Isoenergetic cycle for the quantum Rabi model

TL;DR

This paper investigates the efficiency and work output of the isoenergetic cycle within the quantum Rabi model, demonstrating conditions for maximal efficiency and improvements over previous systems by controlling specific parameters.

Contribution

It extends the study of the isoenergetic cycle to the quantum Rabi model, analyzing how controlling coupling and frequency parameters enhances efficiency and work extraction.

Findings

Maximal efficiency achieved at high parameter values.

High efficiency correlates with maximal work extraction.

Improvements over previous proposals in cycle performance.

Abstract

The isoenergetic cycle is a purely mechanical cycle comprised of adabatic and isoenergetic processes. In the latter the system interacts with an energy bath keeping constant the expectation value of the Hamiltonian. This cycle has been mostly studied in systems consisting of particles confined in a power-law trap. In this work we study the performance of the isoenergetic cycle for a system described by the quantum Rabi model for the case of controlling the coupling strength parameter, the resonator frequency and the two-level system frequency. For the cases of controlling either the coupling strength parameter or the resonator frequency, we find that it is possible to reach maximal unit efficiency when the parameter is sufficiently increased in the first adiabatic stage. In addition, for the first two cases the maximal work extracted is obtained at parameter values corresponding to high efficiency which constitutes an improvement over current proposals of this cycle.