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High frequency stochastic resonance in SQUIDs

Research output: Contribution to journalJournal article


Journal publication date9/09/1996
JournalPhysics Letters A
Number of pages5
Original languageEnglish


It is shown theoretically and by analogue electronic experiment that stochastic resonance (SR), in which a weak periodic signal can be optimally enhanced by the addition of noise of appropriate intensity, is to be anticipated in underdamped SQUIDs (superconducting quantum interference devices). It manifests under conditions quite unlike those needed for classical SR, which is restricted to low frequencies and confined to systems that are both overdamped and bistable. The zero-dispersion SR reported here can be expected over a vastly wider, tuneable, range of high frequencies in highly underdamped SQUIDs that need not necessarily be bistable.