论文标题
量子狂犬模型中的超阶相关器
Out-of-time-order correlator in the quantum Rabi model
论文作者
论文摘要
我们研究了混乱的特征和量子性兔模型中的平衡，当原子水平分解与玻感频率的比率增长到无穷大时，该模型表现出量子相变。我们表明，源自Loschmidt Echo信号的超级相关器在正常相中迅速饱和，并揭示了与量子混乱的发作相关的超级阶段的指数生长。此外，我们表明，与自旋系统大小相比，量子兔系统的有效时间平均尺寸可能很大，这导致了抑制时间波动和自旋系统的平衡。
We investigate signatures of chaos and equilibration in the quantum Rabi model, which exhibits a quantum phase transition when the ratio of the atomic level-splitting to bosonic frequency grows to infinity. We show that out-of-time-order correlator derived from the Loschmidt echo signal quickly saturates in the normal phase and reveals exponential growth in the superradiant phase which is associated with the onset of quantum chaos. Furthermore, we show that the effective time-averaged dimension of the quantum Rabi system can be large compared to the spin system size which leads to suppression of the temporal fluctuations and equilibration of the spin system.
