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Etude et réalisation de micro-pièges dipolaires optiques pour atomes neutres

Nicolas Schlosser 1
1 Laboratoire Charles Fabry de l'Institut d'Optique / Optique quantique
LCFIO - Laboratoire Charles Fabry de l'Institut d'Optique
Abstract : Neutral atoms are possible candidates for the implementation of
quantum gates. In this context, the subject of this study is the realization of
optical dipole traps, small enough to contain only a single atom. In order to
obtain the dipole trap, we need to focus strongly a laser beam at the point
where we want to trap the atoms. The central part of the experiment is an
home-built microscope objective, with a great numerical aperture. This system
focus the light in the center of a Magneto-Optical Trap which is the source of
cold atoms used to load our dipole trap.

The imaging set-up is based on the the same objective. It collects the
fluorescence light coming from trapped atoms with a great efficiency and images
them either on a CCD camera or an avalanche photodiode. The spatial resolution
of the system using the camera gives images of the atom cloud, and the
avalanche photodiode allows us to study the dynamic of the trap with a good
time resolution.

After the description of the experimental set-up, we demonstrate the
realization of microscopic optical dipole traps with a volume of a few cubic
microns and containing a few atoms. The study of loading process and the
lifetime reveals the presence of two body collisions. Then, with a reduced
loading rate, we can see, in real time, single atoms arriving one by one in the
trap. In this regime, a process of "collisionnal blockade" limits the atom
number to one. Finally, we present a realization of a double dipole trap, in
which we can trap two individual atoms in each site.
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Submitted on : Wednesday, March 6, 2002 - 6:41:49 PM
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Nicolas Schlosser. Etude et réalisation de micro-pièges dipolaires optiques pour atomes neutres. Physique Atomique [physics.atom-ph]. Université Paris Sud - Paris XI, 2001. Français. ⟨tel-00001195⟩

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