Lossy Micromaser Battery: Almost Pure States in the Jaynes-Cummings Regime

TL;DR

This paper investigates a micromaser quantum battery model where a cavity's electromagnetic mode is charged via repeated qubit interactions, demonstrating that coherent protocols produce near-pure steady states and are robust against moderate losses.

Contribution

It introduces a micromaser-based quantum battery model with coherent charging protocols that achieve near-pure steady states, and analyzes robustness against cavity losses.

Findings

Coherent protocols outperform incoherent ones in achieving pure steady states.

Battery performance remains effective under moderate cavity dissipation.

Micromasers are promising candidates for experimental quantum batteries.

Abstract

We consider a micromaser model of a quantum battery, where the battery is a single mode of the electromagnetic field in a cavity, charged via repeated interactions with a stream of qubits, all prepared in the same non-equilibrium state, either incoherent or coherent, with the matter-field interaction modeled by the Jaynes-Cummings model. We show that the coherent protocol is superior to the incoherent one, in that an effective pure steady state is achieved for generic values of the model parameters. Finally, we supplement the above collision model with cavity losses, described by a Lindblad master equation. We show that battery performances, in terms of stored energy, charging power, and steady-state purity, are slightly degraded up to moderated dissipation rate. Our results show that micromasers are robust and reliable quantum batteries, thus making them a promising model for experimental implementations.