Magnon-mediated quantum battery under systematic errors

TL;DR

This paper introduces a magnon-mediated quantum battery charging protocol using many-spin systems, demonstrating enhanced performance at optimal coupling strengths and robustness against systematic errors in magnon frequency.

Contribution

It proposes a novel long-range quantum charging method via magnon modes, highlighting the beneficial role of spin-spin interactions and identifying optimal coupling conditions.

Findings

Charging performance is improved by spin-spin couplings.

A 'sweet' spot exists for average coupling strength for optimal charging.

The protocol shows robustness against systematic errors in magnon frequency.

Abstract

Quantum battery is one of the most prominent micro-devices in the rapid-developing quantum thermodynamics. We propose a quantum charging protocol in which both battery and charger are consisted of a many-spin system. The battery and charger are connected via the Kittle mode of the magnon system, that serves as a charging wire and then enables a long-range charging protocol. Counter-intuitively, we find that the spin-spin couplings insider both battery and charger can be used to promote the charging performance in comparison to the noninteracting condition. And a remarkable promotion is realized at a "sweet" spot in terms of the average coupling strength. Moreover, we apply the quantum-state-diffusion equation to test the robustness of our magnon-mediated charging protocol to the systematic errors about the magnon frequency.