[1] Tavis M,Cummings F W.Exact solution for an N-molecule-radiation-field Hamiltonias. Phys. Rev., 1968, 170; 2: 379~384
[5] Barnett S M,Dupertuis M A.Multiatiom squeezed states:A new class of collective atomic state. J. Opt. Soc. Am. B, 1987,4;4:505~511
[6] Agarwal G S.Vacuum-field Rabi oscillations of atoms in a cavity.J.Opt.Soc.Am.;B,1985,2;3:480~485