Abstract
The dynamics of an ensemble of two-level atoms injected intoa single-mode cavity is studied in the exact atom-fieldinteraction situation, in which the counter-rotating termsdescribing the so-called virtual photon processes neglected in therotating-wave approximation, are considered. The cavity mode isdriven by the injected classical field, and the atom is preparedin a coherent superposition of the two levels. We first derive thegeneralized Lorenz–Haken equation by using the technique ofquantum Langevin equation, and then numerically study the dynamicsof this equation. We find that the virtual photon processes havestrong effects on the dynamics, which can cause the trajectory inphase space of strange attractor spiral around four focus points,and the trajectory is modulated by virtual photon processes. Thechaos region in parameter space is now enlarged. It should bestressed that the strange attractor can exist in opticalbistability, and whether the atomic coherences and classical field caninhibit chaos depends on the laser frequency.
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