Expressions are derived for the probability p(n) that n photons are emitted in a given time in the steady state by a two-level atom, when it is placed in a resonant, coherent, exciting field. The distribution p(n) is shown to be narrower than Poissonian. The ratio [〈(Δn)2〉 − 〈n〉]/〈n〉 is negative and has an absolute maximum value of 3/4. The possibility of observing the sub-Poissonian statistics is discussed briefly.
© 1979 Optical Society of America
Original Manuscript: March 29, 1979
Published: July 1, 1979
L. Mandel, "Sub-Poissonian photon statistics in resonance fluorescence," Opt. Lett. 4, 205-207 (1979)