Brightness and purity of a room-temperature single-photon source in the blue-green range

We discuss a promising solid-state system that emits sin-gle photons at room temperature in the blue-green range, making it an attractive candidate for quantum communi-cations in free space and underwater. The active element is a core-shell ZnSe tapered nanowire embedding a single CdSe quantum dot grown by molecular beam epitaxy. A pat-terned substrate enables a comprehensive study of a single nanowire using various methods. Our source shows poten-tial for achieving a total brightness of 0.17 photon per pulse and anti-bunching with g(2)(0) < 0.3 within a restricted spec-tral window. Additionally, we analyze the impact of charged excitons on the g(2)(0) value in different spectral ranges.& COPY; 2023 Optica Publishing Group