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Dynamics of coherence: Maximal quantum Fisher information versus Loschmidt echo

机译:相干动态:最大量子Fisher信息与Loschmidt Echo

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We consider the dynamics of maximal quantum Fisher information (MQFI) alter sudden quenches for the one-dimensional transverse-field Ising model. Our results show, the same as Loschmidt echo, that there is a universality for the revival times, i.e., they do not depend on the initial state and the size of the quench and are given by integer multiples of T_(rev) approx= N/2v_(max) , where N is the system size and v_(max) is the maximal group velocity of quasiparticles. Critically enhanced and decreased at revival and decay times as T_(rev) ≡ T_(dec) are characterized by quenching from the order and disorder phases into the quantum phase transition, respectively, that can be utilized to detect the quantum critical point (QCP). In some quenches crossed from the QCP, nonanalytic behaviors appear at some times due to the turning of the local observable from one direction to another because of identifying the maximum value. We name this phenomenon the dynamical MQFI transitions, occurring at the critical times t_c. Interestingly, although no Fisher zero exists in the dynamics of MQFI, the first critical time emerged from the dynamical quantum phase transition is equal to the first time when the logarithm of MQFI is minimum. In addition, we unveil the long-time run of MQFI indicates a signature of a nonequilibrium quantum phase transition at the QCP. We also discuss the probability of the arising of macroscopic superpositions in the nonequilibrium dynamics of the system.
机译:我们考虑最大量子Fisher信息(MQFI)的动态改变一维横向场ising模型的突然淬火。我们的结果表明,与Loschmidt Echo相同,即复活时间存在普遍性,即它们不依赖于初始状态和淬火的大小,并通过整数倍数给出T_(Rev)约= n / 2v_(max),其中n是系统大小,v_(max)是Quasiply的最大组速度。在复兴和衰减时间以T_(Rev)≡T_(DEC)的特征在于分别从顺序和紊乱阶段淬火分别在量子相转变中的表征,可以用于检测量子临界点(QCP) 。在从QCP交叉的一些淬火中,由于识别最大值,因此由于局部从一个方向转动到另一个方向的局部观察而出现非分析行为。我们将这种现象命名为动态MQFI转换,在临界时期T_C发生。有趣的是,尽管在MQFi的动态中存在Fisher零,但是在动态量子相变的第一临界时间等于MQFI对数最小的第一次。此外,我们揭示了MQFI的长期运行表示在QCP处的非纤维量子相变的签名。我们还讨论了系统不足动力学中宏观叠加产生的概率。

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  • 来源
    《Physical review》 |2020年第2期|024304.1-024304.9|共9页
  • 作者单位

    Department of Physics University of Guilan 41335-1914 Rasht Iran;

    Department of Physics University of Guilan 41335-1914 Rasht Iran;

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