Loss-induced nonreciprocal quantum battery

TL;DR

This paper introduces a nonreciprocal quantum battery model where engineered cavity loss induces directional energy flow, significantly improving charging efficiency over reciprocal systems.

Contribution

It demonstrates how loss engineering in a cavity system can create nonreciprocal energy transfer, enhancing quantum battery performance.

Findings

Steady-state energy in the battery exceeds that in the charger.

Nonreciprocal system shows a significant charging advantage.

Loss engineering enables directional energy flow in quantum batteries.

Abstract

Nonreciprocal quantum batteries offer superior charging performance compared to reciprocal quantum batteries. We consider a charger-battery system comprising two optical cavities that interact independently with a third auxiliary cavity. We show that the nonzero dissipation of the auxiliary cavity induces a nonreciprocal exchange of excitations among the charger-battery system. Therefore, by engineering the loss in the auxiliary cavity, we induce a directional energy flow that enhances the charging efficiency. Using numerical and analytical calculations, we show that the steady-state energy stored in the battery significantly exceeds that in the charger. We compare our results with those of the reciprocal cases and demonstrate that our nonreciprocal quantum battery model exhibits a significant charging advantage. We believe that our proposed scheme represents a step forward in cavity-loss engineering, making it a viable approach for nonreciprocal quantum batteries with existing experimental techniques.