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Extracting Work Optimally with Imprecise Measurements.

Luis Dinis1,2, Juan Manuel Rodríguez Parrondo1,2

  • 1Grupo Interdisciplinar de Sistemas Complejos, Facultad de Ciencias Físicas, 28040 Madrid, Spain.

Entropy (Basel, Switzerland)
|December 30, 2020
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Summary
This summary is machine-generated.

External agents can extract work from systems using measurement and feedback. This study demonstrates optimal work extraction from a Brownian particle using an optical tweezer, even with measurement inaccuracies.

Keywords:
Brownian particleconfinementinformation theorystochastic thermodynamics

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Area of Science:

  • Physics
  • Thermodynamics
  • Information Theory

Background:

  • Measurement and feedback enable work extraction from systems interacting with a thermal bath.
  • Information acquired during measurement dictates maximum extractable work, linking information theory and stochastic thermodynamics.

Purpose of the Study:

  • To demonstrate reversible confinement of a Brownian particle in an optical tweezer.
  • To extract the associated free energy increase as work.

Main Methods:

  • Utilizing an optical tweezer to reversibly confine a Brownian particle.
  • Repeatedly tracking particle position and adjusting the optical potential.
  • Applying principles of stochastic thermodynamics and information theory.

Main Results:

  • Successfully extracted work from the Brownian particle's free energy increase.
  • Achieved optimal work extraction despite potential measurement inaccuracies.
  • Demonstrated the practical application of information-driven feedback for work extraction.

Conclusions:

  • Measurement and feedback are crucial for extracting work from thermal systems.
  • Information-theoretic approaches can optimize work extraction processes.
  • This method provides a pathway for efficient energy harvesting at the nanoscale.