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.

Philippe Grangier is a pioneer of quantum optics and quantum information at the Laboratoire Charles Fabry (IOGS/École Polytechnique). Research: (1) foundations of quantum mechanics: single photon experiments, Bell tests, quantum non-demolition measurement; (2) quantum optics and quantum information — continuous variables, entanglement generation, quantum cryptography; (3) Rydberg atom experiments (in collaboration with Browaeys). Coordinator of SIRTEQ network (700+ quantum researchers in Île-de-France). Closely connected to Pasqal spinoff. Key for quantum sensing foundations.

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.

Edmund Harbord researches quantum communications, solid-state quantum optics, and topological photonic structures. Research: (1) single-photon sources based on solid-state emitters (quantum dots, colour centres); (2) topological photonic crystal structures for robust quantum light propagation; (3) quantum communication protocols. Bridges photonics engineering with quantum networking.

Peter Lodahl's Quantum Photonics Group develops deterministic photon-emitter interfaces using semiconductor quantum dots embedded in photonic nanostructures (nanowires, photonic crystal waveguides). Research targets: single-photon sources with near-unity efficiency and indistinguishability; spin-photon interfaces for quantum repeaters; integrated quantum photonic circuits; and quantum networks based on single emitters. The group leads the Hy-Q Centre for Hybrid Quantum Networks and holds several quantum technology patents and spin-out companies. Borderline case — primarily quantum photonics for networking but with quantum sensing applications (single photon sensing, spin-photon).

Mahmoodian is a quantum-optics theorist working on waveguide QED and photon-photon interactions: how strongly-coupled emitters in a one-dimensional photonic channel generate non-classical photon-number correlations, and how those correlated multi-photon states can be exploited. His most sensing-relevant result is the demonstration that photon-number-correlated states produced by a single emitter can be used for quantum-enhanced metrology and absorption spectroscopy, beating the shot-noise limit with a source that requires no squeezing. He also works on the fundamental limits of quantum-enhanced measurement. 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 work belongs to the 'fundamental light physics' arm of the search rather than the spin arm, and it addresses the question directly downstream of pT/sqrt(Hz) ensembles: given a shot-noise-limited readout, what does non-classical light buy you? Theory PI, but tightly coupled to photonics experiments.

Leonardo Midolo develops III-V optoelectronic quantum devices at NBI. Research: (1) nanomechanical quantum photonic integrated circuits (NOEMS) — GaAs waveguide phase shifters, routers, and switches for single-photon routing; (2) heterogeneous integration of quantum dot emitters on silicon and SiN platforms; (3) quantum key distribution with deterministic single-photon sources over field-installed dark fibre. Group established 2022; Beamfox spinout for proximity correction.

Murthy leads the Nanoscale Quantum Optics group at ETH, studying light-matter interactions in nanostructures to engineer novel quantum states of light. Research directions: (1) Photon-photon interactions — achieving strong effective photon-photon interactions via coupling to quantum emitters in 2D materials and optical nanocavities; exploring photonic Mott insulators and collective quantum phases of light; (2) 2D semiconductor quantum emitters — localized excitons in TMD heterostructures as sources of single photons and entangled photon pairs; (3) Quantum light from cavities — engineering photon statistics and squeezing using cavity-QED with 2D materials; (4) Ultrafast quantum optics — attosecond-scale probing of light-matter entanglement. New group as of ~2023.

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.