Nanodiamonds placed in hybrid bullseye nanoantennas emit photons into single direction, achieving 80% efficiency at room temperature

https://www.sciencedaily.com/releases/2025/10/251007081833.htm

"single photon streams carry quantum information for quantum technologies, but much of this light is lost in all directions... overcome by producing this light stream by placing, within a few billionths of a meter, nanodiamonds containing defects (nitrogen-vacancy centers) exactly at the center of hybrid nanoantennas that are built from layers of metal and dielectric materials in precise bullseye pattern, guiding light in well-defined direction instead of letting it scatter... faster, more reliable, chip-based quantum networks"

Related: Nanodiamonds and beyond: Designing carbon materials with AI at exascale
https://phys.org/news/2026-03-nanodiamonds-carbon-materials-ai-exascale.html#google_vignette