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We suggest that the intensity correlation function could be an important tool in the study of atomic cooperative behavior because it contains predominantly components at 0, 4 in the limit of large Rabi frequency (2) and large cooperation number. This is in contrast with the single-atom prediction where the intensity correlation function contains only frequency components at 0, 2. The master equation for the collective system is solved analytically in the secular approximation.
Agarwal et al. (Mon,) studied this question.