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A: Fachverband Atomphysik
A 20: Poster Session I
A 20.13: Poster
Dienstag, 7. März 2017, 17:00–19:00, P OG1
QUANTUS-2 - Towards a Dual-Species Matter-Wave Interferometer in Free Fall — •Merle Cornelius1, Tammo Sternke1, Sven Herrmann1, Claus Lämmerzahl1, and The QUANTUS-Team1,2,3,4,5,6 — 1ZARM, Universität Bremen — 2Institut für Quantenoptik, Leibniz Universität Hannover — 3Institut für Physik, Humboldt-Universität zu Berlin — 4Institut für Physik, Johannes Gutenberg Universität Mainz — 5Institut für Quantenphysik, Universität Ulm — 6Institut für angewandte Physik, TU Darmstadt
The goal of the QUANTUS-2 experiment is to perform dual-species matter-wave interferometry in microgravity at the drop tower in Bremen. Aiming for precision measurements to test the equivalence principle, long interferometer times in the range of seconds are crucial to increase the sensitivity of the measurement. Therefore ultra-low residual expansion rates of the used atomic ensembles are required, which can be achieved by magnetic lensing - also known as delta-kick cooling. Here we present our results of a magnetic lens to collimate a rubidium BEC in microgravity, enabling the observation of the ensemble after 2.7s of free evolution time. Optimization of the lens to reduce the aberrations lowers the expansion rate further and will thus provide an ideal source for precision atom interferometry in microgravity. Resulting future prospects will be discussed.
The QUANTUS project is supported by the German Space Agency DLR with funds provided by the Federal Ministry for Economic Affairs and Energy (BMWi) under grant number DLR 50WM1555-1557.