Effective two-level model versus three-level model
Alice Sinatra, F. Castelli, L. A. Lugiato, Philippe Grangier, J.-Ph. Poizat · Quantum and Semiclassical Optics Journal of the European Optical Society Part B · 1995
The predictions of a full cascade three-level model are compared with those of an effective two-level model. The authors determine the conditions for agreement, both on a semiclassical and on a fully quantum level. More stringent conditions are required in the quantum case.