Cavity QED and Quantum Computation in the Weak Coupling Regime
  In this paper we consider a model of quantum computation based on n atoms of laser-cooled and trapped linearly in a cavity and realize it as the n atoms Tavis-Cummings Hamiltonian interacting with n external (laser) fields.   We solve the Schr{\" o}dinger equation of the model in the case of n=2 and construct the controlled NOT gate by making use of a resonance condition and rotating wave approximation associated to it. Our method is not heuristic but completely mathematical, and the significant feature is a consistent use of Rabi oscillations.   We also present an idea of the construction of three controlled NOT gates in the case of n=3 which gives the controlled-controlled NOT gate. 
Kazuyuki Fujii, Kyoko Higashida, Ryosuke Kato and Yukako Wada