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Berlin 2014 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 16: Poster: Quantum information, micromechanical oscillators, matter wave optics, precision measurements and metrology

Q 16.82: Poster

Montag, 17. März 2014, 16:30–18:30, Spree-Palais

An inertial sensitive matter wave interferometer based on 39K — •Logan Richardson, Henning Albers, Dennis Schlippert, Christian Meiners, Jonas Hartwig, Wolfgang Ertmer, and Ernst M. Rasel — Institut für Quantenoptik, Leibniz Universität Hannover, Welfengarten 1, 30167 Hannover

As part of an ongoing experiment that utilizes dual species matter-wave inteferometry to test Einstein’s equivalence principle, we have developed inertially sensitive matter-wave interferometers employing the atomic species 39K and 87Rb. In comparison to 87Rb, the significantly lower mass and lower excited state hyperfine splitting result in 39K being much harder to cool, thus making achievable temperatures the prime obstacle when realizing an interferometer with 39K. We report on our potassium double-MOT system and techniques to overcome the inherent cooling problems, e.g. dark molasses cooling and an optical dipole trap for evaporative and/or sympathetic cooling. We show the first inertial sensitive 39K matter wave interferometer allowing for determination of absolute local gravitational acceleration with pulse separation times of up to T=20ms in a Mach-Zehnder configuration. Moreover, we discuss prospects of simultaneous dual species interferometry.

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