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The '''rotating wave approximation''' is an approximation used in [[atom optics]] and [[Nuclear magnetic resonance|magnetic resonance]]. In this approximation, terms in a [[Hamiltonian (quantum mechanics)|Hamiltonian]] which oscillate rapidly are neglected. This is a valid approximation when the applied electromagnetic radiation is near resonance with an atomic transition, and the intensity is low.<ref name="WuYang2007">{{cite journal|last1=Wu|first1=Ying|last2=Yang|first2=Xiaoxue|title=Strong-Coupling Theory of Periodically Driven Two-Level Systems|journal=Physical Review Letters|volume=98|issue=1|year=2007|issn=0031-9007|doi=10.1103/PhysRevLett.98.013601}}</ref> Explicitly, terms in the Hamiltonians which oscillate with frequencies <math>\omega_L+\omega_0 </math> are neglected, while terms which oscillate with frequencies <math>\omega_L-\omega_0 </math> are kept, where <math> \omega_L </math> is the light frequency and <math> \omega_0</math> is a transition frequency.
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