Experimental detection of entanglement via witness operators and local measurements

被引：93

作者：

Gühne, O

Hyllus, P

Bruss, D

Ekert, A

Lewenstein, M

Macchiavello, C

Sanpera, A

机构：

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

[2] Univ Cambridge, Dept Appl Math & Theoret Phys, Cambridge CB3 OWA, England

[3] Dipartimento Fis A Volta, I-27100 Pavia, Italy

[4] INFM, Unita Pavia, I-27100 Pavia, Italy

来源：

JOURNAL OF MODERN OPTICS | 2003年 / 50卷 / 6-7期

关键词：

D O I：

10.1080/0950034021000057932

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

In this paper we address the problem of detection of entanglement using only few local measurements when some knowledge about the state is given. The idea is based on an optimized decomposition of witness operators into local operators. We discuss two possible ways of optimizing this local decomposition. We present several analytical results and estimates for optimized detection strategies for NPT states of 2 x 2 and N x M systems, entangled states in 3 qubit systems, and bound entangled states in 3 x 3 and 2 x 4 systems.

引用

页码：1079 / 1102

页数：24

共 36 条

[1] Classification of mixed three-qubit states -: art. no. 040401 [J].