论文标题
非线性量子兔模型中的临界量子计量学
Critical Quantum Metrology in the Non-Linear Quantum Rabi Model
论文作者
论文摘要
在光模式和Qubit之间具有线性耦合的量子狂犬模型（QRM）表现出对消失模式频率的二阶相变的类似物，从而允许在几个体系系统中具有临界性增强的量子计量学。我们表明，包括非线性耦合项在内的QRM由于其第一阶而表现出更高的测量精度，例如\ emph {有限}频率的相变，避免了靠近线性QRM临界点的有害减速效果。当将偏置术语添加到哈密顿量时，如果在电路QED平台中实现，系统可以用作通量表或磁力计。
The quantum Rabi model (QRM) with linear coupling between light mode and qubit exhibits the analog of a second order phase transition for vanishing mode frequency which allows for criticality-enhanced quantum metrology in a few-body system. We show that the QRM including a non-linear coupling term exhibits much higher measurement precisions due to its first order like phase transition at \emph{finite} frequency, avoiding the detrimental slowing-down effect close to the critical point of the linear QRM. When a bias term is added to the Hamiltonian, the system can be used as a fluxmeter or magnetometer if implemented in circuit QED platforms.
