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arXiv 2310.01475cond-mat.str-elquant-ph
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在开放量子系统中复兴Lieb-Schultz-Mattis定理

Reviving the Lieb-Schultz-Mattis Theorem in Open Quantum Systems

Yi-Neng Zhou, Xingyu Li, Hui Zhai, Chengshu Li, Yingfei Gu

AI总结:

本文提出当开放量子系统与热库耦合导致短程关联时,Lieb-Schultz-Mattis定理可在纠缠哈密顿量中复兴,并通过自旋-1/2与自旋-3/2链耦合的数值例子验证,揭示了UV数据与拓扑约束对开放量子多体系统纠缠的重要作用。

摘要:

在封闭系统中,著名的Lieb-Schultz-Mattis(LSM)定理指出,具有平移和自旋旋转对称性的一维局域相互作用半整数自旋链不可能具有非简并的有能隙基态。然而,当系统与热库相互作用并失去能量守恒时,该定理的适用性会减弱。在这封信中,我们提出,当与热库的耦合使系统呈现短程关联时,LSM定理可以在纠缠哈密顿量中得到复兴。具体而言,我们论证纠缠谱不可能具有一个与其他态之间被能隙隔离开的非简并极小值。我们进一步通过数值例子支持这一结果,其中一个自旋-1/2系统与另一条作为热库的自旋-3/2链相耦合。与主要处理UV–IR对应关系的原始LSM定理相比,我们的发现揭示了UV数据和拓扑约束在塑造开放量子多体系统中的纠缠方面也起着关键作用。

英文摘要:

In closed systems, the celebrated Lieb-Schultz-Mattis (LSM) theorem states that a one-dimensional locally interacting half-integer spin chain with translation and spin rotation symmetry cannot have a non-degenerate gapped ground state. However, the applicability of this theorem is diminished when the system interacts with a bath and loses its energy conservation. In this letter, we propose that the LSM theorem can be revived in the entanglement Hamiltonian when the coupling to bath renders the system short-range correlated. Specifically, we argue that the entanglement spectrum cannot have a non-degenerate minimum, isolated by a gap from other states. We further support the results with numerical examples where a spin-$1/2$ system is coupled to another spin-$3/2$ chain serving as the bath. Compared with the original LSM theorem which primarily addresses UV--IR correspondence, our findings unveil that the UV data and topological constraints also have a pivotal role in shaping the entanglement in open quantum many-body systems.

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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