Stochastic resonance in an RF SQUID with shunted ScS junction

Abstract

Using a point (superconductor-constriction-superconductor, ScS) contact in a single-Josephson-junction superconducting quantum interference device (RF SQUID) provides stochastic resonance conditions at any arbitrary small value of loop inductance and contact critical current, unlike SQUIDs with more traditional tunnel (superconductor-insulator-superconductor, SIS) junctions. This is due to the unusual potential energy of the ScS RF SQUID which always has a barrier between two wells thus making the device bistable. This paper presents the results of a numerical simulation of the stochastic dynamics of the magnetic flux in an ScS RF SQUID loop affected by band-limited white Gaussian noise and low-frequency sine signals of small and moderate amplitudes. The difference in stochastic amplification of RF SQUID loops incorporating ScS and SIS junctions is discussed.

9 pages, 6 figures, published in Physica A. Some changes and additions are made to the text, Fig.3 is changed, mistypings are excluded in version 2

References in corpus (3)

• Introduction to the theory of stochastic processes and Brownian motion problems
• Superconducting Quantum Point Contacts
• Quantum superposition of three macroscopic states and superconducting qutrit detector

Cited by in corpus (1)

• Experimental observation of induced stochastic transitions in multi-well potential of RF SQUID loop