  Ensembles of nitrogen-vacancy (NV) centers in diamond are a leading platform
for practical quantum sensors. Reproducible and scalable fabrication of
NV-ensembles with desired properties is crucial. This work addresses these
challenges by developing a chemical vapor deposition (CVD) synthesis process to
produce diamond material at scale with improved NV-ensemble properties for a
target NV density. The material reported in this work enables immediate
sensitivity improvements for current devices. In addition, techniques
established in this work for material and sensor characterization at different
stages of the CVD synthesis process provide metrics for future efforts
targeting other NV densities or sample geometries.
