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Phys Rev Lett. 2003 Jun 20;90(24):240401. Epub 2003 Jun 19.

Violation of Bell's inequality with photons from independent sources.

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  • 1Johns Hopkins University, Applied Physics Laboratory, Laurel, Maryland 20723, USA.


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.

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