Ultrafast Non-Classical Light Sources Based on Single InAs/GaAs Quantum Dot Embedded in a Hybrid Plasmonic Nanopillar Cavity

Semiconductor quantum dots (QDs) have been extensively researched and have attracted a lot of attention for their ability to deterministically generate single and entangled photons. Such solid-state non-classical light sources are implemented, for example, in quantum key distribution protocols and in on-chip linear optical quantum computing. One of the key practical requirements from these sources is for them to emit at a high repetition rate and a common solution is to embed the QDs in a photonic cavity that enhances the spontaneous emission rate of quantum emitters via the Purcell effect $\mathrm{F}_{\mathrm{p}}\sim \mathrm{Q}/\mathrm{V}$ , where Q is the cavity quality factor and V the mode volume. Typically, moderate/high-Q cavities are used for enabling Purcell enhancement of the QD emission. [1–3]