Berlin 2014 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

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

Q 16.49: Poster

Monday, March 17, 2014, 16:30–18:30, Spree-Palais

Set-up of a hybrid quantum optomechanical system at 30 mK — •Hai Zhong, Gotthold Fläschner, Michael Nitschke, Alexander Schwarz, and Roland Wiesendanger — Institut für Angewandte Physik, Universität Hamburg, Hamburg, Deutschland

We are currently setting up a hybrid quantum optomechanical system in an ultrahigh vacuum (UHV) environment at 30 mK using a ³He/⁴He dilution refrigerator. The newly installed cryostat will be used to precool our mechanical oscillators. It has shown a base temperature of 30.6±2 mK and a cooling power of 560 µW at 100 mK with holding time of more than 12 hours without any device attached. A fiber cavity with a high-Q SiN membrane in the middle (’MIM’) aligned by two sets of home-built five-axis piezo-motors has been constructed and tested at room temperature. The ’MIM’ set-up will be used to indirectly (ex situ) couple to ⁸⁷Rb cold atoms or even to a BEC located in a separate vacuum chamber via optical fibers. The combined system is aiming to cool an ultralow mass membrane down to the quantum mechanical ground state using optomechanical as well as sympathetical cooling schemes. This work is supported by the ERC Advanced Grant ’FURORE’.