Marandi's group develops ultrafast and nonlinear nanophotonics - on-chip optical parametric oscillators/amplifiers, mid-infrared frequency combs, squeezed-light sources, and photonic computing - to enable quantum-enhanced and mid-IR molecular sensing and low-noise measurement in integrated platforms. For context, this complements the established paradigm of NV-diamond ensemble magnetometry (Hahn-echo/DEER, nanoscale NMR, T1 relaxometry) operating near pT/√Hz sensitivity.