半導体発光素子による光子数量子状態発生と量子光学

2010 Fiscal Year Annual Research Report

• Project Area: Optical science of dynamically correlated electrons in semiconductors
• Project/Area Number: 20104003
• Research Institution: Osaka University
• Principal Investigator: 井元 信之 大阪大学, 大学院・基礎工学研究科, 教授 (00313479)
• Keywords: 量子情報処理 / 単一光子 / エンタングルメント / 非線形光学効果 / 動的多体量子効果 / 微小共振器 / 光子統計 / 量子トモグラフィ

Research Abstract

量子力学の原理に基づいた情報科学の探求により、物理系の量子性の理解が大いに深まり、量子コンピューティングや量子暗号などの新しい情報処理の可能性が示され、計測や量子論そのものの研究とあいまって、広く量子情報処理の分野として急速に研究が進んでいる。現在の情報技術における光の役割と同様に、量子情報技術において光に期待される役割は大きく、光の非古典的状態発生及び非局所性を示すエンタングルメント光発生はもとより、その究極的な制御と測定技術の開拓が求められている。特に量子情報通信において量子状態を離れた地点に送ることは基本的な技術である。それと同時に、現実的な光源や制御技術は必然的に不完全であり、それらを用いた場合の量子情報通信を考えることは非常に重要である。
昨年度(平成21年度)には半導体量子ドットやダイヤモンドのカラーセンター等により発生される不完全な単一光子に有用な長距離量子暗号方式を提案することが出来きたが、今期(平成22年度)はこの普及のために学会発表を行った。また、より長距離の通信を実現するためには量子メモリや量子非破壊測定等を駆使した量子リピーターの実現が重要となる。昨年度に提案を行ったコヒーレント光と共振器結合原子系あるいは半導体量子ドット系との相互作用を用いた量子リピーターの研究をさらに進めた方法を検討し、現在論文執筆中である。また、共振器結合系への実験的アプローチとしてマイクロトロイド共振器を利用した光の遅延を観測することに成功した。これも論文準備中である。

Research Products

• [Journal Article] Efficient Decoherence-Free Entanglement Distribution over Lossy Quantum Channels (2011)
  • Author(s): Rikizo Ikuta, Nobuyuki Imoto, et al
  • Journal Title: Phys.Rev Lett. Volume: 106 Pages: 110503
  • Peer Reviewed
• [Journal Article] Optimal local expansion of W states using linear optics and Fock states (2011)
  • Author(s): Rikizo Ikuta, Nobuyuki ImJoto, et al
  • Journal Title: Phys.Rev Volume: A83 Pages: 012314
  • Peer Reviewed
• [Journal Article] Demonstration of Local Expansion Toward Large-Scale Entangled Webs (2010)
  • Author(s): Toshiyuki Tashima, Nobuyuki Imoto, et al
  • Journal Title: Phys.Rev.Lett. Volume: 105 Pages: 210503
  • Peer Reviewed
• [Presentation] DFSによるエンタングルメント配送の高効率化 (2010)
  • Author(s): 小野陽平 井元信之, 他
  • Organizer: 第19回量子情報技術研究会(QIT23)
  • Place of Presentation: 東京大学小柴ホール
  • Year and Date: 2010-11-15
• [Presentation] Boosting up quantum key distribution by learning multi-photon statistics of practical single-photon sources (2010)
  • Author(s): Yoritoshi Adachi, Nobuyuki Imoto, et al.
  • Organizer: Updating Quantum Cryptography and Communications(UQCC2010)
  • Place of Presentation: ANA InterContinental Hotel, Tokyo, Japan
  • Year and Date: 2010-10-19
• [Presentation] Experimental demonstration of local expansion for Wstates (2010)
  • Author(s): Toshiyuki Tashima, Nobuyuki Imoto, et al.
  • Organizer: International Conference on Quantum Information and Computation
  • Place of Presentation: Wenner-Gren Center, Stockholm, Sweden
  • Year and Date: 2010-10-05
• [Presentation] DFSを用いたエンタングルメント配送の高効率化 (2010)
  • Author(s): 生田力三, 井元信之, 他
  • Organizer: 日本物理学会2010年秋季大会
  • Place of Presentation: 大阪府立大学
  • Year and Date: 2010-09-25
• [Presentation] もつれあい光子と量子暗号 (2010)
  • Author(s): 井元信之
  • Organizer: 第6回光エレクトロニクスフォーラム
  • Place of Presentation: 大阪大学先端科学イノベーションセンター(Invited)
  • Year and Date: 2010-09-10
• [Presentation] 光子を用いた量子情報処理 (2010)
  • Author(s): 井元信之
  • Organizer: 最先端研究開発支援プログラム「量子情報処理プロジェクト」夏期研修会
  • Place of Presentation: ホテルサンライズ知念(Invited)
  • Year and Date: 2010-08-20
• [Presentation] Quantum repeaterから見た固体量子メモリーへの期待 (2010)
  • Author(s): 井元信之
  • Organizer: 2010年度DYCE理論ワークショップ
  • Place of Presentation: 阪大理学部H棟(Invited)
  • Year and Date: 2010-08-09
• [Presentation] Experimental demonstration of local expansion for photonic W states (2010)
  • Author(s): Toshiyuki Tashima, Nobuyuki Imoto, et al.
  • Organizer: The Tenth International Conference on Quantum Communication, Measurement and Computation (QCMC 2010)
  • Place of Presentation: Univ.of Queenaland, Brisbane, Queensland, Australia
  • Year and Date: 2010-07-22
• [Presentation] Efficient and robust photonic entanglement distribution using decoherence-free subspace (2010)
  • Author(s): Rikizo Ikuta, Nobuyuki Imoto, 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] Unconditional security of QKD based on three bases with threshold detectors (2010)
  • Author(s): Yuya Kobayashi, Nobuyuki Imoto, 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, Nobuyuki Imoto, 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] Managing Multipartite Entanglement Using Photons (2010)
  • Author(s): N.Imoto
  • Organizer: The 4th International Symposium on Information Electronics Systems/CERIES-GCOE10
  • Place of Presentation: Sendai Excel Hotel Tokyu Sendai, Japan(Invited)
  • Year and Date: 2010-07-08
• [Presentation] Quantum Nature of Photons and Optical Information (2010)
  • Author(s): N.Imoto
  • Organizer: The 4th Yamada Symposium on Advanced Photons and Science Evolution, 2010 APSE 2010)
  • Place of Presentation: JICA Osaka(Invited)
  • Year and Date: 2010-06-14
• [Presentation] Entanglement-based Photonic Information Processing (2010)
  • Author(s): N.Imoto
  • 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: Osaka University Convention Center(Invited)
  • Year and Date: 2010-06-04
• [Presentation] Protection of photonic quantum states via decoherence-free subspaces (2010)
  • Author(s): Takashi Yamamoto
  • 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: 2010-06-04
• [Presentation] Efficient and robust photonic entanglement distribution using decoherence-free subspace (2010)
  • Author(s): Rikizo Ikuta, Nobuyuki Imoto, et al.
  • Organizer: International Conference on Core Research and Engineering Science of Advanced Materials (Global COE Program), Third International Conference on Nanospintronies 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 detectors (2010)
  • Author(s): Yuya Kobayashi, Nobuyuki Imoto, 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 (2010)
  • Author(s): Masato Koashi, Nobuyuki Imoto
  • 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(Invited)
  • Year and Date: 2010-05-30
• [Presentation] Local expansion of photonic W states using linear optics (2010)
  • Author(s): Toshiyuki Tashima, Nobuyuki Imoto, 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: 2010-05-30
• [Presentation] Managing multipartite entanglement (2010)
  • Author(s): N.Imoto
  • Organizer: 5th Workshop on "Advances in Foundation of Quantum Mechanics and Quantum Information with atoms and photons"
  • Place of Presentation: INRIM, Turin, Italy(Invited)
  • Year and Date: 2010-05-25
• [Presentation] 局所操作による光子系W状態拡張実験 (2010)
  • Author(s): 田嶌俊之, 井元信之, 他
  • Organizer: 第22回量子情報技術研究会(QIT22)
  • Place of Presentation: 大阪大学医学部 銀杏会館
  • Year and Date: 2010-05-10
• [Presentation] Understanding security of quantum key distribution via complementarity (2010)
  • Author(s): Masato Koashi, Nobuyuki Imoto
  • Organizer: 2010 International Symposium on Physics of Quantum Technology (2010 ISPQT)
  • Place of Presentation: Hitotsubasbi memorial hall, Tokyo, Japan(Invited)
  • Year and Date: 2010-04-09
• [Presentation] Complete process tomography of photonic one-way quantum computing (2010)
  • Author(s): Yuuki Tokunaga, Nobuyuki Imoto, et al.
  • Organizer: 2010 International Symposium on Physics of Quantum Technology (2010 ISPQT)
  • Place of Presentation: Hitotsubashi memorial hall, Tokyo, Japan
  • Year and Date: 2010-04-08
• [Presentation] Local expansion of photonic W states using linear optics (2010)
  • Author(s): Tsuyoshi Kitano, Nobuyuki Imoto, et al.
  • Organizer: 2010 International Symposium on Physics of Quantum Technology (2010 ISPQT)
  • Place of Presentation: Hitotsubashi memorial hall, Tokyo, Japan
  • Year and Date: 2010-04-08
• [Presentation] Security of quantum key distribution with threshold detectors based on three bases (2010)
  • Author(s): Yuya Kobayashi, Nobuyuki Imoto, et al.
  • Organizer: 2010 International Symposium on Physics of Quantum Technology (2010 ISPQT)
  • Place of Presentation: Hitotsubashi memorial hall, Tokyo, Japan
  • Year and Date: 2010-04-08