Bulletin of the American Physical Society
APS March Meeting 2020
Volume 65, Number 1
Monday–Friday, March 2–6, 2020; Denver, Colorado
Session D09: Quantum Thermodynamics
2:30 PM–5:30 PM,
Monday, March 2, 2020
Room: 106
Sponsoring
Unit:
DQI
Chair: Ruichao Ma, Purdue University
Abstract: D09.00007 : Collective phenomena in quantum thermodynamics: from mitigation to amplification of the baths' action*
Presenter:
Francesco Petruccione
(Univ of KwaZulu-Natal)
Authors:
Camille Lombard Latune
(Univ of KwaZulu-Natal)
Ilya Sinayskiy
(Univ of KwaZulu-Natal)
Francesco Petruccione
(Univ of KwaZulu-Natal)
We reach the conclusion [1] that collective coupling, through the coherences it intrinsically generates, effectively shield the ensemble from the bath's action, affecting dramatically the thermodynamic characteristic of the ensemble (energy, entropy, and free energy). Strikingly, in presence of two thermal baths, the combination of these mitigation effects can result in a great amplification of the baths' action. This is illustrated through a cyclic (Otto) thermal machine, resulting in a large output power enhancement. We also highlight that such enhancements are not systematic: depending on the value of the bath temperatures, the number of spins, and their dimension, either enhancement or degradation of performances can happen.
[1] C. L. Latune, I. Sinayskiy, and F. Petruccione, arXiv:1908.10384
*South African Research Chair Initiative, National Research Foundation and NITheP.
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