Hannover 2020 – scientific programme
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A: Fachverband Atomphysik
A 12: Ultracold atoms, ions, and BEC III (joint session A/Q)
A 12.5: Talk
Tuesday, March 10, 2020, 15:15–15:30, f303
QUANTUS-2 - Towards double Bragg interferometry in microgravity with a collimated BEC — •Merle Cornelius1, Peter Stromberger2, Julia Pahl3, Christian Deppner4, Sven Herrmann1, Claus Lämmerzahl1, and The QUANTUS-Team1,2,3,4,5,6 — 1ZARM, Universität Bremen — 2JGU Mainz — 3HU Berlin — 4LU Hannover — 5Universität Ulm — 6TU Darmstadt
Quantum sensors based on matter wave interferometry have a wide range of applications for geodesy or tests of fundamental physics. The sensitivity of such precision measurements increase with the interrogation time, thus operating on a microgravity platform is highly beneficial. As a pathfinder for future space missions, the QUANTUS-2 experiment was designed to perform atom interferometry during the free fall time at the ZARM drop tower in Bremen. Our atom chip setup enables rapid BEC production of Rb-87 atoms and utilization of delta-kick collimation to reduce the residual expansion below 100 µm/s. The collimated ensemble, observable after 2 s with a high signal to noise ratio, provides an excellent input source for atom interferometry on long time scales. Here we present first results on ground based interferometric measurements with single Bragg diffraction and a prospect to double Bragg interferometry with a collimated BEC in microgravity with long interferometer times in the range of seconds.
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 50WM1952.