Quantum information processing based on complementarity in quantum mechanics

• Project/Area Number: 20540389
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Atomic/Molecular/Quantum electronics
• Research Institution: Osaka University
• Principal Investigator: KOASHI Masato Osaka University, 大学院・基礎工学研究科, 准教授 (90322099)
• Project Period (FY): 2008 – 2010
• Project Status: Completed (Fiscal Year 2010)
• Budget Amount: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000); Fiscal Year 2010: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2009: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000); Fiscal Year 2008: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
• Keywords: 相補性 / 量子暗号 / 量子鍵配送 / 量子もつれ / DPS-QKD / 6状態量子暗号方式 / BB84方式 / 光子分離攻撃 / 単一光子光源 / 光子統計 / 量子中継器 / DFS

Research Abstract

Theory on the security of quantum key distribution (QKD) protocols based on complementarity in quantum mechanics has been developed. This method is applicable to any QKD protocols in principle. Security proofs were provided for several QKD protocols with practical devices. Quantitative relations among various properties of quantum origin (quantum entanglement, private communication, and complementarity) were revealed through derivation of universal equations connecting the measures of quantum correlation defined operationally in terms of those properties.

Research Products

• [Journal Article] Efficient Decoherence-Free Entanglement Distribution over Lossy Quantum Channels (2011)
  • Author(s): R.Ikuta, Y.Ono, T.Tashima, T.Yamamoto, M.Koashi, N.
  • Journal Title: Physical Review Letters Vol.106
  • Peer Reviewed
• [Journal Article] Efficient Decoherence-Free Entanglement Distribution over Lossy Quantum Channels (2011)
  • Author(s): Rikizo Ikuta, Masato Koashi, et al.
  • Journal Title: Physical Review Letters Volume: 106
  • Peer Reviewed
• [Journal Article] Optimal local expansion of W states using linear optics and Fock states (2011)
  • Author(s): Rikizo Ikuta, Masato Koashi, et al.
  • Journal Title: Physical Review A Volume: 83
  • Peer Reviewed
• [Journal Article] Optimal local expansion of W states using linear optics and Fock states (2010)
  • Author(s): R.Ikuta, T.Tashima, T.Yamamoto, M.Koashi, N.Imoto
  • Journal Title: Physical Review A Vol.83
  • Peer Reviewed
• [Journal Article] Demonstration of Local Expansion Toward Large-Scale Entangled Webs (2010)
  • Author(s): T.Tashima, T.Kitano, S.K.Ozdemir, M.Koashi, N.Imoto
  • Journal Title: Physical Review Letters Vol.105
  • Peer Reviewed
• [Journal Article] Tight bound on coherent-state-based entanglement generation over lossy channels (2010)
  • Author(s): K.Azuma, N.Sota, M.Koashi, N.Imoto
  • Journal Title: Physical Review A Vol.81
  • Peer Reviewed
• [Journal Article] Demonstration of local expansion toward large-scale entangled webs (2010)
  • Author(s): Toshiyuki Tashima, Masato Koashi, et al.
  • Journal Title: Physical Review Letters Volume: 105
  • Peer Reviewed
• [Journal Article] Tight bound on coherent-state-based entanglement generation over lossy channels (2010)
  • Author(s): Koji Azuma, et al.
  • Journal Title: Phsical Review A 81
  • Peer Reviewed
• [Journal Article] Optimal entanglement generation for efficient hybrid quantum repeaters (2009)
  • Author(s): K.Azuma, N.Sota, R.Namiki, S.K.Ozdemir, T.Yamamoto, M.Koashi, N.Imoto
  • Journal Title: Physical Review A Vol.80
  • Peer Reviewed
• [Journal Article] Boosting up quantum key distribution by learning statistics of practical single-photon sources (2009)
  • Author(s): Y.Adachi, T.Yamamoto, M.Koashi, N.Imoto
  • Journal Title: New Journal of Physics Vol.11
  • Peer Reviewed
• [Journal Article] Unconditional security of the Bennett 1992 quantum-key-distribution scheme with a strong reference pulse (2009)
  • Author(s): K.Tamaki, N.Lutkenhaus, M.Koashi, J.Batuwantudawe
  • Journal Title: Physical Review A Vol.80
  • Peer Reviewed
• [Journal Article] Simple security proof of quantum key distribution based on complementarity (2009)
  • Author(s): M.Koashi
  • Journal Title: New Journal of Physics Vol.11
  • Peer Reviewed
• [Journal Article] Local transformation of two Einstein-Podolsky-Rosen photon pairs into a three-photon W state (2009)
  • Author(s): T.Tashima, T.Wakatsuki, S.K.Ozdemir, T.Yamamoto, M.Koashi, N.Imoto
  • Journal Title: Physical Review Letters Vol.102
  • Peer Reviewed
• [Journal Article] Compact Toffoli gate using weighted graph states (2009)
  • Author(s): M.S.Tame, S.K.Ozdemir, M.Koashi, N.Imoto, M.S.Kim
  • Journal Title: Physical Review A Vol.79
  • Peer Reviewed
• [Journal Article] Local expansion of photonic W state using a polarization dependent beamsplitter (2009)
  • Author(s): T.Tashima, S.K.Ozdemir, T.Yamamoto, M.Koashi, N.Imoto
  • Journal Title: New Journal of Physics Vol.11
  • Peer Reviewed
• [Journal Article] Local Transformation of Two Einstein-Podolsky-Rosen Photon Pairs into a Three-Photon W State (2009)
  • Author(s): Toshiyuki Tashima, et al.
  • Journal Title: Physical Review Letters 102
  • Peer Reviewed
• [Journal Article] Simple security proof of quantum key distribution based on complementarity (2009)
  • Author(s): Masato Koashi
  • Journal Title: New Journal of Physics 11
  • Peer Reviewed
• [Journal Article] Unconditional security of the Bennett 1992 quantum-key-distribution scheme with a strong reference pulse (2009)
  • Author(s): Kiyoshi Tamaki, et al.
  • Journal Title: Physical Review A 80
  • Peer Reviewed
• [Journal Article] Optimal entanglement generation for efficient hybrid quantum repeaters (2009)
  • Author(s): Koji Azuma, et al.
  • Journal Title: Physical Review A 80
  • Peer Reviewed
• [Journal Article] Boosting up quantum key distribution by learning statistics of practical single-photon sources (2009)
  • Author(s): Yoritoshi Adachi, et al.
  • Journal Title: New Journal of Physics 11
  • Peer Reviewed
• [Journal Article] Local expansion of photonic W state using apolarization dependent beamsplitter (2009)
  • Author(s): T. Tashima, et al.
  • Journal Title: New Journal of Physics 11
  • Peer Reviewed
• [Journal Article] Compact Toffoli gate using weighted graph states (2009)
  • Author(s): M. Tame, et al.
  • Journal Title: Physical Review A 79
  • Peer Reviewed
• [Journal Article] Robust photonic entanglement distribution by state-independent encoding onto decoherence-free subspace (2008)
  • Author(s): T.Yamamoto, K.Hayashi, S.K.Ozdemir, M.Koashi, N.Imoto
  • Journal Title: Nature Photonics Vol.2 Pages: 488-491
  • Peer Reviewed
• [Journal Article] Robust photonic entanglement distribution by state-independent encoding onto decoherence-free subspace (2008)
  • Author(s): T. Yamamoto, et al.
  • Journal Title: Nature Photonics 2 Pages: 488-491
  • Peer Reviewed
• [Presentation] Complementarity approach to security of quantum key distribution with practical devices (2010)
  • Author(s): Masato Koashi
  • Organizer: Updating Quantum Cryptography and Communications (UQCC2010)(招待講演)
  • Place of Presentation: ANA InterContinental Hotel, Tokyo, Japan.
  • Year and Date: 2010-10-19
• [Presentation] Complementarity approach to security of quantum key distribution with practical devices (2010)
  • Author(s): Masato Koashi
  • Organizer: Updating Quantum Cryptography and Communications (UQCC2010)
  • Place of Presentation: ANA Inter Continental Hotel, Tokyo, Japan(招待講演)
  • Year and Date: 2010-10-19
• [Presentation] Boosting up quantum key distribution by learning multi-photon statistics of practical single-photon sources (2010)
  • Author(s): Yoritoshi Adachi, Masato Koashi, et al.
  • Organizer: Updating Quantum Cryptography and Communications (UQCC2010)
  • Place of Presentation: ANA Inter Continental Hotel, Tokyo, Japan
  • Year and Date: 2010-10-19
• [Presentation] Unconditional security of QKD based on three bases with threshold detectors (2010)
  • Author(s): Yuya Kobayashi, Masato Koashi, et al.
  • Organizer: The Tenth International Conference on Quantum Communication, Measurement and Computation (QCMC 2010)
  • Place of Presentation: Univ.of Queensland, Brisbane, Queensland, Australia
  • Year and Date: 2010-07-22
• [Presentation] Boosting up quantum key distribution with knowledge of higher-order emission statistics of practical single-photon sources (2010)
  • Author(s): Yoritoshi Adachi, Masato Koashi, et al.
  • Organizer: The Tenth International Conference on Quantum Communication, Measurement and Computation (QCMC 2010)
  • Place of Presentation: Univ.of Queensland, Brisbane, Queensland, Australia
  • Year and Date: 2010-07-22
• [Presentation] Security of quantum key distribution with practical detectors (2010)
  • Author(s): Yuya Kobayashi, Masato Koashi, et al.
  • Organizer: International Conference on Core Research and Engineering Science of Advanced Materials (Global COE Program), Third International Conference on Nanospintronics Design and Realization (3rd-ICNDR)
  • Place of Presentation: Convention Center, Osaka University, Osaka, Japan
  • Year and Date: 2010-06-01
• [Presentation] Security of quantum key distribution with practical devices, International Conference on Core Research and Engineering Science of Advanced Materials (Global COE Program) (2010)
  • Author(s): Masato Koashi
  • Organizer: Third International Conference on Nanospintronics Design and Realization (3rd-ICNDR) (招待講演)
  • Place of Presentation: Convention Center, Osaka University, Osaka, Japan.
  • Year and Date: 2010-05-30
• [Presentation] Security of quantum key distribution with practical devices (2010)
  • Author(s): Masato Koashi
  • Organizer: International Conference on Core Research and Engineering Science of Advanced Materials (Global COE Program), Third International Conference on Nanospintronics Design and Realization (3rd-ICNDR)
  • Place of Presentation: Convention Center, Osaka University, Osaka, Japan(招待講演)
  • Year and Date: 2010-05-30
• [Presentation] Understanding security of quantum key distribution via complementarity (2010)
  • Author(s): Masato Koashi
  • Organizer: 2010 International Symposium on Physics of Quantum Technology (2010 ISPQT) (招待講演)
  • Place of Presentation: Hitotsubashi memorial hall, Tokyo, Japan.
  • Year and Date: 2010-04-09
• [Presentation] Understanding security of quantum key distribution via complementarity (2010)
  • Author(s): Masato Koashi
  • Organizer: 2010 International Symposium on Physics of Quantum Technology(2010 ISPQT)
  • Place of Presentation: Hitotsubashi memorialhall, Tokyo, Japan(招待講演)
  • Year and Date: 2010-04-09
• [Presentation] Security of quantum key distribution with threshold detectors based on three bases (2010)
  • Author(s): Yuya Kobayashi, Masato Koashi, et al.
  • Organizer: 2010 International Symposium on Physics of Quantum Technology(2010 ISPQT)
  • Place of Presentation: Hitotsubashi memorialhall, Tokyo, Japan
  • Year and Date: 2010-04-08
• [Presentation] 量子暗号のセキュリティ理論 (2010)
  • Author(s): 小芦雅斗
  • Organizer: 応用物理学会・量子エレクトロニクス研究会「量子情報の最前線と今後10年の展開」
  • Place of Presentation: 上智大学軽井沢セミナーハウス
  • Year and Date: 2010-01-09
• [Presentation] Security of key distribution and complementarity in quantum mechanics (2009)
  • Author(s): Masato Koashi
  • Organizer: The 4th International Conference on Information Theoretic Security (ICITS2009) (招待講演)
  • Place of Presentation: Granship, Shizuoka, Japan.
  • Year and Date: 2009-12-04
• [Presentation] Security of Key Distribution and Complementarity in Quantum Mechanics (2009)
  • Author(s): 小芦雅斗
  • Organizer: The 4th International Conference on Information Theoretic Security (ICITS2009)
  • Place of Presentation: Granship, 静岡
  • Year and Date: 2009-12-04
• [Presentation] 量子暗号理論から見た量子系の諸性質の定量的な理解 (2009)
  • Author(s): 小芦雅斗
  • Organizer: 九州大学応用力学研究所平成21年度共同利用研究集会「非線形波動研究の現状と将来一次の10年への展望」
  • Place of Presentation: 九州大学
  • Year and Date: 2009-11-21
• [Presentation] Security of QKD based on three bases with threshold detectors (2009)
  • Author(s): 小林祐也, 他
  • Organizer: 第20回量子情報技術研究会 (QIT21)
  • Place of Presentation: 電気通信大学
  • Year and Date: 2009-11-05
• [Presentation] Boosting up quantum key distribution by learning statistics of practical single-photon sources (2009)
  • Author(s): 足立頼俊, 他
  • Organizer: 第20回量子情報技術研究会 (QIT21)
  • Place of Presentation: 電気通信大学
  • Year and Date: 2009-11-05
• [Presentation] Local transformation of two EPR photon pairs into a three-photon W state using a polarization dependent beamsplitter (2009)
  • Author(s): 田嶌俊之, et al.
  • Organizer: International Conference on Quantum Communication and Quantum Networking
  • Place of Presentation: Grand Hotel Moon Valley, Naples, Italy
  • Year and Date: 2009-10-27
• [Presentation] 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 (2009)
  • Author(s): 足立頼俊, 他
  • Organizer: 日本物理学会2009年秋季大会
  • Place of Presentation: 熊本大学
  • Year and Date: 2009-09-27
• [Presentation] Security of practical quantum key distribution based on three bases (2009)
  • Author(s): 小林祐也, 他
  • Organizer: 日本物理学会2009年秋季大会
  • Place of Presentation: 熊本大学
  • Year and Date: 2009-09-25
• [Presentation] DFS-based entanglement distribution through an optical fiber (2009)
  • Author(s): Takashi Yamamoto, et al.
  • Organizer: QIPC 2009 International Conference on Quantum Information Processing and Communication
  • Place of Presentation: University Sapienza of Rome, Italy
  • Year and Date: 2009-09-21
• [Presentation] Passive-decoy-state quantum cryptography with partly characterized sources (2009)
  • Author(s): 足立頼俊, et al.
  • Organizer: QIPC 2009 International Conference on Quantum Information Processing and Communication
  • Place of Presentation: University Sapienza of Rome, Italy
  • Year and Date: 2009-09-21
• [Presentation] Complementarity and security of quantum key distribution (2009)
  • Author(s): Masato Koashi
  • Organizer: The 3rd Conference on Quantum Information and Quantum Control (CQIQCIII) (招待講演)
  • Place of Presentation: Fields Institute, Toronto, Canada.
  • Year and Date: 2009-08-27
• [Presentation] Complementarity and security of quantum key distribution (2009)
  • Author(s): 小芦雅斗
  • Organizer: The 3rd Conference on Quantum Information and Quantum Control (CQIQCIII)
  • Place of Presentation: Fields Institute, Toronto, Canada
  • Year and Date: 2009-08-27
• [Presentation] Preparation of a three-photon W state from two EPR photon pairs by LOCC (2009)
  • Author(s): 田嶌俊之, et al.
  • Organizer: CLEO/Europe-EQEC Conference 2009
  • Place of Presentation: International Congress Centre, Munich, Germany
  • Year and Date: 2009-06-18
• [Presentation] 単一光子源の光子統計の習得がもたらす量子鍵配送の効率化 (2009)
  • Author(s): 足立頼俊, 他
  • Organizer: 第6回 原子・分子・光化学 (AMO) 討論会
  • Place of Presentation: 大阪大学
  • Year and Date: 2009-06-12
• [Presentation] Local transformation of two EPR photon pairs into a three-photon W state (2009)
  • Author(s): 田嶌俊之, 他
  • Organizer: 第20回量子情報技術研究会 (QIT20)
  • Place of Presentation: 広島大学
  • Year and Date: 2009-05-22
• [Presentation] Quantitative relations among different aspects of quantum correlations (2009)
  • Author(s): Masato Koashi
  • Organizer: The 4th Workshop on Theory of Quantum Computation, Communication, and Cryptography (TQC 2009) (招待講演)
  • Place of Presentation: University of Waterloo, Canada.
  • Year and Date: 2009-05-13
• [Presentation] Quantitative relations among different aspects of quantum correlations (2009)
  • Author(s): 小芦雅斗
  • Organizer: The 4th Workshop on Theory of Quantum Computation, Communication, and Cryptography (TQC 2009)
  • Place of Presentation: University of Waterloo, Canada
  • Year and Date: 2009-05-13
• [Presentation] 相補性及びエンタングルメントと量子暗号 (2009)
  • Author(s): 小芦雅斗
  • Organizer: 日本物理学会第64回年次大会29pTB-5(シンポジウム講演)
  • Place of Presentation: 立教大学
  • Year and Date: 2009-03-29
• [Presentation] Quantum nonlocality without entanglement in a pair of qubits (2009)
  • Author(s): Masato Koashi
  • Organizer: DEX-SMI Workshop on Quantum Statistical Inference(招待講演)
  • Place of Presentation: National Institute of Informatics (NII), Tokyo, Japan.
  • Year and Date: 2009-03-02
• [Presentation] Entanglement, monogamy, and complementarity (2009)
  • Author(s): Masato Koashi
  • Organizer: UK-Japan Quantum Information Workshop(招待講演)
  • Place of Presentation: British Embassy Tokyo, Japan.
  • Year and Date: 2009-01-22
• [Presentation] Entanglement, monogamy, and complementarity (2009)
  • Author(s): M. Koashi
  • Organizer: UK-Japan Quantum Information Workshop
  • Place of Presentation: British Embassy Tokyo
• [Presentation] Quantum nonlocality without entanglement in a pair ofqubits (2009)
  • Author(s): M. Koashi, et al.
  • Organizer: DEX-SMI Workshop on Quantumstatistical Inference
  • Place of Presentation: National Institute of Informatics (NII), Tokyo
• [Presentation] On the irreversiblity of measurements of correlations (2008)
  • Author(s): Masato Koashi
  • Organizer: International Workshop on Statistical-Mechanical Informatics 2008(招待講演)
  • Place of Presentation: Sendai International Center, Japan.
  • Year and Date: 2008-09-14
• [Presentation] 量子暗号に現れる量子力学の諸性質 (2008)
  • Author(s): 小芦雅斗
  • Organizer: 科学基礎論学会2008年度講演会シンポジウム(招待講演)
  • Place of Presentation: 東京電機大学
  • Year and Date: 2008-06-21
• [Presentation] 量子暗号に現れる量子力学の諸性質 (2008)
  • Author(s): 小芦雅斗
  • Organizer: 科学基礎論学会2008年度講演会シンポジウム
  • Place of Presentation: 東京電機大学
  • Year and Date: 2008-06-21
• [Presentation] Security of entanglement-based quantum key distributionwith practical detectors (2008)
  • Author(s): M. Koashi, et al.
  • Organizer: The Ninth International Conference onQuantum Communication. Measurement andComputing (QCMC 2008)
  • Place of Presentation: University of Calgary, Canada
• [Presentation] On the irreversiblity of measurements of correlations (2008)
  • Author(s): M. Koashi
  • Organizer: International Workshop on statistical-Mechanical Informatics 2008
  • Place of Presentation: Sendai International Center, Japan
• [Presentation] Security of entanglement-based QKD with practicaldetectors (2008)
  • Author(s): 小芦雅斗,, 他
  • Organizer: 第18回量子情報技術研究会(QIT18)
  • Place of Presentation: 東京大学小柴ホール
• [Presentation] エンタングルした光パルス対による量子鍵配送プロトコルの安全性 (2008)
  • Author(s): 小芦雅斗,, 他
  • Organizer: 日本物理学会2008年秋季大会
  • Place of Presentation: 岩手大学上田キャンパス
• [Book] SGCライブラリ67:量子暗号理論の展開 (2008)
  • Author(s): 小芦雅斗、小柴健史
  • Publisher: サイエンス社
• [Book] 量子暗号理論の展開 (2008)
  • Author(s): 小芦雅斗(共著)
  • Publisher: サイエンス社