中国物理B ›› 2023, Vol. 32 ›› Issue (10): 100702-100702.doi: 10.1088/1674-1056/acc7f8

• • 上一篇    下一篇

Quantum Stirling heat engine with squeezed thermal reservoir

Nikolaos Papadatos   

  1. Department of Physics, University of Patras, 26500 Greece
  • 收稿日期:2022-11-14 修回日期:2023-02-13 接受日期:2023-03-28 出版日期:2023-09-21 发布日期:2023-09-27
  • 通讯作者: Nikolaos Papadatos E-mail:n.papadatos@upatras.gr

Quantum Stirling heat engine with squeezed thermal reservoir

Nikolaos Papadatos   

  1. Department of Physics, University of Patras, 26500 Greece
  • Received:2022-11-14 Revised:2023-02-13 Accepted:2023-03-28 Online:2023-09-21 Published:2023-09-27
  • Contact: Nikolaos Papadatos E-mail:n.papadatos@upatras.gr

摘要: We analyze the performance of a quantum Stirling heat engine (QSHE), using a two-level system and a harmonic oscillator as the working medium, that is in contact with a squeezed thermal reservoir and a cold reservoir. First, we derive closed-form expressions for the produced work and efficiency, which strongly depend on the squeezing parameter $r_{\rm h}$. Then, we prove that the effect of squeezing heats the working medium to a higher effective temperature, which leads to better overall performance. In particular, the efficiency increases with the degree of squeezing, surpassing the standard Carnot limit when the ratio of the temperatures of the hot and cold reservoirs is small. Furthermore, we derive the analytical expressions for the efficiency at maximum work and the maximum produced work in the high and low temperature regimes, and we find that at extreme temperatures the squeezing parameter $r_{\rm h}$ does not affect the performance of the QSHE. Finally, the performance of the QSHE depends on the nature of the working medium.

关键词: quantum heat engine, open systems, thermodynamics, performance characteristics

Abstract: We analyze the performance of a quantum Stirling heat engine (QSHE), using a two-level system and a harmonic oscillator as the working medium, that is in contact with a squeezed thermal reservoir and a cold reservoir. First, we derive closed-form expressions for the produced work and efficiency, which strongly depend on the squeezing parameter $r_{\rm h}$. Then, we prove that the effect of squeezing heats the working medium to a higher effective temperature, which leads to better overall performance. In particular, the efficiency increases with the degree of squeezing, surpassing the standard Carnot limit when the ratio of the temperatures of the hot and cold reservoirs is small. Furthermore, we derive the analytical expressions for the efficiency at maximum work and the maximum produced work in the high and low temperature regimes, and we find that at extreme temperatures the squeezing parameter $r_{\rm h}$ does not affect the performance of the QSHE. Finally, the performance of the QSHE depends on the nature of the working medium.

Key words: quantum heat engine, open systems, thermodynamics, performance characteristics

中图分类号:  (Heat engines; heat pumps; heat pipes)

  • 07.20.Pe
03.65.Yz (Decoherence; open systems; quantum statistical methods) 05.70.-a (Thermodynamics)