= Rotating-wave approximation
{wiki=Rotating-wave_approximation}
The Rotating Wave Approximation (RWA) is a mathematical simplification used in quantum mechanics and quantum optics when dealing with certain types of interactions, particularly those involving oscillatory fields (such as electromagnetic fields) and quantum systems (like two-level atoms). The RWA is particularly useful in the study of systems under the influence of external coherent fields (e.g., laser light).
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