用广义洛施密特回波检测量子性
Detecting quantumness with generalized Loschmidt echoes
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中文总结 AI 辅助
该研究提出广义洛施密特回波方法，利用四个正反时间传播子的非对易性检测量子性，在自旋链临界动力学、高斯动力学及高温经典极限中均观测到非经典特征。
中文摘要 AI 辅助
洛施密特回波是一种已被广泛认可的方法，用于表征量子混沌、对扰动的敏感性等动力学性质。本文提出一种简单的广义化方法，可识别非经典动力学行为。广义回波包含四个正反时间传播子，若这些传播子不对易，便能在回波的关联中轻松识别该性质的特征。作为示例，本文分析了自旋链临界动力学中固有非对易量子特征的检测，有趣的是，在通常被视为经典的高斯动力学和高温极限下，也观测到了该现象。
英文摘要
Loschmidt echoes are a well-established method to characterize dynamical properties such as quantum chaos and sensitivity to perturbations. Here we present a straightforward generalization that identifies non-classical dynamical behavior. The generalized echoes involve four forward-backward time propagators. If these propagators do not commute, one can readily identify signatures of this property in the relations between echoes. As an example, detection of intrinsic non-commuting quantum features is analyzed in critical dynamics of a spin chain. Interestingly, this phenomenon is also observed for Gaussian dynamics and high temperature limits which are generally regarded as classical.
