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2008 Fiscal Year Annual Research Report

量子情報と量子計算の数理解析的基礎研究

Research Project

Project/Area Number 17340021
Research InstitutionNagoya University

Principal Investigator

小澤 正直  Nagoya University, 大学院・情報科学研究科, 教授 (40126313)

Keywords数理物理学 / 数学基礎論 / 量子情報 / 量子計算 / 量子測定 / 不確定性原理 / 量子集合論 / 量子確率論
Research Abstract

1.唐澤、バナクローチェ、小澤は、任意のユニタリゲートの任意の保存法則のもとでの実装に関するゲート忠実度の一般的上限を得て、それがブロッホ球における保存量とユニタリゲートの幾何学的関係と制御系のサイズに依存することを示した。
2.量子チューリング機械と一様量子回路族の計算量的同等性は、量子計算量理論の基本問題であるが、これまでBQPクラス以外のEQPやZQPクラスに対しては未解決であった。西村と小澤は、有限生成一様量子回路族という新しい回路族のクラスを定めて、量子チューリング機械と有限生成一様量子回路族が完全に計算量的に同等であり、BQP, EQP, ZQP等、全ての対応する計算量クラスに対して計算量的同等性が成立することを示した。
3.日合グループは、自由確率、量子情報理論について研究し、以下の成果を得た。(1)射影作用素に対して自由エントロピーを導入し、2つの射影作用素の自由エントロピーと相互自由フィッシャー情報量の間の対数ソボレフ型不等式を示した。(2)量子共分散と量子フィッシャー情報量との関係を考察し,不確定性原理と関連して知られていた不等式を一般化した。(3)サイト間に相関があるKMS状態と有限相関状態に対する量子仮説検定について,各種の漸近エラー限界に関する統一的な研究を行った。
4.尾畑グループは、ボゾンフォック空間上の非有界作用素の生成・消滅作用素に関する微分を導入し、それらの双対として従来の量子確率積分を拡張し、量子マルチンゲール表現定理や作用素の量子確率積分表示を得た。
5.田中グループは、ランダム性に関する計算量的研究を行い、無限列およびランダム実数の計算量変動、及び、部分ランダム性の諸定義の擬同値性に関する成果を得た。
6.堀田は、LOCCと基底状態の量子もつれを用いてエネルギーを転送できる量子プロトコル、量子エネルギーテレポーテーションを提案した。

  • Research Products

    (31 results)

All 2009 2008

All Journal Article (21 results) (of which Peer Reviewed: 21 results) Presentation (10 results)

  • [Journal Article] Perfect computational equivalence between quantum Turing machines and finitely generated uniform quantum circuit families2009

    • Author(s)
      H. Nishimura, M. Ozawa
    • Journal Title

      Quantum Information Processing 8

      Pages: 12-24

    • Peer Reviewed
  • [Journal Article] Gete fidelity of arbitrary single-qubit gates constrained by conservation laws2009

    • Author(s)
      T. Karasawa, J. Gea-Banacloche, M. Ozawa
    • Journal Title

      Journal of Physics A : Mathematical and Theoretical (掲載決定)

    • Peer Reviewed
  • [Journal Article] A log-Sobolev type inequality for free entropy of two projections2009

    • Author(s)
      F. Hiai, Y. Ueda
    • Journal Title

      Ann. Inst. H. Poincare Probab. Statist. 45

      Pages: 239-249

    • Peer Reviewed
  • [Journal Article] Quantum covariance, quantum Fisher information and the uncertainty principle2009

    • Author(s)
      P. Gibilisco, F. Hiai, D. Petz
    • Journal Title

      IEEE Trans. Inform. Theory 55

      Pages: 439-443

    • Peer Reviewed
  • [Journal Article] Riemannian metrics on positive definite matrices related to means2009

    • Author(s)
      F. Hiai, D. Petz
    • Journal Title

      Linear Algebra Appl. 430

      Pages: 3105-3130

    • Peer Reviewed
  • [Journal Article] Monotonicity for entrywise functions of matrices2009

    • Author(s)
      F. Hiai
    • Journal Title

      Linear Algebra Appl. 45(掲載決定)

    • Peer Reviewed
  • [Journal Article] Annihilation-derivative, creation-derivative and representation of quantum martingales2009

    • Author(s)
      U. C. Ji, N. Obata
    • Journal Title

      Commun. Math. Phys. 286

      Pages: 751-775

    • Peer Reviewed
  • [Journal Article] Quantum stochastic integral representations of Fock space operators2009

    • Author(s)
      U. C. Ji, N. Obata
    • Journal Title

      Stochastics (掲載決定)

    • Peer Reviewed
  • [Journal Article] Quantum energy teleportation in spin chain systems2009

    • Author(s)
      M. Hotta
    • Journal Title

      Journal of the Physical Society of Japan 78

      Pages: 034001(1-8)

    • Peer Reviewed
  • [Journal Article] Quantum measurement information as a key to energy extraction from local vacuums2008

    • Author(s)
      M. Hotta
    • Journal Title

      Physical Review D 78

      Pages: 045006(1-9)

    • Peer Reviewed
  • [Journal Article] Quantum precision limits for any implementation of single qubit gates under conservation laws2008

    • Author(s)
      T. Karasawa, M. Ozawa, J. Gea-Banacloche, K. Nemoto
    • Journal Title

      International Journal of Quantum Information 6

      Pages: 701-706

    • Peer Reviewed
  • [Journal Article] Quantum limits of measurements induced by multiplicative conservation laws : Extension of the Wigner-Araki-Yanase Theorem2008

    • Author(s)
      G. Kimura, B. K. Meister, M. Ozawa
    • Journal Title

      Physical Review A 78

      Pages: 032106(1-7)

    • Peer Reviewed
  • [Journal Article] Notes on microstate free entropy of projections2008

    • Author(s)
      F. Hiai, Y. Ueda
    • Journal Title

      Publ. Res. Inst. Math. Sci., Kyoto Univ. 44

      Pages: 49-89

    • Peer Reviewed
  • [Journal Article] Free energy density for mean field perturbation of states of a one-dimensional spin chain2008

    • Author(s)
      F. Hiai, M. Mosonyi, H. Ohno, D. Petz
    • Journal Title

      Reviews in Mathematical Physics 20

      Pages: 335-365

    • Peer Reviewed
  • [Journal Article] Error exponents in hypothesis testing for correlated states on a spin chain2008

    • Author(s)
      F. Hiai, M. Mosonyi, T. Ogawa
    • Journal Title

      Journal of Mathematical Physics 49

      Pages: 007803(1-22)

    • Peer Reviewed
  • [Journal Article] Asymptotic distinguishability measures for shift-invariant quasi-free states of fermionic lattice systems2008

    • Author(s)
      M. Mosonyi, F. Hiai, T. Ogawa, M. Fannes
    • Journal Title

      Journal of Mathematical Physics 49

      Pages: 072104(1-11)

    • Peer Reviewed
  • [Journal Article] Generalization of complexity oscillations in infinite sequeces2008

    • Author(s)
      C. G. Liu, K. Tanaka, T. Yamazaki
    • Journal Title

      4rd International Conference on Natural Computation (ICNC'08), IEEE

      Pages: 299-303

    • Peer Reviewed
  • [Journal Article] The quasi-equivalence between the definitions of partial randomness2008

    • Author(s)
      C. G. Liu, K. Tanaka, T. Yamazaki
    • Journal Title

      4rd International Conference on Natural Computation (ICNC'08), IEEE

      Pages: 371-375

    • Peer Reviewed
  • [Journal Article] Complexity Oscillations in Random Reals2008

    • Author(s)
      C. G. Liu, K. Tanaka
    • Journal Title

      IEICE Transactions on Information and Systems 91

      Pages: 2517-2518

    • Peer Reviewed
  • [Journal Article] A protocol for quantum energy distribution2008

    • Author(s)
      M. Hotta
    • Journal Title

      Physics Letters A 372

      Pages: 5671-5676

    • Peer Reviewed
  • [Journal Article] Channel estimation theory of low-noise multiple parameters : Attainability problem of the Cramer-Rao bounds2008

    • Author(s)
      M. Hotta, T. Karasawa
    • Journal Title

      Physical Review A 78

      Pages: 012332(1-10)

    • Peer Reviewed
  • [Presentation] Quantum measurement theory : mathematical and conceptual foundations2009

    • Author(s)
      M. Ozawa
    • Organizer
      UK-Japan Quantum Information Workshop, British Embassy
    • Place of Presentation
      Tokyo, Japan
    • Year and Date
      2009-01-23
  • [Presentation] Recent developments in quantum white noise theory : Stochastic integrals and transformations2008

    • Author(s)
      N. Obata
    • Organizer
      29th Conference on Quantum Probability and Related Topics
    • Place of Presentation
      Hammamet, Tunisia
    • Year and Date
      20081013-20081018
  • [Presentation] Mutual information and mutual pressure2008

    • Author(s)
      F. Hiai
    • Organizer
      Conference "Information and Communication, " Alfred Renyi Institute of Mathematics
    • Place of Presentation
      Budapest, Hungary
    • Year and Date
      20080825-20080828
  • [Presentation] Pressure and its Legendre transform in microstate free entropy2008

    • Author(s)
      F. Hiai
    • Organizer
      11th Workshop "Non-commutative Harmonic Analysis with Applications to Probability"
    • Place of Presentation
      Bedlewo, Poland
    • Year and Date
      20080817-20080823
  • [Presentation] Universal uncertainty principle and conservation-law-induced quantum limits on quantum logic operations2008

    • Author(s)
      M. Ozawa
    • Organizer
      2008 International Symposium on Physics of Quantum Technology (ISPQT 2008)
    • Place of Presentation
      Nara, Japan
    • Year and Date
      2008-11-27
  • [Presentation] Conservation Laws Limit Quantum Control Accuracy2008

    • Author(s)
      M. Ozawa
    • Organizer
      Qurope Workshop Quantum/Classical Control in Quantum Information : Theory and Experiments (QCCQI2008)
    • Place of Presentation
      Otranto, Italy
    • Year and Date
      2008-09-14
  • [Presentation] Protocol of Quantum Authentication with Secure Quantum Pass words2008

    • Author(s)
      M. Hotta, M. Ozawa
    • Organizer
      9th Int. Conf. Quantum Communication, Measurement and Computing (QCMC2008)
    • Place of Presentation
      Calgary, Canada
    • Year and Date
      2008-08-23
  • [Presentation] Theoretical constraints on implementations of arbitrary single qubit gates under conservation laws2008

    • Author(s)
      T. Karasawa, M. Ozawa, K. Nemoto
    • Organizer
      9th Int. Conf. Quantum Communication, Measurement and Computing (QCMC2008)
    • Place of Presentation
      Calgary, Canada
    • Year and Date
      2008-08-23
  • [Presentation] Quantum Energy Teleportation2008

    • Author(s)
      M. Hotta
    • Organizer
      9th Int. Conf. Quantum Communication, Measurement and Computing (QCMC2008)
    • Place of Presentation
      Calgary, Canada
    • Year and Date
      2008-08-23
  • [Presentation] Uncertainty Principle, Conservation Laws, and the Size of Quantum Controllers2008

    • Author(s)
      M. Ozawa
    • Organizer
      Workshop : Osamu Hirota, A True Quantum Communications, Perimeter Institute
    • Place of Presentation
      Waterloo, Canada
    • Year and Date
      2008-06-26

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Published: 2010-06-11   Modified: 2016-04-21  

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