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Rabi CycleThe Rabi cycle is a term from the field of quantum optics. When an atom (or some other two-level system) is illuminated by a coherent beam of photons, it will cyclically absorb photon and re-emit them by stimulated emission. One such cycle is called a Rabi cycle and the inverse of its duration the Rabi frequency of the photon beam. This mechanism is fundamental to quantum optics. It can be modelled using the Jaynes-Cummings model and the Bloch vector formalism. For example, in a two-state atom (an atom in which an electron can either be in the excited or ground state), the probability of finding the atom in the excited state is found from the Bloch equations to be: where is the Rabi frequency. The name is in reference to Isidor Isaac Rabi.
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