Rostock 2019 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 63: Ultracold Atoms (Trapping and Cooling)
Q 63.6: Vortrag
Freitag, 15. März 2019, 11:45–12:00, S SR 211 Maschb.
QUANTUS-2 - Utilizing quadrupole mode excitation to gain ultra-low expansion rates of an atomic ensemble — •Merle Cornelius1, Sven Herrmann1, Claus Lämmerzahl1, and the QUANTUS-Team1,2,3,4,5,6 — 1ZARM, Universität Bremen — 2Institut für Quantenoptik, LU Hannover — 3Institut für Physik, JGU Mainz — 4Institut für Physik, HU Berlin — 5Institut für Quantenphysik, Universität Ulm — 6Institut für angewandte Physik, TU Darmstadt
Highly sensitive quantum sensors based on atom interferometry enable precision measurements for various applications. Their sensitivity benefits from long interferometers times in the range of seconds, which in turn require ultra-low expansion rates of the atomic ensemble, typically realized by magnetic lensing (delta-kick collimation).
QUANTUS-2 is a high-flux BEC source operating in microgravity at the drop tower in Bremen. Our setup utilizes an atom chip and enables rapid BEC production. On the downside the resulting cylindrically shaped magnetic lens only allows for a good collimation in the two radial directions. We solve this problem by exciting quadrupole modes to collimate the axial direction, thus achieving three dimensional expansion rates in the order of 100 µm/s, which corresponds to a thermal temperature below 100 pK. Hence we provide an ideal source for highly sensitive atom interferometry on long time scales.
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.