Recorded 30 April 2025. Francois Golse of the École Polytechnique presents "Wasserstein Distance and the Observability Problem in Quantum Mechanics" at IPAM's Dynamics of Density Operators Workshop. Abstract: The purpose of this talk is to present an approach to the observability problem for the Schrödinger or the quantum Liouville (i.e. von Neumann) equation that is based on a propagation estimate for a quantum analogue of the Wasserstein distance of order two. (Work in collaboration with Thierry Paul) Learn more online at: https://www.ipam.ucla.edu/programs/workshops/workshop-ii-dynamics-of-density-operators/