title: Violation of Bell's inequality with photons from independent sources.
abstract: We report a violation of Bell's inequality using one photon from a parametric down-conversion source and a second photon from an attenuated laser beam. The two photons were entangled at a beam splitter using the postselection technique of Shih and Alley [Phys. Rev. Lett. 61, 2921 (1988)]]. A quantum interference pattern with a visibility of 91% was obtained using the photons from these independent sources, as compared with a visibility of 99.4% using two photons from a central parametric down-conversion source.
authors.affiliation: Johns Hopkins University, Applied Physics Laboratory, Laurel, Maryland 20723, USA.
authors.forename: T B
authors.initials: TB
authors.lastname: Pittman
authors.forename: J D
authors.initials: JD
authors.lastname: Franson