Also in 1974 he made the first observation of sub-Poissonian statistics for light (via a violation of the Cauchy–Schwarz inequality for classical electromagnetic fields), and thereby, for the first time, demonstrated an unambiguous particle-like character for photons.
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CHSH stands for John Clauser, Michael Horne, Abner Shimony and Richard Holt, who described it in a much-cited paper published in 1969 (Clauser et al., 1969).