Hannover 2016 – scientific programme
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A: Fachverband Atomphysik
A 9: Ultra-cold atoms, ions and BEC (with Q)
A 9.14: Poster
Monday, February 29, 2016, 16:30–19:00, Empore Lichthof
Optimized atomic transport with an atom chip — •Robin Corgier1,2, Eric Charron2, Ernst Maria Rasel1, and Naceur Gaaloul1 — 1Leibniz University of Hanover, Germany — 2Université Paris-Sud, France
Recent proposals for testing performing a quantum test of Einsteins principle of equivalence 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 [J. Rudolph et al. New J. Phys. 17, 079601 (2015)]. The proximity of the atoms to the chip surface is, however, limiting their optical access and the times the atoms spend in the interferometer 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, we engineer suitable protocols to move atomic ensembles trapped at the vicinity of an atom chip by tuning the realistic chip currents and external magnetic fields. We find a realistic protocole for moving the atomic trap optimizing the transport time and reducing detrimental effects due to the offset of atoms positions from the trap center. Further developments generelizing our method to anharmonic traps and spatially extended atomic wave packets are also discussed.