Bonn 2025 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 25: Poster – Cold Atoms and Molecules, Matter Waves (joint session Q/A/MO)
Q 25.39: Poster
Tuesday, March 11, 2025, 14:00–16:00, Tent
Challenges behind performing atom interferometry in extended free fall — •Priyanka Barik1, Dorthe Leopoldt1, Anurag Bhadane2, Julia Pahl3, Sven Abend1, Sven Herrmann4, André Wenzlawski2, Patrick Windpassinger2, Markus Krutzik3,7, Ernst M. Rasel1, and QUANTUS Team1,2,3,4,5,6,7 — 1LU Hannover — 2JGU Mainz — 3HU Berlin — 4ZARM, U Bremen — 5U Ulm — 6TU Darmstadt — 7FBH Berlin
The QUANTUS-2 apparatus is a high-flux 87Rb BEC machine, based on a magnetic chip-trap, which generates 1×105 atoms at a 1Hz rate. High-precision quantum sensing with atom interferometers requires long interrogation time of several seconds with ultra-low expansion rates of the BECs. Thus, we perform our experiment in the Drop Tower in Bremen with a novel matter-wave lens system for the collimation of the condensate. The QUANTUS-2 setup experiences noticeable tilts and rotations which alter the spatial rotation of the 87Rb atomic cloud and its projection along the imaging axes and the interferometry pulses. These rotations lead to position offsets, which become more pronounced as the TOF is increased, and, hence, are expected to contribute to a loss of contrast of the interferometer. We report on the proposal to mitigate these problems using a retro-reflective mirror mounted on a tip/tilt platform which will pave the way for long interrogation times. This project is supported by the German Space Agency DLR with funds provided by the Federal Ministry for Economic Affairs and Climate Action under grant numbers DLR 50WM1952-1957 and DLR 50 WM 2450A-F.
Keywords: Atom Interferometry; Bose Einstein Condensate; Free fall