1. 
   Rabi cycle
   In physics, the Rabi cycle is the cyclic behaviour of a two-state quantum system in the presence of an oscillatory driving field. A two-state system has two possible states, and if they are not degenerate energy levels the system can become "excited" when it absorbs a quantum of energy. The effect ...
   Found op http://en.wikipedia.org/wiki/Rabi_cycle
   
   

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