标题： 时间演化相关性的生存取决于淬火是否跨越XY自旋链中的临界点 显示英文标题

标题： Survival of time-evolved correlations depends on whether quenching is across critical point in XY spin chain

摘要： 量子横各向异性XY自旋链在无限长度下的量子关联的时间动力学在零温度和有限温度下被研究。 演化是由于模型中最近邻自旋之间的耦合常数的瞬时淬火引起的，这种淬火是在同一相内进行，或跨越连接模型有序-无序相的量子相变点。 我们表征了时间演化的量子关联、纠缠和量子失谐，它们的行为因初始状态和淬火方案而异。 我们表明，当系统从有序相淬火到深无序相时，系统具有比初始状态更强的双粒子量子关联。 然而，当系统从无序相淬火到有序相且初始状态处于零温度时，双粒子量子关联几乎被消除。 此外，我们确定了当系统在同一相内淬火时增强双粒子关联发生的条件。 最后，我们研究了初始状态为有限温度的热平衡态时的双粒子量子关联，这揭示了热涨落对零温度下观察到现象的影响。 显示英文摘要

摘要： The time-dynamics of quantum correlations in the quantum transverse anisotropic XY spin chain of infinite length is studied at zero as well as finite temperatures. The evolution occurs due to the instantaneous quenching of the coupling constant between the nearest-neighbor spins of the model, which is either performed within the same phase or across the quantum phase transition point connecting the order-disorder phases of the model. We characterize the time-evolved quantum correlations, entanglement and quantum discord, which exhibit varying behavior depending on the initial state and the quenching scheme. We show that the system is endowed with enhanced bipartite quantum correlations compared to that of the initial state, when quenched from ordered to the deep disordered phase. However, bipartite quantum correlations are almost washed out when the system is quenched from disordered to the ordered phase with the initial state being at the zero-temperature. Moreover, we identify the condition for the occurrence of enhanced bipartite correlations when the system is quenched within the same phase. Finally, we investigate the bipartite quantum correlations when the initial state is a thermal equilibrium state with finite temperature which reveals the effects of thermal fluctuation on the phenomena observed at zero-temperature.