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arXiv 2302.00689quant-phcond-mat.str-el
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拓扑纠缠熵的普适下界

Universal lower bound on topological entanglement entropy

Isaac H. Kim, Michael Levin, Ting-Chun Lin, Daniel Ranard, Bowen Shi

AI总结:

本文证明二维有能隙基态中的伪拓扑纠缠熵总是非负,从而确立任意子理论预言值为拓扑纠缠熵的普适下界,并给出常数深度电路下不变的 TEE 定义。

摘要:

二维有能隙基态的纠缠熵预期满足面积律,并带有一个称为拓扑纠缠熵(TEE)的常数修正项。在许多模型中,TEE 取一个刻画底层拓扑相的普适值。然而,TEE 并非真正普适:即使对于由常数深度电路联系的两个态(它们必然处于同一相),TEE 也可能不同。TEE 与任意子理论所预言值之间的差通常被称为伪拓扑纠缠熵。我们证明这一伪贡献总是非负的,因此任意子理论所预言的值提供了一个普适下界。这一观察还引出了一个在常数深度量子电路下不变的 TEE 定义。

英文摘要:

Entanglement entropies of two-dimensional gapped ground states are expected to satisfy an area law, with a constant correction term known as the topological entanglement entropy (TEE). In many models, the TEE takes a universal value that characterizes the underlying topological phase. However, the TEE is not truly universal: it can differ even for two states related by constant-depth circuits, which are necessarily in the same phase. The difference between the TEE and the value predicted by the anyon theory is often called the spurious topological entanglement entropy. We show that this spurious contribution is always nonnegative, thus the value predicted by the anyon theory provides a universal lower bound. This observation also leads to a definition of TEE that is invariant under constant-depth quantum circuits.

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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