Micromasers as Quantum Batteries

TL;DR

This paper demonstrates that micromasers can serve as effective quantum batteries, achieving stable, highly excited states through coherent qubit charging, even in the ultrastrong coupling regime, with robustness against decoherence and counter-rotating effects.

Contribution

It introduces micromasers as a novel model for quantum batteries capable of maintaining stable, highly excited states under realistic conditions.

Findings

Achieves stable, highly excited cavity states with coherent qubits

Demonstrates robustness against qubit decoherence

Shows effectiveness even in the ultrastrong coupling regime

Abstract

We show that a micromaser is an excellent model of quantum battery. A highly excited, pure, and effectively steady state of the cavity mode, charged by coherent qubits, can be achieved, also in the ultrastrong coupling regime of field-matter interaction. Stability of these appealing features against loss of coherence of the qubits and the effect of counter-rotating terms in the interaction Hamiltonian are also discussed.