Rostock 2019 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 57: Poster: Quantum Optics and Photonics III

Q 57.5: Poster

Thursday, March 14, 2019, 16:15–18:15, S Fobau Physik

A High-Performance Upgrade for Very Long Baseline Atom Interferometry — •Dorothee Tell, Christian Meiners, Etienne Wodey, Robert J. Rengelink, Dennis Schlippert, Christian Schubert, Wolfgang Ertmer, and Ernst M. Rasel — Institut für Quantenoptik, Leibniz Universität Hannover, Germany

Scaling up atom interferometry to a vertical baseline of 10 m enables higher precision in absolute measurements of gravity and its gradients as well as in tests of fundamental physics, such as quantum macroscopicity limits or Einstein's equivalence principle.

In the Hannover Very Long Baseline Atom Interferometry facility (VLBAI) we aim for an increased control of systematic errors which affect devices of this scale factor by especially tackling the reduction and monitoring of environmental perturbations in the measurement sequence. This particularly constrains the choice of materials and design concepts, but also calls for the development of new techniques in atom optics.

In this contribution we present the performance of a dual layer octagonal magnetic shield, reducing the gradients along the baseline. Additionally, we provide details on the seismic attenuation system which uses a unique combination of passive and active isolation as well as monitoring of residual motion for post-correction. Finally, we show progress on the high-flux source of ultra-cold rubidium.

The VLBAI facility is a major research equipment funded by the DFG. We acknowledge support from the CRCs 1128 ``geo-Q'' (project A02) and 1227 ``DQ-mat'' (project B07).