Tulio Brito Brasil focuses on multimode quantum optics, squeezed and entangled states of light, and their application for quantum sensing and communication. Research: (1) generation of two-colour high-purity EPR photonic states; (2) squeezed light for quantum noise reduction in measurement; (3) continuous variable quantum optics protocols for networks. Recently joined QUANTOP at NBI.

Bretenaker (former LuMIn director) works on laser physics and quantum optics: sub-shot-noise sensing with phase-sensitive-amplifier-generated entangled beams, spin-noise spectroscopy in atomic vapours, EIT slow light, and quantum-limited passive resonant (fiber/bulk) gyroscopes with Thales. In the broader landscape of NV-centre ensemble quantum sensing (DEER, nano-NMR, T1 relaxometry) operating near pT/sqrt(Hz) sensitivity, this work represents the fundamental-light and quantum-limited-rotation-sensing side.

Rachel Clark's research focuses on integrated quantum photonic devices, squeezed light generation on-chip, and nonlinear photonics. Research: (1) on-chip squeezed light generation in silicon nitride and lithium niobate waveguide platforms; (2) continuous-variable quantum photonic circuits; (3) nonlinear photonics for quantum sensing. This group is directly relevant to quantum-enhanced sensing with squeezed light.

Parigi co-leads the Multimode Quantum Optics group at LKB alongside Treps. Research directions: (1) Multimode squeezed-state quantum networks — generating large-scale entangled cluster states using optical frequency combs; reconfigurable graph-state topologies for measurement-based quantum computing and distributed quantum sensing; (2) Multimode quantum sensing — using multimode squeezed states for simultaneous beyond-shot-noise estimation of multiple parameters (wavelengths, phases) in a spectrometer; (3) Non-Gaussian quantum states — heralded subtraction and addition of photons to Gaussian cluster states for universal CV quantum computation; (4) Quantum networks at telecom — generating multimode squeezed states compatible with fiber transmission. ERC Laureate. Employed by Sorbonne Université.

Parigi leads work on multimode squeezed-light generation using optical frequency combs, engineering large-scale reconfigurable networks of entangled/squeezed light modes for continuous-variable quantum information and multiparameter quantum metrology, alongside Nicolas Treps.

Treps leads the Multimode Quantum Optics group at LKB. Research directions: (1) Multimode quantum frequency combs — synchronously pumped OPO (SPOPO) generates entangled networks of squeezed modes with configurable graph structure; first demonstration of quantum frequency comb with multimode squeezing (PRL 2012); (2) Quantum-enhanced multiparameter estimation — quantum Fisher information and multimode squeezing for simultaneous beyond-shot-noise parameter estimation (e.g., frequency comb spectral centroid and energy, PRX 2020); (3) Non-Gaussian quantum states — heralded generation of non-Gaussian cluster states for CV quantum computing; (4) Quantum metrological inequalities — relating non-locality to parameter estimation. Spin-off: Cailabs (multimode fiber light-shaping for telecom and industrial lasers). Co-director of QICS. ERC-funded.

Nicolas Treps' multimode quantum optics group (with Valentina Parigi and Claude Fabre) generates and characterises highly multimode squeezed and entangled states of light. Research: (1) optical frequency combs as multimode squeezed state resources — quantum metrology and sensing with frequency combs; (2) reconfigurable multimode squeezed state networks for quantum computing and sensing; (3) spatiotemporal squeezing with optical parametric amplifiers. Key for quantum-enhanced sensing with light.

Walschaers provides theoretical support for LKB's multimode quantum-optics team, working on entanglement structure, non-Gaussian states, and metrological usefulness of large-scale squeezed-light networks generated via frequency combs.