Symmetry resolved entanglement of excited states in quantum field theory. Part II. Numerics, interacting theories and higher dimensions

Symmetry resolved entanglement of excited states in quantum field theory. Part II. Numerics, interacting theories and higher dimensions
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对称性解决了量子场论中激发态的纠缠。

DOI:
10.1007/jhep12(2022)128
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发表时间:
2022
影响因子:
5.4
通讯作者:
Capizzi L
Capizzi L
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Capizzi L

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在最近的一篇论文中,我们研究了复自由量子场论中零密度激发态的纠缠含量,重点研究了对称分辨纠缠熵。零密度态是指在无限体积系统中,基态之上有固定的、有限数量的激发态。SREE是为具有内部对称性的理论定义的,并提供了对每个对称扇区的总纠缠的贡献的度量。在我们的工作中,我们表明,SREE的傅里叶变换的比率(即带电矩的比率)采取一个非常简单和普遍的形式,这只取决于数量,统计和对称电荷的激发以及相对于整个系统的大小纠缠区的大小。在本文中,我们提供了数值证据,我们的公式计算功能的荷电矩在两个自由晶格理论:一维费米气体和复杂的谐波链。我们还扩展了我们的结果在两个方向:通过显示,它们也适用于激发态的相互作用理论(即磁振子状态),并通过开发一个更高的维度概括的分支点扭曲场图片,导致结果(相互作用)高维模型。
In a recent paper we studied the entanglement content of zero-density excited states in complex free quantum field theories, focusing on the symmetry resolved entanglement entropy (SREE). By zero-density states we mean states consisting of a fixed, finite number of excitations above the ground state in an infinite-volume system. The SREE is defined for theories that possess an internal symmetry and provides a measure of the contribution to the total entanglement of each symmetry sector. In our work, we showed that the ratio of Fourier-transforms of the SREEs (ie the ratio of charged moments) takes a very simple and universal form for these states, which depends only on the number, statistics and symmetry charge of the excitations as well as the relative size of the entanglement region with respect to the whole system’s size. In this paper we provide numerical evidence for our formulae by computing functions of the charged moments in two free lattice theories: a 1D Fermi gas and a complex harmonic chain. We also extend our results in two directions: by showing that they apply also to excited states of interacting theories (ie magnon states) and by developing a higher dimensional generalisation of the branch point twist field picture, leading to results in (interacting) higher-dimensional models.
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