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Accueil > FR > Recherche > Physique des Atomes Froids > Séminaire du groupe

Sophie Pelisson- (LP2N-IOA, Talence, France)

par Jean-Claude GARREAU - publié le , mis à jour le

Le 6 février 2016 — 11h — bat. P5bis, salle 172

Testing fundamental laws with cold atoms

In past decades, cold atoms have proved to be a powerful tool for fundamental
physics. Thanks to their quantum properties and the great experimental control
available in such systems, cold atoms can be used in a wide range of domain to explore and test our current understanding of physics. Starting from a system of cold atoms trapped in a lattice, I will focus on two examples of experiment that can be implemented. The first one is developped at the Paris Observatory and aimed to test gravitationnal laws at very short distances and to precisely measure the Casimir- Polder effect. The purpose of this experiment is to set constraints on the deviation from the Newtonian law at short distance predicted by number of unification theory. We demonstrated that the experiment will allow to gain up to 3 orders of magnitude on the constraints for a deviation between two massive objects separated by 1µm. The second experimental scheme I will discuss is a theoretical proposal to test multipartite entanglement and many body non locality. By using a Mott insulator in a lattice and by applying the proper sequence of beam splitter, we showed that the system can show multipartite entanglement and can violate a new class of Bell’s inequalities involving only low order correlations. This proposal can open a way toward the test of non locality in extended system and the test of the resistance of this quantum property under decoherence.