论文标题
与量子自旋链中的淬灭动力学扩增量子相关性：稳态与地面状态
Amplifying quantum correlations with quench dynamics in a quantum spin chain: Steady-states versus ground-states
论文作者
论文摘要
我们根据零温度的淬灭动力学，分析自旋1/2横向场XY链中稳态量子相关性（QC）的行为。我们表明，稳态QC比其地面中的平衡质量值大得多，在该平衡状态下，从铁将单个淬灭从铁磁相进行。放大QCS的另一个框架是一个可行的协议，称为双淬灭动力学。为了实现此目的，我们探测了一个中间淬火点和花费时间t（定义为从中间淬火点传递的时间，然后才达到第二次淬火）。通过这样做，单淬灭和双淬灭都是在最终淬火点中控制稳态QC的实用工具。特别是，并且与对其他一些数量的期望并行，我们指出，稳态QC中的非分析性也可以识别出非平衡量子相变。我们的工作可能可以通过当前的被困离子或超电原子实验的类别进行测试，并鼓励量子信息领域的潜力。
We analyze the behavior of steady-state quantum correlations (QCs) in the spin-1/2 transverse field XY chains analytically, in terms of quench dynamics at zero-temperature. We show that steady-state QCs are strikingly greater than the equilibrium ones in its ground-state, where a single quench is performed from ferro- into para-magnetic phases. Another framework to amplify the QCs here is a feasible protocol called double quench dynamics. To fulfill this purpose, we probe a middle quench point and spending time T (defined as the time passing from the middle quench point before reaching a second quench). By doing so, both single and double quenches act as practical tools to control the enhancement of the steady-state QCs in the final quenched point. In particular, and in parallel to expectations for some other quantities, we indicate that the nonequilibrium quantum phase transitions also can be identified by nonanalyticities in the steady-state QCs. Our work may be testable with the current class of trapped-ion or ultracold-atom experiments, and encourage the possible potential in the quantum information field.
