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Journal of Modern Optics

Stochastic resonance with multiplicative noise in a three-level atomic bistable system

Haibin Wu, Amitabh Joshi, Min Xiao

Published Nov 10, 2007• 7 citations
Publisher

Abstract

We experimentally investigate stochastic resonance phenomenon with multiplicative noise in a Λ-type three-level atomic bistable system. The system perturbed by a periodic low frequency forcing term shows an improved signal-to-noise ratio at certain strength of the multiplicative noise applied onto the cavity frequency.
DOI
10.1080/09500340701656296

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Stochastic resonance (SR) is experimentally demonstrated in an atomic optical bistable system consisting of three-level atoms in $\ensuremath{\Lambda}$-type configuration confined in an optical ring cavity. The optical bistable system with enhanced Kerr nonlinearity due to atomic coherence is driven by a periodic signal and a Gaussian white noise source with variable amplitude, and displays an improved output signal-to-noise ratio, a characteristic signature of SR. The measured results match qualitatively with the theoretical predictions of the generic model for the SR phenomenon.
The stochastic resonance (SR) in an optical bistable system under the simultaneous action of multiplicative and additive noises and periodic signal is studied using the adiabatic approximation theory. The signal-to-noise ratio(SNR)is a non-monotonic function of intensity of additive noise, in which the SR phenomenon appears. The SNR decreased with the intensity of multiplicative noise, and SR phenomenon does not appear. So the effects of additive and multiplicative noise on the output SNR are different.
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