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Q: Fachverband Quantenoptik und Photonik

Q 13: Posters: Quantum Optics and Photonics I

Q 13.20: Poster

Montag, 9. März 2020, 16:30–18:30, Empore Lichthof

Controlling multipole moments of a magnetic chip trap — •Tobias Liebmann and Reinhold Walser — Institut für Angewandte Physik, Technische Universität Darmstadt, Hochschulstr. 4a, 64289 Darmstadt

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 necessarily harmonic, in particular they can exhibit strong cubic anharmonicity. In this contribution, we will discuss methods of designing printable 2D wire guides, which compensate unfavorable multipole moments. A theoretical approach is proposed to reduce the unwanted multipole moments of a Z-chip trap by introducing a small disturbance to the standard wire configuration. Using a suitable representation of the disturbance, the resulting magnetic field is calculated via the Biot-Savart law. This allows one to calculate the multipole moments in proximity to the trap minimum, as a result the rogue multipole moments can be minimized.
[1] J. Reichel, and V. Vuletic, eds. Atom chips. John Wiley & Sons, 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).