Entanglement test on a microscopic-macroscopic system

被引：94
|
作者：
De Martini, Francesco [1 ,2 ,3 ]
Sciarrino, Fabio [1 ,2 ,4 ]
Vitelli, Chiara [1 ,2 ]
机构：
[1] Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy
[2] Consorzio Nazl Interuniv Sci Fis Materia, I-00185 Rome, Italy
[3] Accad Nazl Lincei, I-00165 Rome, Italy
[4] Ctr Studi & Ric Enrico Fermi, I-00184 Rome, Italy
来源：
PHYSICAL REVIEW LETTERS | 2008年 / 100卷 / 25期
关键词：
Photons;
D O I：
10.1103/PhysRevLett.100.253601
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
A macrostate consisting of N approximate to 3.5 x 10(4) photons in a quantum superposition and entangled with a far apart single-photon state (microstate) is generated. Precisely, an entangled photon pair is created by a nonlinear optical process; then one photon of the pair is injected into an optical parametric amplifier operating for any input polarization state, i.e., into a phase-covariant cloning machine. Such transformation establishes a connection between the single photon and the multiparticle fields. We then demonstrate the nonseparability of the bipartite system by adopting a local filtering technique within a positive operator valued measurement.
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页数：4
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