The experimental conditions under which the intensity correlation function from a single atom undergoing resonance fluorescence may be observed are studied. As was pointed out by Jakeman et al. (1977), even under optimum conditions the number of fluctuations in the atomic beam prevent a direct observation of photon antibunching under the subsequent normalisation scheme used by Kimble et al. (1977). However, a direct observation of photon antibunching is possible in principle by adopting alternative normalisation schemes of the intensity correlation function.
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Carmichael et al. (1978) studied this question.
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