Quasiprobability distributions have played a central role in the development of quantum mechanics since its earliest days. In particular, the Wigner function and the phase-space formulation of quantum mechanics have been — and remain — fundamental tools in the advancement of both quantum theory and quantum information over the past decades.

The conference on Quasiprobability Distributions in Quantum Mechanics, Optics and Information (QuiDiQua) is dedicated to phase-space representations in quantum mechanics and continuous-variable quantum information, with a particular emphasis on quantum optical implementations. It spans both theoretical and experimental perspectives. The meeting brings together physicists and mathematicians working on all aspects of quasiprobabilities in quantum mechanics, as well as on their recent applications in quantum information theory and quantum metrology.

The fourth edition of QuiDiQua will be held in Brussels, continuing the series after previous conferences in Lille (2023), Milan (2024), and Paris (2025). The series revives and extends the earlier CVQIP (Continuous-Variable Quantum Information Processing) workshops, which took place between 2002 and 2013.