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1992 Fiscal Year Final Research Report Summary

Optical Communication Systems Using Quantum State Control

Research Project

Project/Area Number 02805040
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 電子通信系統工学
Research InstitutionKeio University

Principal Investigator

NAKAGAWA Masao  Keio University, Electrical Engineering, Professor, 理工学部・電気工学科, 教授 (30051882)

Co-Investigator(Kenkyū-buntansha) HIROTA Osamu  Tamagawa University, Information & Communication Engineering, Professor, 工学部・情報通信工学科, 教授 (40114889)
Project Period (FY) 1990 – 1992
KeywordsQuantum state control communication / Squeezed light / Standard quantum limit
Research Abstract

This research is classified as the field of the quantum communication which has been studied by Yuen, Helstrom, and Hirota since 1974. In this research, we have clarified many new results for high quality optical communication system by using quantum state control which was proposed by Tamagawa University in 1988, and has been developed by Keio University, Tamagawa University, Tokyo Inst.Tech. and Yamanashi University since 1990. This project has been accomplished as a research cooperation between Keio University and Tamagawa University. As a result we have obtained the following results.
1. Properties of degenerate parametric amplifier and optical bistability were investigated. As a result, we showed conditions of generation of squeezed light and squeezing the quantum noise over wide bandwidth of them.
2. When the light with quantum state control is transmitted, its superior properties are destroyed by the transmission loss. Therefore the degradations of system performance should be clarified with respect to the degree of loss. We showed that the performance of the systems using the quantum state controlled light is superior to the standard quantum limit with any amount of loss.
3. We showed some examples of the received quantum state control systems which has been proposed by Hirota
4. We investigated the properties of the conditional unitary process which was defined by Hirota and showed that the linear attenuation process is one of the examples.
5. In order to realize the received quantum state control, the reduction of the inner product of the input quantum states is required. It was pointed out that the nonlinear beamsplitter is one of examples of the reduction phenomena of the inner product.
6. Some modulation schemes of squeezed light were proposed for optical communication and measurement systems. Their spectrum transformations through the modulations were derived. The optimum condition for modulation was also given.

  • Research Products

    (17 results)

All Other

All Publications (17 results)

  • [Publications] S.Bun: "A Realization of Optical Communication Using Received Quantum State Control" Transactions of IEICE. E73. 1647-1656 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] O.Hirota: "Some remarks on a conditional unitary operator" Physics Letters A. 155. 343-347 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 児矢野 英典: "量子通信用縮退パラメトリック増幅器のスクィジング特性の解析" 電子情報通信学会論文誌B-I. J74-B-I. 475-484 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Sasaki: "An Optical Receiver Overcome the Standard Quantum Limit" Transactions of IEICE. E75-B. 514-520 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Osaki: "Realization of a conditional unitary process by systems of Collett and Knight" Journal of Modern Optics. 39. 1555-1566 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 大崎 正雄: "減衰量子チャンネルの新しい作用素表現に関する考察" 電子情報通信学会論文誌A. (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Osaki: "Some Ideas of Modulation Systems for Quantum Communication" Transactions of IEICE. (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 広田 修: "スクィズド光" 森北出版株式会社, 229 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] C.Bendjaballah: "Lecture Note in Physics 378,Quantum Aspects of Optical Communications" Springer-Verlag, 385 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] O.Hirota: "Sgueezed Light" ELSEVIER, 267 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.Bun: "A Realization of Optical Communication Using Received Quantum State Control" Transactions of IEICE. vol.E73. 1647-1656 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] O.Hirota: "Some Remarks on a Conditional Unitary Operator" Physics Letters A. vol.155. 343-347 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Koyano: "Analysis on Squeezing Properties of Degenerate Parametric Amplifier for Quantum Communication" Transactions of IEICE. vol.J74-B-I. 475-484 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Sasaki: "An Optical Receiver Overcome the Standard Quantum Limit" Transactions of IEICE. vol.E75-B. 514-520 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Osaki: "Realization of a Conditional Unitary Process by Systems of Collet and Knight" Journal of Modern Optics. vol.39. 1555-1566 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Osaki: "A Study for New Operator Representation on the Linear Attenuation Quantum Channel" Transactions of IEICE. (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Osaki: "Some Ideas of Modulation Systems for Quantum Communication" Transactions of IEICE. (1993)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1994-03-24  

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