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If a scientific discipline should be reduced to one concept only, quantum optics could be defined as the science of photons correlations.
The first experimental evidence of non-classical light is from Burnham and Weinberg.[1]
(in no particular order)
Historically, the field of quantum op tics has been strongly rooted in the growing awareness start ing around 1960 of the consequences in photodetection ex periments of the difference between means of operator products and products of operator means