Chiral quantum batteries

TL;DR

This paper introduces a chiral magnonic quantum battery that leverages nonreciprocal energy flow and quantum coherence to significantly enhance energy capacity and work extraction, overcoming decoherence challenges.

Contribution

It proposes a novel chiral magnonic quantum battery architecture that exploits chirality to improve energy storage and robustness, a significant advancement over previous designs.

Findings

34-fold increase in energy capacity

55-fold boost in extractable work

Enhanced robustness and remote charging capabilities

Abstract

Exploiting quantum effects for energy storage, quantum batteries (QBs) offer compelling advantages over conventional ones in terms of superior energy density, ultrafast charging, and high conversion efficiency. However, their realization is hampered by decoherence, which causes incomplete charging, rapid self-discharging, and reduced extractable work. Here, we propose a QB architecture based on a chiral magnonic platform. It comprises two yttrium iron garnet (YIG) spheres, one serving as the charger and the other as the QB, coupled to a waveguide. The unique chiral coupling between magnons and the guided electromagnetic fields breaks inversion symmetry, inducing both nonreciprocal energy flow and coherent interference between the charger and QB. Their synergy endows our QB with a 34-fold increase in energy capacity and a 55-fold boost in extractable work compared to its achiral counterpart in an experimentally accessible regime. Our scheme harnesses the decoherence from the electromagnetic fields and turns its destruction into an asset, which enables the robustness and wireless-like remote charging features of the QB. Our analysis reveals that these extraordinary capabilities stem from quantum coherence. By establishing chirality as a useful quantum resource, our work paves a viable path toward the realization of QBs.