engleski

Preselected Sub-Poissonian Correlations

The simplest possible photon-number-squeezed states containing only two photons and exhibiting sub-poissonian statistics with Fano factor approaching 0.5 have been used for a proposal of a loophole-free Bell experiment requiring only 67% of detection efficiency. The states are obtained by the fourth order interference between first of two photons at an asymmetrical beam splitter and thereupon of two photons from two independent singlets at an asymmetrical beam splitter. In the latter setup the other two photons which nowhere interacted and whose paths never crossed appear entangled in a singlet-like correlated state.

squeezed states; sub-poissonian correlations

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