Efficient light-matter interaction at the single-photon level is of fundamental importance in emerging photonic quantum technology. A fundamental challenge is addressing multiple quantum emitters at once, as intrinsic inhomogeneities of solid-state platforms require individual tuning of each emitter. We present the realization of two semiconductor quantum dot emitters that are efficiently coupled to a photonic-crystal waveguide and individually controllable by applying a local electric Stark field. We present resonant transmission and fluorescence spectra in order to probe the coupling of the two emitters to the waveguide. We exploit the single-photon stream from one quantum dot to perform spectroscopy on the second quantum dot positioned 16μm away in the waveguide. Furthermore, power-dependent resonant transmission measurements reveals signatures of coherent coupling between the emitters. Our work provides a scalable route to realizing multi-emitter collective coupling, which has inherently been missing for solid-state deterministic photon emitters.
@article{arxiv.2303.00345,
title = {Independent electrical control of two quantum dots coupled through a photonic-crystal waveguide},
author = {Xiao-Liu Chu and Camille Papon and Nikolai Bart and Andreas D. Wieck and Arne Ludwig and Leonardo Midolo and Nir Rotenberg and Peter Lodahl},
journal= {arXiv preprint arXiv:2303.00345},
year = {2023}
}