Bonn 2025 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 33: Matter Wave Interferometry I
Q 33.4: Talk
Wednesday, March 12, 2025, 11:45–12:00, HS I
Transverse recoil of diffraction wavelets within a matter-wave beam splitter — •Abhay Mishra1, Adam Abdalla2, Oleksandr Marchukov3, and Reinhold Walser4 — 1Technical university Darmstadt, Darmstadt, Germany — 2Technical university Darmstadt, Darmstadt, Germany — 3Technical university Darmstadt, Darmstadt, Germany — 4Technical university Darmstadt, Darmstadt, Germany
Atomic Bragg beam-splitters are integral devices for matter-wave interferometers. Interferometric measurements can be used for geodesy, inertial sensing or fundamental physics in space [1]. To achieve the ultimate measurement precision, one has to understand and rectify all sources of aberrations [2], eventually. In this contribution, we consider the transversal recoil of an axially decentered Bose-Einstein condensate in counter-propagating Gaussian beams. Due to the non-separability of the optical dipole potential, one obtains an entanglement between the longitudinal and transversal motion [3]. We study position displacement and momentum transfers using a (3+1D) numerical simulation of the Gross-Pitaevskii equation. These findings are explained by a dynamical model for the coupled motion of the center-of-mass coordinates of the diffraction wavelets, as well as their Schrödinger- amplitudes.
[1] D. Becker, et al., Nature 562, 391 (2018). [2] A. Neumann, et al., Phys. Rev. A 103, 043306 (2021). [3] S. Blatt, et al., Rabi Spectroscopy and Excitation Inhomogeneity in a One-Dimensional Optical Lattice Clock, Phys. Rev. A 80, 052703 (2009).
Keywords: Bragg-beam splitter; Transversal motion; Interferometry; BEC; QUANTUS