Novotny leads the Photonics Lab with a primary focus on levitodynamics. Research directions: (1) Ground-state cooling of levitated nanoparticles — demonstrated quantum control and motional ground state cooling of silica nanospheres in cryogenic free space (Nature 2021) and all 6 degrees of freedom simultaneously via coherent scattering (Nature Physics 2023); (2) Quantum delocalization and matter-wave interference of levitated nanoparticles (arXiv 2408.01264, 2024); (3) Cavity-mediated long-range interactions between multiple levitated nanoparticles, enabling collective quantum sensing arrays; (4) Optical cold damping, measurement-free coherent feedback (PRL 2025); (5) 2D optoelectronics — graphene/hBN/TMD-based laser detectors and modulators. Heavily cited levitodynamics review (Science 2021, joint with Quidant). Group feeds into applications in quantum-limited force sensing and macroscopic quantum tests.

O'Hare is a dark-matter phenomenologist whose work sits unusually close to instrumentation: he is the principal theorist of the 'neutrino fog' that limits direct-detection experiments, of directional dark matter detection (using the daily modulation of the WIMP wind to distinguish signal from background), and of the axion and ultralight dark-matter searches that increasingly rely on quantum sensors — haloscopes, comagnetometers, NMR-based searches and atomic magnetometers. He writes the sensitivity projections that tell experimentalists which quantum sensor to build. Positioned against the established body of NV-ensemble quantum sensing work — DEER, nanoscale NMR and T1 relaxometry protocols operating at pT/sqrt(Hz) field sensitivity — the axion/ALP search programme he works on consumes spin-ensemble magnetometry directly: CASPEr-class experiments are, in effect, precision NMR magnetometers operating far below pT/sqrt(Hz), and his phenomenology sets the sensitivity targets they aim at. Theory PI with strong experimental engagement.

Oberlack leads Mainz's contribution to the XENON/XENONnT dual-phase liquid-xenon dark-matter programme at Gran Sasso, covering detector instrumentation, ultra-low-background material screening, light and charge readout, and the associated rare-event analysis; the same detectors also probe neutrinoless double beta decay and coherent neutrino scattering. Relative to the established NV-ensemble quantum-sensing playbook (DEER, nanoscale NMR, T1 relaxometry at pT/sqrt(Hz) ensemble sensitivity), this is an astro-particle pivot: the shared discipline is single-quantum detection at absurd background rejection, and the group is a natural landing spot for a quantum-sensing postdoc interested in low-background readout electronics or in the growing overlap between quantum sensors and dark-matter searches.

The Odom Group studies trapped molecular ions at millikelvin temperatures using radio-frequency ion traps. Key directions: (1) Controlled preparation and single-quantum-state readout of trapped molecular ions (e.g., AlH⁺, SiO⁺, N₂⁺) — combining laser cooling, blackbody-radiation-assisted state preparation, and fluorescence detection for single-molecule precision spectroscopy; (2) Search for time-variation of fundamental constants (electron-to-proton mass ratio, fine structure constant α) using molecular vibrational/rotational transitions as highly sensitive probes; (3) Quantum effects in sub-Kelvin chemistry — probing tunneling, orbiting resonances, and quantum state control of reactive collisions between cold molecules. Member of CFP Northwestern.

Oppenheim developed a 'postquantum theory of classical gravity' in which spacetime remains fundamentally classical while quantum theory itself is modified, predicting stochastic fluctuations in spacetime that would manifest as an unpredictable, diffusive fluctuation in the measured weight of a precisely-monitored mass. He has proposed and is pursuing precision-mass experiments to test this prediction against the alternative (Bose-Marletto-Vedral-style) entanglement-witness route to probing the quantum nature of gravity, offering a theoretically distinct but experimentally complementary approach within UCL's quantum-gravity-sensing programme.

Otte's group pioneered electron-spin-resonance scanning tunneling microscopy (ESR-STM), positioning individual atoms one-by-one with a low-temperature STM tip and using all-electrical RF driving to coherently control and single-shot read out individual electron and nuclear spins (e.g., single 49Ti nuclei) with sub-neV energy resolution and atomic spatial resolution. Where NV-ensemble sensing reaches pT/sqrt(Hz) at the nanoscale, Otte's ESR-STM instead reaches the ultimate single-atom limit of magnetic sensing and quantum control, and the lab is developing a next-generation 15 T / 20 mK STM to push coherence times and energy resolution further.

Bruce (Jun-Yu) Ou's group applies nanomechanics and nanophotonics to quantum sensor manipulation and AI hardware. Research: (1) ultracompact nanomechanical imaging optics for quantum sensor readout; (2) energy-efficient photonic AI hardware; (3) nanomechanical resonators for force sensing at the quantum limit; (4) nanophotonic interfaces to quantum sensors. Relevant to quantum sensor miniaturisation and readout.

Ruth Oulton's group works on quantum photonics using solid-state single-photon emitters. Research: (1) semiconductor quantum dot single-photon sources — cavity-enhanced emission, photonic crystal integration; (2) hBN defect spin-photon interfaces; (3) integrated quantum photonics for sensing and quantum networks. The group focuses on device-quality semiconductor photonic systems for quantum information and sensing applications.

Stefano Paesani works on photonic quantum information processing and quantum sensing. Research: (1) silicon quantum photonic integrated circuits for quantum computing and measurement; (2) boson sampling and quantum advantage with photons; (3) quantum sensing using photonic cluster states. Recently joined Lodahl group at NBI as associate professor.

Painter's group pioneers cavity- and phononic-crystal optomechanics for quantum-limited displacement and force sensing, ground-state cooling, phononic quantum circuits, and microwave-to-optical transduction linking superconducting qubits to optical photons. For context, this complements the established paradigm of NV-diamond ensemble magnetometry (Hahn-echo/DEER, nanoscale NMR, T1 relaxometry) operating near pT/√Hz sensitivity.