Entanglement Rényi entropies from ballistic fluctuation theory: The free fermionic case

Entanglement Rényi entropies from ballistic fluctuation theory: The free fermionic case
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弹道涨落理论中的纠缠 Rényi 熵:自由费米子情况

DOI:
10.21468/scipostphyscore.7.1.005
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发表时间:
2023
影响因子:
3.6
通讯作者:
P. Ruggiero
P. Ruggiero
中科院分区:
--
文献类型:
--
作者:
Giuseppe Del Vecchio Del Vecchio;B. Doyon;P. Ruggiero

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纠缠熵在有限密度态中的大尺度行为,在平衡态和非平衡态,可以用粒子对的物理图像来理解。然而,这一图景的完整理论起源尚未完全确立。在这项工作中,我们澄清了这一情况,通过调查纠缠熵使用其与热力学和流体动力学波动的大偏差理论的连接。我们应用弹道起伏理论(BFT)的通用框架,基于模型的欧拉流体动力学,分支点扭曲场的相关函数,在副本方法中计算雷尼纠缠熵的起点。为了说明这些想法,我们将重点放在自由费米子系统上,证明了平衡行为和雷尼纠缠熵的动力学都可以完全从BFT中导出。特别是,我们强调,远程相关量子猝灭后发展,并解释这些解释的纠缠增长的结构。我们进一步表明,这种增长是有关的波动的电荷传输,推广到量子猝灭的电荷波动和纠缠之前观察到的关系。一般的想法,我们介绍表明,大规模的纠缠行为有其起源内的流体动力学波动。
The large-scale behaviour of entanglement entropy in finite-density states, in and out of equilibrium, can be understood using the physical picture of particle pairs. However, the full theoretical origin of this picture is not fully established yet. In this work, we clarify this picture by investigating entanglement entropy using its connection with the large-deviation theory for thermodynamic and hydrodynamic fluctuations. We apply the universal framework of Ballistic Fluctuation Theory (BFT), based the Euler hydrodynamics of the model, to correlation functions of branch-point twist fields, the starting point for computing Rényi entanglement entropies within the replica approach. Focusing on free fermionic systems in order to illustrate the ideas, we show that both the equilibrium behavior and the dynamics of Rényi entanglement entropies can be fully derived from the BFT. In particular, we emphasise that long-range correlations develop after quantum quenches, and accounting for these explain the structure of the entanglement growth. We further show that this growth is related to fluctuations of charge transport, generalising to quantum quenches the relation between charge fluctuations and entanglement observed earlier. The general ideas we introduce suggest that the large-scale behaviour of entanglement has its origin within hydrodynamic fluctuations.
DOI: 10.1088/1751-8121/acd153
发表时间: 2022-11
期刊: Journal of Physics A: Mathematical and Theoretical
影响因子: --
作者:
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DOI: 10.1103/physrevx.10.031066
发表时间: 2019-12
期刊: arXiv: Strongly Correlated Electrons
影响因子: --
作者:
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DOI: 10.1016/j.nuclphysb.2018.04.002
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期刊: Nuclear Physics B
影响因子: 2.8
作者:
Castro-Alvaredo O
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