Ahmed develops cryogenic TES bolometer arrays and SQUID multiplexing readout for next-generation CMB polarization instruments (CMB-S4 and predecessors), working at the intersection of quantum-limited detector physics and observational cosmology.

Develops cryogenic detector technology for CMB experiments. Directions: (1) TES bolometer array design and fabrication for SPT-3G and CMB-S4; (2) MKID detector development as alternative to TES for next-generation CMB focal planes; (3) low-noise SQUID multiplexed readout for large-format arrays; (4) SPT-3G science: CMB lensing, cluster SZ, B-mode polarization. Argonne joint appointment.

Develops superconducting detector and readout systems for CMB observations. Directions: (1) SQUID-multiplexed readout architecture for large TES bolometer arrays (SPT-3G, CMB-S4); (2) transition-edge sensor bolometer fabrication and characterization; (3) MKID detector development; (4) CMB-S4 instrument design. Argonne joint appointment. Deep expertise in quantum-limited cryogenic detector readout.

Irwin invented the transition-edge sensor (TES) and pioneered SQUID-multiplexed readout now used throughout CMB and dark-matter detector arrays; his group builds quantum-limited electromagnetic sensors for axion dark matter searches (DMRadio) and cryogenic calorimeters, pushing sensitivity to the standard quantum limit and beyond -- a field of quantum sensing that, like ensemble NV-diamond magnetometry reaching pT/√Hz sensitivities, trades off bandwidth and volume for extreme field sensitivity.

Jones leads the SPIDER balloon-borne CMB polarimeter (and the successor Taurus mission), building and flying large TES bolometer arrays from Antarctic long-duration balloon platforms to measure degree-scale CMB polarization with minimal atmospheric loading, and also leads SuperBIT, a near-diffraction-limited stratospheric optical telescope. Like Staggs, he is included here as an astronomy/instrumentation pivot whose science case rests on cutting-edge cryogenic detector-array sensitivity.

Kuo develops and deploys TES bolometer arrays and SQUID-multiplexed readout electronics for cosmic microwave background polarization experiments (BICEP/Keck, South Pole Telescope, CMB-S4), pairing quantum-limited cryogenic sensor design with cosmology to search for inflationary gravitational-wave signatures.

Lee designs and builds large-format TES bolometer arrays and their SQUID-multiplexed cryogenic readout electronics for the South Pole Telescope and CMB-S4, working to push per-detector noise toward the fundamental photon-noise limit for next-generation cosmic microwave background polarization surveys.

Develops cryogenic microcalorimeter/TES-based X-ray and far-infrared detector arrays used in X-ray astronomy and CMB instrumentation.

Experimental cosmologist developing next-generation CMB detector arrays. Directions: (1) CMB-S4 detector development — leading TES bolometer and MKID array design for 500,000-detector focal plane; (2) South Pole Telescope SPT-3G operations and analysis; (3) cryogenic readout electronics including SQUID multiplexing at millikelvin temperatures; (4) quantum-limited photon detection at mm/submm wavelengths. APS Fellow.

Reichardt leads Melbourne's CMB effort and is a member of SPT-3G, the third-generation South Pole Telescope camera, whose focal plane is populated by ~16,000 transition-edge sensor bolometers read out by SQUID multiplexers. His science targets are CMB lensing, the Sunyaev-Zel'dovich effect and the small-scale temperature and polarisation power spectra; the enabling technology is cryogenic quantum-limited detection. 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 the astronomical analogue of the same problem — a detector whose noise floor is set by fundamental quantum limits rather than by the source — and TES/SQUID readout is a natural pivot for a physicist trained on pT/sqrt(Hz) magnetometry, since SQUID amplification is the shared hardware. Preferred attribute present: astronomy where the quantum sensor is the enabling technology.