Giant-Atom Quantum Batteries

TL;DR

This paper introduces a quantum battery protocol using giant atoms with braided coupling to suppress decoherence, enabling more durable quantum energy storage and unidirectional energy transfer.

Contribution

It proposes a novel braided giant atom architecture that achieves decoherence immunity and introduces a long-range chiral charging scheme for quantum batteries.

Findings

Braided giant atom configuration suppresses decoherence effects.

Long-range chiral charging enables unidirectional energy transfer.

Braided architecture outperforms separated and nested configurations.

Abstract

Environmentally induced decoherence poses a fundamental challenge to quantum energy storage systems, causing irreversible energy dissipation and performance aging of quantum batteries (QBs). To address this issue, we propose a QB protocol utilizing the nonlocal coupling properties of giant atoms (GAs). In this architecture, both the QB and its charger are implemented as superconducting GAs with multiple nonlocal coupling points to a shared microwave waveguide. By engineering these atoms in a braided configuration, where their coupling paths are spatially interleaved, we show the emergence of decoherence-immune interaction dynamics. This unique geometry enables destructive interference between decoherence channels while preserving coherent energy transfer between the charger and the QB, thereby effectively suppressing the aging effects induced by waveguide-mediated dissipation. The charging properties of separated and nested coupled configurations are investigated. The results show that these two configurations underperform the braided configuration. Additionally, we propose a long-range chiral charging scheme that facilitates unidirectional energy transfer between the charger and the battery, with the capability to reverse the flow direction by modulating the applied magnetic flux. Our result provides guidelines for implementing a decoherence-resistant charging protocol and remote chiral QBs in circuits with GAs engineering.