Unified trade-off optimization of a three-level quantum refrigerator
arXiv:2008.10258 · doi:10.1016/j.physa.2021.125892
Abstract
We study the optimal performance of a three-level quantum refrigerator using a trade-off objective function, function, which represents a compromise between the energy benefits and the energy losses of a thermal device. First, we optimize the performance of our refrigerator by employing a two-parameter optimization scheme and show that the first two-terms in the series expansion of the obtained coefficient of performance (COP) match with those of some classical models of refrigerator. Then, in the high-temperature limit, optimizing with respect to one parameter while constraining the other one, we obtain the lower and upper bounds on the COP for both strong as well as weak (intermediate) matter-field coupling conditions. In the strong matter-field coupling regime, the obtained bounds on the COP exactly match with the bounds already known for some models of classical refrigerators. Further for weak matter-field coupling, we derive some new bounds on the the COP of the refrigerator which lie beyond the range covered by bounds obtained for strong matter-field coupling. Finally, in the parameter regime where both cooling power and function can be maximized, we compare the cooling power of the quantum refrigerator at maximum function with the maximum cooling power.
arXiv comment9 pages, 4 figures
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