title: Tunable spatial decoherers for polarization-entangled photons.
abstract: 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.
authors.affiliation: Huygens Laboratory, Leiden University, Leiden, The Netherlands. graciana@molphys.leidenuniv.nl
authors.forename: Graciana
authors.initials: G
authors.lastname: Puentes
authors.forename: Dirk
authors.initials: D
authors.lastname: Voigt
authors.forename: Andrea
authors.initials: A
authors.lastname: Aiello
authors.forename: J P
authors.initials: JP
authors.lastname: Woerdman