Enhanced unconventional photon blockade in coupled optical cavities

Quantum information processing, a key component of quantum information science, has attracted considerable attention. Its realization requires physical platforms and resources,among which optical systems and single-photon sources based on photon blockade (PB)have been widely employed. Here we investigate PB behaviors in a coupled optical cavity system driven by both single- and two-photon felds. The optimal conditions for PB are obtained with respect to the two-photon driving strength and cavity-laser detuning via analytical calculations. Using these optimal solutions, we show that a signifcant PB efect is achievable even with weak Kerr nonlinearity, and confrm that this behavior corresponds to unconventional photon blockade (UPB) through a comparison of the second- and third-order correlation functions. Furthermore, our analysis reveals that UPB can be enhanced by two-photon dissipation. These results provide theoretical strategies for enhancing UPB, and ofer insight into its fundamental mechanism.