Article (Scientific journals)
Maximum power and corresponding efficiency for two-level heat engines and refrigerators: optimality of fast cycles
Erdman, Paolo Andrea; CAVINA, Vasco; Fazio, Rosario et al.
2019In New Journal of Physics
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Abstract :
[en] We study how to achieve the ultimate power in the simplest, yet non-trivial, model of a thermal machine, namely a two-level quantum system coupled to two thermal baths. Without making any prior assumption on the protocol, via optimal control we show that, regardless of the microscopic details and of the operating mode of the thermal machine, the maximum power is universally achieved by a fast Otto-cycle like structure in which the controls are rapidly switched between two extremal values. A closed formula for the maximum power is derived, and finite-speed effects are discussed. We also analyze the associated efficiency at maximum power showing that, contrary to universal results derived in the slow-driving regime, it can approach Carnot's efficiency, no other universal bounds being allowed.
Disciplines :
Physics
Author, co-author :
Erdman, Paolo Andrea
CAVINA, Vasco ;  University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS)
Fazio, Rosario
Taddei, Fabio
Giovannetti, Vittorio
External co-authors :
yes
Language :
English
Title :
Maximum power and corresponding efficiency for two-level heat engines and refrigerators: optimality of fast cycles
Publication date :
2019
Journal title :
New Journal of Physics
ISSN :
1367-2630
Publisher :
Institute of Physics Publishing, Bristol, United Kingdom
Peer reviewed :
Peer Reviewed verified by ORBi
Focus Area :
Physics and Materials Science
Available on ORBilu :
since 29 January 2021

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