Schwab's group studies quantum limits of nanomechanical and electromechanical measurement, coupling mechanical resonators to superconducting circuits and qubits to explore back-action-evading measurement, ground-state control, and force/displacement sensing at the quantum limit. For context, this complements the established paradigm of NV-diamond ensemble magnetometry (Hahn-echo/DEER, nanoscale NMR, T1 relaxometry) operating near pT/√Hz sensitivity.