  We propose a reliable scheme to recover the conventional photon blockade
effect in the dispersive Jaynes-Cummings model, which describes a two-level
atom coupled to a single-mode cavity field in the large-detuning regime. This
is achieved by introducing a transversal driving to the atom and then photonic
nonlinearity is obtained. The eigenenergy spectrum of the system is derived
analytically and the photon blockade effect is confirmed by numerically
calculating the photon-number distributions and equal-time second-order
correlation function of the cavity field in the presence of system
dissipations. We find that the conventional photon blockade effect can be
recovered at proper atomic and cavity-field drivings. This work will provide a
method to generate the conventional photon blockade effect in the dispersively
coupled quantum optical systems.
