4.7 Article

Strongly coupled quantum Otto cycle with single qubit bath

期刊

PHYSICAL REVIEW E
卷 106, 期 6, 页码 -

出版社

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevE.106.064133

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资金

  1. Polish National Sci- ence Centre
  2. [2018/30/A/ST2/00837]

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We discuss a model of closed quantum evolution of two qubits, where one qubit acts as a bath and thermalizes the other qubit acting as the system. The exact master equation for the system is derived, and interestingly, it takes the Gorini-Kossakowski-Lindblad-Sudarshan (GKLS) form, with constant coefficients representing pumping and damping of a single qubit system. Based on this model, we construct an Otto cycle connected to a single qubit bath and study its thermodynamic properties, including effects of finite baths and non-Markovianity. We find closed form expressions for efficiency, power, and different modifications of the joint Hamiltonian.
We discuss a model of a closed quantum evolution of two qubits where the joint Hamiltonian is so chosen such that one of the qubits acts as a bath and thermalizes the other qubit which is acting as the system. The corresponding exact master equation for the system is derived. Interestingly, for a specific choice of parameters the master equation takes the Gorini-Kossakowski-Lindblad-Sudarshan (GKLS) form, with constant coefficients representing pumping and damping of a single qubit system. Based on this model we construct an Otto cycle connected to a single qubit bath and study its thermodynamic properties. Our analysis goes beyond the conventional weak coupling scenario and illustrates the effects of finite baths, including non-Markovianity. We find closed form expressions for efficiency (coefficient of performance), power (cooling power) for the heat engine regime (refrigerator regime), and for different modifications of the joint Hamiltonian.

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