Chiral quantum optics with scalable quantum dot dimers

Abstract

Abstract We present a scalable method for electrically tuning multiple spatially separated quantum dots (QDs) embedded in photonic crystal waveguides. Ion implantation into the top p-doped layer of a p-i-n diode creates high-resistivity tracks, providing electrical separation between adjacent regions. This method preserves the guided-mode profile of the waveguide, minimising backscatter and loss, enabling the observation of highly directional emission from two individually addressable QDs coupled to a glide-plane photonic crystal waveguide. We demonstrate control of the detuning between the QDs, enabling measurements of different indistinguishable spin-state combinations of two highly directional QDs coupled to the same mode. Second-order photon correlation measurements provide a sensitive probe of the chirality-dependent photon statistics, which are in good agreement with a waveguide-QED master equation model. Our results mark an important step towards scalable, multi-emitter architectures for chiral quantum networks.