Entanglement negativity and entropy in non-equilibrium conformal field theory

Entanglement negativity and entropy in non-equilibrium conformal field theory
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非平衡共形场论中的纠缠负性和熵

DOI:
10.1016/j.nuclphysb.2015.06.021
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发表时间:
2015
期刊:
影响因子:
2.8
通讯作者:
Hoogeveen M
Hoogeveen M
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Hoogeveen M

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我们研究了一维临界量子系统在局部猝灭后的纠缠动力学,其中两个独立热化的半无限系统连接在一起形成一个均匀的无限系统,并保持幺正演化。我们表明,在一定的条件下,一旦纠缠间隔内的光锥从接触点发出的非平衡稳态(NESS)瞬间达到。在这个稳态下,纠缠熵和对数负性的精确表达式与稳态密度矩阵是一个提升的热态,正如预期的那样。我们得出各种一般的身份:与不平等的左,右初始温度与左,右温度相等的淬火后的负相关;并与这些负平衡热状态。在某些情况下,所得到的表达式可以进行分析评估。在间隔与光锥相交之后,我们发现对数增长。对于一个很长的时间间隔,我们发现负性在足够长的时间后接近一个平台,不同于它的NESS值。一旦整个间隔包含在光锥中,NESS值立即达到。这提供了一个理论框架,解释最近获得的数值结果。
We study the dynamics of the entanglement in one-dimensional critical quantum systems after a local quench in which two independently thermalized semi-infinite halves are joined to form a homogeneous infinite system and left to evolve unitarily. We show that under certain conditions a nonequilibrium steady state (NESS) is reached instantaneously as soon as the entanglement interval is within the light cone emanating from the contact point. In this steady state, the exact expressions for the entanglement entropy and the logarithmic negativity are in agreement with the steady state density matrix being a boosted thermal state, as expected. We derive various general identities: relating the negativity after the quench with unequal left and right initial temperatures with that where the left and right temperatures are equal; and relating these with the negativity in equilibrium thermal states. In certain regimes the resulting expressions can be analytically evaluated. Immediately after the interval intersects the light cone, we find logarithmic growth. For a very long interval, we find that the negativity approaches a plateau after sufficiently long times, different from its NESS value. The NESS value is reached instantly as soon as the entire interval is contained in the light cone. This provides a theoretical framework explaining recently obtained numerical results.
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