Figure | Scalable quantum photonic platform based on site-controlled quantum dots (SCQDs) integrated with circular Bragg grating (CBG) resonators. (IMAGE)
Caption
Figure | Scalable quantum photonic platform based on site-controlled quantum dots (SCQDs) integrated with circular Bragg grating (CBG) resonators. (a) Artistic illustration of a wafer-scale SCQD-CBG array, where emitters are deterministically positioned at the centers of the resonators and emit vertically directed single-photons. The schematic highlights the scalable architecture and efficient vertical photon extraction enabled by the resonator design. (b) Low-temperature cathodoluminescence maps of the fabricated 6×6 SCQD-CBG device array overlaid with the corresponding SEM image. Bright emission is confined to the CBG-mesa centers for all devices, demonstrating deterministic QD growth, uniform fabrication, and 100% integration yield across the array. (c) Representative optical and quantum-optical characterization of the best-performing SCQD-CBG device. Top: high-resolution micro-photoluminescence spectra showing spectrally isolated emission with narrow linewidths. Middle: second-order autocorrelation measurement confirming a single-photon purity of 99.6%. Bottom: Hong-Ou-Mandel two-photon interference histogram revealing a raw visibility of 81%. Together, these results establish the SCQD-CBG platform as a scalable, high-performance semiconductor quantum light source architecture.
Credit
Kartik Gaur et al.
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CC BY