On-chip generation and guiding of quantum light from a site-controlled   quantum dot
  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. 
Ayesha Jamil, Joanna Skiba-Szymanska, Sokratis Kalliakos, Andre   Schwagmann, Martin B. Ward, Yarden Brody, David J. P. Elli...
physics.optics