Entanglement content of quantum particle excitations. Part II. Disconnected regions and logarithmic negativity

Entanglement content of quantum particle excitations. Part II. Disconnected regions and logarithmic negativity
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量子粒子激发的纠缠含量。

DOI:
10.1007/jhep11(2019)058
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发表时间:
2019
影响因子:
5.4
通讯作者:
Castro-Alvaredo O
Castro-Alvaredo O
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Castro-Alvaredo O

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本文研究了自由质量玻色子理论的零密度激发态相对于基态的纠缠熵和(副本)对数负性的增量。这扩展了同一作者以前两篇出版物的工作。我们考虑的情况下,两个断开的区域,发现纠缠熵的变化只取决于区域的组合大小,是独立的连接。随后,我们将这一结果推广到任何数量的不连通区域。对于副本负性,我们发现它的增量是一个多项式与整数系数只取决于两个区域的大小。对数负性的函数结构比它的副本版本更复杂,通常涉及区域大小的多项式根。我们得到我们的结果已经在以前的工作中使用的两种方法:从一个量子比特图片和通过计算有限体积中的分支点扭曲场的四点函数。我们测试我们的结果对数值模拟的谐波链,并找到很好的协议。
In this paper we study the increment of the entanglement entropy and of the (replica) logarithmic negativity in a zero-density excited state of a free massive bosonic theory, compared to the ground state. This extends the work of two previous publications by the same authors. We consider the case of two disconnected regions and find that the change in the entanglement entropy depends only on the combined size of the regions and is independent of their connectivity. We subsequently generalize this result to any number of disconnected regions. For the replica negativity we find that its increment is a polynomial with integer coefficients depending only on the sizes of the two regions. The logarithmic negativity turns out to have a more complicated functional structure than its replica version, typically involving roots of polynomials on the sizes of the regions. We obtain our results by two methods already employed in previous work: from a qubit picture and by computing four-point functions of branch point twist fields in finite volume. We test our results against numerical simulations on a harmonic chain and find excellent agreement.
DOI: 10.1063/1.5098892
发表时间: 2019
影响因子: 1.3
作者:
Castro-Alvaredo O
通讯作者: Castro-Alvaredo O
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