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arXiv 1902.02844hep-thquant-ph
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基于Petz映射的纠缠楔重构

Entanglement Wedge Reconstruction using the Petz Map

Chi-Fang Chen, Geoffrey Penington, Grant Salton

摘要:

AdS/CFT最近进展的核心是子区域对偶性或纠缠楔重构的问题:边界CFT的哪些部分与体块的给定子区域对偶?这个问题可以通过求助于全息术的量子纠错特性来回答,并且最近表明,可以使用被称为旋转Petz映射的通用恢复通道来实现鲁棒的体(纠缠楔)重建。简而言之,可以使用旋转的Petz映射从边界的子集恢复批量数据。然而,该映射涉及批量和边界模块化时间的平均过程,因此在实践中评估可能有些困难。我们表明,一个简单得多的通道,Petz映射,是足够的纠缠楔重建任何代码空间的固定有限维-没有旋转是必需的。此外,重构中的误差将总是非微扰地小。从量子信息的角度来看,我们证明了一个一般定理扩展使用的Petz映射作为一个通用的恢复通道子系统和算子代数量子纠错。

英文摘要:

At the heart of recent progress in AdS/CFT is the question of subregion duality, or entanglement wedge reconstruction: which part(s) of the boundary CFT are dual to a given subregion of the bulk? This question can be answered by appealing to the quantum error correcting properties of holography, and it was recently shown that robust bulk (entanglement wedge) reconstruction can be achieved using a universal recovery channel known as the twirled Petz map. In short, one can use the twirled Petz map to recover bulk data from a subset of the boundary. However, this map involves an averaging procedure over bulk and boundary modular time, and hence it can be somewhat intractable to evaluate in practice. We show that a much simpler channel, the Petz map, is sufficient for entanglement wedge reconstruction for any code space of fixed finite dimension - no twirling is required. Moreover, the error in the reconstruction will always be non-perturbatively small. From a quantum information perspective, we prove a general theorem extending the use of the Petz map as a general-purpose recovery channel to subsystem and operator algebra quantum error correction.

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