Speaker: Clara Henke
Affiliation: Center for Hybrid Quantum Networks (Hy-Q), Denmark
Date: Tuesday, 7 July 2026 at 12:00
Location: Online seminar
Radiative coupling between quantum emitters leads to a range of spectacular emission phenomena such as super- and subradiance. Waveguide quantum electrodynamics (QED) allows the coupling of spatially separated emitters, while preserving individual addressability. I will present our work with a pair of independently tunable solid-state quantum dots (QDs) embedded in a bidirectional photonic crystal waveguide. Remarkably, the emitters are separated over 13 µm – 26 effective wavelengths – yet remain radiatively coupled. Coherent coupling induces energy shifts of the collective states, forming an artificial molecule. By manipulating the relative driving phase when exciting the QDs simultaneously, we switch the emission direction from predominantly towards the left to the right. In addition, we observe direction-dependent photon statistics with single-photon emission to the left and photon-pair emission to the right. Our results realize a novel implementation of chiral quantum optics with waveguide-coupled quantum dots and represent an important step toward scalable multi-emitter waveguide QED platforms.