  Developing future quantum communication may rely on the ability to engineer
cavity-mediated interactions between photons and solid-state artificial atoms,
in a deterministic way. Here, we report a set of technological and experimental
developments for the deterministic coupling between the optical mode of a
micropillar cavity and a quantum dot trion transition. We first identify a
charged transition through in-plane magnetic field spectroscopy, and then tune
the optical cavity mode to its energy via in-situ lithography. In addition, we
design an asymmetric tunneling barrier to allow the optical trapping of the
charge, assisted by a quasi-resonant pumping scheme, in order to control its
occupation probability. We evaluate the generation of a positively-charged
quantum dot through second order auto-correlation measurements of its resonance
fluorescence, and the quality of light-matter interaction for these spin-photon
interfaces is assessed by measuring the performance of the device as a
single-photon source.
