Vahala's group develops ultrahigh-Q optical microresonators and chip-scale soliton frequency microcombs for precision metrology, optical clocks, gyroscopes, LiDAR/ranging, and low-noise microwave generation, translating benchtop frequency-comb capability to integrated devices. For context, this complements the established paradigm of NV-diamond ensemble magnetometry (Hahn-echo/DEER, nanoscale NMR, T1 relaxometry) operating near pT/√Hz sensitivity.