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The conventional photon blockade for high-frequency mode is investigated in atwo-mode second-order nonlinear system embedded with a two-level atom. Bysolving the master equation and calculating the zero-delay-time second-ordercorrelation function $g^{(2)}(0)$, we obtain that strong photon antibunchingcan be achieved in this scheme. In particular, we find that by increasing thelinear coupling coefficient of the system, a perfect blockade region will beformed near the zero second-order nonlinear coupling coefficient. Similarly, byincreasing the nonlinear coupling coefficient of the system, the perfectblockade zone will appear. And this scheme is not sensitive to the reservoirtemperature, both of which make the current system easier to implementexperimentally.

Tunable photon blockade in a two-mode second-order nonlinear system embedded with a two-level atom