Violation of Bell’s Inequality with Photons from Independent Sources
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T. B. Pittman and J. D. Franson, Violation of Bell’s Inequality with Photons from Independent Sources, Phys. Rev. Lett. 90 (24) 0401 (2003), DOI:https://doi.org/10.1103/PhysRevLett.90.240401
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©2003 The American Physical Society
©2003 The American Physical Society
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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.