Abstract
We present Purcell-enhanced (FP>25) semiconductor InAs quantum dot decay times of T₁<30ps, enabled by deterministic hybrid circular Bragg gratings (hCBGs). We investigate the benefits of these short T₁ times on the two-photon indistinguishability for quasi-resonant and strictly resonant excitation, and observe visibilities ≥96% at 12.5ns time delay of consecutively emitted photons. The strongly Purcell-enhanced decay times enable a high degree of indistinguishability for elevated temperatures of up to 30K, and moreover, allow for excitation of up to 1.28GHz repetition rate. Our work highlights the prospects of high Purcell-enhanced solid-state quantum emitters for applications in quantum information and technologies operating at GHz clock-rates.