  Chiral light-matter interaction can lead to directional emission of two-level
light emitters in waveguides. This interesting physics effect has raised
considerable attention in recent years especially in terms of on-chip quantum
systems. In this context, our work focuses on tailoring single semiconductor
quantum dot-waveguide (QD-WG) systems to emit single photons with high
directionality. We use low-temperature in-situ electron-beam lithography
enabled by cathodoluminescence mapping to select suitable QDs and to integrate
them deterministically into linear waveguide structures at specific chiral
points determined by numerical calculations. We observe excitonic and
biexcitonic emission from the fabricated QD-WG structure in a confocal microPL
setup enabling the optical characterization in terms of directional emission of
circularly polarized photons emitted by integrated QDs. Our results show a high
degree of anisotropy on the level of 54% for directional QD emission and
antibunching in autocorrelation experiment confirming the fabricated QD-WG
system, which is a prerequisite for using this effect in advanced applications
in integrated quantum circuits.
