  The coupling between single photon emitters and integrated photonic circuits
is an emerging topic relevant for quantum information science and other
nanophotonic applications. We investigate the coupling between a hybrid system
of colloidal quantum dots and propagating gap modes of a silicon nitride
waveguide system. We furthermore explore the density of optical states of the
system by using a scanning probe technique and find that the quantum dots
couple significantly to the photonic circuit. Our results indicate that a
scalable slot-waveguide might serve as a promising platform in future
developments of integrated quantum circuitry.
