Experimental four-qubit bound entanglement

被引：73

作者：

Amselem, Elias ^{[1
]}

Bourennane, Mohamed ^{[1
]}

机构：

[1] Stockholm Univ, Dept Phys, S-10691 Stockholm, Sweden

来源：

NATURE PHYSICS | 2009年 / 5卷 / 10期

基金：

瑞典研究理事会;

关键词：

MIXED STATES; SEPARABILITY CRITERION; DENSITY-MATRICES; QUANTUM;

D O I：

10.1038/NPHYS1372

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Entanglement is one of the most puzzling features of quantum theory and of great importance for the new field of quantum information. Being a peculiar form of entanglement, bound entanglement emerges in certain mixed quantum states. This form of entanglement is not distillable by local operators and classical communication. Bound-entangled states are different from both the free entangled (distillable) and separable states. Here we report on the first experimental demonstration of a four-qubit polarization bound-entangled state, the so-called Smolin state. We have fully characterized its entanglement properties. Moreover, we have realized unlocking of the entanglement protocol for this state. The special properties of the Smolin state constitute a useful quantum resource for new multiparty communication schemes.

引用

页码：748 / 752

页数：5

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