论文标题
超晶体耦合方案中的光谱和临界量子温度法
Spectroscopy and critical quantum thermometry in the ultrastrong coupling regime
论文作者
论文摘要
我们提出了各向异性Hopfield模型的精确分析解决方案，并使用它详细研究了两个超构造耦合量子系统的光谱和温度响应。有趣的是，我们表明，根据耦合系统的初始状态，真空狂犬分裂表现出明显的不对称性，这些不对称性可能被视为违反直觉解耦效果的光谱特征。使用耦合系统作为用于量子热力学应用的温度计，我们获得了在Ultrastrong耦合方面保持有效的温度估计的最终界限。值得注意的是，如果系统执行量子相变，则量子Fisher信息将表现出周期性差异，这表明对于这种关键的量子传感器，一个人可以具有多个任意高的温度准确度。
We present an exact analytical solution of the anisotropic Hopfield model, and we use it to investigate in detail the spectral and thermometric response of two ultrastrongly coupled quantum systems. Interestingly, we show that depending on the initial state of the coupled system, the vacuum Rabi splitting manifests significant asymmetries that may be considered spectral signatures of the counterintuitive decoupling effect. Using the coupled system as a thermometer for quantum thermodynamics applications, we obtain the ultimate bounds on the estimation of temperature that remain valid in the ultrastrong coupling regime. Remarkably, if the system performs a quantum phase transition, the quantum Fisher information exhibits periodic divergences, suggesting that one can have several points of arbitrarily high thermometric precision for such a critical quantum sensor.
