Abstract: Under the condition of classical limit, quantized Dicke model shows the dynamical behavior of quantum chaos. The numerical calculation shows that there are some particular points in the classical phasespace at which the quantum chaos is present. The impact of initial conditions of these particular positions on entanglement of the model was analyzed respectively under RWA (rotatingwave approximation) or nonRWA. The evolutionary characteristics of the overall dynamics were studied in the phasespace for all the phase points considered to be under the initial condition. The conclusion obtained is that classical chaos will accelerate the generation of entanglement.

Key words: quantum chaos, non-rotating-wave approximation, entanglement dynamics