Jaynes–Cummings model
In quantum optics, the Jaynes–Cummings model (sometimes abbreviated JCM) is a theoretical model that describes the system of a two-level atom interacting with a quantized mode of an optical cavity (or a bosonic field). The model assumes the rotating-wave approximation, neglects dissipation initially, and treats only a single field mode and a two-level atom, with or without the presence of light (in the form of a bath of electromagnetic radiation that can cause spontaneous emission and absorption).