Quantum-Mechanical Saturation in Resonance Fluorescence
I. R. Senitzky · Physical Review A · 1972
A number of radiating two-level systems subject to an external resonant driving field are treated as a single angular momentum system. It is shown that the damping of the oscillation of the energy expectation value is the result of quantum-mechanical averaging over an ensemble of experiments, the energy oscillation in a single experiment being undamped.