Enhancement of an Unruh-DeWitt battery performance through quadratic environmental coupling

TL;DR

This paper explores how quadratic environmental coupling can improve the performance and stability of an Unruh-DeWitt quantum battery under relativistic motion, showing enhanced coherence and efficiency.

Contribution

It derives the Lindblad equation for quadratic coupling and demonstrates that nonlinear environmental interactions significantly boost quantum battery performance.

Findings

Quadratic coupling enhances coherence and stability.

Orthogonal velocity mitigates decoherence effects.

Battery capacity and efficiency are significantly improved.

Abstract

We investigate relativistic effects on the performance of a quantum battery in an open quantum framework. We consider an Unruh-DeWitt detector driven by a coherent classical pulse as a quantum battery that is interacting with a massless scalar field through a quadratic coupling. The battery follows a trajectory composed of uniform acceleration along one direction, combined with constant four-velocity components in the orthogonal plane to the acceleration. Accelerated motion degrades the performance of the quantum battery rapidly in the absence of the orthogonal velocity component. We first derive the Lindblad equation for quadratic coupling in detail. We then show that the quadratic scalar field coupling enhances coherence and stability in the presence of orthogonal velocity. We observe that decoherence is mitigated significantly, resulting in remarkable improvement in the battery capacity and efficiency compared to the case of the usual linear field coupling. This opens up the possibility of nonlinear environmental coupling enabling stored energy to be retained over longer durations, leading to more efficient operation of quantum devices.