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Squeezing as the source of inefficiency in the quantum Otto cycle
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 the...
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Published in: | Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2012-07, Vol.86 (1), Article 014501 |
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Main Authors: | , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | 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. |
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ISSN: | 1098-0121 1550-235X |
DOI: | 10.1103/PhysRevB.86.014501 |