Conference Agenda

So far ultracold quantum gases have been produced using time-sequential cooling stages, which limits what can be done with them. I present how we achieve continuous Bose-Einstein condensation, creating condensates that persist. We are going to use our techniques to create continuously operating superradiant and zero-deadtime optical atomic clocks.

Superradiance of atoms in an optical cavity can be harvested to act as optical frequency reference. We discuss an architecture for such a "superradiant laser": a thermal beam of atoms, excited prior to entering the cavity. We present our experiment, relying on the 1S0-3P1 line of ⁸⁸Sr; and introduce a theory informative on its coherence time.

Dans un ensemble d'atomes froids fortement couplés à une cavité optique, nous observons la protection des polaritons envers des inhomogénéités en fréquence. Nous manipulons également des pinces à atomes uniques avec une microcavité, ouvrant la voie à des simulations quantiques impliquant des interactions à longue portée médiées par cavité.

Notre dispositif expérimental permet d'étudier la diffusion multiple de photons dans un grand nuage désordonné d'atomes froids d'ytterbium. La spécificité de cet atome permet une grande contrôlabilité des expériences mises en place. Les premiers résultats seront présentés ainsi que les perspectives vers la localisation d'Anderson de la lumière.

The Coherent Forward Scattering (CFS) peaks is a hallmark of strong localization. In our experiment, we use a Bose-Einstein condensate in a time-modulated 1D-optical lattice, to implement chaotic dynamics with matter waves leading to dynamical localization, and make the first direct experimental observation of the CFS peak.

This study falls within the emerging field of quantum optics in scattering media. We use wavefront shaping to transmit quantum entanglement through a scattering layer. We show that this can be done even if classical light is not refocused after the medium.