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Q: Fachverband Quantenoptik und Photonik

Q 21: Ultracold Atoms and Plasmas (joint session Q/A)

Q 21.1: Poster

Tuesday, March 15, 2022, 16:30–18:30, P

Controlling multipole moments of magnetic chip traps — •Tobias Liebmann and Reinhold Walser — Institute of Applied Physics, TU Darmstadt, Hochschulstr. 4a, 64289 Darmstadt, Germany

Magnetic chip traps are a standard tool for trapping atoms [1, 2]. These are robust devices with multiple fields of use ranging from fundamental physics experiments [3] to applications of inertial sensing [2]. While magnetic traps do provide good confinement potentials, they are not perfectly harmonic. In particular, they do exhibit cubic anharmonicities. In this contribution, we discuss a method for designing printable two-dimensional wire guides which compensate unfavorable multipole moments. Parametrizing a wire shape with suitable basis functions allows us to calculate the magnetic induction field using the Biot-Savart law from Magnetostatics. This enables us to control the multipole moments in proximity to the trap minimum.
[1] J. Reichel, and V. Vuletic, eds. Atom chips (John Wiley & Sons, Weinheim, 2011).
[2] M. Keil, et al., Fifteen years of cold matter on the atom chip: promise, realizations, and prospects, Journal of Modern Optics 63, 1840 (2016).
[3] D. Becker, et al., Space-borne Bose-Einstein condensation for precision interferometry, Nature 562, 391 (2018).