Bonn 2025 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 26: Poster – Precision Measurement, Metrology, and Quantum Effects

Q 26.30: Poster

Dienstag, 11. März 2025, 14:00–16:00, Tent

Commissioning of the Very Long Baseline Atom Interferometry facility — •Guillermo Alejandro Pèrez Lobato, Vishu Gupta, Kai C. Grensemann, Klaus Zipfel, Ernst M. Rasel, and Dennis Schlippert — Leibniz Universität Hannover, Institut für Quantenoptik

The Very Long Baseline Atom Interferometry (VLBAI) facility in Hannover opens the possibility of testing questions in fundamental physics e.g. macroscopic delocalization of wavefunctions and constraining fundamental decoherence mechanisms. The 10 m baseline enables free fall times of up to 2T = 2.4 s and therefore large sensitivity scale factors k_effT². The use of this equipment imposes a series of technical demands that need to be achieved such as obtaining an ultracold sample of atoms with the number of atoms in the order of one million, with sub-nanokelvin temperatures.

This contribution focuses on the progress towards achieving highly delocalized matter waves, including the manipulation of rubidium atoms utilizing purely optical potentials for matter wave lensing. We discuss the performance requirements of the atom source in the various parameters of interest such as number of atoms, temperatures required, and others that are imposed by the manipulation and control methods used for the measurement process. The methods utilized include the use of lensing and dipole trap launches with painted optical dipole traps, and the coherent manipulation of atomic wave functions by Bragg beam splitting processes.

Keywords: Bose-Einstein condensates; Atom Interferometry; Quantum Sensing; Gravimetry