title: Stochastic resonant memory storage device.
abstract: We show that an extended system operating in the regime of stochastic resonance can act as a short-term memory device. The system under study is a ring of overdamped bistable oscillators coupled directionally, being each also subject to an external source of Gaussian white noise (the noise sources are independent). A single oscillator is driven by an external periodic force, 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 operates in a regime close to stochastic resonance. If noise is suppressed from any oscillator of the chain, the traveling wave is immediately damped. The ring is thus found to act as a short-term memory device in which the stored information (one bit, corresponding to the presence or absence of the external driving) is sustained by noise during a characteristic time T(mem).
authors.affiliation: Instituto de Ciencias, Universidad de General Sarmiento, Roca 850, 1663 San Miguel, Argentina. flor@ungs.edu.ar
authors.forename: M F
authors.initials: MF
authors.lastname: Carusela
authors.forename: R P
authors.initials: RP
authors.lastname: Perazzo
authors.forename: L
authors.initials: L
authors.lastname: Romanelli