ONLINE Halbleiter zum Frühstück - A quantum dot in a tunable microcavity as a fast and bright source of coherent single photons

Photons at optical frequencies can transfer quantum information over large distances – a source of single photons is a valuable resource. Described here is a semiconductor source of single photons. A single quantum dot is used as quantum emitter; an open microcavity is used to funnel the photons into a single optical mode. A record overall efficiency is achieved with this approach. Crucially, the coherence of the photons is maintained over streams of thousands of photons. The talk will describe the basics of quantum dots and cavity-QED along with the latest results.