Chaos and noise in Josephson tunnel junctions
The current-voltage characteristics of Josephson tunnel junctions shunted by a conductance with substantial self-inductance exhibit regions of stable negative resistance. At certain values of bias current, the junctions exhibit chaos, which is manifested as a low frequency voltage noise equivalent to a noise temperature of about 10/sup 3/K. At other bias points, switching between subharmonic modes or between a subharmonic mode and a chaotic regime produces low frequency noise with a noise temperature often exceeding 10/sup 6/K. Analog simulations indicate that, at least under some conditions, the switching is induced by intrinsic thermal noise. The analog has also been used to show that switching induced by thermal noie is responsible for the noise rise observed experimentally in three-photon Josephson parametric amplifiers.
- Research Organization:
- Lawrence Berkeley Lab., CA (USA); IBM Watson Research Center, Yorktown Heights, NY (USA)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 6262280
- Report Number(s):
- LBL-16127; CONF-830595-1; ON: DE83013686
- Resource Relation:
- 7. international conference on noise in physical systems, Montpellier, France, 16 May 1983
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AMPLIFICATION
AMPLIFIERS
CURRENTS
ELECTRIC CURRENTS
ELECTRIC POTENTIAL
ELECTRICAL PROPERTIES
ELECTRONIC EQUIPMENT
EQUIPMENT
GAIN
JOSEPHSON JUNCTIONS
JUNCTIONS
NOISE
PARAMETRIC AMPLIFIERS
PHYSICAL PROPERTIES
SUPERCONDUCTING JUNCTIONS
TUNNEL EFFECT