Fiber coupled high count-rate single-photon generated from InAs quantum dots

Abstract In this work, we achieve high count-rate single-photon output in single-mode (SM) optical fiber. Epitaxial and dilute InAs/GaAs quantum dots (QDs) are embedded in a GaAs/AlGaAs distributed Bragg reflector (DBR) with a micro-pillar cavity, so as to improve their light emission extraction in the vertical direction, thereby enhancing the optical SM fiber’s collection capability (numerical aperture: 0.13). By tuning the temperature precisely to make the quantum dot exciton emission resonant to the micro-pillar cavity mode ( Q ~ 1800), we achieve a fiber-output single-photon count rate as high as 4.73 × 10 6 counts per second, with the second-order auto-correlation g 2 (0) remaining at 0.08.