Extracting work optimally with imprecise measurements

Abstract

Measurement and feedback allows an external agent to extract work from a system in contact with a single thermal bath. The maximum amount of work that can be extracted in a single measurement and the corresponding feedback loop is given by the information acquired via the measurement, a result that manifests the close relation between information theory and stochastic thermodynamics. In this paper we show how to reversibly confine a Brownian particle in an optical tweezer potential and then extract the corresponding increase of the free energy as work. By repeatedly tracking the position of the particle and modifying the potential accordingly, we can extract work optimally even with a high degree of inaccuracy in the measurements.

arXiv comment13 pages, 6 figures. Published in Entropy (open access)

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Cited by in corpus (5)

• Maximal fluctuation exploitation in Gaussian information engines
• Geometric Brownian Information Engine: Essentials for the best performance
• Driven particle in a one dimensional periodic potential with feedback control: efficiency and power optimization
• Markovian description of a wide class of feedback-controlled systems: Application to the feedback flashing ratchet
• Energetics of Feedback: Application to Memory Erasure