NUMERICAL STUDY OF SQUEEZING IN THE JAYNES-CUMMINGS MODEL WITH AND WITHOUT THE ROTATING WAVE APPROXIMATION

Dipole squeezing in the Jaynes-Cummings model with and without the rot ating wave approximation (RWA) has been numerically studied when restr icted to the following initial conditions: the field in the superposit ion of the vacuum and one-photon state, and the atom in the ground sta te. Numerical results show that even if under the condition for which the RWA is considered to be valid, there is a significant effect cause d by the virtual-photon field on the dipole squeezing; in the cases of sufficiently strong coupling of the atom-field interaction, the inter ference between the virtual-photon processes and the real-photon proce sses quenches the dipole squeezing.