Phillip Murphy-Armando
Project CUSPIDOR: CMOS Compatible Single Photon Sources based on SiGe Quantum Dots
I will give an overview and early results on the materials development of the QuantERA project CUSPIDOR. This project will develop a novel integrated photonic platform relying on a fully CMOS-compatible technology, and provide compact and highly efficient sources of deterministic single photons at telecommunications wavelengths.
Using quantum electro-dynamics principles, silicon-germanium quantum dots (QDs) in silicon will be optimised for high radiative efficiency at temperatures up to 300K. Ion implantation will be implemented during growth, modifying the electron wave function and improving the radiative recombination rate. Optimal and deterministic coupling of the QDs with high quality-factor resonators will be achieved by site controlled QD growth in combination with precisely aligned, lithographically defined photonic crystal resonators, allowing upscaling and a straight forward implementation of areas of identical single photon sources. Combining these sources with lateral p-i-n diodes will yield electrically triggered single photon emitters. By using the QD to provide a strong optical nonlinearity, a single photon source (SPS) will be realized via the implementation of an on-chip photon blockade. Quantum interference in a photonic molecule increases the system’s sensitivity providing a practical path to the first integrated photon blockade device and provide opportunities for coherent protocols not possible with a single quantum dot.