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Entropy 2016, 18(4), 141;

Testing a Quantum Heat Pump with a Two-Level Spin

Unitat de Física Teòrica, Informació i Fenòmens Quàntics, Departament de Física, Universitat Autònoma de Barcelona, Barcelona 08193, Spain
School of Mathematical Sciences, The University of Nottingham, Nottingham NG9 2RD, UK
Author to whom correspondence should be addressed.
Academic Editors: Ronnie Kosloff and Jay Lawrence
Received: 9 February 2016 / Revised: 24 March 2016 / Accepted: 8 April 2016 / Published: 15 April 2016
(This article belongs to the Special Issue Quantum Thermodynamics)
Full-Text   |   PDF [411 KB, uploaded 15 April 2016]   |  


Once in its non-equilibrium steady state, a nanoscale system coupled to several heat baths may be thought of as a “quantum heat pump”. Depending on the direction of its stationary heat flows, it may function as, e.g., a refrigerator or a heat transformer. These continuous heat devices can be arbitrarily complex multipartite systems, and yet, their working principle is always the same: they are made up of several elementary three-level stages operating in parallel. As a result, it is possible to devise external “black-box” testing strategies to learn about their functionality and performance regardless of any internal details. In particular, one such heat pump can be tested by coupling a two-level spin to one of its “contact transitions”. The steady state of this external probe contains information about the presence of heat leaks and internal dissipation in the device and, also, about the direction of its steady-state heat currents. Provided that the irreversibility of the heat pump is low, one can further estimate its coefficient of performance. These techniques may find applications in the emerging field of quantum thermal engineering, as they facilitate the diagnosis and design optimization of complex thermodynamic cycles. View Full-Text
Keywords: thermodynamics; open quantum systems; thermal engineering thermodynamics; open quantum systems; thermal engineering

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Correa, L.A.; Mehboudi, M. Testing a Quantum Heat Pump with a Two-Level Spin. Entropy 2016, 18, 141.

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