The generation and manipulation of single photons are crucial in advanced quantum technologies, such as quantum communication and quantum computation devices. High-purity single photons can be generated from classical light using the single-photon blockade (1PB). However, the efficiency and purity are exclusive in 1PB, which hinders its practical applications. Here, we show that the resonantly coupled plasmonic-photonic cavity can boost the efficiency of single-photon generation by more than three orders of magnitude compared with that of all-dielectric microcavity. This significant improvement is attributed to two new mechanisms of atom-microcavity coupling after introducing the plasmonic cavity: the formation of a quasi-bound state and the transition to the nonreciprocal regime, due to the destructive interference between the coupling pathways and the nonzero relative phase of the closed-loop coupling, respectively. The quasi-bound state has a relatively small decaying, while its effective coupling strength is significantly enhanced. Suppressing the dissipative component of the effective atom-microcavity coupling in the nonreciprocal regime can further improve single-photon performance, particularly without temporal oscillations. Our study demonstrates the possibility of enhancing the intrinsically low efficiency of 1PB in low excitation regime, and unveils the novel light-matter interaction in hybrid cavities.

单光子的产生和操纵在先进的量子技术中至关重要，例如量子通信和量子计算设备。可以使用单光子阻断 (1PB) 从经典光中生成高纯度单光子。然而，效率和纯度在1PB中独占鳌头，阻碍了其实际应用。在这里，我们表明，与全介电微腔相比，共振耦合等离子体光子腔可以将单光子产生效率提高三个数量级以上。这种显着的改进归因于引入等离子体腔后原子-微腔耦合的两种新机制：准束缚态的形成和向非互易机制的转变，由于耦合路径和闭环耦合的非零相对相位之间的相消干涉，分别。准束缚态衰减相对较小，而其有效耦合强度显着增强。在非互易机制中抑制有效原子-微腔耦合的耗散分量可以进一步提高单光子性能，尤其是在没有时间振荡的情况下。我们的研究证明了在低激发状态下提高 1PB 固有低效率的可能性，并揭示了混合腔中新的光-物质相互作用。在非互易机制中抑制有效原子-微腔耦合的耗散分量可以进一步提高单光子性能，尤其是在没有时间振荡的情况下。我们的研究证明了在低激发状态下提高 1PB 固有低效率的可能性，并揭示了混合腔中新的光-物质相互作用。在非互易机制中抑制有效原子-微腔耦合的耗散分量可以进一步提高单光子性能，尤其是在没有时间振荡的情况下。我们的研究证明了在低激发状态下提高 1PB 固有低效率的可能性，并揭示了混合腔中新的光-物质相互作用。