The collapses and revivals in the evolution of the atomic population inversion a()|n) If initially in Photonic Fock state e,n> b()|n+1) This is the quantum rabi oscillation. a(o)=cos (gtV/n+I b(O)=sin(g√n+ If initially in photonic coherent state (0)>ag>e aa+-a2/2 10>g> n=<a|aa|a>=|a|2 population inversion under rWa can be evaluated analytically C 12n plt) -|a2 ∑cos(g、m+1)=F(On) M.O. Scully and M. S. Zubairy, Quantum optic Cambridge University Press, Cambridge, 1997The collapses and revivals in the evolution of the atomic population inversion 2 / 2 0 | (0) | | | 0 | a g e g     + − − =  =   2 n a a    | | | | + = = 2 2 | | | | ( ) cos(2 1) ( ) ! n rwa n p t e gt n F t n    − = + =  Population inversion under RWA can be evaluated analytically M. O. Scully and M. S. Zubairy, Quantum Optics, Cambridge University Press, Cambridge, 1997 If initially in Photonic Fock state |e, n> This is the quantum Rabi oscillation. ( ) ( ) 2 2 2 2 ( ) | | ( ) | 1 ( ) cos 1 ( ) sin 1 a t n t b t n a t gt n b t gt n     =   +    = + = + If initially in photonic coherent state