The quantum battery is one of the most prominent microdevices in the rapid-developing field of quantum thermodynamics. We propose a long-range charging protocol in which both battery and charger consist of a many-spin system. The battery and charger are indirectly connected via a quantum wire supported by the Kittle mode of a magnon system. Counterintuitively, we find that the undesired spin-spin couplings among both battery and charger can be used to promote the charging performance in comparison with the noninteracting condition. And a “sweet” spot of the average coupling strength allows the battery to store energy to the maximum possible value. Moreover, we apply the quantum-state-diffusion equation to estimate the robustness of our magnon-mediated charging protocol to the fluctuation in the magnon frequency.

中文翻译：

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系统误差下的磁子介导量子电池

量子电池是快速发展的量子热力学领域最突出的微型器件之一。我们提出了一种长距离充电协议，其中电池和充电器均由多次旋转系统组成。电池和充电器通过磁振子系统的基特尔模式支持的量子线间接连接。与直觉相反，我们发现与非相互作用条件相比，电池和充电器之间不需要的自旋-自旋耦合可用于提高充电性能。平均耦合强度的“最佳”点允许电池将能量存储到最大可能值。此外，我们应用量子态扩散方程来估计我们的磁振子介导充电协议对磁振子频率波动的鲁棒性。