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Universal principles for sudden-quench quantum Otto engines.

R S Watson1, K V Kheruntsyan1

  • 1University of Queensland, School of Mathematics and Physics, Brisbane, Queensland 4072, Australia.

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This summary is machine-generated.

This study analyzes quantum Otto engines using a sudden-quench approximation. It reveals that interparticle correlations determine engine work, offering universal efficiency bounds for many-body quantum models.

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Area of Science:

  • Quantum Thermodynamics
  • Many-Body Physics
  • Statistical Mechanics

Background:

  • Quantum Otto engines are theoretical devices exploring quantum effects in thermodynamics.
  • Previous studies focused on specific interaction models for Otto cycles.
  • Understanding universal performance characteristics is crucial for quantum engine design.

Purpose of the Study:

  • To provide a general analysis of quantum Otto engine performance using a sudden-quench approximation.
  • To extend existing results to generic many-body interacting quantum models.
  • To establish universal bounds on the operational efficiency of quantum engines.

Main Methods:

  • Application of a sudden-quench approximation to unitary work strokes.
  • Analysis of arbitrary quantum models with two-body interactions.
  • Extension to generic many-body interacting quantum systems and control over various quantum operators.

Main Results:

  • Net work in quantum Otto engine cycles is determined by interparticle correlations.
  • Universal bounds on operation efficiency are derived for many-body interacting quantum models.
  • Spin polarization in a spin-1/2 Fermi gas significantly enhances engine performance.

Conclusions:

  • The derived principles for sudden-quench two-body interactions apply universally to all quantum Otto engine cycles.
  • Control over interparticle correlations and system Hamiltonian operators offers avenues for performance enhancement.
  • This framework provides a universal approach to analyzing quantum engine efficiency.