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Klaus Mølmer

Revealing the strokes of autonomous quantum heat engines with work and heat fluctuations

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We analyze an autonomous thermoelectric engine composed of two superconducting qubits coupled to separate heat baths and connected by a Josephson junction. Work and heat are process quantities and not observables of the engine quantum system, but their rates can be derived from the steady-state expectation value of appropriate system observables, and their fluctuations are given by correlation functions determined by the master equation and quantum regression theorem of open quantum systems. Underneath the constant steady state of the system, the temporal correlation functions reveal a cyclical, dynamical transfer of energy - the strokes of the engine.

TidsskriftPhysical Review A
StatusUdgivet - 14 jan. 2020

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