High-frequency stochastic resonance in SQUIDs I.Kh.Kaufman *† , D G Luchinsky *† , P V E McClintock *‡ , S M Soskin *§ and N D Stein * Abstract 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, tunable, range of high frequencies in highly underdamped SQUIDs that need not necessarily be bistable. * School of Physics and Chemistry, Lancaster University, Lancaster, LA1 4YB, UK. † Permanent address: Russian Research Institute for Metrological Service, Andreevskaya nab.2, 117965 Moscow, Russia. ‡ To whom corrrespondence should be addressed. § Permanent address: Institute of Semiconductor Physics, Ukrainian National Academy of Sciences, Kiev, Ukraine. 1 Published in Phys. Lett. A 220, 219-223 (1996).