Violation of Bell’s Inequality with Photons from Independent Sources
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Type of Work4 pages
Citation of Original PublicationT. 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
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.