High Purcell-enhancement in quantum-dot hybrid circular Bragg grating cavities for GHz-clockrate generation of indistinguishable photons

Abstract

We present Purcell-enhanced ($F_{\mathrm{P}}>25$) semiconductor InAs quantum dot decay times of $T_1<30$ps, enabled by deterministic hybrid circular Bragg gratings (hCBGs). We investigate the benefits of these short $T_1$ times on the two-photon indistinguishability for quasi-resonant and strictly resonant excitation, and observe visibilities $\ge 96\%$ 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.

14 pages (+11 pages in Supplementary Information, 5 figures (+11 figures in Supplementary Information), 64 references

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