Europhys. Lett.
Volume 74, Number 6, June 2006
Page(s) 937 - 943
Section General
Published online 12 May 2006
Europhys. Lett., 74 (6), pp. 937-943 (2006)
DOI: 10.1209/epl/i2006-10052-6

Stochastic resonance vs. resonant activation

C. Schmitt1, B. Dybiec2, P. Hänggi3 and C. Bechinger1

1  2. Physikalisches Institut, Universität Stuttgart - Pfaffenwaldring 57 70569 Stuttgart, Germany
2  Marian Smoluchowski Institute of Physics and Mark Kac Center for Complex Systems Research, Jagellonian University - ul. Reymonta 4, 30-059 Kraków, Poland
3  Institut für Physik, Universität Augsburg - Universitätsstr. 1 86135 Augsburg, Germany

received 27 February 2006; accepted in final form 20 April 2006
published online 12 May 2006

The phenomenon of stochastic resonance by which it is possible to boost the transduction of information by tuning into noise is experimentally and numerically contrasted with the phenomenon of resonant activation, i.e. the occurrence of a minimal, averaged residence time at an optimal time-scale in the presence of barrier modulations. The experimental system consists of a periodically modulated bistable colloidal Brownian dynamics. Interestingly enough, the two phenomena may occur simultaneously in the same system, although typically in quite different parameter regimes.

02.50.Ey - Stochastic processes.
82.20.Uv - Stochastic theories of rate constants.
82.70.Dd - Colloids.

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