Indistinguishable single photons from a quantum dot in a nanopost cavity
Résumé
Wavelength-tunable sources of single photons are key devices for scaling up optical quantum technologies. In this context, individual quantum dots (QDs) embedded in broadband photonic nanostructures are particularly appealing. The nanopost cavity, which is built with a segment of photonic wire, offers a rare combination of pronounced Purcell effect, large extraction efficiency and wide operational bandwidth. So far however, the emission of indistinguishable photons, a crucial feature for most envisioned applications, has not yet been reported with such devices. Here, we demonstrate the on-demand emission of indistinguishable single photons from a QD in a nanopost cavity. We implement a phonon-assisted quasi-resonant pulsed excitation and achieve an excellent singlephoton purity (g (2) (0) = 6×10 -3 ). Furthermore, Hong-Ou-Mandel interference reveals a wavepacket overlap as high as 0.45 between consecutive photons, which defines a new state-of-the-art among nanowire-based devices. These results mark an important milestone in the development of quantum light sources based on broadband nanopost cavities.
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