High coincidence-to-accidental ratio continuous-wave photon-pair generation in a grating-coupled silicon strip waveguide

• DOI: 10.7567/apex.10.062801
• Publication Date: 2017-05-25T09:14:24Z
• Authors: Kai Guo; Erik N. Christensen; Jesper B. Christe...; Jacob G. Koefoed; Davide Bacco; Yunhong Ding; Haiyan Ou; Karsten Rottwitt
• Keywords: 0103 physical sciences; 01 natural sciences; 7. Clean energy

We demonstrate a very high coincidence-to-accidental ratio of 673 using continuous-wave photon-pair generation in a silicon strip waveguide through spontaneous four-wave mixing. This result is obtained by employing on-chip photonic-crystal-based grating couplers for both low-loss fiber-to-chip coupling and on-chip suppression of generated spontaneous Raman scattering noise. We measure a minimum heralded second-order correlation of , demonstrating that our source operates in the single-photon regime with low noise.