  We demonstrate the emission and routing of single photons along a
semiconductor chip originating from carrier recombination in an actively
positioned InAs quantum dot. Device scale arrays of quantum dots are formed by
a two step regrowth process. We precisely locate the propagating region of a
unidirectional photonic crystal waveguide with respect to the quantum dot
nucleation site. Under pulsed optical excitation, the multiphoton emission
probability from the exit of the waveguide is 12 \pm 5 % before any background
correction. Our results are a major step towards the deterministic integration
of a quantum emitter with the waveguiding components of photonic quantum
circuits.
