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Une nouvelle source pour l'interférométrie atomique avec un condensat de Bose-Einstein double espèce

Alibert Julien 1
1 Interférométrie (LCAR)
LCAR - Laboratoire Collisions Agrégats Réactivité
Abstract : Atom interferometry has shown its interest for high precision measurements, such as inertial sensors, tests of fundamental physics or fundamental constant measurements. A way to improve sensitivity of such device is to reduce speed dispersion of the atomic cloud. The use of ultra-cold atoms allows increasing the interogation time of atoms and the spatial separation between the interferometer arms. The building of a new atom interferometer with separated arms is ongoing in the laboratory "Collisions Agrégats et Réactivité" at Toulouse. This new setup must meet two objectives. One aim of its conception is to study and develop a new kind of double species Bose-Einstein condensate (B.E.C.) source for atom interferometry with rubidium 87 and 85. This B.E.C. source relies on atom chip technology to cool down and manipulate atoms. This technology is compact and low power consuming, therefore suitable for transportable applications in space. A second aim is to use this interferometer to fix new boundary on the experimental value of atom neutrality thanks to the scalar Aharonov-Bohm effect. In this manuscript I start by exposing and justifying technical choices made for the design of the double isotope B.E.C. source. Then I present the first experimental results compared with numerical simulations and theoretical explanations. During the first laser cooling stage we produce a cloud including 4 × 10^10 rubidium atoms of both isotopes (87 and 85) at 10 µK. This operation can be repeated every second. Following the laser cooling 8×10^9 atoms are loaded into a millimeter sized magnetic trap. Various experiments were performed to characterize the trap. Studies of the trap frequency and depth revealed the limitations of this first prototype. However these theoretical and experimental developments led to design and future implementation of a new generation of micro-chip in our apparatus.
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Alibert Julien. Une nouvelle source pour l'interférométrie atomique avec un condensat de Bose-Einstein double espèce. Physique Nucléaire Expérimentale [nucl-ex]. Université Paul Sabatier - Toulouse III, 2017. Français. ⟨NNT : 2017TOU30350⟩. ⟨tel-02004343⟩

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