M2/PhD offer, Institut Néel, Grenoble Entangled photons pairs are a key resource for quantum information processing, in particular for quantum communications. For example, they enable the realization of quantum relays that can extend the distance of quantum key distribution. To be useful, a source of entangled photon pairs has to be bright and tunable, emit indistinguishable photons, and operapar Jean-Philippe Poizat - Thèses hors de l'EDPIF