  Integrated quantum photonic circuitry is an emerging topic that requires
efficient coupling of quantum light sources to waveguides and optical
resonators. So far, great effort has been devoted to engineering on-chip
systems from three-dimensional crystals such as diamond or gallium arsenide. In
this study, we demonstrate room temperature coupling of quantum emitters
embedded within a layered hexagonal boron nitride to an on-chip aluminium
nitride waveguide. We achieved 1.2% light coupling efficiency of the device and
realise transmission of single photons through the waveguide. Our results serve
as a foundation for the integration of layered materials with on-chip
components and for the realisation of integrated quantum photonic circuitry.
