Research of Superconductive Chaos Generator Device "Josephson Tetrode"
Research of Superconductive Chaos Generator Device "Josephson Tetrode"
批准号:
15560305
负责人:
YOSHIMORI Shigeru
金额:
$2.3万
依托单位:
依托单位国家:
日本
项目类别:
Grant-in-Aid for Scientific Research (C)
财政年份:
2003
资助国家:
日本
项目状态:
已结题
起止时间:
2003 至 2005
中文摘要
在本研究计画中,数值模拟了由五个约瑟夫森弱连接结所组成的四端超导元件“约瑟夫森四极管”中混沌的产生。该器件采用两个弱连接结串联、三个弱连接结并联的结构,可用于产生频率为几百GHz的超快随机信号。当其中一个正常电阻变化时,计算了跨结的电压的动态。利用分岔图、三维吸引子和Poincare截面证实了混沌的产生,分岔图可以解释为混沌的准周期性破裂现象。混沌产生的机理是三个独立的跨接电压之间的非线性频率混合。为此,将二维Ginzburg-Landau方程应用于阶跃边约瑟夫森结,并得到了解析解。计算了临界电流的电流-相位关系和温度依赖性。
英文摘要
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.
期刊论文(6)
专著(0)
科研奖励(0)
会议论文
Chaotic Oscillations in Josephson Tetrode
约瑟夫森四极管中的混沌振荡
DOI:
--
发表时间:
2004
期刊:
IEEE Trans. Appl. Super. Vol.14 No.12
影响因子:
--
作者:
[A.Uchida, H.Iida, N.Maki, M.Osawa, S.Yoshimori]
通讯作者:
S.Yoshimori
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)
A.Uchida、K.Higa、T.Shiba、S.Yoshimori:“He-Ne 激光器中混沌的广义同步”物理评论 E. 68・1-2(2003 年)
DOI:
--
发表时间:
期刊:
影响因子:
--
作者:
[]
通讯作者:
DOI:
10.1109/jqe.2006.870226
发表时间:
2006-03
期刊:
IEEE Journal of Quantum Electronics
影响因子:
2.5
作者:
[N. Shibasaki;A. Uchida;S. Yoshimori;P. Davis]
通讯作者:
N. Shibasaki;A. Uchida;S. Yoshimori;P. Davis
Application of Superconducting Chaos Generator "Josephson Tetrode" to Secret Communication
-
批准号:18560345
-
项目类别:Grant-in-Aid for Scientific Research (C)
-
资助金额:$2.6万
-
财政年份:2006
-
负责人:YOSHIMORI Shigeru
-
依托单位:
海外基金