Quasiprobability distributions have played an important role in the development of quantum mechanics from its beginnings. The Wigner function and the phase-space formulation of quantum mechanics played and continue to play a crucial role in the development of quantum mechanics and quantum information theory over the last few decades.

This conference on Quasiprobability distributions in quantum mechanics, optics and information (QuiDiQua) will bring together physicists and mathematicians studying all aspects of the use of quasiprobabilities in quantum mechanics, as well as of their recent applications in quantum information theory and quantum metrology. This is the third in a series of conferences, the first two of which took place in Lille in 2023 and in Milan in 2024.

Topics that will be covered include:

• Nonclassicality witnesses, measures and monotones
• Entanglement witnesses, measures and monotones
• Gaussian and non-Gaussian quantum optics
  
• Phase-space representations in quantum experiments
• Quantum metrology and parameter estimation
• Contextuality
• Weak measurements and weak values

The conference will take place at the Insitut Henri Poincaré in Paris, from November 5th (12pm) to November 7th (5pm), 2025.

Registration is free but mandatory, deadline on the 26th of September 2025.

Format

The conference will feature a selection of invited talks, as well as contributed flashtalks from participants. To contribute a flashtalk, please submit for review a 1-2 pages abstract, deadline on the 5th of September 2025.

Invited speakers:

• Juani Bermejo-Vega – University of Granada (Spain)
• Raymond Brummelhuis - Université de Reims Champagne Ardenne (France)
• Justin Dressel - Chapman University (USA)
• Christos Gagatsos – University of Arizona (USA)
• Ilaria Gianani - Università degli Studi Roma Tre (Italy)
• Aaron Goldberg – National Research Council of Canada (Canada)
• Tobi Haas – Ulm University (Germany)
• Benjamin Huard – École Normale Supérieure de Lyon (France)
• Caroline Lasser – Technische Universität München (Germany) 
• Jeff Lundeen – University of Ottawa (Canada)
• Matteo Paris – University of Milan (Italy)
• Saleh Rahimi-Keshari – Institute for Research in Fundamental Sciences (Iran)
• David Schmid – Perimeter Institute (Canada)
• Jan Sperling – Paderborn University (Germany)
• Raghavendra Srinivas – University of Oxford (UK)
• Rosa Tualle-Brouri – Institut d'Optique (France)
• Michael Zurel – Simon Fraser University (Canada)

Committees

Steering committee:

• David Arvidsson-Shukur – University of Cambridge and Hitachi Cambridge Laboratory (UK)
• Stephan De Bièvre – Université de Lille (France)
• Giulia Ferrini – Chalmers University of Technology (Sweden)
• Anaelle Hertz  – National Research Council of Canada (Canada)
• Andrew Jordan – Chapman University and the University of Rochester (USA)
• Matteo Paris – University of Milan (Italy)

Organizing committee:

• Ulysse Chabaud – INRIA & École Normale Supérieure, Paris (France)
• Valentina Parigi – Laboratoire Kastler–Brossel, Sorbonne Université, CNRS, Paris (France)
• Zacharie Van Herstraeten  – INRIA & École Normale Supérieure, Paris (France)

Sponsors