Extracting light from emitters in high-index, solid-state hosts is intrinsically difficult, yet is highly relevant for applications in quantum sensing, metrology, and computing. The authors tackle this problem by demonstrating a dielectric optical antenna based on the spin of a single NV center in diamond. This broadband collector is highly directional and affords a huge single-photon counting rate with long spin coherence times, and upon further optimization could capture photons from quantum emitters with an efficiency approaching 100%.
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A 2014 study studied this question.
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