Entanglement Negativity at Measurement-Induced Criticality

Entanglement Negativity at Measurement-Induced Criticality
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测量引起的临界状态下的纠缠负性

DOI:
10.1103/prxquantum.2.030313
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发表时间:
2020
期刊:
影响因子:
9.7
通讯作者:
M. Fisher
M. Fisher
中科院分区:
物理与天体物理1区
文献类型:
--
作者:
Shengqi Sang;Yaodong Li;Tianci Zhou;Xiao Chen;T. Hsieh;M. Fisher

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我们提出纠缠负性作为测量引起的临界性的细粒度探针。我们激励这个建议在稳定状态,在两个不相交的子区域,比较他们的“相互否定性”和他们的相互信息导致一个精确的区分两体和多体纠缠。在一个只测量的稳定电路,映射到二维临界渗流,我们表明,互信息和互负的边界共形字段不同的缩放尺寸在长距离。然后,我们考虑一类“混合”电路模型,通过扰动的测量只电路与单一的门的渐进水平的复杂性。虽然其他临界指数在其各自的临界点处对于酉门系综的不同选择有明显的变化,但互负性在许多混合电路中具有标度维度3,这与渗流中的标度维度显著不同。我们对比我们的结果与限制的情况下,几何最小切割图片是可用的。
We propose entanglement negativity as a fine-grained probe of measurement-induced criticality. We motivate this proposal in stabilizer states, where for two disjoint subregions, comparing their "mutual negativity" and their mutual information leads to a precise distinction between bipartite and multipartite entanglement. In a measurement-only stabilizer circuit that maps exactly to two-dimensional critical percolation, we show that the mutual information and the mutual negativity are governed by boundary conformal fields of different scaling dimensions at long distances. We then consider a class of "hybrid" circuit models obtained by perturbing the measurement-only circuit with unitary gates of progressive levels of complexity. While other critical exponents vary appreciably for different choices of unitary gate ensembles at their respective critical points, the mutual negativity has scaling dimension 3 across remarkably many of the hybrid circuits, which is notably different from that in percolation. We contrast our results with limiting cases where a geometrical minimal-cut picture is available.
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