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.

引用

页数：4