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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.


Keyword(s): deterministic Bell state measurement; quantum communication; quantum teleportation

Abstract: 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

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