A symmetry analyzer for non-destructive Bell state detection using EIT

Barrett, Sean D. ; Kok, Pieter ; Nemoto, Kae ; Beausoleil, Raymond, G. ; Munro, William J. ; Spiller, Timothy P.

HP Development Company

关键词: deterministic Bell state measurement;    quantum communication;    quantum teleportation;   

RP-ID  :  HPL-2005-205

学科分类：计算机科学（综合）

美国|英语

来源: HP Labs

【 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 non-linearity, generated, for example, by electromagnetically induced transparency. The symmetry analyzer is non-destructive, and works for small values of the cross-Kerr coupling. Furthermore, this device can be used to construct a non-destructive Bell state detector. Notes: Kae Nemoto, National Institute of Informatics, 2-1-2 Hitotsubashi, Chiyoda-ku, Tokyo 101-8430, Japan 5 Pages