Cooling with fermionic reservoir

TL;DR

This paper compares fermionic and bosonic quantum reservoirs in thermal refrigerators, demonstrating that fermionic reservoirs offer advantages, and analyzes the underlying reasons related to state behavior and exchange rates.

Contribution

It provides a comparative analysis showing fermionic reservoirs outperform bosonic ones in quantum refrigeration, with insights into the mechanisms behind these advantages.

Findings

Fermionic reservoirs have advantages over bosonic reservoirs in heat machine operation.

The study explains these advantages through asymptotic state behavior and exchange rate analysis.

Fermionic reservoirs can improve the efficiency of quantum refrigerators.

Abstract

Recently, much emphasis has been given to genuinely quantum reservoirs generically called fermionic reservoirs. These reservoirs are characterized by having finite levels, as opposed to bosonic reservoirs, which have infinite levels that can be populated via an increase in temperature. Given this, some studies are being carried out to explore the advantages of using quantum reservoirs, in particular in the operation of heat machines. In this work, we make a comparative study of a thermal refrigerator operating in the presence of either a bosonic or a fermionic reservoir, and we show that fermionic reservoirs have advantages over bosonic ones. We propose an explanation for the origin of these advantages by analyzing both the asymptotic behavior of the states of the qubits and the exchange rates between these qubits and their respective reservoirs.