Correlation functions and the AC Stark effect

B. Renaud, R. M. Whitley and C. R. Stroud, Jr.

J. Phys. B 9, L19 (1976).

A Heisenberg picture QED treatment is presented of the resonance fluorescence of a two-level atom. It is shown that the equations of motion for first-order correlation functions have an asymmetry with respect to the two time arguments. This asymmetry arises in a correct and careful evaluation of the unequal-time commutator between free-field and atomic operators. General solutions of these equations are found without going to the stationary limit

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