Miller develops nitrogen-vacancy nanodiamond quantum biosensors for rapid diagnostics, controlling the NV spin state with resonant green/microwave illumination to frequency-separate fluorescence signal from background and achieve single-molecule detection of nucleic acids (e.g. HIV RNA with a short isothermal amplification step) in lateral-flow and widefield formats. His current projects span nanodiamond sensors for point-of-care disease diagnostics, quantum sensing at neural-interface implants, and wide-field quantum sensing of large randomly-oriented nanodiamond ensembles in biological samples, actively recruiting PhD students through the Q-BIOMED hub.