McCuller develops quantum resources - squeezed light, non-Gaussian states (cat/GKP/photon-subtracted), and optomechanical amplifiers - to push interferometric measurement beyond the standard quantum limit; the group enabled LIGO's broadband frequency-dependent squeezing and is building integrated waveguide squeezers and quantum links for precision sensing. Actively recruiting students and postdocs. For context, this complements the established paradigm of NV-diamond ensemble magnetometry (Hahn-echo/DEER, nanoscale NMR, T1 relaxometry) operating near pT/√Hz sensitivity.