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Thermodynamic forces and flows between a thermal bath and a squeezed thermal bath: Application to optomechanical systems

Shahidani, S ; Sharif University of Technology | 2022

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  1. Type of Document: Article
  2. DOI: 10.1103/PhysRevA.105.063516
  3. Publisher: American Physical Society , 2022
  4. Abstract:
  5. When a quantum system is coupled to two thermal baths at different temperatures, the temperature gradient as a thermodynamic force causes stationary heat flow within the system. We present a theoretical model to study how quantum features of squeezed thermal reservoirs affect the classical formulation of entropy production in terms of generalized forces and flows. Applying the quantum phase-space method to calculate Wigner entropy production helps us identify heat and squeezing fluxes and their corresponding generalized forces in terms of input-noise correlations of both reservoirs. Our study highlights the essential role played by the correlation of the input-noise operators of the thermal squeezed bath, which are asymmetric (squeezed and unsqueezed) and far from thermal equilibrium. Using the framework for an optomechanical system, we find the regime in which heat flows from the cold squeezed thermal bath to the hot thermal bath without violating the second law of thermodynamics and the regime in which entropy production is purely a quantum-mechanical effect. The results can be useful for improving the performance of Gaussian heat engines operating with squeezed thermal reservoirs. © 2022 American Physical Society
  6. Keywords:
  7. Entropy ; Heat engines ; Heat transfer ; Quantum optics ; Temperature ; Entropy production ; Generalized force ; Heat-flow ; Input noise ; Opto-mechanical systems ; Quantum system ; Thermal bath ; Thermal reservoir ; Thermodynamic flows ; Thermodynamic forces ; Phase space methods
  8. Source: Physical Review A ; Volume 105, Issue 6 , 2022 ; 24699926 (ISSN)
  9. URL: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.105.063516