Tunable spatial decoherers for polarization-entangled photons
Graciana Puentes, Dirk Voigt, Andrea Aiello, J. P. Woerdman · Optics Letters · 2006
We report a novel controllable source of spatial decoherence for twin photons, based upon commercially available wedge depolarizers. This allows us to convert the polarization-entangled singlet state into a tunable mixed state. A full characterization of this mixed state, by means of quantum tomography, shows that such a spatial decoherer can be used for synthesizing Werner-like states on demand.