Dresden 2011 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 25: Matter Wave Optics

Q 25.6: Vortrag

Mittwoch, 16. März 2011, 11:45–12:00, BAR Schön

Trapped atomic gravimeter for near-field force measurements — •Gunnar Tackmann, Quentin Beaufils, Bruno Pelle, Sophie Pélisson, Xiaolong Wang, Marie-Christine Angonin, Peter Wolf, and Franck Pereira Dos Santos — LNE-SYRTE, Observatoire de Paris, CNRS, UPMC, 61 avenue de l’Observatoire, 75014 Paris, France

The realization of matter-wave interferometry on neutral atoms in a vertical 1D lattice coupling the system’s eigenstates, namely the Wannier-Stark states, permits high precision measurements of the energy difference between the lattice wells. In addition to the absolute determination of the gravitational acceleration, this will allow the mapping of the Casimir-Polder potential between the neutral atoms and a macroscopic surface as well as to push the limits on possible derivations from Newtonian gravitation on short distances when performed in the vicinity of the retro-reflective lattice mirror’s surface.

In the experiment Forca-G, such an interferometer is realized with ⁸⁷Rb atoms in a 532 nm lattice. In this talk, we present the current performance of the interferometer far from the mirror surface. Featuring long coherence times in the order of seconds, these measurements are currently limited by the trap lifetime.

This research is carried on within the project iSense, which acknowledges the financial support of the FET programme within the Seventh Framework Programme for Research of the European Commission, under FET-Open grant number: 250072. We also gratefully acknowledge support by Ville de Paris ("Emergence(s)" program) and IFRAF.