Given a quantum heat engine that operates in a cycle that reaches maximal eciency for a timedependent Hamiltonian H(t) of the working substance, with overall controllable driving H(t) = g(t)H, we study the deviation of the eciency from the optimal value due to a generic time-independent perturbation in the Hamiltonian. We show that for a working substance consisting of two two-level systems, by suitably tuning the interaction, the deviation can be suppressed up to the third order in the perturbation parameter-and thus almost retaining the optimality of the engine.

Impact of nonideal cycles on the efficiency of quantum heat engines

Marcantoni S.;Benatti F.
;
Floreanini R.;PETIZIOL, FRANCESCO;
2019-01-01

Abstract

Given a quantum heat engine that operates in a cycle that reaches maximal eciency for a timedependent Hamiltonian H(t) of the working substance, with overall controllable driving H(t) = g(t)H, we study the deviation of the eciency from the optimal value due to a generic time-independent perturbation in the Hamiltonian. We show that for a working substance consisting of two two-level systems, by suitably tuning the interaction, the deviation can be suppressed up to the third order in the perturbation parameter-and thus almost retaining the optimality of the engine.
2019
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https://link.springer.com/article/10.1140/epjd/e2019-90520-7#copyrightInformation
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/2952584
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