He is professor of quantum mechanics and information theory at the Université Libre de Bruxelles and a member of the Royal Academies for Science and the Arts of Belgium.
He is the director of the Center for Quantum Information and Computation at the Université Libre de Bruxelles.
Together with Christoph Adami, he defined the quantum version of conditional and mutual entropies,[1][2] which are basic notions of Shannon's information theory, and discovered that quantum information can be negative[1] (a pair of entangled particles was coined a qubit-antiqubit pair).
He is best known today for his work on quantum information with continuous variables.
This has led to the first experimental demonstration of continuous-variable quantum key distribution with optical coherent states and homodyne detection.