Thermal noise suppression: how much does it cost?

Details Thermal noise suppression: how much does it cost? Thermal noise suppression: how much does it cost?

2007-11-06

arxiv.org/abs/0711.0923v2

Giovanni Volpe et al 2009 J. Phys. A: Math. Theor. 42 095005 (8pp)

Physics

Condensed Matter

Statistical Mechanics

6 pages

Scientific paper

10.1088/1751-8113/42/9/095005

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.

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