Squeezing as the source of inefficiency in the quantum Otto cycle

Article

关键词: HEAT ENGINES;    FREQUENCY;    INFORMATION;    PHYSICS;    STATES;   

DOI  :  10.1103/PhysRevB.86.014501

来源: SCIE

【 摘 要 】

The availability of controllable macroscopic devices, which maintain quantum coherence over relatively long time intervals, for the first time allows an experimental realization of many effects previously considered only as gedanken experiments, such as the operation of quantum heat engines. The theoretical efficiency eta of quantum heat engines is restricted by the same Carnot boundary eta(C) as for the classical ones: any deviations from quasistatic evolution suppressing eta below eta(C). Here we investigate an implementation of an analog of the Otto cycle in a tunable quantum coherent circuit and show that the specific source of inefficiency is the quantum squeezing of the thermal state due to the finite speed of compression/expansion of the system.

【 授权许可】

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