Single-photon generation by quantum emitters of specially designed nanostructures can be strongly influenced by the immediate environment, resulting in dramatically enhanced emission rates, along with funneling emission into a well-defined (in terms of propagation direction and polarization state) radiation channel. Single-photon generation engineering thus compels one to search for the configuration incorporating a highly resonant nanocavity coupled to a quantum emitter and to a directional antenna or an optical waveguide. Significant progress has been achieved in understanding physical mechanisms involved in single-photon generation, and impressive experimental demonstrations of ultrabright, polarized, and directional single-photon sources have been reported. At the same time, targeting highly desirable room-temperature generation of indistinguishable single photons, especially when efficiently funneled into single-mode optical waveguides, poses many serious challenges, which are discussed in this Perspective, along with possible ways to tackle these challenges.

中文翻译：

---

单光子生成工程

由专门设计的纳米结构的量子发射器产生的单光子会受到周围环境的强烈影响，导致发射率显着提高，同时将发射漏斗到明确定义的（在传播方向和极化状态方面）辐射通道。因此，单光子生成工程迫使人们寻找一种包含耦合到量子发射器和定向天线或光波导的高共振纳米腔的配置。在理解涉及单光子生成的物理机制方面取得了重大进展，并且已经报道了令人印象深刻的超亮、偏振和定向单光子源的实验演示。同时，