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Maxwell's Lesser Demon: A Quantum Engine Driven by Pointer Measurements.

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This study introduces a measurement-driven quantum engine using a spin-boson model. The engine generates work from thermal excitations, achieving high power and efficiency even in challenging temperature regimes.

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Area of Science:

  • Quantum thermodynamics
  • Statistical mechanics
  • Mesoscopic physics

Background:

  • Measurement plays a crucial role in quantum thermodynamics.
  • Quantum engines offer a pathway to harness quantum phenomena for work extraction.
  • Understanding the interplay between measurement, feedback, and thermodynamics is essential for developing novel quantum devices.

Purpose of the Study:

  • To propose and analyze a self-contained spin-boson model for a measurement-driven quantum engine.
  • To investigate the performance of an engine limited to pointer measurements.
  • To explore the engine's ability to generate work from thermal excitations and compare it with existing quantum engines.

Main Methods:

  • Development of a theoretical spin-boson model.
  • Incorporation of a 'demon' utilizing measurement and feedback control.
  • Restriction of the demon's actions to pointer measurements on a damped mechanical oscillator.
  • Analysis of work generation, power, and efficiency.

Main Results:

  • The proposed engine successfully generates work from thermal excitations of a quantum spin.
  • The engine achieves simultaneous power and efficiency benchmarks.
  • The engine operates effectively in temperature regimes where quantum Otto engines fail.

Conclusions:

  • Measurement-driven engines, even with restricted measurement capabilities, can be highly efficient.
  • This model offers a novel approach to quantum heat engines operating under non-ideal measurement conditions.
  • The findings have implications for the design of future quantum thermal devices.