Abstract
It is shown that the Glauber correlation functions accounting for the velocity of photocounting do not satisfy the causality principle — the most important condition of a correct theory. It mostly concerns the velocity of photocounting of impulse signals. It is shown that every impulse follows a precursor having no physical meaning which is one wavelength ahead of the signal. Due to this fact the Glauber theory may lead to incorrect results in the case of signals having very short duration (e.g. femtosecond pulses) as well as in the case of short observation times.
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