Deterministic quantum photonics with ordered systems of quantum wires and quantum dots

We describe an approach for preparing systems of semiconductor quantum wires (QWRs) or quantum dots (QDs) with perfect site control combined with good spectral control and high optical emission efficiency, for applications in deterministic quantum photonics. The approach is based on organometallic vapour phase epitaxy on patterned, nonplanar substrates, through which the QWRs/QDs are self-formed in V-groove channels or pyramidal pits. Excellent uniformity (inhomogeneous broadening as low as ~1 meV), tailored heterostructure potential, efficient emission of single and entangled photons, and integrability with photonic crystal (PhC) cavities are demonstrated. Applications in QWR-PhC nanolasers and coupling of a measurable number of QDs with PhC nanocavity modes are implemented and discussed.