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Perturbative analysis of topological entanglement entropy from conditional independence

机译:基于条件独立性的拓扑纠缠熵的扰动分析

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We use the structure of conditionally independent states to analyze the stability of topological entanglement entropy. For the ground state of the quantum double or Levin-Wen model, we obtain a bound on the first-order perturbation of topological entanglement entropy in terms of its energy gap and subsystem size. The bound decreases superpolynomially with the size of the subsystem, provided the energy gap is nonzero. We also study the finite-temperature stability of stabilizer models, for which we prove a stronger statement than the strong subadditivity of entropy. Using this statement and assuming (i) finite correlation length and (ii) small conditional mutual information of certain configurations, first-order perturbation effect for arbitrary local perturbation can be bounded. We discuss the technical obstacles in generalizing these results.
机译:我们使用条件独立状态的结构来分析拓扑纠缠熵的稳定性。对于量子双模或Levin-Wen模型的基态,我们从拓扑纠缠熵的能级和子系统大小的一阶扰动中得到一个界。如果能隙不为零,则边界随子系统的大小呈多项式减小。我们还研究了稳定器模型的有限温度稳定性,为此我们证明了比熵的强次加和性更强的陈述。使用该陈述并假设(i)有限的相关长度和(ii)某些配置的小条件互信息,可以限制任意局部扰动的一阶扰动效应。我们讨论了推广这些结果的技术障碍。

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