Chiral Quantum Optics with Scalable Quantum Dot Dimers
Abstract
We present a scalable method for electrically tuning multiple spatially separated quantum dots 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 isolation between adjacent regions. Unlike physical etching, this method preserves the guided-mode profile of the photonic crystal without introducing significant scattering, limiting refractive index perturbations to below 0.001 with 0.01% additional loss. In contrast, physical etching can reduce single-band transmission by more than 30% for an etch width of 100 nm. We demonstrate the applicability of our approach using quantum dots embedded in a glideplane photonic crystal waveguide, controlling the detuning between different spin-state combinations of two highly chiral quantum dots 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.
Cite
@article{arxiv.2511.07640,
title = {Chiral Quantum Optics with Scalable Quantum Dot Dimers},
author = {L. Hallacy and D. Hallett and A. Fenzl and N. J. Martin and R. Dost and A. Verma and J. Fletcher and I. Farrer and L. Antwis and M. S. Skolnick and L. R. Wilson},
journal= {arXiv preprint arXiv:2511.07640},
year = {2025}
}