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Correlations of linear polarizations of pairs of photons have been measured with time-varying analyzers. The analyzer in each leg of the apparatus is an acousto-optical switch followed by two linear polarizers. The switches operate at incommensurate frequencies near 50 MHz. Each analyzer amounts to a polarizer which jumps between two orientations in a time short compared with the photon transit time. The results are in good agreement with quantum mechanical predictions but violate Bell's inequalities by 5 standard deviations.
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Alain Aspect
Jean Dalibard
Gérard Roger
Physical Review Letters
Institut d’Optique Graduate School
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Aspect et al. (Mon,) studied this question.
www.synapsesocial.com/papers/69d832ed7392c8ce61bee96e — DOI: https://doi.org/10.1103/physrevlett.49.1804