Phys. Rev. Lett. 28, 938–941 (1972)Experimental Test of Local Hidden-Variable TheoriesReceived 4 February 1972; published in the issue dated 3 April 1972 We have measured the linear polarization correlation of the photons emitted in an atomic cascade of calcium. It has been shown by a generalization of Bell's inequality that the existence of local hidden variables imposes restrictions on this correlation in conflict with the predictions of quantum mechanics. Our data, in agreement with quantum mechanics, violate these restrictions to high statistical accuracy, thus providing strong evidence against local hidden-variable theories. © 1972 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.28.938
DOI:
10.1103/PhysRevLett.28.938
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