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from Part II - Bell Inequalities
Published online by Cambridge University Press: 28 November 2024
We analyze interrelation of quantum and classical entanglement. The latternotion is widely used in classical optic simulation of the quantum-likefeatures of light. We criticize the common interpretation that quantum nonlocalityis the basic factor differentiating these two sorts of entanglement. Instead,we point to the Grangier experiment on photon existence, the experimenton the coincidence detection. Classical entanglement sources produce lightbeams with the coefficient of second-order coherence g(2)(0) ≥ 1. This featureof classical entanglement is obscured by using intensities of signals indifferent channels, instead of counting clicks of photodetectors. Interplaybetween intensity and clicks counting is not just a technicality. We emphasizethe foundational dimension of this issue and its coupling with theBohr’s statement on individuality of quantum phenomena.
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