Bonn 2025 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 33: Matter Wave Interferometry I
Q 33.8: Talk
Wednesday, March 12, 2025, 12:45–13:00, HS I
Seismic noise suppression for Very Long Baseline Atom Interferometry — •Kai C. Grensemann, Vishu Gupta, Guillermo A. Perez Lobato, Klaus Zipfel, Ernst M. Rasel, and Dennis Schlippert — Leibniz Universität Hannover, Institut für Quantenoptik
The Hannover Very Long Baseline Atom Interferometer (VLBAI) facility offers exciting capabilities for absolute gravimetry beyond state-of-the-art precision with applications in geodesy and test of fundamental physics. Its 10 m baseline enables free fall times of up to 2T=2.4 s and therefore large sensitivity scale factors keffT2. The currently limiting technical noise source for atom interferometers is vibration of the inertial reference mirror. To attenuate seismic vibrations coupling to the mirror, the VLBAI facility is equipped with a unique six degrees of freedom in-vacuum seismic attenuation system (SAS).
Here we present a characterization of the passive seismic isolation performance, as well as our progress towards the six degrees of freedom active stabilization. We utilize three low-noise triaxial seismometers as inertial sensors and six voice-coils for force feedback driven by a digital real-time control system. Furthermore, a central out-of-loop low-noise seismometer can be used to post-correct the interferometer measurements. We estimate that the SAS in combination with ideal post-correction will allow instabilities of below 10−9 m/s2 at 1 s, close to the shot-noise limit of ≈2·10−10 m/s2 for 106 atoms.
Keywords: Atom Interferometry; Qauntum Sensing; Gravimetry