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

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arxiv quant-ph/0408117 v3 pith:WIZ4PWHY submitted 2004-08-19 quant-ph

classification quant-ph
keywords non-destructivestatebellcross-kerrdevicesymmetryanalyseranalyzer
verification ladder T0 review T1 audit T2 compute T3 formal
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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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