Finite-time quantum Otto engine: Surpassing the quasistatic efficiency due to friction

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In finite-time quantum heat engines, some work is consumed to drive a working fluid accompanying coherence, which is called "friction." To understand the role of friction in quantum thermodynamics, we present a couple of finite-time quantum Otto cycles with two different baths: Agarwal versus Lindbladian. We solve them exactly and compare the performance of the Agarwal engine with that of the Lindbladian engine. In particular, we find remarkable and counterintuitive results that the performance of the Agarwal engine due to friction can be much higher than that in the quasistatic limit with the Otto efficiency, and the power of the Lindbladian engine can be nonzero in the short-time limit. Based on additional numerical calculations of these outcomes, we discuss possible origins of such differences between two engines and reveal them. Our results imply that, even with an equilibrium bath, a nonequilibrium working fluid brings on the higher performance than what an equilibrium working fluid does.
Publisher
AMER PHYSICAL SOC
Issue Date
2020-02
Language
English
Article Type
Article
Citation

PHYSICAL REVIEW E, v.101, no.2

ISSN
2470-0045
DOI
10.1103/PhysRevE.101.022127
URI
http://hdl.handle.net/10203/273717
Appears in Collection
PH-Journal Papers(저널논문)
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