Two-level quantum Otto heat engine operating with unit efficiency far from the quasi-static regime under a squeezed reservoir

Abstract

Recent theoretical and experimental studies in quantum heat engines show that, in the quasi-static regime, it is possible to have higher efficiency than the limit imposed by Carnot, provided that engineered reservoirs are used. The quasi-static regime, however, is a strong limitation to the operation of heat engines, since infinitely long time is required to complete a cycle. In this paper we propose a two-level model as the working substance to perform a quantum Otto heat engine surrounded by a cold thermal reservoir and a squeezed hot thermal reservoir. Taking advantage of this model we show a striking achievement, that is to attain unity efficiency even at non null power.

arXiv comment5 pages, 5 figures

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• A quantum Otto-type heat engine with fixed frequency
• Advancing Quantum Otto Engine Performance via Additional Magnetic Field and Effective Negative Temperature
• Availing non-Markovian dynamics in effective negative temperature-based transient quantum Otto engines
• Quantum Otto Thermal Machines Powered by Kerr Nonlinearity