title: Bright single-photon sources in bottom-up tailored nanowires.
abstract: The ability to achieve near-unity light-extraction efficiency is necessary for a truly deterministic single-photon source. The most promising method to reach such high efficiencies is based on embedding single-photon emitters in tapered photonic waveguides defined by top-down etching techniques. However, light-extraction efficiencies in current top-down approaches are limited by fabrication imperfections and etching-induced defects. The efficiency is further tempered by randomly positioned off-axis quantum emitters. Here we present perfectly positioned single quantum dots on the axis of a tailored nanowire waveguide using bottom-up growth. In comparison to quantum dots in nanowires without waveguides, we demonstrate a 24-fold enhancement in the single-photon flux, corresponding to a light-extraction efficiency of 42%. Such high efficiencies in one-dimensional nanowires are promising to transfer quantum information over large distances between remote stationary qubits using flying qubits within the same nanowire p-n junction.
authors.affiliation: Kavli Institute of Nanoscience, Delft University of Technology, 2600 GA Delft, The Netherlands. m.e.reimer@tudelft.nl
authors.forename: Michael E
authors.initials: ME
authors.lastname: Reimer
authors.forename: Gabriele
authors.initials: G
authors.lastname: Bulgarini
authors.forename: Nika
authors.initials: N
authors.lastname: Akopian
authors.forename: Moïra
authors.initials: M
authors.lastname: Hocevar
authors.forename: Maaike Bouwes
authors.initials: MB
authors.lastname: Bavinck
authors.forename: Marcel A
authors.initials: MA
authors.lastname: Verheijen
authors.forename: Erik P A M
authors.initials: EP
authors.lastname: Bakkers
authors.forename: Leo P
authors.initials: LP
authors.lastname: Kouwenhoven
authors.forename: Val
authors.initials: V
authors.lastname: Zwiller