Scalable photonic quantum information technologies require a platform combining quantum light sources, waveguides, and detectors on a single chip. Here, we introduce a van der Waals platform comprising strain-engineered bilayer WSe2 quantum emitters, integrated on multimode WS2 waveguides with optimized grating couplers, enabling efficient on-chip quantum light sources. The emitters exhibit bright, highly polarized emission that couples efficiently into WS2 waveguides. Under resonant p-shell excitation, we observe high-purity, waveguide-coupled single-photon emission, measured using both an off-chip Hanbury Brown-Twiss configuration (g(2)(0)=0.003−0.003+0.030) and an on-chip configuration (g(2)(0)=0.076±0.023). For a single output, the out-coupled single-photon count rate at the first lens reaches approximately 320 kHz under continuous-wave p-shell excitation, corresponding to an estimated waveguide-coupled rate of 1.7 MHz. These results demonstrate an efficient, integrated single-photon source and establish a pathway toward scalable photonic quantum information processing centered around nanoengineered van der Waals materials.
@article{arxiv.2512.15337,
title = {Integrated on-chip quantum light sources on a van der Waals platform},
author = {Pietro Metuh and Paweł Wyborski and Athanasios Paralikis and Frederik Schröder and Nicolas Stenger and Niels Gregersen and Battulga Munkhbat},
journal= {arXiv preprint arXiv:2512.15337},
year = {2025}
}