Entanglement of superpositions

被引：79

作者：

Linden, Noah ^{[1
]}

Popescu, Sandu

Smolin, John A.

机构：

[1] Univ Bristol, Dept Math, Bristol BS8 1TW, Avon, England

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

[3] Hewlett Packard Labs, Bristol BS12 6QZ, Avon, England

[4] IBM Corp, TJ Watson Res Ctr, Yorktown Hts, NY 10598 USA

来源：

PHYSICAL REVIEW LETTERS | 2006年 / 97卷 / 10期

关键词：

D O I：

10.1103/PhysRevLett.97.100502

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Given a bipartite quantum state (in arbitrary dimension) and a decomposition of it as a superposition of two others, we find bounds on the entanglement of the superposition state in terms of the entanglement of the states being superposed. In the case that the two states being superposed are biorthogonal, the answer is simple, and, for example, the entanglement of the superposition cannot be more than one ebit more than the average of the entanglement of the two states being superposed. However, for more general states, the situation is very different.

引用

页数：4

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