Issue |
EPL
Volume 118, Number 4, May 2017
|
|
---|---|---|
Article Number | 40005 | |
Number of page(s) | 7 | |
Section | General | |
DOI | https://doi.org/10.1209/0295-5075/118/40005 | |
Published online | 26 July 2017 |
Energy efficient quantum machines
Department of Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg - D-91058 Erlangen, Germany
(a) Present address: Queen's University Belfast - Belfast, UK;; abahobinna@gmail.com
Received: 14 June 2017
Accepted: 12 July 2017
We investigate the performance of a quantum thermal machine operating in finite time based on shortcut-to-adiabaticity techniques. We compute efficiency and power for a paradigmatic harmonic quantum Otto engine by taking the energetic cost of the shortcut driving explicitly into account. We demonstrate that shortcut-to-adiabaticity machines outperform conventional ones for fast cycles. We further derive generic upper bounds on both quantities, valid for any heat engine cycle, using the notion of quantum speed limit for driven systems. We establish that these quantum bounds are tighter than those stemming from the second law of thermodynamics.
PACS: 05.30.-d – Quantum statistical mechanics / 03.65.-w – Quantum mechanics
© EPLA, 2017
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