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==Experimental evidence of the photon==
It is often believed that the photoelectric effect or Compton scattering are proof of the existance of photons. While these effects are compelling evidence for quantized light, they are not proof because they can be explained with a semi-classical model where light is treated like normal EM radiation. An experiment that proves the existance of photons would require results that can not be explained classically and require quantized light for a proper explanation. The first experiment of this kind was performed in 1974 by Clauser <ref>J. F. Clauser, " Experimental distinction between the quantum and classical field-theoretic predictions for the photoelectric effect", ''Phys. Rev. D'' '''9''', 853–860 (1974)</ref>. This paper reports the violation of an inequality derived from the [[Cauchy–Schwarz inequality]] and requires a good understanding of the behavior of photons to appreciate. In 1977 Kimble ''et. al'' performed an experiment, showing the anti-bunching effect of photons interacting with a beam splitter, that is a little easier to understand <ref>H. J. Kimble, M. Dagenais, and L. Mandel, "Photon Anti-bunching in Resonance Fluorescence", ''Phys. Rev. Lett.'' '''39''', 691 (1977)</ref>. The most direct evidence of quantized light came in 1986 when Grangier ''et. al'' performed a similar but much simpler anti-correlation experiment with single photons incident on a beam splitter <ref>P. Grangier, G. Roger, and A. Aspect, "Experimental Evidence for a Photon Anticorrelation Effect on a Beam Splitter: A New Light on Single-Photon Interferences". ''Europhysics Letters'' '''1''', 501-504 (1986)</ref>.
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