criteria for a similar system when $\Omega=0$, $\theta=0$ and $\gamma=\Gamma$ has the same form except near $\eta=0$ where significant disparity was observed at steady state [@jpb42215506]. The main aim here is shifted to the study of the time evolution of the entanglement upon using $\gamma/\Gamma$ and $\theta$ as a probe. It is worth noting that the detailed analysis of the degree of entanglement that can be quantified by the criterion following from DGCZ has been presented in connection with the degree of two-mode squeezing elsewhere [@sint]. In earlier work, the oscillatory nature of the entanglement was not observed since the amplitude of the driving radiation was set to be $\Omega\ge0.5\Gamma$. With the aid of the calculation presented earlier, the variance of the quadrature operators ($\Delta u^{2}+\Delta v^{2}$) and the smallest eigenvalue of the symplectic matrix ($V_{s}$) are plotted against $time$ for various parameters. In the plot ($\Delta u^{2}+\Delta v^{2}$) is multiplied by half so that comparison can be as straightforward as possible.

![\[fig9\] Plots of the time evolution of the smallest eigenvalue ($V_{s}$) and variance of the EPR operators ($\Delta u^{2}+\Delta v^{2}$) of the cavity radiation for $\kappa = 0.5$, $\theta=0.25$, $A=25$, $\Omega=0$ and $\gamma=0.75\Gamma$.](pe11.eps){height="6.5cm"}

![\[fig10\] Plots of the time 