Colloidal quantum dots (QDs) are excellent candidates for applications as single-photon sources and building blocks for scalable integrated quantum nanophotonic systems when coupled with optical cavities. However, there are many challenges including inhomogeneous broadening, random positioning, and high dephasing rates that hinder the deployment of these solution-processed materials in quantum information science and engineering. With a combination of synthetic and fabrication strategies, we introduce an approach for improving integrated nanophotonics using colloidal QDs. First, we examine the optical properties of giant QDs shelled with silica with different core compositions including CdSe/CdS, CdSe/ZnS, and CdSe/CdS/ZnS and silica shell thicknesses. Without any post-synthetic treatment, the giant QDs show a high thermal- and photo-stability, blinking suppression behavior, and single-photon emission with zero time delay g<sup>(2)</sup>(0) below 0.4 at room temperature. The giant QDs are then deposited on different nanostructures and show a high degree of dispersion of single particles and deterministic placements. These observations indicate that shelling QDs in silica holds promise to play an important role in the development of integrated quantum nanophotonics.

Strategies for improving integrated quantum nanophotonics using silica-shelled quantum dots

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