arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2005.12502quant-ph
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纠缠熵的线性响应理论

Linear Response Theory of Entanglement Entropy

Yuan-Sheng Wang, Teng Ma, Man-Hong Yung

摘要:

线性响应理论(LRT)是研究量子物质的重要工具,对于受弱探针扰动的量子系统,它将实验观测的动力学与未探测的平衡态的关联函数联系起来。纠缠熵(Entanglement entropy,EE)是量子纠缠的度量,是量子物理和量子信息科学中一个非常重要的量。虽然EE不是一个可观察的,但开发它的LRT是一件有趣的事情。在这项工作中,我们发展了开放量子系统的冯诺伊曼熵的LRT。此外,我们发现冯诺依曼纠缠熵的线性响应是由一个可观测量的线性响应决定的。使用这个观察,我们定义的久保公式和磁化率EE,它具有相同的属性,其传统的对应。通过利用纠缠电子的LRT,我们进一步发现,对于最大纠缠态或可分态,纠缠电子的线性响应为零,这是纠缠动力学的一个独特特征。最后用XX自旋链模型对我们的解析推导进行了数值验证。电子工程的LRT为研究和理解电子工程提供了一个有用的工具。

英文摘要:

Linear response theory (LRT) is a key tool in investigating the quantum matter, for quantum systems perturbed by a weak probe, it connects the dynamics of experimental observable with the correlation function of unprobed equilibrium states. Entanglement entropy(EE) is a measure of quantum entanglement, it is a very important quantity of quantum physics and quantum information science. While EE is not an observable, developing the LRT of it is an interesting thing. In this work, we develop the LRT of von Neumann entropy for an open quantum system. Moreover, we found that the linear response of von Neumann entanglement entropy is determined by the linear response of an observable. Using this observable, we define the Kubo formula and susceptibility of EE, which have the same properties of its conventional counterpart. Through using the LRT of EE, we further found that the linear response of EE will be zero for maximally entangled or separable states, this is a unique feature of entanglement dynamics. A numerical verification of our analytical derivation is also given using XX spin chain model. The LRT of EE provides a useful tool in investigating and understanding EE.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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