论文标题
量子淬灭后的相关度量和纠缠楔形横截面
Correlation measures and the entanglement wedge cross-section after quantum quenches in two-dimensional conformal field theories
论文作者
论文摘要
在各种量子淬灭之后,我们考虑了二维形式的保形场理论中混合状态相关度量测量的时间演变,例如对数消极,奇特的熵和反射的熵。这些相关度量在全息环境中都与纠缠楔横截面有关。我们对比各种类别的保形场理论,包括理性和非理性(纯)保形场理论。首先,对于合理的保形场理论(准粒子图片)可以很好地描述其动力学,而无论特定的淬灭协议如何,我们都会发现所有四个数量的脱节间隔是成比例的。其次,使用光锥引导程序,我们将结果推广到非理性的保形场理论,在该理论中,我们发现了与准粒子结果的明显区别以及共同信息与其他措施之间的差异。相对于相互信息的对数消极情绪的巨大盈余迫使我们重新考虑哪些相互信息和对数消极情绪真正衡量。我们将这些结果解释为在非理性理论中争夺信息和混乱的签名。这些CFT结果与我们的引力(全息)计算完全一致。此外,使用全息图,我们能够将结果推广到光锥极限之外。最后,由于非理性理论的准粒子图片的细分,我们呼吁以随机的单一电路作为现象学描述,以随机的统一回路动机。我们观察到,由局部希尔伯特空间维度确定的随机统一电路与非理性(包括全息)保形场理论完全相同的纠缠动力学。
We consider the time evolution of mixed state correlation measures in two-dimensional conformal field theories, such as logarithmic negativity, odd entropy, and reflected entropy, after quantum quenches of various kinds. These correlation measures, in the holographic context, are all associated to the entanglement wedge cross section. We contrast various classes of conformal field theories, both rational and irrational (pure) conformal field theories. First, for rational conformal field theories, whose dynamics can be well described by the quasi-particle picture, we find all four quantities for disjoint intervals to be proportional, regardless of the specific quench protocol. Second, using the light cone bootstrap, we generalize our results to irrational conformal field theories where we find sharp distinctions from the quasi-particle results and striking differences between mutual information and the other measures. The large surplus of logarithmic negativity relative to mutual information forces us to reconsider what mutual information and logarithmic negativity really measure. We interpret these results as a signature of information scrambling and chaos in irrational theories. These CFT results perfectly agree with our gravitational (holographic) calculations. Furthermore, using holography, we are able to generalize the results to outside of the light cone limit. Finally, due to the breakdown of the quasi-particle picture for irrational theories, we appeal to the "line-tension picture," motivated by random unitary circuits, as a phenomenological description. We observe that random unitary circuits, with local Hilbert space dimension determined by the Cardy formula, have precisely the same entanglement dynamics as irrational (including holographic) conformal field theories.