Partial Bell-State Analysis with Parametric down Conversion in the Wigner Function Formalism by A. Casado, S. Guerra, J. Plácido

“…In particular, the fermionic behaviour of two photons in the singlet state is explained from the invariance on the correlation properties of two light beams going through a balanced beam-splitter. Moreover, we show that a Bell-state measurement introduces some fundamental noise at the idle channels of the analyzers. …”
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