Advances in material processing are rapidly improving the quality and scalability of nitrogen-vacancy (NV) and group-IV vacancy (G4V) color centers in diamond—key building blocks for quantum sensing and photonic networks. Central challenges remain: precise control of defect-formation pathways and the mitigation of nearby charge traps and parasitic states, which is especially problematic for near-surface emitters. Recent progress in sample preparation and in-situ thermal treatments (before, during and after growth, and during implantation) have reduced nonradiative dark defects and suppressed interface doping. Optimizing thermal strategies have illustrated an increased conversion yield for NV and G4V centers, while limiting unwanted photoluminescence. Similarly, surface treatments play an imperative role in stabilizing near-surface charge states for sensing applications. Complementary ex-situ protocols, such as high-temperature vacuum anneals, and hybrid incorporation methods that combine shallow implantation with epitaxial overgrowth continue to improve yields and coherence for shallow NV and G4V centers. Together, these integrated strategies are enabling deterministic, high-fidelity quantum emitters embedded in scalable diamond nanostructures.
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