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Stochastic resonant memory storage device.

M F Carusela1, R P Perazzo, L Romanelli

  • 1Instituto de Ciencias, Universidad de General Sarmiento, Roca 850, 1663 San Miguel, Argentina. flor@ungs.edu.ar

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|October 3, 2001
PubMed
Summary

This study demonstrates that a ring of coupled oscillators, utilizing stochastic resonance, can function as a short-term memory. Noise sustains information, enabling the system to act as a memory device.

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Area of Science:

  • Complex systems
  • Nonlinear dynamics
  • Statistical physics

Background:

  • Stochastic resonance is a phenomenon where noise enhances the response of a nonlinear system to a weak signal.
  • Extended systems offer unique possibilities for information processing and memory.
  • Bistable oscillators are fundamental units in many physical and biological systems.

Purpose of the Study:

  • To investigate the potential of an extended system operating in the stochastic resonance regime as a short-term memory device.
  • To analyze the role of noise in sustaining information within a coupled oscillator ring.
  • To determine the conditions under which such a system can store and retain information.

Main Methods:

  • Modeling a ring of directionally coupled, overdamped bistable oscillators.

Related Experiment Videos

  • Subjecting each oscillator to independent Gaussian white noise.
  • Applying an external periodic force to a single oscillator for a limited duration.
  • Analyzing the transmission of traveling waves and the damping behavior within the system.

    • Main Results:

    • A traveling wave can be transmitted multiple times along the ring with minimal damping when the driven oscillator is near stochastic resonance.
    • Suppression of noise in any oscillator leads to immediate damping of the traveling wave.
    • The system effectively stores one bit of information (presence/absence of driving force) sustained by noise.

    Conclusions:

    • An extended system of coupled bistable oscillators near stochastic resonance can function as a noise-sustained short-term memory.
    • Noise is crucial for the information retention capabilities of this memory device.
    • The characteristic memory time T(mem) depends on the system's parameters and noise levels.