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Q: Fachverband Quantenoptik und Photonik
Q 33: Matter Wave Interferometry I
Q 33.6: Vortrag
Mittwoch, 12. März 2025, 12:15–12:30, HS I
Entangled center-of-mass dynamics of diffraction wavelets in a matter-wave beam splitter — •Adam Abdalla1, Abhay Mishra2, Oleksandr Marchukov3, and Reinhold Walser4 — 1Institute of Applied Physics, TU Darmstat, Darmstadt, Germany — 2Institute of Applied Physics, TU Darmstadt, Darmstadt, Germany — 3Institute of Applied Physics, TU Darmstadt, Darmstadt, Germany — 4Institute of Applied Physics, TU Darmstadt, Darmstadt, Germany
The resonant momentum exchange between matter-waves and photons from counter-propagating laser beams leads to Bragg diffraction.It is the building block of atom-interferometry used for quantum metrology and inertial sensing [1]. Usually, it is described by a Schrödinger-equation for the matter-wave amplitudes in a static plane-wave basis. However, in typical experiments with Bose-Einstein condensates, one has a superposition of several wavelets ψ(r,t)=∑l cl(t)u(r, R(l)(t), K(l)(t)) that extend in the longitudinal x-direction over many optical wavelength σx≫ λL and are much smaller than the Gaussian laser waist w0≫σy,z in the transversal direction [2]. In this contribution, we analyze the dynamical center-of-mass evolution of the coupled diffraction wavelets (cl(t), R(l)(t), K(l)(t)) in the non-separable Bragg interference potential [3]. The results are supported by (3+1)D simulations of the Gross-Pitaevskii equation and experiments of QUANTUS Collaboration (DLR, grant number 50WM2450E). [1] S. Abend, et al., AVS Quantum Sci. 6, 024701 (2024) [2] A. Neumann, et al., Phys. Rev. A 103, 043306 (2021) [3] S. Blatt, et al., Phys. Rev. A 80, 052703 (2009)
Keywords: Bragg beam-splitter; transversal motion; interferometry; BEC; QUANTUS