Quantum entanglement of a large number of photons

被引：123

作者：

Eisenberg, HS ^{[1
]}

Khoury, G

Durkin, GA

Simon, C

Bouwmeester, D

机构：

[1] Univ Calif Santa Barbara, Dept Phys, Santa Barbara, CA 93106 USA

[2] Univ Oxford, Ctr Quantum Computat, Oxford OX1 3PU, England

[3] Univ Grenoble 1, CNRS, Spectrometrie Phys Lab, F-38402 St Martin Dheres, France

来源：

PHYSICAL REVIEW LETTERS | 2004年 / 93卷 / 19期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevLett.93.193901

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A bipartite multiphoton entangled state is created through stimulated parametric down-conversion of strong laser pulses in a nonlinear crystal. It is shown how detectors that do not resolve the photon number can be used to analyze such multiphoton states. Entanglement of up to 12 photons is detected using both the positivity of the partially-transposed density matrix and a newly derived criteria. Furthermore, evidence is provided for entanglement of up to 100 photons. The multiparticle quantum state is such that even in the case of an overall photon collection and detection efficiency as low as a few percent, entanglement remains and can be detected.

引用

页码：193901 / 1

页数：4

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