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This study explores how information influences work extraction in quantum systems. Measuring a small part of the input is the most effective way to convert thermal noise into useful work.

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Area of Science:

  • Quantum mechanics
  • Thermodynamics
  • Information theory

Background:

  • Investigating the interplay between work and information in quantum systems is crucial for understanding energy conversion.
  • Minimal quantum-mechanical setups offer a controlled environment to study fundamental principles of thermodynamics.

Purpose of the Study:

  • To elucidate the relationship between work and information in a quantum heat-to-work converter.
  • To determine how information can act as a resource or be redundant for work extraction.
  • To optimize work extraction strategies using acquired information and analyze efficiency-power trade-offs.

Main Methods:

  • Utilizing a minimal quantum-mechanical setup with hot and cold oscillator modes.
  • Comparing different measurement strategies for work extraction efficiency and power limitations.
  • Allowing for the cost of information erasure and analyzing nonselective measurements.

Main Results:

  • Extraction of work by observation and feedforward, measuring only a fraction of the input, is advantageous.
  • Different measurement strategies yield varying work extraction efficiencies and power limitations.
  • The cost of information erasure is considered in the analysis.

Conclusions:

  • Optimized homodyning provides a method for efficient work extraction from quantum systems.
  • The findings suggest practical strategies for converting thermal noise to useful work in optical, optomechanical, and photovoltaic devices.