SAMOP 2023 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 31: Precision Measurements: Atom Interferometry I (joint session Q/A)

Q 31.6: Talk

Wednesday, March 8, 2023, 12:15–12:30, F102

3D simulations of guided BEC interferometers — •Rui Li, Stefan Seckmeyer, and Naceur Gaaloul — 1Leibniz University Hannover, Institute of Quantum Optics, Hannover, Germany

Atom interferometry (AI) has grown into a successful tool for precision measurements, inertial sensing and search for physics beyond standard model. Such high precision measurements are achieved either by large momentum transfer (LMT) or long interrogation times. Recently, the former technique has led to a state-of-the-art separation of more than 400 hbark [1]. In this experiment, Bose-Einstein Condensates (BECs) are used to further enhance precision atom interferometry due to their intrinsically strong coherence and narrow momentum width.*However, simulations of dynamics of BEC interacting with light in a generic 3D setup are limited by computation power and system sizes. In this talk, we present a newly developed numerical toolbox to solve the time-dependent Gross-Pitaevskii equation in 3D. To demonstrate its capability, we study BEC interferometers realized in both free-fall and guided geometry and compare our results with experimental data.*We specifically investigate the double-Bragg diffraction (DBD) of a BEC in a guide by two retro-reflected laser beams in a real-time evolution. Finally, we present a phase scan of a fully guided Mach-Zehnder interferometer based on DBDs combined with Bloch oscillations for LMT.

[1] Gebbe, M., Siemß, JN., Gersemann, M. et al., Nat Comm., 12, (2021) 2544.