Homodyne tomography characterization and nonlocality of a dual-mode optical qubit

被引：92
作者：
Babichev, SA [1 ]
Appel, J [1 ]
Lvovsky, AI [1 ]
机构：
[1] Univ Konstanz, Fachbereich Phys, D-78457 Constance, Germany
来源：
PHYSICAL REVIEW LETTERS | 2004年 / 92卷 / 19期
关键词：
D O I：
10.1103/PhysRevLett.92.193601
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
A single photon, delocalized over two optical modes, is characterized by means of quantum homodyne tomography. The reconstructed four-dimensional density matrix extends over the entire Hilbert space and thus reveals, for the first time, complete information about the dual-rail optical quantum bit as a state of the electromagnetic field. The experimental data violate the Bell inequality albeit with a loophole similar to the detection loophole in photon counting experiments.
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页码：193601 / 1
页数：4
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