Hyperbolic enhancement of a quantum battery

TL;DR

This paper proposes a quantum battery model utilizing quantum squeezing that achieves hyperbolic energy enhancement, effectively mitigating dissipation and maximizing extractable work, indicating a promising route for high-performance quantum energy storage.

Contribution

The study introduces a quantum battery model leveraging squeezing to induce hyperbolic energy growth, reducing dissipation effects and aligning stored energy with extractable work.

Findings

Hyperbolic enhancement of stored energy via squeezing.

Dissipation effects become negligible with quadratic charging.

Ergotropy equals stored energy under strong driving.

Abstract

A quantum system which can store energy, and from which one can extract useful work, is known as a quantum battery. Such a device raises interesting issues surrounding how quantum physics can provide certain advantages in the charging, energy storage or discharging of the quantum battery as compared to their classical equivalents. However, the pernicious effect of dissipation degrades the performance of any realistic battery. Here we show how one can circumvent this problem of energy loss by proposing a quantum battery model which benefits from quantum squeezing. Namely, charging the battery quadratically with a short temporal pulse induces a hyperbolic enhancement in the stored energy, such that the dissipation present becomes essentially negligible in comparison. Furthermore, we show that when the driving is strong enough the useful work which can be extracted from the quantum battery, that is the ergotropy, is exactly equal to the stored energy. These impressive properties imply a highly efficient quantum energetic device with abundant amounts of ergotropy. Our theoretical results suggest a possible route to realizing high-performance quantum batteries, which could be realized in a variety of platforms exploiting quantum continuous variables.