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arXiv 2407.21793cond-mat.stat-mechnlin.CGnlin.SIquant-ph
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对称性分辨纠缠与纠缠不对称性的非平衡动力学:Rule 54中的精确渐近行为

Non-equilibrium dynamics of symmetry-resolved entanglement and entanglement asymmetry: Exact asymptotics in Rule 54

Katja Klobas

AI总结:

本文研究了Rule 54元胞自动机中对称性分辨纠缠与纠缠不对称性的非平衡动力学,通过张量网络与局部代数关系求得荷矩的渐近形式,并发现其在大有限时间区间内呈指数衰减,衰减速率由三次方程的主解确定。

摘要:

对称性分辨纠缠与纠缠不对称性是两种对系统对称性敏感的量子关联度量。本文探讨了它们在Rule 54元胞自动机(一种简单但具有相互作用的可积模型)中的非平衡动力学。这两个量均可通过复制技巧,用更易解析处理的“荷矩”(即适当形变密度矩阵的幂的迹)来表示。我们将其表示为张量网络,并利用局部代数关系系统在空间上进行收缩。这给出了荷矩的渐近形式,适用于大但有限时间且短于所有相关子系统尺寸的区间。在此区间内,荷矩呈指数衰减,衰减速率由三次方程的主解给出。

英文摘要:

Symmetry resolved entanglement and entanglement asymmetry are two measures of quantum correlations sensitive to symmetries of the system. Here we discuss their non-equilibrium dynamics in the Rule 54 cellular automaton, a simple, yet interacting, integrable model. Both quantities can be expressed in terms of the more analytically tractable "charged moments", i.e. traces of powers of a suitably deformed density matrix, via a replica trick. We express them in terms of a tensor network, which we contract in space using a system of local algebraic relations. This gives the asymptotic form for the charged moments, valid in the regime of large but finite time that is shorter than all the relevant subsystem sizes. In this regime the charge moments decay exponentially with the rate given by the leading solution to a cubic equation.

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