Unlocking hidden entanglement with classical information

被引：72

作者：

Cohen, O ^{[1
]}

机构：

[1] Univ London Birkbeck Coll, Theoret Phys Res Unit, London WC1E 7HX, England

来源：

PHYSICAL REVIEW LETTERS | 1998年 / 80卷 / 11期

关键词：

D O I：

10.1103/PhysRevLett.80.2493

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The notion of "hidden" entanglement is introduced, and it is shown that this is a property associated with every separable mixed quantum state of two subsystems. The hidden entanglement is explicitly quantified for a general class of separable mixed states of two spin-1/2 particles, and a formula is derived giving the maximum amount of entanglement that can be hidden. The process of "unlocking" hidden entanglement with classical information is explained, and the number of bits required to unlock each ebit of entanglement is evaluated. It is argued that the entanglement-unlocking process can be seen as the converse of quantum cryptography schemes that use EPR pairs.

引用

页码：2493 / 2496

页数：4

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