Dynamical Collapse for Photons

Pei Qi-ming

The dynamic behavior of atoms in time-dependent nonlinear J-C model is studied. The influ- ence of pulse width and average photon number on dynamic behavior of atoms as the atoms are cou- pled with photon field in the form of time pulse is discussed. The result shows that when the average photon number is fixed in the field,with the increase of pulse width,the collapse and revival number are enhanced,while the time of collapse and period of revival are reduced. When the pulse width is fixed,the time of collapse and revival period are reduced gradually with the increase of pulse width in the field.

A. Ll. Hughes, G. E. M. Jauncey

Zhi‐Ming Zhang, Lei Xu, Zhenfei Luo

The effects of the dipole-dipole interaction on atomic dynamics in M-photon processes are studied. The general expression for atomic inversion in an arbitrary initial field state is presented. We find that, generally, there are three series of collapse revivals. If the dipole-dipole interaction can be neglected, there will be two series of collapse revivals. If the field is strong enough, there will be only one series of collapse revival; this is similar to the one-atom case.

Euan J. Squires

Minos A. Neto, José Antonio Roversi, M. P. Sharma

Photon dynamics of a radiation field, prepared in the thermocoherent state and interacting with an N-level atomic system, are studied theoretically. It is observed that the phenomenon of collapse and revival has strong dependence on the number of levels the atom has. It is also observed that the collapse and revival phenomenon is very sensitive to the initial number of photons present in the system, to the coupling constants, and to the detuning.

Megan Agnew