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Paper   IPM / Physic / 15973
School of Physics
  Title:   Impact of nonideal cycles on the efficiency of quantum heat engines
1.  M. Ramezani
2.  S. Marcantoni
3.  F. Benatti
4.  R. Floreanini
5.  F. Petiziol
6.  A.T. Rezakhani
7.  M. Golshani
  Status:   Published
  Journal: Eur. Phys. J. D
  Vol.:  73
  Year:  2019
  Pages:   144
  Supported by:  IPM
Given a quantum heat engine that operates in a cycle that reaches maximal efficiency for a time-dependent Hamiltonian H(t) of the working substance, with overall controllable driving H(t) = g(t) H, we study the deviation of the efficiency 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.

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