Mainz 2017 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 28: Precision Measurements and Metrology: Interferometry II
Q 28.2: Talk
Tuesday, March 7, 2017, 14:45–15:00, P 104
Fast BEC transport with atoms chips for inertial sensing — •Robin Corgier1, Sirine Amri2, Eric Charron2, Ernst Maria Rasel1, and Naceur Gaaloul1 — 1Leibniz University of Hanover, Germany — 2Université Paris-Sud, France
Recent proposals in the field of fundamental tests of foundations of physics assume Bose-Einstein condensates (BEC) as sources of atom interferometry sensors. Atom chip devices have allowed to build transportable BEC machines with high repetition rates as demonstrated in the QUANTUS project. The proximity of the atoms to the chip surface is, however, limiting the optical access and the available interferometry time necessary for precision measurements. In this context, a fast and perturbation-free transport of the atoms is required. Shortcuts to adiabaticity protocols were proposed and allow in principle to implement such sequences with well defined boundary conditions. In this theoretical study, one can engineer suitable protocols to move atomic ensembles trapped at the vicinity of an atom chip by tuning the values of the realistic chip currents and external magnetic fields. Experimentally applicable trajectories of the atomic trap optimizing the transport time and reducing detrimental effects due to the offset of atoms positions from the trap center are found using a reverse engineering method. We generalize the method in order to optimize the size evolution and the center of a BEC wave packet in phase space. This allows an efficient delta-kick collimation to the pK level as observed in the Quantus 2 experiment. With such low expansion rates, atom interferometry experiments with seconds of drift time are possible.