Nonequilibrium quantum absorption refrigerator

Abstract

We study a quantum absorption refrigerator, in which a target qubit is cooled by two machine qubits in a nonequilibrium steady state. It is realized by a strong internal coupling in the two-qubit fridge and a vanishing tripartite interaction among the whole system. The coherence of a \emph{machine virtual qubit} is investigated as quantumness of the fridge. A necessary condition for cooling shows that the quantum coherence is beneficial to the nonequilibrium fridge, while it is detrimental as far as the maximum coefficient of performance (COP) and the COP at maximum power are concerned. Here, the COP is defined only in terms of heat currents caused by the tripartite interaction, with the one maintaining the two-qubit nonequilibrium state being excluded. The later can be considered to have no direct involvement in extracting heat from the target, as it is not affected by the tripartite interaction.

8 pages, 6 figures. Published version

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• Roles of quantum coherences in thermal machines
• Supremacy of incoherent sudden cycles
• Classical emulation of quantum-coherent thermal machines
• Cooling condition for multilevel quantum absorption refrigerators
• Key Issues Review: Useful autonomous quantum machines
• Designing Robust Quantum Refrigerators in Disordered Spin Models
• Sudden death of entanglement induced by a minimal thermal environment
• Fluctuations and stability of a fast driven Otto cycle
• Three qubits in less than three baths: Beyond two-body system-bath interactions in quantum refrigerators
• Quantum refrigeration powered by noise in a superconducting circuit
• Anomalous Heat Transfer in Nonequilibrium Quantum Systems
• Dynamical phase and quantum heat at fractional frequencies
• Quantum refrigerator embedded in spin-star environments: Scalings of temperature and refrigeration time