Optimal qubit-mediated quantum heat transfer via noncommuting operators and strong coupling effects

TL;DR

This paper investigates how to optimize quantum heat transfer mediated by a central qubit, revealing different optimal conditions in weak and strong coupling regimes, with noncommuting operators playing a key role in the latter.

Contribution

It introduces a numerical and analytical study of system-bath coupling operators that maximize heat transfer, highlighting the importance of noncommuting operators in strong coupling regimes.

Findings

Optimal heat transfer in weak coupling requires identical, resonant coupling operators.

In strong coupling, noncommuting operators between reservoirs enhance heat transfer.

Analytical insights reveal limitations of effective Hamiltonian methods for noncommuting interactions.

Abstract

Heat transfer in quantum systems is a current topic of interest due to emerging quantum technologies that attempt to miniaturize engines and examine fundamental aspects of thermodynamics. In this work, we consider heat transfer between two thermal reservoirs in which a central spin degree of freedom mediates the process. Our objective is to identify the system-bath coupling operators that maximize heat transfer at arbitrary system-bath coupling strengths. By employing a Markovian embedding method in the form of the reaction-coordinate mapping, we study numerically heat transfer at arbitrary system-bath coupling energy and for general system-bath coupling operators between the baths and the central qubit system. We find a stark contrast in the conditions required for optimal heat transfer depending on whether the system is weakly or strongly coupled to the heat baths. In the weak-coupling regime, optimal heat transfer requires identical coupling operators that facilitate maximum sequential transport, resonant with the central qubit. In contrast, in the strong-coupling regime, noncommuting system-bath coupling operators between the hot and cold reservoirs are necessary to achieve optimal heat transfer. We further employ the Effective Hamiltonian theory and gain partial analytical insights into the observed phenomena. We discuss the limitations of this approximate method in capturing the behavior of the heat current for noncommuting coupling operators, calling for its future extensions to capture transport properties in systems with general interaction Hamiltonians.