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Research of Superconductive Chaos Generator Device "Josephson Tetrode"

Research Project

Project/Area Number 15560305
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Electron device/Electronic equipment
Research InstitutionTakushoku University

Principal Investigator

YOSHIMORI Shigeru  Takushoku University, Faculty of Engineering, Professor, 工学部, 教授 (00167024)

Project Period (FY) 2003 – 2005
Project Status Completed (Fiscal Year 2005)
Budget Amount *help
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2005: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 2004: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 2003: ¥1,100,000 (Direct Cost: ¥1,100,000)
KeywordsJosephson Tetrode / Josephson effect / Chaos / Nonlinear dynamics / Chaos attractor / GL theory / Margin of generation / Bifurcation diagram / 動作マージン / リアプノフスペクトル / 決定論的カオス / FFT / 最大リアプノフ数 / ヤコビアン / カルダノ法
Research Abstract

In this research project, the generation of chaos in "Josephson tetrode", a four-terminal superconductive device made of five Josephson weak-link junctions was numerically demonstrated. This novel superconductive device can be applied to ultra-fast random signal generations at frequencies of hundreds of gigahertz.
In the Josephson tetrode, two weak-link junctions are series-connected and other three junctions are parallel-connected. The dynamics of electrical voltages across the junctions were calculated when one of the normal resistances was varied. The generation of chaos was confirmed by using a bifurcation diagram, three-dimensional attractors and the Poincare sections.
The bifurcation diagram can be interpreted as the quasi-periodicity-breakdown scenerio to chaos. The mechanism of chaos generation is a nonlinear frequency mixing among three independent voltages across the junctions.
The Josephson tetrode was made of five step-edge type Josephson junctions. So two-dimensional Ginzburg-Landau equation was applied to the step-edge Josephson junction and the solution was analytically derived. The current-phase relationship and temperature dependence of the critical current were calculated.

Report

(4 results)
  • 2005 Annual Research Report   Final Research Report Summary
  • 2004 Annual Research Report
  • 2003 Annual Research Report
  • Research Products

    (5 results)

All 2006 2004 Other

All Journal Article (4 results) Publications (1 results)

  • [Journal Article] Characteristics of chaos synchronization in semiconductor lasers subject to polarization-rotated optical feedback2006

    • Author(s)
      N.Shibasaki, A.Uchida, S.Yoshimori, P.Davis
    • Journal Title

      IEEE J. Quantum Electronics Vol.42 Issue 3

      Pages: 342-350

    • NAID

      110006405612

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Chaotic Oscillations in Josephson Tetrode2004

    • Author(s)
      A.Uchida, H.Iida, N.Maki, M.Osawa, S.Yoshimori
    • Journal Title

      IEEE Trans. Appl. Super. Vol.14 No.12

      Pages: 2064-2070

    • NAID

      110003187641

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Chaotic oscillations in Josephson Tetrode2004

    • Author(s)
      Atsushi Uchida, Hidetoshi Iida, Natsuko Maki, Masayuki Osawa, Shigeru Yoshimori
    • Journal Title

      IEEE Trans.Appl.Super. Vol.14,No.12

      Pages: 2064-2070

    • NAID

      110003187641

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Chaotic Oscillations in Josephson Tetrode2004

    • Author(s)
      A.Uchida, H.Iida, N.Maki, M.Osawa, S.Yoshimori
    • Journal Title

      IEEE Transactions on Applied Superconductivity Vol.14,No.4

      Pages: 2064-2070

    • NAID

      110003187641

    • Related Report
      2004 Annual Research Report
  • [Publications] A.Uchida, K.Higa, T.Shiba, S.Yoshimori: "Generalized synchronization of chaos in He-Ne lasers"Physical Review E. 68・1-2. 016215-1-016215-7 (2003)

    • Related Report
      2003 Annual Research Report

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Published: 2003-04-01   Modified: 2016-04-21  

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