Symmetry analyzer for nondestructive Bell-state detection using weak nonlinearities

被引：275
作者：
Barrett, SD
Kok, P
Nemoto, K
Beausoleil, RG
Munro, WJ
Spiller, TP
机构：
[1] Hewlett Packard Labs, Bristol BS34 8QZ, Avon, England
[2] Natl Inst Informat, Chiyoda Ku, Tokyo 1018430, Japan
[3] Hewlett Packard Labs, Redmond, WA 98052 USA
来源：
PHYSICAL REVIEW A | 2005年 / 71卷 / 06期
关键词：
D O I：
10.1103/PhysRevA.71.060302
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We describe a method to project photonic two-qubit states onto the symmetric and antisymmetric subspaces of their Hilbert space. This device utilizes an ancillary coherent state, together with a weak cross-Kerr nonlinearity, generated, for example, by electromagnetically induced transparency. The symmetry analyzer is nondestructive, and works for small values of the cross-Kerr coupling. Furthermore, this device can be used to construct a nondestructive Bell-state detector.
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页数：4
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