Stochastic resonant memory storage device - art. no. 031101

We show that an extended system operating in the regime of stochastic reson ance can act as a short-term memory device. The system under study is a rin g of overdamped bistable oscillators coupled directionally, being each also subject to an external source of Gaussian white noise (the noise sources a re independent). A single oscillator is driven by an external periodic forc e, assumed to act only over the time that the signal takes to traverse the whole ring. A traveling wave is then found to be transmitted several times along the ring with a small damping, provided that the driven oscillator op erates in a regime close to stochastic resonance. If noise is suppressed fr om any oscillator of the chain, the traveling wave is immediately damped. T he ring is thus found to act as a short-term memory device in which the sto red information (one bit, corresponding to the presence or absence of the e xternal driving) is sustained by noise during a characteristic time T-mem.