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.
© 2006 Optical Society of America
Original Manuscript: January 26, 2006
Revised Manuscript: April 10, 2006
Manuscript Accepted: April 11, 2006
Graciana Puentes, Dirk Voigt, Andrea Aiello, and J. P. Woerdman, "Tunable spatial decoherers for polarization-entangled photons," Opt. Lett. 31, 2057-2059 (2006)