Experimental Estimation of Entanglement at the Quantum Limit

被引：59

作者：

Brida, Giorgio ^{[1
]}

Degiovanni, Ivo Pietro ^{[1
]}

Florio, Angela ^{[1
,2
]}

Genovese, Marco ^{[1
]}

Giorda, Paolo ^{[3
]}

Meda, Alice ^{[1
]}

Paris, Matteo G. A. ^{[4
,5
]}

Shurupov, Alexander ^{[1
,6
,7
]}

机构：

[1] INRIM, I-10135 Turin, Italy

[2] Univ Bari, Dipartmento Fis, I-70126 Bari, Italy

[3] ISI Fdn, I-10133 Turin, Italy

[4] Univ Milan, Dipartimento Fis, I-20133 Milan, Italy

[5] UdR Milano, CNISM, I-20133 Milan, Italy

[6] Politecn Torino, Dipartimento Fis, I-10129 Turin, Italy

[7] Moscow MV Lomonosov State Univ, Fac Phys, Moscow 119992, Russia

来源：

PHYSICAL REVIEW LETTERS | 2010年 / 104卷 / 10期

关键词：

PARAMETRIC-DOWN-CONVERSION; SPECTRAL ENTANGLEMENT; BELL INEQUALITIES; VERIFICATION; SEPARABILITY; GEOMETRY;

D O I：

10.1103/PhysRevLett.104.100501

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Entanglement is the central resource of quantum information processing and the precise characterization of entangled states is a crucial issue for the development of quantum technologies. This leads to the necessity of a precise, experimental feasible measure of entanglement. Nevertheless, such measurements are limited both from experimental uncertainties and intrinsic quantum bounds. Here we present an experiment where the amount of entanglement of a family of two-qubit mixed photon states is estimated with the ultimate precision allowed by quantum mechanics.

引用

页数：4

共 38 条

[1] Environment-induced sudden death of entanglement [J].