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We report a violation of Bell's inequality using one photon from a parametricdown-conversion source and a second photon from an attenuated laser beam. Thetwo photons were entangled at a beam splitter using the post-selectiontechnique of Shih and Alley [Phys. Rev. Lett. 61, 2921 (1988)]. A quantuminterference pattern with a visibility of 91% was obtained using the photonsfrom these independent sources, as compared with a visibility of 99.4% usingtwo photons from a central parametric down-conversion source.Comment: 4 pages, 5 figures; minor change

Violation of Bell’s Inequality with Photons from Independent Sources