, W. J. Munro, and Koji Azuma,
    "Versatile relative entropy bounds for quantum networks,"
    New J. Phys. 20, 013033 (2018).
    arXiv:1707.05543.
  20. 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.
  21. Stefan Bäuml 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.
  22. Koji Azuma and Go Kato,
    "Aggregating quantum repeaters for the quantum internet,"
    Phys. Rev. A 96, 032332 (2017).
    arXiv:1606.00135.
  23. 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.
  24. William J. Munro, Koji Azuma, Kiyoshi Tamaki, and Kae Nemoto,
    "Inside Quantum Repeaters" (Invited review),
    IEEE J. Sel. Top. Quantum Electrons. 21, 6400813 (2015).
  25. 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 on 16th December 2015 from NTT (in English and in Japanese).
    arXiv:1408.2884.
  26. Ryo Namiki and Koji Azuma,
    "Quantum Benchmark via an Uncertainty Product of Canonical Variables,"
    Phys. Rev. Lett. 114, 140503 (2015).
    arXiv:1404.2643.
  27. 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.
  28. 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 on 15th April 2015 from NTT (in English and in Japanese),
    and from University of Toronto.
    arXiv:1309.7207.
  29. Masato Koashi, Koji Azuma, Shinya Nakamura, and Nobuyuki Imoto,
    "Does "quantum nonlocality without entanglement" have quantum origin?,"
    arXiv:1303.1269.
  30. Koji Azuma and Go Kato,
    "Optimal entanglement manipulation via coherent-state transmission,"
    Phys. Rev. A 85, 060303(R) (2012).
    arXiv:1108.2747.
  31. 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.
  32. 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.
  33. Koji Azuma, Naoya Sota, Ryo Namiki, Şahin Kaya Özdemir, 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.
  34. Koji Azuma, Masato Koashi, and Nobuyuki Imoto,
    "Quantum catalysis of information,"
    arXiv:0804.2426.
  35. 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.
  36. Koji Azuma, Junichi Shimamura, Masato Koashi, and Nobuyuki Imoto,
    "Probabilistic cloning with supplementary information,"
    Phys. Rev. A 72, 032335 (2005).
    quant-ph/0505207.
  37. 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 Conference/Workshop Presentations
  1. Koji Azuma,
    "Towards a quantum internet,"
    International Workshop on Quantum Technologies-2025 (IWQT-2025) (Invited),
    Varanasi (India),
    2025/10/13.
  2. Shun Kawakami, Atsushi Taniguchi, Yoshihide Tonomura, Koichi Takasugi, and Koji Azuma,
    "Security of the BB84 Protocol with Receiver's Passive Biased Basis Choice,"
    QKD Security Proof Workshop (Oral),
    Waterloo (Canada),
    2025/9/23.
  3. Tomohiro Yamazaki and Koji Azuma,
    "Leveraging high-dimensional entanglement to boost the success probability of linear-optical fusions,"
    Quantum Optics XI (Poster),
    Kraków (Poland),
    2025/9/2.
  4. Koji Azuma and Tomohiro Yamazaki,
    "Quantum repeaters with linear-optical pairwise fusion gates,"
    SPIE Optics + Photonics 2025 (Invited),
    San Diego (USA),
    2025/8/3.
    Video.
  5. Koji Azuma,
    "All photonics quantum internet,"
    54th Winter Colloquium on the Physics of Quantum Electronics (PQE 2025) (Invited),
    Snowbird (USA),
    2025/1/10.
  6. Tomohiro Yamazaki and Koji Azuma,
    "Linear-optical fusion boosted by high-dimensional entanglement,"
    ISNTT 2024 (Poster),
    Atsugi (Japan),
    2024/12/3.
  7. Koji Azuma,
    "Concatenating quantum networks with minimum-cost aggregation,"
    IMSI Workshop: Quantum Networks (Invited),
    Chicago (USA),
    2024/9/30.
  8. Shun Kawakami, Koji Azuma, Atsushi Taniguchi, Hirokazu Takahashi, and Koichi Takasugi,
    "Security of time-bin encoding BB84 protocol with passive interferometer,"
    QCrypt 2024 (Poster),
    Vigo (Spain),
    2024/9/3, 9/5.
  9. Tomohiro Yamazaki and Koji Azuma,
    "Second-generation quantum repeaters enabled by high-dimensional entanglement,"
    QCrypt 2024 (Poster),
    Vigo (Spain),
    2024/9/3, 9/5.
  10. Koji Azuma,
    "Networking quantum networks with minimum cost aggregation,"
    QCrypt 2024 (Poster),
    Vigo (Spain),
    2024/9/3, 9/5.
  11. Koji Azuma,
    "All-photonic approaches to quantum repeaters,"
    SPIE Optics + Photonics 2024 (Invited),
    San Diego (USA),
    2024/8/18.
    Video.
  12. Tomohiro Yamazaki and Koji Azuma,
    "Linear optical fusion gate onto qubits boosted by high-dimensional entanglement,"
    APS March Meeting 2024 (Oral),
    Minneapolis (USA),
    2024/3/4.
  13. Koji Azuma,
    "Networking quantum networks with minimum cost aggregation,"
    SPIE Photonics West 2024 (Invited),
    San Francisco (USA),
    2024/2/1.
    Video.
  14. Koji Azuma,
    "Minimum-cost aggregation of quantum repeaters,"
    SPIE Optics + Photonics 2023 (Invited),
    San Diego (USA),
    2023/8/21.
    Video.
  15. Koji Azuma,
    "Overcoming the private capacity of optical point-to-point quantum key distribution,"
    2022 Japan-Taiwan Advanced Quantum Technology Research and Development Workshop (Invited),
    Hybrid with Sendai (Japan),
    2022/11/25.
  16. Koji Azuma,
    "Do black holes store negative entropy?,"
    Quantum extreme universe from quantum information (Invited),
    Hybrid with Kyoto (Japan),
    2022/9/28.
    Video.
  17. Koji Azuma,
    "Quantum repeaters for a quantum internet,"
    QCrypt 2022 (Tutorial),
    Hybrid with Taipei (Taiwan),
    2022/9/1.
    Video.
  18. Koji Azuma,
    "Optimal single-error-type entanglement generation via coherent-state transmission,"
    SPIE Optics + Photonics 2022 (Invited),
    San Diego (USA),
    2022/8/22.
    Video.
  19. Koji Azuma,
    "All-optical approaches to quantum repeaters,"
    Third Workshop for Quantum Repeaters and Networks (Invited),
    Chicago (USA),
    2022/8/20.
  20. Hsin-Pin Lo, Takuya Ikuta, Koji Azuma, Toshimori Honjo, William John Munro, and Hiroki Takesue,
    "Three-photon time-bin entanglement generation using an optical switch,"
    CLEO-PR 2022 (Oral),
    Sapporo (Japan),
    2022/8/4.
  21. Koji Azuma,
    "Overcoming the private capacity of optical point-to-point quantum key distribution,"
    SPIE Optics + Photonics 2021 (Invited),
    Online,
    2021/8/1-5,
    Video.
  22. Koji Azuma,
    "Bounding capacities of quantum internet protocols,"
    SPIE Optics + Photonics 2020 (Oral),
    Online,
    2020/8/24-28,
    Video.
  23. Koji Azuma and Sathyawageeswar Subramanian,
    "Do black holes store negative entropy?,"
    APS Virtual April Meeting (Oral),
    Online,
    2020/4/18.
  24. Koji Azuma,
    "Bounding capacities of quantum internet protocols,"
    Workshop on Quantum Networks and Quantum Information (Invited),
    Tokyo (Japan),
    2020/2/20.
  25. Koji Azuma,
    "All-optical quantum internet,"
    ICEQT 2019 (Invited),
    Hefei (China),
    2019/9/16.
  26. Róbert Trényi, Koji Azuma, and Marcos Curty,
    "Beating the repeaterless bound with adaptive measurement-device-independent QKD,"
    QCALL ESR Conference (Oral),
    Palermo (Italy),
    2019/9/16.
  27. Guillermo Currás Lorenzo, Marcos Curty, Koji Azuma, and Mohsen Razavi,
    "Tight finite-key security analysis for twin-field QKD,"
    QCALL ESR Conference (Oral),
    Palermo (Italy),
    2019/9/16.
  28. Rikizo Ikuta, Yasushi Hasegawa, Nobuyuki Matsuda, Kiyoshi Tamaki, Hoi-Kwong Lo, Takashi Yamamoto, Koji Azuma, and Nobuyuki Imoto,
    "Experimental time-reversed adaptive Bell measurement towards all-photonic quantum repeaters,"
    QCrypt 2019 (Poster),
    Montreal (Canada),
    2019/8/28.
  29. Róbert Trényi, Koji Azuma, and Marcos Curty,
    "Beating the repeaterless bound with adaptive measurement-device-independent quantum key distribution,"
    QCrypt 2019 (Poster),
    Montreal (Canada),
    2019/8/26.
  30. Guillermo Currás Lorenzo, Marcos Curty, Koji Azuma, and Mohsen Razavi,
    "Finite-key security analysis of a simple twin-field quantum key distribution protocol,"
    QCrypt 2019 (Poster),
    Montreal (Canada),
    2019/8/26.
  31. Rikizo Ikuta, Yasushi Hasegawa, Nobuyuki Matsuda, Kiyoshi Tamaki, Hoi-Kwong Lo, Takashi Yamamoto, Koji Azuma, and Nobuyuki Imoto,
    "Experimental time-reversed adaptive Bell measurement towards all-photonic quantum repeaters,"
    AQIS 2019 (Oral),
    Seoul (Korea),
    2019/8/23.
  32. Koji Azuma and Sathyawageeswar Subramanian,
    "Do black holes store negative entropy?,"
    Relativistic Quantum Information - North (Oral),
    Tainan (Taiwan),
    2019/5/30.
  33. Stefan Bäuml, Koji Azuma, Go Kato, and David Elkouss,
    "Linear programs for entanglement and key distribution in the quantum internet,"
    QIP 2019 (Poster),
    Boulder (USA),
    2019/1/14.
  34. Koji Azuma,
    "Do black holes store negative entropy?,"
    Quantum Science Symposium Europe-2018 (Invited),
    Cambridge (UK),
    2018/11/5.
  35. Stefan Bäuml, Koji Azuma, Go Kato, and David Elkouss,
    "Linear programs for entanglement and key distribution in the quantum internet,"
    AQIS 2018 (Plenary long talk),
    Nagoya (Japan),
    2018/9/8.
  36. Marcos Curty, Koji Azuma, and Hoi-Kwong Lo,
    "Simple security proof of twin-field type quantum key distribution protocol,"
    QTech 2018 (Oral),
    Paris (France),
    2018/9/5.
  37. Marcos Curty, Koji Azuma and Hoi-Kwong Lo,
    "Simple security proof of twin-field type quantum key distribution protocol,"
    QCrypt 2018 (Poster),
    Shanghai (China),
    2018/8/29.
  38. Luca Rigovacca, Go Kato, Stefan Bäuml, M. S. Kim, W. J. Munro, and Koji Azuma,
    "Versatile relative entropy bounds for quantum networks,"
    QCrypt 2018 (Poster),
    Shanghai (China),
    2018/8/27.
  39. Luca Rigovacca, Go Kato, Stefan Bäuml, M. S. Kim, W. J. Munro, and Koji Azuma,
    "Relative entropy bounds for general quantum networks,"
    Beyond I.I.D. in information theory (Poster),
    Cambridge (UK),
    2018/7/24.
  40. Koji Azuma,
    "Potential of the quantum internet,"
    The Quantum Internet; Charting the Critical Path (Keynote speaker),
    Toronto (Canada),
    2018/6/21.
  41. Koji Azuma,
    "Quantum Network Coding,"
    QCrypt 2017 (Invited),
    Cambridge (UK),
    2017/9/18,
    Video.
  42. Koji Azuma, Akihiro Mizutani, and Hoi-Kwong Lo,
    "Fundamental rate-loss trade-off for the quantum internet,"
    AQIS'17 (Oral),
    Singapole,
    2017/9/8.
  43. Koji Azuma,
    "All-photonic quantum internet,"
    CQIQC-VII (Invited),
    Toronto (Canada),
    2017/8/29,
    Video.
  44. Stefan Bäuml and Koji Azuma,
    "Fundamental limitation on quantum broadcast networks,"
    QIP 2017 (Poster),
    Seattle (USA),
    2017/1/17.
  45. Koji Azuma, Akihiro Mizutani, Hoi-Kwong Lo, and Go Kato,
    "Theory of the quantum internet,"
    QIP 2017 (Poster),
    Seattle (USA),
    2017/1/17.
  46. Koji Azuma,
    "Theory of the quantum internet,"
    Quantum Science Symposium Europe-2016 (Invited),
    Cambridge (UK),
    2016/11/1.
  47. 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.
  48. Stefan Bäuml and Koji Azuma,
    "Multipartite key distribution in networks and multi-commodity flows,"
    AQIS' 16 (Poster),
    Taipei (Taiwan),
    2016/8/28.
  49. William J. Munro, Koji Azuma, and Kiyoshi Tamaki,
    "Intercity quantum networking without repeaters,"
    SPIE Optics + Photonics (Invited),
    San Diego (USA),
    2016/8/28.
  50. Koji Azuma,
    "All-Photonic Quantum Internet without Trusting Measurement Devices,"
    Trustworthy Quantum Information 2016 (Invited),
    Shanghai (China),
    2016/6/30,
    Video.
  51. Stefan Bäuml 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.
  52. Koji Azuma, Kiyoshi Tamaki, and Hoi-Kwong Lo,
    "All-photonic quantum repeaters,"
    QCrypt 2015 (Oral),
    Tokyo (Japan),
    2015/9/28,
    Video.
  53. Koji Azuma,
    "All-photonic quantum internet,"
    Physical Sciences Symposia 2015 (Invited),
    Massachusetts (USA),
    2015/9/21.
  54. Koji Azuma,
    "All-photonic quantum repeaters,"
    CQIQC-VI (Poster),
    Toronto (Canada),
    2015/8/18.
  55. Koji Azuma, Kiyoshi Tamaki, and Hoi-Kwong Lo,
    "All photonic quantum repeaters,"
    QIP 2015 (Poster),
    Sydney (Australia),
    2015/1/13.
  56. Koji Azuma,
    "Requisites for long-distance quantum communication,"
    Interdisciplinary Workshop on Quantum Device 2014 (Invited),
    Tokyo (Japan),
    2014/3/27.
  57. Koji Azuma,
    "What is really required in quantum repeaters?,"
    Quantum Science Symposium ASIA-2013 (Invited as a plenary speaker),
    Tokyo (Japan),
    2013/11/25.
  58. Koji Azuma, Masato Koashi, Shinya Nakamura, and Nobuyuki Imoto,
    "Classical analog of quantum nonlocality without entanglement,"
    CQIQC-V (Poster),
    Toronto (Canada),
    2013/8/13.
  59. 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.
  60. Koji Azuma,
    "Entanglement shared via coherent-state transmission,"
    Quantum Science Symposium 2012 (Invited),
    Cambridge (UK),
    2012/11/1.
  61. Go Kato and Koji Azuma,
    "Optimal entanglement manipulation via coherent-state transmission,"
    QIP2012 (Poster),
    Montreal (Canada),
    2011/12/12.
  62. Koji Azuma,
    "Quantum repeaters and computation built on a single module,"
    Quantum Science Symposium 2011 (Invited),
    Massachusetts (USA),
    2011/9/27.
  63. Koji Azuma and Go Kato,
    "Optimal coherent-state-based entanglement generation,"
    QIPC2011 (Poster),
    Zurich (Switzerland),
    2011/9/7,9.
  64. 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.
  65. 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.
  66. 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.
  67. 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.
  68. Koji Azuma, Naoya Sota, Ryo Namiki, Şahin Kaya Özdemir, Takashi Yamamoto, Masato Koashi, and Nobuyuki Imoto,
    "Optimal entanglement generation in hybrid quantum repeaters,"
    CQIQC III (Poster),
    Fields Institute (Canada),
    2009/8/25.
  69. 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.
  70. 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.
  71. Koji Azuma,
    "Quantum catalysis of information and its implications,"
    GSIS workshop on quantum information theory (Invited),
    Tohoku University (Japan),
    2008/11/7.
  72. Koji Azuma, Masato Koashi, and Nobuyuki Imoto,
    "Quantum catalysis of information,"
    QCMC 2008 (Poster),
    University of Calgary (Canada),
    2008/8/20.
  73. Koji Azuma, Masato Koashi, and Nobuyuki Imoto,
    "Quantum catalysis of information,"
    APS March Meeting (Oral),
    Morial Convention Center (USA),
    2008/3/11.
  74. 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.
  75. 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.
  76. 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.
  77. 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.
  78. 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
  79. 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 Conference/Workshop Presentations
  1. ìã@x, ’JŒû@“Ä, ŠO‘ºŠìG, ‚™kˆê, “Œ@_Ži
    "ŽóMŽÒ‚ªŽó“®“I‚ɕ΂Á‚½Šî’ê‘I‘ð‚ðs‚¤ BB84 ƒvƒƒgƒRƒ‹‚̈À‘S«Ø–¾,"
    QIT53 (Oral),
    NTTŒú–ØŒ¤‹†ŠJ”­ƒZƒ“ƒ^ (Japan),
    2025/12/4.
  2. Shin Sun, Kenneth Goodenough, Daniel Bhatti, Koji Azuma, and David Elkouss,
    "Enhancing Quantum Key Distribution with Entanglement Distillation and Classical Advantage Distillation,"
    QIT52 (Oral),
    ɪ‘åŠw •l¼ƒLƒƒƒ“ƒpƒX (Japan),
    2025/5/29.
  3. Tomohiro Yamazaki and Koji Azuma,
    "Linear-optical fusion boosted by high-dimensional entanglement,"
    QIT51 (Oral),
    ƒTƒ“ƒ|[ƒgƒz[ƒ‹‚¼ (Japan),
    2024/11/28.
  4. ìã@x, “Œ@_Ži, ’JŒû@“Ä, ŠO‘ºŠìG, ‚™kˆê,
    "’x‰„Š±ÂŒv‚ð—p‚¢‚½ƒ^ƒCƒ€ƒrƒ“BB84ƒvƒƒgƒRƒ‹‚̈À‘S«Ø–¾,"
    QIT51 (Poster),
    ƒTƒ“ƒ|[ƒgƒz[ƒ‹‚¼ (Japan),
    2024/11/26.
  5. “Œ _Ži,
    "ŬƒRƒXƒgƒAƒOƒŠƒQ[ƒVƒ‡ƒ“‚ÉŠî‚­—ÊŽqƒlƒbƒgƒ[ƒN˜AÚ,"
    JPS annual meeting (Oral),
    Hokkaido University (Japan),
    2024/9/18.
  6. ŽRú±—F—T, “Œ _Ži
    "‚à‚‚ꂽ—ÊŽqƒrƒbƒg¶¬‚Ì‚½‚ß‚Ì—ÊŽqƒfƒBƒbƒgã‚ÌüŒ`ŒõŠw—Z‡ƒQ[ƒg,"
    JPS annual meeting (Oral),
    Hokkaido University (Japan),
    2024/9/17.
  7. Koji Azuma,
    "Connecting quantum networks with minimum cost aggregation,"
    QIT50 (Oral),
    AIST (Japan),
    2024/5/29.
  8. “Œ _Ži,
    "—ÊŽqƒCƒ“ƒ^[ƒlƒbƒg‚ÉŒü‚¯‚Ä,"
    î•ñˆ—Šw‰ï ‘æ86‰ñ‘S‘‘å‰ï (Invited),
    _“Þì‘åŠw (Japan),
    2024/3/16.
  9. Koji Azuma, Nobuyuki Imoto, and Masato Koashi,
    "Optimal supplier of single-error-type entanglement via coherent-state transmission,"
    JPS annual meeting (Oral),
    Tohoku University (Japan),
    2023/9/18.
  10. Hsin-Pin Lo, Takuya Ikuta, Koji Azuma, Toshimori Honjo, William J. Munro, and Hiroki Takesue,
    "Three-photon time-bin Greenberger-Horne-Zeilinger state generation,"
    ‰ž—p•¨—Šw‰ï H‹GŠwpu‰‰‰ï (Oral),
    Tohoku University (Japan),
    2022/9/20.
  11. Go Kato, Masaki Owari, Kiyoshi Tamaki, and Koji Azuma,
    "Local homodyne/heterodyne measurements,"
    QIT46 (Oral),
    Online,
    2022/5/30.
  12. Koji Azuma and Go Kato,
    "Second law of black hole thermodynamics,"
    JPS annual meeting (Oral),
    Online,
    2022/3/15.
  13. Koji Azuma,
    "Towards a quantum internet,"
    ‰ž—p•¨—Šw‰ï —ÊŽqî•ñHŠwŒ¤‹†‰ï (Invited),
    Online,
    2020/12/15.
  14. Koji Azuma and Go Kato,
    "Second law of black hole thermodynamics,"
    QIT43 (Oral),
    Online,
    2020/12/11.
  15. Marcos Curty, Koji Azuma, and Hoi-Kwong Lo,
    "Simple security proof of twin-field type quantum key distribution protocol,"
    QIT40 (Oral),
    Kyushu University (Japan),
    2019/5/20.
  16. Koji Azuma and Sathyawageeswar Subramanian,
    "Black holes and negative information,"
    JPS annual meeting (Oral),
    Kyushu University (Japan),
    2019/3/16.
  17. Koji Azuma and Sathyawageeswar Subramanian,
    "Black holes and negative information,"
    QIT39 (Oral),
    University of Tokyo (Japan),
    2018/11/27.
  18. Koji Azuma,
    "—ÊŽqƒCƒ“ƒ^[ƒlƒbƒg‚Ì—˜_ŒÀŠE‚Æ–ÊÏ‘¥,"
    —ÊŽqî•ñE•¨«‚ÌV’ª—¬ (Oral),
    “Œ‹ž‘åŠw•¨«Œ¤‹†Š (Japan),
    2018/8/1.
  19. Luca Rigovacca, Go Kato, Stefan Bäuml, M. S. Kim, W. J. Munro, and Koji Azuma,
    "Relative entropy bounds for general quantum networks,"
    QIT38 (Oral),
    International Conference Center Hiroshima (Japan),
    2018/6/4.
  20. Koji Azuma and Go Kato,
    "—ÊŽqƒCƒ“ƒ^[ƒlƒbƒg‚Ì‚½‚ß‚Ì•À—ñ‰»—ÊŽq’†Œp,"
    JPS annual meeting (Oral),
    Tokyo University of Science (Japan),
    2018/3/24.
  21. Koji Azuma,
    "Theoretical limit of quantum networks,"
    Meta-X version 3.14 (Invited),
    NAIST (Japan),
    2017/9/29.
  22. Stefan Bäuml and Koji Azuma,
    "Fundamental limitation on quantum broadcast networks,"
    QIT36 (Oral),
    Ritsumeikan University (Japan),
    2017/5/29.
  23. Koji Azuma, Akihiro Mizutani, and Hoi-Kwong Lo,
    "—ÊŽqƒCƒ“ƒ^[ƒlƒbƒg‚É‚¨‚¯‚é—ÊŽq’ÊM‚Ì—˜_ŒÀŠE,"
    JPS annual meeting (Oral),
    Osaka University (Japan),
    2017/3/20.
  24. Y. Hasegawa, R. Ikuta, K. Azuma, N. Matsuda, K. Tamaki, H.-K. Lo, T. Yamamoto, and and and N. Imoto,
    "ŽžŠÔ”½“]“K‰ž“IBell‘ª’è‚ÌŽÀØ,"
    JPS annual meeting (Oral),
    Osaka University (Japan),
    2017/3/19.
  25. Koji Azuma,
    "‘SŒõ—ÊŽqƒCƒ“ƒ^[ƒlƒbƒg,"
    ‰ž—p•¨—Šw‰ï ‰ž—p“dŽq•¨«•ª‰È‰ïu—ÊŽq’ÊM‹Zp‚ÌÅ‘Oüv (Invited),
    Žñ“s‘åŠw“Œ‹ž H—tŒ´ƒTƒeƒ‰ƒCƒgƒLƒƒƒ“ƒpƒX (Japan),
    2016/12/6.
  26. Koji Azuma and Go Kato,
    "Aggregating quantum repeaters for the quantum internet,"
    QIT35 (Oral),
    KEK (Japan),
    2016/11/24.
  27. 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.
  28. Koji Azuma, Kiyoshi Tamaki, and William J. Munro,
    "‘SŒõ“sŽsŠÔ—ÊŽqŒ®”z‘—,"
    JPS annual meeting (Oral),
    Tohoku Gakuin University (Japan),
    2016/3/22.
  29. Kaoru Shimizu, Nobuyuki Matsuda, and Koji Azuma,
    "Ž©‘Rƒpƒ‰ƒƒgƒŠƒbƒN‰º•û•ÏŠ·‚ð—p‚¢‚È‚¢’´‹·ü•“`—ß•t‚«’PˆêŒõŽqŒõŒ¹‚Ì\¬•û–@‚Ì’ñˆÄ,"
    JPS autumn meeting (Oral),
    Kansai University (Japan),
    2015/9/17.
  30. Koji Azuma,
    "‘SŒõ‰»‚É‚æ‚é—ÊŽq’†Œp‚ÌŽÀŒ»F’·‹——£—ÊŽq’ÊM,"
    The 137th Microoptics Meeting (Invited),
    University of Tokyo (Japan),
    2015/7/31.
  31. Koji Azuma, Kiyoshi Tamaki, and William J. Munro,
    "All-photonic intercity quantum key distribution,"
    QIT32 (Oral),
    Osaka University (Japan),
    2015/5/25.
  32. Koji Azuma, Kiyoshi Tamaki, and Hoi-Kwong Lo,
    "Quantum repeaters with linear optics,"
    QIT31 (Oral),
    Tohoku University (Japan),
    2014/11/18.
  33. Koji Azuma,
    "üŒ^ŒõŠw‘fŽq‚ÉŠî‚­—ÊŽqî•ñˆ—,"
    Meta-X version 3.1 (Invited),
    NAIST (Japan),
    2014/10/23.
  34. Koji Azuma, Kiyoshi Tamaki, and Hoi-Kwong Lo,
    "üŒ^ŒõŠw‘fŽq‚ÉŠî‚­—ÊŽq’†Œp,"
    JPS autumn meeting (Oral),
    Chubu University (Japan),
    2014/9/8.
  35. Koji Azuma,
    "Quantum repeaters with linear optics,"
    —ÊŽqî•ñ‚ÌV“WŠJ (Oral),
    Kyoto University (Japan),
    2014/3/25.
  36. Koji Azuma,
    "Does "quantum nonlocality without entanglement" have quantum origin?,"
    3rd Quatuo Meeting (Poster),
    Kochi University of Technology (Japan),
    2014/1/11.
  37. 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.
  38. 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.
  39. Koji Azuma,
    "‰“Šu”ñ”j‰óƒpƒŠƒeƒB‘ª’è,"
    2nd Quatuo Meeting (Poster),
    Kochi University of Technology (Japan),
    2013/1/5.
  40. Go Kato and Koji Azuma,
    "Optimal entanglement manipulation via coherent-state transmission,"
    QIT24 (Oral),
    Tokyo Institute of Technology (Japan),
    2012/5/21.
  41. Koji Azuma and Go Kato,
    "ƒRƒq[ƒŒƒ“ƒgó‘Ô“`‘—‚ÉŠî‚­œK—ÊŽq‚à‚‚궬,"
    JPS annual meeting (Oral),
    Kwansei Gakuin University (Japan),
    2012/3/24.
  42. Go Kato and Koji Azuma,
    "ƒ†ƒjƒ^ƒ‹ƒ`ƒƒƒ“ƒlƒ‹‚ð’Ê‚¶‚½—ÊŽq‚à‚‚궬‚ÌLOCCŒÀŠE,"
    JPS annual meeting (Oral),
    Kwansei Gakuin University (Japan),
    2012/3/24.
  43. Koji Azuma,
    "ƒRƒq[ƒŒƒ“ƒgó‘Ô“`‘——ÊŽq’ÊM‚ÌŒÀŠE‚ɂ‚¢‚Ä,"
    1st Quatuo Meeting (Invited),
    Kochi University of Technology (Japan),
    2012/1/8.
  44. 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.
  45. 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.
  46. 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.
  47. 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.
  48. 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.
  49. Toshiyuki Yamagata, Koji Azuma, Toshiyuki Tashima, Takashi Yamamoto, Masato Koashi, and Nobuyuki Imoto,
    "Œ´ŽqW’cƒƒ‚ƒŠ[‚ð—p‚¢‚½—ÊŽqƒŠƒs[ƒ^[‚É‚¨‚¯‚鉊ú‰»ŽžŠÔ‚̉e‹¿,"
    QIT21 (Poster),
    University of Elector-Communications (Japan),
    2009/11/4.
  50. Yoritoshi Adachi, Yuya Kobayashi, Koji Azuma, Takashi Yamamoto, Masato Koashi, and Nobuyuki Imoto,
    "ƒGƒ“ƒ^ƒ“ƒOƒ‹ƒƒ“ƒg‚ÉŠî‚­—ÊŽqŒ®”z‘—‚É‚¨‚¯‚éŽó“®Šî’ê‘I‘ð‚Æ‚»‚ÌŒø—¦‰ðÍ,"
    JPS autumn meeting (Oral),
    Kumamoto University (Japan),
    2009/9/27.
  51. 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.
  52. 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.
  53. 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.
  54. Koji Azuma, Naoya Sota, Ryo Namiki, Şahin Kaya Özdemir, 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.
  55. 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.
  56. Naoya Sota, Koji Azuma, Ryo Namiki, Şahin Kaya Özdemir, 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.
  57. Naoya Sota, Koji Azuma, Ryo Namiki, Şahin Kaya Özdemir, Takashi Yamamoto, Masato Koashi, and Nobuyuki Imoto,
    "ƒRƒq[ƒŒƒ“ƒgŒõ‚ð—p‚¢‚½—ÊŽqƒƒ‚ƒŠ[ŠÔ‚ł̃Gƒ“ƒ^ƒ“ƒOƒ‹ƒƒ“ƒg¶¬•ûŽ®‚Ì’ñˆÄ,"
    JPS autumn meeting (Oral),
    Iwate University (Japan),
    2008/9/20.
  58. Koji Azuma, Masato Koashi, and Nobuyuki Imoto,
    "Quantum catalysis of information,"
    QIT 18 (Oral),
    The University of Tokyo (Japan),
    2008/5/23.
  59. Koji Azuma, Masato Koashi, and Nobuyuki Imoto,
    "Catalytic impartment and absorption of quantum information,"
    JPS autumn meeting (Oral),
    Hokkaido University (Japan),
    2007/9/24.
  60. 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.
  61. 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.
  62. 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.
  63. 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. “Œ _Ži,
    "—ÊŽqƒCƒ“ƒ^[ƒlƒbƒgF”­“W‚Ì—ðŽj‚Æ•¨—“IŠî‘b,"
    —ÊŽqƒCƒmƒx[ƒVƒ‡ƒ“ƒnƒ“ƒhƒuƒbƒN.
    rì ‘×•Fi’˜EŠÄCj‚ç.
    ƒGƒkEƒeƒB[EƒGƒX (2026/4/9).
  2. ’Ø“cOŽ÷,
    "—ÊŽqƒCƒ“ƒ^[ƒlƒbƒgŽÀŒ»‚Ö¢ŠE‚ª‚µ‚Ì‚¬ `u—ÊŽq’†Œpv‚Ö2‚‚̓¹‹Ø,"
    ŒŽŠÔƒeƒŒƒRƒ~ƒ…ƒjƒP[ƒVƒ‡ƒ“, 2025”N10ŒŽ†.
  3. "Quantum leaps promise to reshape the internet,"
    nature portfolio.
  4. “Œ _Ži,
    "—ÊŽq‚ª–a‚®V‚½‚È¢ŠEF6D•¨—–@‘¥‰º‚Å‹–‚³‚ê‚鋆‹É‚Ì’ÊMƒlƒbƒgƒ[ƒN@-—ÊŽqƒCƒ“ƒ^[ƒlƒbƒg-,"
    î•ñˆ—, 66(1), e33-e38 (2024-12-15).
  5. “Œ _Ži,
    "–¾“ú‚̃gƒbƒvƒ‰ƒ“ƒi[F’n‹…‹K–Í‚Å‚Ì—ÊŽq’ÊM‚ðŽÀŒ»‚·‚éu—ÊŽqƒCƒ“ƒ^[ƒlƒbƒgv‚Ì‚½‚ß‚Ì—˜_‚ð\’z,"
    NTT‹ZpƒWƒƒ[ƒiƒ‹, ‘æ36Šª, ‘æ8†, 50-53 (2024).
  6. Koji Azuma,
    "Toward a Quantum Internet,"
    NTT Technical Review 21 (6), 53-57 (2023).
  7. “Œ _Ži,
    "—ÊŽqƒCƒ“ƒ^[ƒlƒbƒg‚ÉŒü‚¯‚Ä,"
    NTT‹ZpƒWƒƒ[ƒiƒ‹, ‘æ35Šª, ‘æ4†, 36-39 (2023).
  8. William John Munro, Victor M. Bastidas, Koji Azuma, Kae Nemoto,
    "Designing Quantum Computers,"
    NTT Technical Review 19 (5), 29-33 (2021).
  9. William John Munro, Victor M. Bastidas, “Œ _Ži, ª–{ŠG,
    "—ÊŽqƒRƒ“ƒsƒ…[ƒ^‚ÌÝŒv‚ÉŒü‚¯‚Ä,"
    NTT‹ZpƒWƒƒ[ƒiƒ‹, ‘æ33Šª, ‘æ3†, 30-36 (2021).
  10. “Œ _Ži,
    "—ÊŽqƒCƒ“ƒ^[ƒlƒbƒg‚ÉŒü‚¯‚Ä,"
    ƒtƒHƒgƒjƒNƒXƒjƒ…[ƒX, ‘æ6Šª, ‘æ3†, 91-96 (2020),
    ‰ž—p•¨—Šw‰ïƒtƒHƒgƒjƒNƒX•ª‰È‰ï.
    PDF.
  11. "CS16 ‘SŒõ—ÊŽq’†Œp•ûŽ®‚É‚æ‚é—ÊŽq’†Œp‚ÌŒ´—ŒŸØ,"
    IOWN\‘z \ƒCƒ“ƒ^[ƒlƒbƒg‚Ìæ‚Ö.
    àV“c ƒ (’˜), ˆäˆÉ Šî”V (’˜), ì“Y —Y•F (’˜).
    NTToӁ (2019/11/22).
  12. "Short Reports: First Proof-of-principle Experiment of Quantum Repeaters with All Photonics—Major Step towards a Quantum Internet as the Holy Grail of Information-processing Networks,"
    NTT Technical Review 17 (7), 44-46 (2019).
  13. "Focus on the News: u‘SŒõv‚Å—ÊŽq’†Œp‚ÌŒ´—ŒŸØŽÀŒ±‚ɬŒ÷\‹†‹É‚Ìî•ñˆ—ƒlƒbƒgƒ[ƒNu—ÊŽqƒCƒ“ƒ^[ƒlƒbƒgvŽÀŒ»‚Ö‚Ì‘æˆê•à,"
    NTT‹ZpƒWƒƒ[ƒiƒ‹ 31 (6), 50-52 (2019).
  14. "ƒjƒ…[ƒX‰ðà: u‘SŒõv‚Å—ÊŽq’†Œp‚ÌŒ´—ŒŸØŽÀŒ±‚ɬŒ÷\‹†‹É‚Ìî•ñˆ—ƒlƒbƒgƒ[ƒNu—ÊŽqƒCƒ“ƒ^[ƒlƒbƒgvŽÀŒ»‚Ö‚Ì‘æˆê•à,"
    “dŽqî•ñ’ÊMŠw‰ïŽ 102 (6), 593-594 (2019).
  15. Koji Azuma,
    "Journey towards the quantum internet,"
    De Physicus, January 2019, 52-54 (edited by Maia Rigot).
    PDF.
  16. "ynewsz‚‘¬ƒf[ƒ^ŒðŠ·‚É‚æ‚é24ŽžŠÔ‚Ì‹@–§•ÛŽ,"
    J. L. ƒ~ƒ‰[’˜, “Œ _Ži–ó.
    ƒpƒŠƒeƒBiŠÛ‘Po”Åj 2017”N6ŒŽ†.
  17. "Focus on the News: “’®•s‰Â”\‚È—ÊŽqˆÃ†‚Ì’ÊM‹——£‚ð2”{‚É‚·‚éV•ûŽ®‚ð’ñ¥,"
    NTT‹ZpƒWƒƒ[ƒiƒ‹ 28 (3), 78-80 (2016).
  18. "ƒjƒ…[ƒX‰ðà: ’èà‚𕢂µA’·‹——£—ÊŽq’ÊM‚É•K—v‚Èu—ÊŽq’†Œpv‚Ì‘SŒõ‰»Žè–@‚ðŠm—§,"
    “dŽqî•ñ’ÊMŠw‰ïŽ 98 (10), 923-924 (2015).
  19. "Focus on the News: ’èà‚𕢂µA’·‹——£—ÊŽq’ÊM‚É•K—v‚Èu—ÊŽq’†Œpv‚Ì‘SŒõ‰»Žè–@‚ðŠm—§,"
    NTT‹ZpƒWƒƒ[ƒiƒ‹ 27 (6), 60-62 (2015).

Lectures/Seminars
  1. “Œ _Ži,
    "—ÊŽqƒCƒ“ƒ^[ƒlƒbƒgF•¨—–@‘¥‰º‚Ì‹†‹É‚Ì’ÊMƒlƒbƒgƒ[ƒN,"
    R forum,
    –L“c’†‰›Œ¤‹†Š.
    2025/12/11.
  2. Koji Azuma,
    "Towards a quantum internet,"
    Okinawa School in Physics: From quantum key distribution to the quantum internet (OSP2025),
    OIST.
    2025/9/22.
  3. “Œ _Ži,
    "•¨—–@‘¥‰º‚Å‹–‚³‚ê‚鋆‹É‚Ì’ÊMƒlƒbƒgƒ[ƒNF—ÊŽqƒCƒ“ƒ^[ƒlƒbƒg,"
    —ߘa7”N“x ‘æ6‰ñ—ÊŽq‹ZpŒ¤‹†‰ï,
    ‰ÈŠw‹Zp‚ÆŒoς̉ï.
    2025/8/25.
  4. Koji Azuma,
    "Quantum solutions for secure communication,"
    EU Pavillion at EXPO 2025,
    Osaka.
    2025/8/9-10.
  5. “Œ _Ži,
    "—ÊŽqƒCƒ“ƒ^[ƒlƒbƒg‚ÉŒü‚¯‚Ä,"
    —ÊŽqƒ}ƒeƒŠƒAƒ‹EƒfƒoƒCƒXEƒZƒ“ƒVƒ“ƒO•”‰ïu‰‰‰ï,
    Q-STAR.
    2025/5/27.
  6. “Œ _Ži,
    "‘SŒõ—ÊŽqƒCƒ“ƒ^[ƒlƒbƒg,"
    —ÊŽqƒCƒ“ƒ^[ƒlƒbƒg‚Æ—ÊŽqî•ñ—˜_i‘æ14‰ñu‹`j,
    Œcœä‹`m‘åŠw,
    2025/1/16.
  7. Koji Azuma,
    "What is a quantum internet?,"
    10th BRL School,
    NTT Basic Research Laboratories,
    2024/12/3.
  8. “Œ _Ži,
    "—ÊŽq’ÊM‚ÌŠî‘b‚©‚牞—p‚Ü‚Å,"
    •¨—HŠw“Á•Êu‹`‘æŽli•¨—HŠw“Á•Êu‹`IVj,
    “Œ‹ž‘åŠw‘åŠw‰@HŠwŒnŒ¤‹†‰È•¨—HŠwêUi“Œ‹ž‘åŠwHŠw•”•¨—HŠw‰Èj,
    2024/9/11-13.
  9. “Œ _Ži,
    "—ÊŽqƒCƒ“ƒ^[ƒlƒbƒg‚ÉŒü‚¯‚Ä,"
    •W€‰»“®ŒüˆÓŒ©ŒðŠ·‰ï,
    ’´‚‘¬ƒtƒHƒgƒjƒbƒNƒlƒbƒgƒ[ƒNŠJ”­„i‹¦‹c‰ïiPIFj.
    2024/2/27.
  10. “Œ _Ži,
    "—ÊŽqî•ñ’ÊM,"
    IEICEæ’[ƒZƒ~ƒi[,
    “dŽqî•ñ’ÊMŠw‰ï.
    2024/2-.
  11. “Œ _Ži,
    "—ÊŽqƒCƒ“ƒ^[ƒlƒbƒg‚ÉŒü‚¯‚Ä,"
    ŒÅ‘Ì•¨—ƒZƒ~ƒi[^‘æˆê‰ñQIQBƒZƒ~ƒi[,
    ‘åã‘åŠw‘åŠw‰@Šî‘bHŠwŒ¤‹†‰È,
    2022/10/26.
  12. “Œ _Ži,
    "—ÊŽqî•ñŠî‘b˜_,"
    •¨«•¨—HŠw“Á•Êu‹`II (W’†u‹`),
    ‘åã‘åŠw‘åŠw‰@Šî‘bHŠwŒ¤‹†‰È,
    2022/10/24-26.
  13. “Œ _Ži,
    "—ÊŽqî•ñ‚Æ—ÊŽqƒCƒ“ƒ^[ƒlƒbƒg,"
    ‘æ67‰ñ•¨«ŽáŽè‰Ä‚ÌŠwZiu‹`j,
    ƒIƒ“ƒ‰ƒCƒ“,
    2022/8/3-5.
    u‹`ƒm[ƒg.
  14. “Œ _Ži,
    "—ÊŽqî•ñ—˜_‚ÆŽ„,"
    ã‘å QIQB ‚Å—ÊŽqƒlƒCƒeƒBƒu‚ɂȂ낤 (Invited),
    ƒIƒ“ƒ‰ƒCƒ“,
    2021/3/30.
  15. “Œ _Ži,
    "—ÊŽq’ÊM‚Æ—ÊŽqƒCƒ“ƒ^[ƒlƒbƒg,"
    —ÊŽqî•ñt‚ÌŠwZ2021 (Invited),
    ƒIƒ“ƒ‰ƒCƒ“,
    2021/3/28.
  16. Koji Azuma,
    "Quantum repeaters and computation built on a single module,"
    CREST Seminar #6 (for the team of Prof. T. Aoki),
    Invited seminar,
    Meiji University,
    2019/8/6.
  17. Koji Azuma,
    "Journey towards the quantum internet,"
    Quantum Internet Task Force (Tutorial seminar),
    Invited seminar,
    Roppongi Hills,
    2019/8/5.
  18. “Œ _Ži,
    "ƒuƒ‰ƒbƒNƒz[ƒ‹‚Ì–ÊÏ‚Æ•‰‚Ìî•ñ,"
    —ߘaŒ³”N“x ‘æ2‰ñ ŒÅ‘Ì•¨—ƒZƒ~ƒi[ (Invited),
    ‘åã‘åŠw–L’†ƒLƒƒƒ“ƒpƒX,
    2019/6/6.
  19. Koji Azuma and Sathyawageeswar Subramanian,
    "Do black holes store negative entropy?,"
    QIQB seminar (Invited),
    Osaka University,
    2019/3/25.
  20. Koji Azuma,
    "All-photonic quantum internet,"
    CREST Seminar #4 (for the team of Prof. T. Aoki),
    Invited seminar,
    Meiji University,
    2018/7/19.
  21. Koji Azuma,
    "Why is NTT interested in quantum technology?,"
    Invited lecture,
    University of Vigo,
    2018/4/19.
  22. “Œ _Ži,
    "—ÊŽqî•ñŠî‘b˜_,"
    •¨«—˜_“Á˜_II (W’†u‹`),
    ’}”g‘åŠw,
    2017/12/12-12/14.
  23. “Œ _Ži,
    "‘SŒõ—ÊŽqƒCƒ“ƒ^[ƒlƒbƒg,"
    ‘æ23‰ñ —ÊŽqî•ñŠÖ¼Student Chapter (Invited),
    ‘åã‘åŠw–L’†ƒLƒƒƒ“ƒpƒX,
    2017/11/30.
  24. Koji Azuma,
    "All-optical quantum internet,"
    Invited seminar,
    Korea Institue for Advanced Study (KIAS)C
    2017/8/9.
  25. Koji Azuma,
    "Quantum repeaters for long distance quantum optical communications,"
    Invited lecture,
    University of Vigo,
    2015/4/8,
    Video.
  26. “Œ _Ži,
    "ƒRƒq[ƒŒƒ“ƒgó‘Ô—ÊŽq‚à‚‚ê‚ɑ΂·‚éÅ“K•ÏŠ·,"
    ‘æ15‰ñ —ÊŽqî•ñŠÖ“ŒStudent Chapter (Invited),
    “ú–{‘åŠwx‰Í‘äƒLƒƒƒ“ƒpƒX,
    2012/5/30.
  27. “Œ _Ži,
    "—ÊŽq’ÊM‚̉”\«\Šî‘b‚©‚猻ó‚Ü‚Å,"
    ŒQ”nH‹Æ‚“™ê–åŠwZ  •½¬23”N“x“dŽqƒƒfƒBƒAHŠw‰Èu‰‰‰ï (Invited),
    ŒQ”nH‹Æ‚“™ê–åŠwZ,
    2011/4/26.

Research Visits
  1. University of Toronto (Prof. H.-K. Lo's group),
    2024/8/20-2024/8/23.
  2. University of Toronto (Prof. H.-K. Lo's group),
    2023/8/25-2023/8/31.
  3. University of Toronto (Prof. H.-K. Lo's group),
    2019/6/10-2019/6/21.
  4. University of Vigo (Assoc. Prof. M. Curty's group),
    2018/4/10-2018/4/24.
  5. University of Toronto (Prof. H.-K. Lo's group) as a visiting researcher,
    2017/8/14-2017/9/1.
  6. Korea Institue for Advanced Study (Prof. S.-W. Lee's group),
    2017/8/6-2017/8/10.
  7. University of Cambridge (Prof. R. Jozsa's group) as a visiting researcher,
    2017/5/8-2017/7/28.
  8. University of Toronto (Prof. H.-K. Lo's group) as a visiting researcher,
    2016/8/1-2016/8/19.
  9. University of Toronto (Prof. H.-K. Lo's group) as a visiting researcher,
    2015/7/15-2015/9/20.
  10. University of Vigo (Assoc. Prof. M. Curty's group),
    2015/4/1-2015/4/10.
  11. University of Toronto (Prof. H.-K. Lo's group) as a visiting researcher,
    2014/7/8-2014-8/15.
  12. University of Toronto (Prof. H.-K. Lo's group) as a visiting researcher,
    2013/7/9-2013/8/24.
  13. University of Toronto (Prof. H.-K. Lo's group) as a visiting researcher,
    2012/7/17-2012/8/28.
  14. Bristol University (Prof. R. Jozsa's group),
    2010/3/1-2010/3/10.

Other Activities
  1. Vice track chair of Quantum Innovation 2026.
  2. Member of the CLEO 2026 Fundamental Science 2 committee: Quantum Information and Communication.
  3. Technical program committe member of International Conference on Quantum Communications, Networking, and Computing (QCNC 2026).
  4. Member of the program committee of 25th Asian Quantum Information Science Conference (AQIS 2025).
  5. Chair of the organizing committee of QIT53.
  6. Committee member of Quantum Innovation 2025.
  7. Member of the CLEO 2025 Fundamental Science 2 committee: Quantum Information and Communication.
  8. Chair of the program committee of ISNTT 2024.
  9. Part-Time Lecturer in Department of Applied Physics, Graduate School of Engineering, The University of Tokyo (2024/4/1-2024/12/31).
  10. Member of the program committee of 24rd Asian Quantum Information Science Conference (AQIS 2024).
  11. Committee member of Quantum Innovation 2024.
  12. ‘–±Èu—ÊŽqƒCƒ“ƒ^[ƒlƒbƒgŽÀŒ»‚ÉŒü‚¯‚½—v‘f‹Zp‚ÌŒ¤‹†ŠJ”­v Œ¤‹†•ª’SŽÒ (2023/10-).
  13. Associate editor of Optica Quantum (2023/6/25-).
  14. Member of the program committee of 23rd Asian Quantum Information Science Conference (AQIS 2023).
  15. External Secondment Supervisor of a Marie Skłodowska-Curie Doctoral Network, "Quantum-Safe Internet" (101072637) (2022/10/1-2026/9/30).
  16. Part-Time Lecturer in Graduate School of Engineering Science, Osaka University (2022/10/1-2023/3/31).
  17. —ÊŽq‹ZpƒCƒmƒx[ƒVƒ‡ƒ“í—ª‚Ìí—ªŒ©’¼‚µŒŸ“¢ƒ[ƒLƒ“ƒOƒOƒ‹[ƒv \¬ˆõ (2021/10-2022/3).
  18. Co-Investigator of Grant-in-Aid for Transformative Research Areas (A) (21H05183) (2021/10-).
  19. Member of the program committee of ISNTT 2021.
  20. Performer of the Moonshot Research and Development Program (Goal 6), Japan Science and Technology Agency (JPMJMS2061) (2020/12-).
  21. IOP trusted reviewer status (2020/9/23).
  22. Co-chair of the 12th QIT steering committee (2020/6-2022/6).
  23. Member of the program committee of 19th Asian Quantum Information Science Conference (AQIS 2019).
  24. The PRESTO, Japan Science and Technology Agency (JPMJPR1861) (2018/10-).
  25. Member of the scientific committee of Quantum Science Symposium Europe-2018.
  26. Part-Time Lecturer in Graduate School of Pure and Applied Sciences, University of Tsukuba (2017/12/1-2018/3/31).
  27. Research Participant in the CREST, Japan Science and Technology Agency (JPMJCR1671) (2016/10-2017/3 and 2018/10-).
  28. Lead Joint Researcher in the CREST, Japan Science and Technology Agency (JPMJCR1671) (2017/4-2018/9).
  29. Member of the steering committee for "quantum electronics" in division 1 of JPS (2016/10-2017/9).
  30. Member of the organizing committee of QIT33.
  31. Member of 9-13th QIT committee (2014-2024).
  32. Research Participant in the ImPACT Program of Council for Science, Technology and Innovation (Cabinet Office, Government of Japan) (2014-2019).
  33. Member of the scientific committee of Quantum Science Symposium Asia-2013.
  34. Member of the organizing committee of 2nd-12th QUATUO meeting (2013-2026).
  35. Research Member in the Project UQCC by the National Institute of Information and Communications Technology (NICT) (2011-2015).
  36. 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 foundational protocols for high-performance quantum communication and computation,"
    with Go Kato, Stefan Bäuml, Takuya Hatomura, Victor Bastidas, and William J. Munro,
    2024/3/28.
  2. Electronics Society Activity Testimonial, Electronics Society of the IEICE,
    "Contribution as a co-chair of the 12th QIT steering committee,"
    2023/3/7.
  3. The Commendation for Science and Technology by the Minister of Education, Culture, Sports, Science and Technology of Japan,
    The Young Scientists' Prize,
    "Theoretical study of quantum repeaters towards a quantum internet,"
    2022/4/8.
  4. NTT Science and Core Technology Laboratory Group Director Award for the Research and Development,
    "Proposals and demonstrations of quantum communication and simulation for quantum leaps,"
    with Victor Bastidas, Yanbao Zhang, and William J. Munro,
    2019/12/11.
  5. NTT Basic Research Laboratories Director Award for the Achievement,
    "Proposals of novel concepts in quantum repeaters and quantum key distribution,"
    with Kiyoshi Tamaki and William J. Munro,
    2016/3/25.
  6. NTT Basic Research Laboratories Director Award for the Paper,
    "Optimal entanglement manipulation via coherent-state transmission,"
    with G. Kato,
    2013/3/25.
  7. Shoji Tanaka Prize for the Master Thesis,
    "Roles of entanglement in quantum operations,"
    from the 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. NTT Research Center for Theoretical Quantum Information.
  4. Quantum Optical State Control Research Group.