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Area of Science:

  • Quantum thermodynamics
  • Quantum information
  • Thermodynamic cycles

Background:

  • Quantum Otto refrigerators are theoretical devices for quantum cooling.
  • Squeezed reservoirs can alter thermodynamic properties.
  • The coefficient of performance (COP) quantifies refrigerator efficiency.

Purpose of the Study:

  • To evaluate the performance of a quantum Otto refrigerator coupled to a squeezed cold reservoir.
  • To analyze the impact of reservoir squeezing on the COP.
  • To investigate apparent violations of the second law of thermodynamics.

Main Methods:

  • Utilizing the χ figure of merit for performance evaluation.
  • Analyzing the quantum Otto cycle with a squeezed thermal bath.
  • Investigating the frequency-dependent temperature of the squeezed bath.

Main Results:

  • Squeezing significantly enhances the COP, surpassing the standard Carnot COP.
  • At maximum squeezing, work input vanishes while cooling rate remains finite.
  • This phenomenon is explained by the non-equilibrium and frequency-dependent nature of the squeezed bath.

Conclusions:

  • The enhanced COP is consistent with the second law of thermodynamics.
  • The maximum COP achieved is of the Curzon-Ahlborn type.
  • Squeezing leads to a nuanced understanding of thermodynamic limits in quantum systems.