Enhanced charging power in nonreciprocal quantum battery by reservoir engineering

TL;DR

This paper introduces a nonreciprocal quantum battery scheme using reservoir engineering in non-Hermitian systems, enabling enhanced charging power, directional energy transfer, and improved resilience at exceptional points.

Contribution

It presents a novel nonreciprocal quantum battery design leveraging reservoir engineering and non-Hermitian physics to improve charging efficiency and robustness.

Findings

Achieved a fourfold energy ratio between battery and charger under resonant conditions.

Enhanced short-time charging power through damping optimization.

Greater resilience of the battery at the exceptional point compared to fully nonreciprocal schemes.

Abstract

We propose a scheme to achieve a nonreciprocal quantum battery (QB) in the non-Hermitian (NH) system, which can overcome the intrinsic dissipation and reverse flow constraints. The design is based on a charger and a battery, which are coherently coupled and jointly interact with a bad cavity. By introducing the auxiliary bad cavity and exploiting the nonreciprocal condition, this model can harness the environmental dissipation to suppress the reverse energy transfer. Under resonant conditions, we have achieved a four ratio of the battery energy to the charger energy; in contrast, this ratio is significantly reduced under large detuning. Through damping optimization, high efficiency of the short-time charging power is attained. In comparison to the fully nonreciprocal scheme, the QB operating at the exceptional point (EP) exhibits greater resilience to parameter fluctuations. These findings highlight the potential of NH quantum engineering for advancing QB technology, particularly in regimes involving directional energy transfer, controlled dissipation, and entropy management in open quantum systems.