Multilevel quantum thermodynamic swap engines
Abstract
We study energetic exchanges and fluctuations in twostroke quantum thermodynamic engines where the working fluid is represented by two multilevel quantum systems, i.e., qudits, the heat flow is allowed by relaxation with two thermal reservoirs at different temperatures, and the work exchange is operated by a partialswap unitary interaction. We identify three regimes of operation (heat engine, refrigerator, and thermal accelerator), present the thermodynamic uncertainty relations between the entropy production and the signaltonoise ratio of work and heat, and derive the full joint probability of the stochastic work and heat. Our results bridge the gap between twoqubit and twomode bosonic swap engines, and show which properties are maintained (e.g., a nonfluctuating Otto efficiency) and which are lost for increasing dimension (e.g., small violations of the standard thermodynamic uncertainty relations or the possibility of beating the CurzonAhlborn efficiency).
 Publication:

Physical Review A
 Pub Date:
 July 2021
 DOI:
 10.1103/PhysRevA.104.012217
 arXiv:
 arXiv:2106.15897
 Bibcode:
 2021PhRvA.104a2217S
 Keywords:

 Quantum Physics;
 Condensed Matter  Statistical Mechanics
 EPrint:
 14 pages, 8 figures