Four photon polarization entanglement tests and applications

被引：1

作者：

Bourennane, M

Eibl, M

Gaertner, S

Kurtsiefer, C

Weinfurter, H ^{[1
]}

Cabello, A

Gühne, O

Hyllus, P

Bruss, D

Lewenstein, M

Sanpera, A

机构：

[1] Max Planck Inst Quantum Opt, D-85748 Garching, Germany

[2] Univ Munich, Sekt Phys, D-80799 Munich, Germany

[3] Univ Seville, Dept Fis Aplicada 2, E-41012 Seville, Spain

[4] Leibniz Univ Hannover, Inst Theoret Phys, D-30167 Hannover, Germany

来源：

INTERNATIONAL JOURNAL OF QUANTUM INFORMATION | 2004年 / 2卷 / 01期

关键词：

entanglement; decoherence; communication;

D O I：

10.1142/S0219749904000134

中图分类号：

TP301 [理论、方法];

学科分类号：

081202 ;

摘要：

Multipartite entangled states are key elements for quantum information processing. Here we experimentally investigate the particular properties of a polarization-entangled four-photon state, which can be generated directly by second order parametric down-conversion. The perfect correlations and the invariance under local transformations enable one to encode one qubit of quantum information in a decoherence-free subspace and thus to communicate it safely over noisy quantum channels. Furthermore, we present an experimental method to detect genuine fourpartite entanglement using entanglement witness operators. The implementation of such operators requires only of few local polarization measurements but uniquely proves the genuine multipartite entanglement.

引用

页码：133 / 147

页数：15

共 52 条

[1] Classical and quantum communication without a shared reference frame [J].