Antibunched photon-pair source based on photon blockade in a nondegenerate optical parametric oscillator

Nonclassical light sources, such as correlated photon-pairs, play an\nimportant role in quantum optics and quantum information processing systems.\nThis study proposes a process to generate antibunched photon-pairs in a\nnondegenerate optical parametric oscillator. It is found that when the\nparameters of the system satisfy certain conditions, the generated photons in\nsubharmonic modes exhibit a strong antibunching behavior and are strongly\ncorrelated with one another. In particular, the average photon-pair number is\nresonantly enhanced. It is also observed that the conventional photon blockade\ncontributes to this phenomenon. In addition, it is interesting to note that\nfundamental mode photons can blockade the subharmonic mode photons. We refer to\nthis phenomenon as a heterogeneous photon blockade.\n