InAs/GaAs Quantum Dot Embedded Tapered Nanobeam Cavity for Single Photon Emission

Semiconductor quantum dots serve as ideal single-photon sources due to their purity and indistinguishability, making them valuable for generating entangled photons in photonic quantum computing. By coupling a quantum dot to a photonic cavity, it is possible to create an interface between a single photon and a single spin for quantum information processing. We demonstrate a nanobeam photonic crystal cavity integrated with InAs/GaAs Quantum Dot with a purcell enhancement of 12. We achieved a nanobeam-to-fiber coupling efficiency of 44%. The QDs are embedded in a p-i-n-i-n diode structure, making the dots charge-tunable and an efficient source of single photons. To characterize the emission from the dots, we measured second-order correlation and obtained a g2(0)<0.1. This nanobeam cavity with a quantum dot acts as a single photon source and an efficient interface spin-photon interaction.