Boosting the Performance of a Lipkin-Meshkov-Glick Quantum Battery via Symmetry-Breaking Quenches and Bosonic Baths

TL;DR

This paper investigates how symmetry-breaking quenches and bosonic baths influence the energy storage and retrieval efficiency of Lipkin-Meshkov-Glick quantum batteries, revealing optimal conditions for enhanced performance.

Contribution

It demonstrates that magnetic field quenches and environmental coupling can significantly improve quantum battery performance, highlighting new strategies for quantum energy storage optimization.

Findings

Energy storage is enhanced by quenching from symmetric to broken phase.

Weak coupling to bosonic baths improves charging efficiency.

Strong coupling saturates stored work and ergotropy.

Abstract

We explore the operation of quantum batteries in the Lipkin-Meshkov-Glick (LMG) model, when they are charged either through a sudden quench in the magnetic field strength or by coupling them to a bosonic oscillator bath. Through initializing the battery in either the symmetric or broken symmetry phases of the LMG model we analyze how the different spectral properties can affect the performance of both the charging and discharging of the battery. In particular, we show that by quenching the magnetic field strength from the symmetric phase to the broken phase, we can achieve a significant enhancement in stored energy, as well as stable and efficient ergotropy extraction. Similar observations can be made when introducing weak coupling between the battery with the bosonic bath, while the amount of stored work and ergotropy saturate at strong coupling. These findings emphasize the importance of the magnetic field dynamics and environmental coupling in optimizing charging performance, which could lead to practical applications in quantum energy storage.