Berengut works on the atomic structure theory underpinning next-generation clocks: highly charged ions, whose optical transitions are both extremely narrow and exceptionally sensitive to variation of fundamental constants and to new physics, and the thorium-229 nuclear clock. He identifies which ionic species and transitions maximise sensitivity to the physics of interest while remaining experimentally accessible, and computes the many-body structure needed to interpret them — work that has directly guided the experimental HCI clock programmes at PTB, MPIK and NIST. 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 — clocks and magnetometers are the two great classes of quantum sensor; his work is on the frequency side of the same estimation problem that fixes pT/sqrt(Hz) performance on the magnetic side. Theory PI with close experimental collaborations.
Chantler's group is built around the idea that X-ray measurements can be made accurate, not just precise: the X-ray Extended Range Technique (XERT) delivers absolute absorption coefficients at the 0.02 per cent level, which in turn allows XAFS to be used for quantitative structure determination and allows high-accuracy tests of atomic theory. The second thread is precision X-ray spectroscopy of highly charged ions and exotic atoms as a test of bound-state QED, where discrepancies between theory and experiment remain unresolved. 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 — this is precision measurement at the other end of the electromagnetic spectrum: the methodological common ground with pT/sqrt(Hz) NV ensemble sensing is the obsessive treatment of systematics and absolute calibration that separates a sensitive measurement from an accurate one. Borderline inclusion, kept because the group's core competency is metrology rather than X-ray applications.
Cheuk laser-cools and traps individual laser-coolable molecules (e.g. CaF) in optical tweezer arrays, achieving high-fidelity non-destructive imaging, Raman sideband cooling, and on-demand entanglement of molecular qubits, with explicit applications to quantum simulation, quantum information processing, and quantum-enhanced sensing/precision measurement. The rich internal structure of molecules gives access to new sensing modalities (e.g. searches for new physics) that complement atom-based quantum sensors.
Experimental AMO physicist using ultracold atoms and optical lattices for quantum simulation and sensing. Directions: (1) Efimov and few-body physics in ultracold Cs and Cs-Li mixtures; (2) quantum phase transitions and strongly correlated quantum matter in optical lattices; (3) optical tweezer arrays for single-atom and single-molecule quantum simulation. Develops novel imaging techniques for in-situ atomic density measurements.
Nobel laureate Steven Chu's group spans laser cooling/trapping of atoms and single-molecule biophysics, using optical and magnetic tweezers and single-molecule fluorescence to study DNA/RNA folding, molecular motors, and signal transduction -- one of the earliest applications of AMO-derived single-particle measurement precision to living systems.
Experimental AMO physicist focused on precision measurement for fundamental physics. Primary directions: (1) ACME experiment measuring electron electric dipole moment to unprecedented precision using ThO molecular beam — tests for new CP-violating physics beyond the Standard Model; (2) ultracold polar molecule quantum simulation and quantum information in optical tweezers. Atomic coherence techniques underpin SERF/OPM magnetometry. Joined UChicago from Yale 2022.
Doyle's group laser-cools and traps polyatomic and diatomic molecules (including CaF and YbOH) using cryogenic buffer-gas sources, applying them to precision tests of fundamental physics such as the electron electric dipole moment (ACME-style eEDM measurement) and to molecule-based quantum information. This precision-measurement approach to fundamental-symmetry tests is a borderline but included case under the quantum-sensing umbrella, given its shared cold-molecule-platform lineage with atomic/vapor sensing and inertial-sensing work.
Fan is a junior faculty member specializing in searches for physics beyond the Standard Model through precision measurements using ion traps and molecules. Included as a borderline quantum-sensing/precision-measurement case, analogous to eEDM-style molecular and ion-trap metrology elsewhere in the department.
Flambaum is one of the most cited atomic theorists alive and the intellectual source of a large fraction of the modern precision-AMO new-physics programme. His group computes the atomic and molecular structure factors that convert an experimental frequency shift into a bound on new physics: enhancement factors for electron and nuclear EDMs, atomic parity violation, the sensitivity of clock transitions to variation of the fine-structure constant, and — most relevant to quantum sensing — the response of atomic clocks, magnetometers and comagnetometers to ultralight/axion-like dark matter fields. He proposed much of the theory behind using networks of quantum sensors as dark matter detectors. 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 — his theory is what tells an experimentalist what a pT/sqrt(Hz) magnetometer or a 10^-18 clock actually constrains: without it, a spin-precession measurement is just a number. Theory group; a sensing postdoc would collaborate rather than join.
NON-PREFERRED (borderline precision-measurement pivot, kept for review). Garcia Ruiz develops precision laser spectroscopy of atoms and molecules built from short-lived radioactive nuclei (at CERN-ISOLDE and the new FRIB facility) to measure nuclear charge radii, moments, and to search for symmetry-violating effects (parity/time-reversal violation) analogous to eEDM searches; it is fundamental precision measurement rather than a deployable quantum sensor, but shares techniques and motivation with the eEDM/precision-AMO quantum-sensing cluster.