Information and maximum power in a feedback controlled Brownian ratchet

Details Information and maximum power in a feedback controlled Brownian ratchet Information and maximum power in a feedback controlled Brownian ratchet

2007-03-28

arxiv.org/abs/cond-mat/0703758v2

Eur. Phys. J. B 59, 63-68 (2007)

Physics

Condensed Matter

Statistical Mechanics

LaTeX, 6 pages, 4 figures, improved version to appear in Eur. Phys. J. B

Scientific paper

10.1140/epjb/e2007-00255-7

Closed-loop or feedback controlled ratchets are Brownian motors that operate using information about the state of the system. For these ratchets, we compute the power output and we investigate its relation with the information used in the feedback control. We get analytical expressions for one-particle and few-particle flashing ratchets, and we find that the maximum power output has an upper bound proportional to the information. In addition, we show that the increase of the power output that results from changing the optimal open-loop ratchet to a closed-loop ratchet also has an upper bound that is linear in the information.

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