Charged quantum dot micropillar system for deterministic light-matter interactions
Petros Androvitsaneas, A. B. Young, C. Schneider, Stefan Alexander Maier, Martin Kamp, Sven Höfling, Sebastian Knauer, Edmund Harbord, C. Y. Hu, John G. Rarity, Rupert F. Oulton · Physical review. B./Physical review. B · 2016
Quantum dots have long been considered systems that could deliver a significant advantage for practical quantum information applications. Their atomic dipolelike transitions and their compatibility to be integrated into a variety of photonic structures has highlighted this fact. Here, the authors measure an unexpectedly high single-photon level phase shift (~6${}^{\ensuremath{\circ}}$), induced upon reflection from a singly negatively charged quantum dot incorporated in a low-$Q$-factor cavity ($Q$~290). This measurement provides the first evidence for a system with unit fidelity and a high efficiency in its interactions. The result opens a new road to realistic spin-photon entanglement devices, in a simple and easy to fabricate photonic structure.