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2006 Fiscal Year Final Research Report Summary

Black Hole and Quantum Information

Research Project

Project/Area Number 15540258
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Particle/Nuclear/Cosmic ray/Astro physics
Research InstitutionTokyo Institute of Technology

Principal Investigator

HOSOYA Akio  Tokyo Institute of Technology, Department of Physics, Professor (80028258)

Co-Investigator(Kenkyū-buntansha) KOIKE Tatsuhiko  Keio University, Department of Physics, Assistant professor (40286646)
Project Period (FY) 2003 – 2006
Keywordsquantum comnutation / variational princinle / unitary transformation / mixed state / quantum brachistochrone equation / measurement
Research Abstract

We have given a general frame work to find an optimal quantum evolution for given initial final states in quantum mechanics in analogy to brachistochrone in classical mechanics. The formulation is based on variational principle, in which the Hamiltonian is regarded as a dynamical variable as well as the quantum state. The available Hamiltonian is constrained by natural law or experimental set-up etc and taken care of as the constraints. A few simple examples are demonstrated.
This method is extended to the case of arbitrary initial state so as to be relevant to quantum computation. We demonstrated it in typical two qubit gates. To scale-up to many qubits, we have developed a powerful numerical methods. The method is extended to mixed state cases by using measurement. In some cases, the quantum trajectory which passes mixed state is more efficient.
We hope our method is useful for quantum computation algorithm, quantum control and Making efficient quantum devices.

  • Research Products

    (6 results)

All 2007 2006

All Journal Article (4 results) (of which Peer Reviewed: 2 results) Presentation (2 results)

  • [Journal Article] Time Optimal Unitary Operations2007

    • Author(s)
      Alberto Carlini, Akio Hosoya, Tatsuhiko Koike, Yosuke Okudaira
    • Journal Title

      Phys.Rev.A 75

      Pages: 042308

    • Description
      「研究成果報告書概要(和文)」より
    • Peer Reviewed
  • [Journal Article] Yosuke Okudaira Time Optimal Unitary Operations2007

    • Author(s)
      Alberto Carlini, Akio Hosoya, Tatsuhiko Koike
    • Journal Title

      Phys.Rev.A 75

      Pages: 060503

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Time Optimal Quantum Evolution2006

    • Author(s)
      Alberto Carlini, Akio Hosoya, Tatsuhiko Koike, Yosuke Okudaira
    • Journal Title

      Phys.Rev.Lett. 96

      Pages: 060503

    • Description
      「研究成果報告書概要(和文)」より
    • Peer Reviewed
  • [Journal Article] Yosuke Okudaira Time Optimal Quantum Evolution2006

    • Author(s)
      Alberto Carlini, Alcio Hosoya, Tatsuhiko Koike
    • Journal Title

      Phys.Rev.Lett.

      Pages: 060503

    • Description
      「研究成果報告書概要(欧文)」より
  • [Presentation] International Conference on Quantum And Bioinformation2007

    • Author(s)
      Quantum Brachistochrone
    • Organizer
      Science University
    • Place of Presentation
      NODA, Japan
    • Year and Date
      2007-05-19
    • Description
      「研究成果報告書概要(欧文)」より
  • [Presentation] Quantum Brachistochrone2007

    • Author(s)
      細谷 暁夫
    • Organizer
      Quantum and Bio Information(QUBIC)
    • Place of Presentation
      東京理科大
    • Year and Date
      2007-03-16
    • Description
      「研究成果報告書概要(和文)」より

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Published: 2010-02-04  

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