We want to manipulate light at the quantum level, i.e. at the level of single photons. A first aim is to develop the experimental
techniques that will enable these kinds of experiments. We thus develop sources of photon pairs in optical fibers and in silicon
nanostructures and we manipulate entangled photons in the frequency domain. A second aim is to realize quantum communication
protocols that don't have a classical analog, such as quantum cryptography or quantum coin tossing.