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A much-needed solution for the efficient modeling of strong coupling betweenmatter and optical cavity modes is offered by mean-field mixedquantum--classical dynamics, where a classical cavity field interactsself-consistently with quantum states of matter through Ehrenfest's theorem. Wepreviously introduced a modified mean-field approach, referred to as decoupledmean-field (DC-MF) dynamics, wherein vacuum fluctuations of the cavity fieldare decoupled from the quantum-mechanical ground state as a means to resolve anunphysical drawing of energy from the vacuum fluctuations by a two-level atom.Here, we generalize DC-MF dynamics for an arbitrary number of (nondegenerate)atomic levels, and show that it resolves an unphysical lack of emission from athree-level atom predicted by conventional mean-field dynamics. We furthermoreshow DC-MF to provide an improved description of reabsorption and (resonant)two-photon emission processes.

Ehrenfest Modeling of Cavity Vacuum Fluctuations and How to Achieve Emission from a Three-Level Atom