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 16.53: Poster
Montag, 17. März 2014, 16:30–18:30, Spree-Palais
Sympathetic cooling of a micromechanical membrane via ultracold atoms — •Aline Faber, Andreas Jöckel, Maria Korppi, Thomas Lauber, Tobias Kampschulte, and Philipp Treutlein — Universität Basel, Departement Physik, CH-4056 Basel
In the last years hybrid quantum systems started to attract interest as potential interfaces in new quantum technologies. A mechanical element in such a system could act as a transducer between different quantum systems or might be used for metrology applications.
In our experiment we couple the motion of ultracold atoms to the vibrations of a Si3N4 membrane inside an optical cavity. The coupling is mediated by a laser beam that couples to the cavity and, at the same time, creates an optical lattice for the atoms. The motion of the membrane shifts the phase of the reflected light and thereby displaces the lattice potential for the atoms. Inversely, when the atoms oscillate in the lattice they modulate the radiation pressure and thereby act on the membrane. With this coupling we can sympathetically cool the fundamental mode of the membrane down to two Kelvin by laser cooling the atoms.
Here we present our experimental setup and recent results. Further we discuss limitations in the current system due to laser noise and present a new cavity design, which is more stable and compact. With cryogenic pre-cooling of this new, compact cavity and suppression of laser noise, cooling of the membrane to the quantum ground state should be feasible [1].
[1] B. Vogell et al., Phys. Rev. A 87, 023816 (2013)