论文标题
通过线性反馈控制为量子电池充电
Charging a quantum battery with linear feedback control
论文作者
论文摘要
储能是一个基本的物理过程，具有许多应用程序。在以量子标准考虑此任务时，重要的是优化能量传输到存储设备或电池的非平衡动力学。在这里，我们使用量子反馈控制方法解决了这个问题。具体而言，我们通过辅助充电器研究能量沉积到量子电池中。后者是经过同源性测量的驱动驱动性两级系统，其输出信号被线性地反馈到驱动场振幅中。我们探讨了两种不同的控制策略，旨在稳定充电器状态下的人群或量子相干。在这两种情况下，线性反馈都显示出可以抵消环境噪声的随机影响，并允许稳定有效的电池充电。我们分析了现实的控制不确定性的效果，表明这种良好的表现可以生存效率低下的测量和小反馈延迟。我们的结果突出了连续反馈控制量子状态中能量量的潜力。
Energy storage is a basic physical process with many applications. When considering this task at the quantum scale, it becomes important to optimise the non-equilibrium dynamics of energy transfer to the storage device or battery. Here, we tackle this problem using the methods of quantum feedback control. Specifically, we study the deposition of energy into a quantum battery via an auxiliary charger. The latter is a driven-dissipative two-level system subjected to a homodyne measurement whose output signal is fed back linearly into the driving field amplitude. We explore two different control strategies, aiming to stabilise either populations or quantum coherences in the state of the charger. In both cases, linear feedback is shown to counteract the randomising influence of environmental noise and allow for stable and effective battery charging. We analyse the effect of realistic control imprecisions, demonstrating that this good performance survives inefficient measurements and small feedback delays. Our results highlight the potential of continuous feedback for the control of energetic quantities in the quantum regime.
