Demsar's group studies non-equilibrium dynamics in quantum materials with ultrafast optical and terahertz probes: THz time-domain spectroscopy, optical pump-probe and time-resolved photoemission applied to superconductors, charge-density-wave systems and magnetic materials, including light-induced phase transitions and the dynamics of collective modes. Relative to the established NV-ensemble quantum-sensing playbook (DEER, nanoscale NMR, T1 relaxometry at pT/sqrt(Hz) ensemble sensitivity), this is a borderline inclusion -- it is not quantum sensing per se -- but it is kept because the group's core competence is pushing temporal resolution (fs) and coherent THz detection to their limits, which is a legitimate adjacent skill set and a plausible pivot for someone with lock-in/pulsed-measurement expertise.

Faist is the inventor of the quantum cascade laser (QCL, 1994 at Bell Labs) and leads the Quantum Optoelectronics Group at ETH. Research directions: (1) QCL frequency combs — ring QCLs demonstrate dissipative Kerr solitons in the THz (Science Advances 2023), key for broadband integrated mid-IR spectrometers; (2) Dual-comb spectroscopy — two co-integrated ring QCLs for ultrafast molecular fingerprinting; (3) Quantum cascade detectors — strain-compensated InGaAs/InAlAs QCDs for short-wave mid-IR (<4 µm) sensing; (4) THz strong-coupling — ultrastrongly coupled 2DEG in cavities for quantum photonics; (5) Astrophysical heterodyne receivers — double-metal QCL Josephson mixers. Spin-off: IRsweep (mid-IR dual-comb systems) and Alpes Lasers (QCL commercialisation). FIRST Center head at ETH.

Galland leads LQNO at EPFL investigating light-matter interactions in nano-structures and the quantum regime. Research directions: (1) NV centers in diamond for quantum sensing — spectroscopy of NV spin states in ultra-thin diamond membranes, development of diamond nanophotonic platforms for enhanced sensing sensitivity; collaboration on quantum sensing with color centers; (2) Plasmonic nanocavities — few-nm gap junctions enhance Raman scattering by ×10^9, enabling single-molecule vibrational spectroscopy and coherent control; ultrafast and single-photon detection of coherent phonon dynamics; (3) 2D heterostructure photonics — entangled photon pair generation enhanced by TMD heterostructures; valley-polarized exciton sources; (4) Optical frequency conversion for quantum applications. SNSF-funded professor, internationally recognized for molecular optomechanics and carbon nanotube quantum optics.

Gangloff leads the Quantum Engineering Group at the Cavendish. Research spans three platforms: (1) Semiconductor quantum dots (InGaAs, GaAs) — demonstrating optical coherent control of quantum-dot nuclear spin ensembles (magnons, time crystals, many-body quantum registers); developing QD-based quantum repeater nodes (MEEDGARD QuantERA project); (2) Diamond group-IV spin defects (SiV, SnV, GeV) — precision positioning and high-purity single-photon generation from tin-vacancy centers; (3) Rydberg excitons in Cu₂O — exploring blockade-based optical quantum gates. The Integrated Quantum Networks Hub co-PI role underpins a broader quantum internet vision.

Gigan leads the Optical Imaging group at LKB, pioneering wavefront shaping and computational imaging through scattering media. Research directions: (1) Wavefront shaping / transmission matrix — measuring the ~10^5 optical modes of a scattering sample's transmission matrix to focus and image through highly scattering biological tissues; roadmap on deep tissue imaging (J. Phys. Photonics 2022, lead author); (2) Multimode quantum optics through complex media — spatially multimode squeezed states transmitted through scattering media for quantum-enhanced imaging; (3) Optical computing / AI — using multiple scattering as a physical neural network for reservoir computing and nonlinear machine learning (LightOn spin-off, 2016); (4) Neurophotonics applications — focusing through the skull for deep brain imaging. Two ERC grants (2011, 2017). Optica Fellow. IUF member (2016–2021).

Glorieux leads the Quantum Fluids of Light and Nanophotonics group at LKB. Research directions: (1) Quantum fluids of light in atomic vapors — hot Rb/Cs vapor as paraxial photon fluids exhibiting superfluidity, soliton dynamics, and vortex formation; first analogue cosmological particle creation (Hawking effect) in a photon fluid (Nature Communications 2022); (2) Polariton superfluids — exciton-polariton microcavities for analogue gravity, Bogoliubov dispersion mapping, and first-order dissipative phase transitions; (3) Nanophotonics — coupling single quantum emitters (nanofiber-coupled atoms, perovskite nanocrystals) for quantum photonics and sensing; displacement sensor based on optical nanofiber; (4) Optical computing interfaces with quantum systems. Marie Curie IOF Fellow (2011), City of Paris Young Scientist Award (2015).

Grange leads the Optical Nanomaterial Group at ETH, developing nonlinear materials for quantum photonic integrated circuits. Research directions: (1) Barium titanate (BTO) nanophotonics — scalable CMOS-compatible BTO thin-film integrated circuits exploiting large χ(2) nonlinearity for quantum entangled photon-pair generation via SPDC; (2) Lithium niobate on insulator (LNOI) — quantum photonic integrated circuits for heralded single-photon sources and electro-optic transduction; (3) Second-harmonic generation sensing — SHG-active nanocrystals as contrast agents and phase-sensitive probes in biological imaging; (4) On-chip entangled photon sources for quantum communication and sensing. Strong quantum sensing application in nonlinear optical readout of quantum states.

Develops colloidal semiconductor nanocrystal platforms for infrared detection and sensing. Directions: (1) HgTe and HgSe colloidal quantum dot mid-IR photodetectors operating at room temperature — record sensitivity for solution-processed IR sensors; (2) electro-optic modulation using nanocrystal films at ultrafast timescales; (3) fundamental optical and transport properties of doped nanocrystals. Primary application: low-cost infrared imaging and chemical sensing.

Halsall is a senior PSI photonics researcher focusing on semiconductor spectroscopy and photonic quantum device characterization. Research directions: (1) Deep-level transient spectroscopy (DLTS) — characterizing defects and impurities in semiconductor quantum device structures (Si, GaN, SiC) that are relevant to qubit coherence; (2) Photoluminescence mapping — spatial mapping of optical quality in quantum well and dot wafers for quantum sensing device development; (3) InGaN/GaN quantum wells — non-destructive optical characterization of LED and sensor structures; (4) THz and infrared spectroscopy — contactless Hall measurements and Drude response for quantum material characterization. Provides photonic metrology tools for characterizing quantum sensing device materials.

Heinze designs earth-abundant luminescent metal complexes -- the 'molecular ruby' (Cr(III)) family and its Mo(III) NIR-II-emitting analogues -- and studies their excited-state dynamics with time-resolved luminescence, ultrafast spectroscopy and EPR, in collaboration with spin-spectroscopy groups including van Slageren at Stuttgart. Applications targeted include optical sensing (oxygen, pressure, temperature), NIR-II imaging in the tissue-transparency window, and photocatalysis. Relative to the established NV-ensemble quantum-sensing playbook (DEER, nanoscale NMR, T1 relaxometry at pT/sqrt(Hz) ensemble sensitivity), this is a dye/label-based sensing inclusion rather than a spin-defect one: the emphasis is on engineering the emitter's photophysics so that lifetime and intensity report on the local environment, which is directly comparable to nanodiamond thermometry/relaxometry but at the molecular scale.