论文标题
量和强度的幂律增长近量子临界点附近
Power-law growth of time and strength of squeezing near quantum critical point
论文作者
论文摘要
在两个基本模型中，跨量子相变的动力学，即横向场中的单轴扭曲模型和DICKE模型的动力学。接近无序（正常）与有序（超级）相之间的相边界，自旋和光子挤压的强度以及系统保持在高度挤压状态的持续时间，表现出强大的幂律增长，距离量子关键点的距离具有距离。在两个模型中，发现挤压时间的临界指数均为1/2，并且对于挤压强度，在单轴扭曲模型中显示为1/2，而Dicke模型为1，而Dicke模型在极端失调的极限也将变为1/2。
The dynamics of squeezing across quantum phase transition in two basic models, viz., the one-axis twisting model in transverse field and the Dicke model, is investigated using Holstein-Primakoff representation in the large spin limit. Near the phase boundary between the disordered (normal) and the ordered (superradiant) phase, the strength of spin and photon squeezing and the duration of time for which the system stays in the highly squeezed state are found to exhibit strong power-law growth with distance from the quantum critical point. The critical exponent for squeezing time is found to be 1/2 in both the models, and for squeezing strength, it is shown to be 1/2 in the one-axis twisting model, and 1 for the Dicke model which in the limit of extreme detuning also becomes 1/2.
