Experimental four-qubit bound entanglement

被引：72
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.
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收藏
页码：748 / 752
页数：5
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