High-purity single-mode photon source for integrated quantum photonics

摘要

Integrated quantum photonics relies critically on photon sources that have great purity, single-mode property, scalability, integrability and flexibility for both integrated quantum computing and long-haul quantum communication. Here we report a photon-pair/single-photon source that utilizes cavity-enhanced four-wave mixing in a high-Q silicon microresonator. The photon-pair source has a spectral brightness of 6.25 × 10~8 pairs/s/mW~2/GHz and a quantum cross-correlation of g_(si)~(2) (0) = (2.58 ± 0.16) × 10~4. The generated photons are single-mode, with a quantum self-correlation of 1.87 ± 0.05. The heralded single photons has conditional photon autocorrelation g_c~(2) as low as 0.0075 ± 0.0017 at 5.9 × 10~4 pair/s.