Quantum Performance of Thermal Machines over Many Cycles

Abstract

The performance of quantum heat engines is generally based on the analysis of a single cycle. We challenge this approach by showing that the total work performed by a quantum engine need not be proportional to the number of cycles. Furthermore, optimizing the engine over multiple cycles leads to the identification of scenarios with a quantum enhancement. We demonstrate our findings with a quantum Otto engine based on a two-level system as the working substance that supplies power to an external oscillator.

arXiv comment5 pages, 3 figures; published in Phys. Rev. Lett. as an Editors' Suggestion

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