Quantifying Einstein-Podolsky-Rosen Steering

被引：328

作者：

Skrzypczyk, Paul ^{[1
]}

Navascues, Miguel ^{[2
]}

Cavalcanti, Daniel ^{[1
]}

机构：

[1] ICFO Inst Ciencies Foton, Castelldefels 08860, Barcelona, Spain

[2] Univ Bristol, HH Wills Phys Lab, Bristol BS8 1TL, Avon, England

来源：

PHYSICAL REVIEW LETTERS | 2014年 / 112卷 / 18期

基金：

英国工程与自然科学研究理事会;

关键词：

STATES; ENTANGLEMENT;

D O I：

10.1103/PhysRevLett.112.180404

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Einstein-Podolsky-Rosen steering is a form of bipartite quantum correlation that is intermediate between entanglement and Bell nonlocality. It allows for entanglement certification when the measurements performed by one of the parties are not characterized (or are untrusted) and has applications in quantum key distribution. Despite its foundational and applied importance, Einstein-Podolsky-Rosen steering lacks a quantitative assessment. Here we propose a way of quantifying this phenomenon and use it to study the steerability of several quantum states. In particular, we show that every pure entangled state is maximally steerable and the projector onto the antisymmetric subspace is maximally steerable for all dimensions; we provide a new example of one-way steering and give strong support that states with positive-partial transposition are not steerable.

引用

页数：5

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