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arXiv 1801.01684cond-mat.str-elcond-mat.quant-gas
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用非时序关联函数探测Ising链的平衡态和动力学量子相变

Detecting equilibrium and dynamical quantum phase transitions in Ising chains via out-of-time-ordered correlators

Markus Heyl, Frank Pollmann, Balázs Dóra

摘要:

非时序关联函数已经发展成为量化量子信息传输、信息置乱和量子混沌的核心概念。在这项工作中,我们表明,这种OTO相关器也可以用来动态检测平衡以及非平衡相变伊辛链。本文研究了一维横场伊辛模型的不同变形(包括可积模型、不可积模型和长程扩展模型)在平衡态和量子猝灭后的序参量的OTO关联函数.我们发现对于所有研究的模型,OTO相关器在基态检测到量子相变。从一个完全偏振态的量子猝灭后,我们观察到数值的短程模型的渐近长时间值的OTO相关信号仍然是平衡临界点和有序相。对于长程扩展,OTO相关器代替地确定模型中的动态量子相变。我们讨论了如何在当前的实验中观察到我们的发现被困离子或里德伯原子。

英文摘要:

Out-of-time-ordered (OTO) correlators have developed into a central concept quantifying quantum information transport, information scrambling and quantum chaos. In this work we show that such OTO correlator can also be used to dynamically detect equilibrium as well as nonequilibrium phase transitions in Ising chains. We study OTO correlators of an order parameter both in equilibrium and after a quantum quench for different variants of transverse-field Ising models in one dimension, including the integrable one as well as non-integrable and long-range extensions. We find for all the studied models that the OTO correlator in ground states detects the quantum phase transition. After a quantum quench from a fully polarized state we observe numerically for the short-range models that the asymptotic long-time value of the OTO correlator signals still the equilibrium critical points and ordered phases. For the long-range extension, the OTO correlator instead determines a dynamical quantum phase transition in the model. We discuss how our findings can be observed in current experiments of trapped ions or Rydberg atoms.

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