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Dynamical heat engines with non-Markovian reservoirs
Fabio Cavaliere (Superconducting and other Innovative Materials and Devices Institute, University of Genoa), Matteo Carrega (Superconducting and other Innovative Materials and Devices Institute), G. De Filippis (Istituto Nazionale di Fisica Nucleare, Sezione di Napoli, University of Naples Federico II), V. Cataudella (University of Naples Federico II), Giuliano Benenti (University of Insubria, Istituto Nanoscienze), Maura Sassetti (Superconducting and other Innovative Materials and Devices Institute, University of Genoa)
Résumé : We discuss whether, and under which conditions, it is possible to realize a heat engine simply by dynamically modulating the couplings between the quantum working medium and thermal reservoirs. For that purpose, we consider the paradigmatic model of a quantum harmonic oscillator, exposed to a minimal modulation, that is, a monochromatic driving of the coupling to only one of the thermal baths. We demonstrate, at any order in the system/bath coupling strength, that in this setup non-Markovianity of the bath is a necessary condition to obtain a heat engine. In addition, we identify suitable structured environments for the engine to approach the ideal Carnot efficiency. Our results open up new possibilities for the use of non-Markovian open quantum systems for the construction and optimization of quantum thermal machines.