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

Details A symmetry analyser for non-destructive Bell state detection using EIT A symmetry analyser for non-destructive Bell state detection using EIT

2004-08-19

arxiv.org/abs/quant-ph/0408117v3

Phys. Rev. A 71, 060302 (2005)

Physics

Quantum Physics

Final published form

Scientific paper

10.1103/PhysRevA.71.060302

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.

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