Cavity Quantum Electrodynamics with Single Quantum Dots in Microcavities

Several proposals for solid-state cavity quantum electrodynamics rely on a strong interaction between the cavity mode and an embedded single atom or a single quantum dot (QD). In order to achieve a strong light-matter interaction, the cavity must have a small mode volume while maintaining a large quality factor. To this end, InAs/GaAs QDs in GaAs-based microcavities have been investigated using micro-photoluminescence spectroscopy and photon statistics measurements. Individual QDs in these devices have been identified by their photon anti-bunching signatures. Pronounced enhancement of the single QD lifetime has been measured, with some lifetimes limited by the detector resolution (200 ps), corresponding to a Purcell factor of more than 10. Together with active spatial positioning schemes of QDs, these devices are promising avenues to reach the strong coupling regime with individual solid state emitters.