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Thermal noise suppression: How much does it cost?

Journal article
Authors Giovanni Volpe
Jan Wehr
Dmitri Petrov
J. Miguel Rubi
Published in Journal of Physics A: Mathematical and Theoretical
Volume 42
ISSN 17518113
Publication year 2009
Published at
Language en
Subject categories Physical Sciences

Abstract

In order to stabilize the behavior of noisy systems, confining it around a desirable state, an effort is required to suppress the intrinsic noise. This noise suppression task entails a cost. For the important case of thermal noise in an overdamped system, we show that the minimum cost is achieved when the system control parameters are held constant: any additional deterministic or random modulation produces an increase of the cost. We discuss the implications of this phenomenon for those overdamped systems whose control parameters are intrinsically noisy, presenting a case study based on the example of a Brownian particle optically trapped in an oscillating potential. © 2009 IOP Publishing Ltd.

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