Mainz 2017 – scientific programme

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A: Fachverband Atomphysik

A 13: Precision Measurements and Metrology: Interferometry I (with Q)

A 13.3: Talk

Tuesday, March 7, 2017, 11:30–11:45, P 104

Trade-off of atomic sources for extended-time atom interferometry — •Sina Loriani, Dennis Schlippert, Christian Schubert, Ernst Maria Rasel, and Naceur Gaaloul — Leibniz University of Hanover, Germany

Proposals for atom-interferometry based sensors designed to detect gravitational waves or testing the universality of free fall assume unprecedented sensitivity for long interferometry times [Hogan et al., Phys. Rev. A 94, 033632, (2016)]. These long drift times of several seconds can be achieved by operation in microgravity and by using phase-space-manipulation techniqes like the delta-kick-collimation(DKC), which drastically reduces the expansion rate of atomic samples [Müntinga, et al. Phys. Rev. Lett. 110, 093602 (2013), T. Kovachy et al., Phys. Rev. Lett. 114, 143004 (2015)]. We present a set of theoretical models that treat the impact of collisions and mean-field on the performance of the kick and compare the efficiency of the collimation for all possible temperature and density regimes. The theoretical study covers commonly used alkaline and alkaline-earth-like ensembles of atoms (Rb, Sr, Yb, etc.). The figure of merit is the size of the ensemble when being lensed as the atomic lenses are subject to aberrations depending on the spatial extent of the cloud and the potentials being used. The analysis shows a clear advantage when using condensed ensembles.