Mainz 2017 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 54: Ultracold atoms and BEC - V (with A)

Q 54.1: Talk

Friday, March 10, 2017, 11:00–11:15, N 1

Quantum Galvanometer with ultracold atoms — •Carola Rogulj, Peter Federsel, Malte Reinschmidt, Lukas Gussmann, Andreas Günther, and József Fortágh — Physikalisches Institut, Auf der Morgenstelle 14, D-72076 Tübingen

Hybrid quantum systems are engineered to combine properties and advantages of two quantum systems. Heading for novel quantum technologies, ultracold atoms and nanomechanical resonators are promising candidates for quantum information processing. Ultracold atoms and degenerate quantum gases can be very precisely manipulated and provide long coherence times, which makes them for example well suited quantum memories. Nanomechanical oscillators can not only be functionalized to allow for sensitive force detection, but can also be cooled down to their quantummechanical ground state. In my talk, I will show a Quantum Galvanometer scheme and its experimental realisation, where an oscillating nanomechanical resonator carrying electrical current is brought to interaction with a Bose Einstein condensate of ⁸⁷Rb atoms. This is achieved by means of an atomchip with magnetic conveyor belt. In our case, the resonator consists of a gold coated silicon nitride beam. It creates a fluctuating electromagnetical field which serves as output coupler for an atom laser. We have developed a state and energy selective single atom detection scheme that allows to observe temporal correlations of this atom laser. The magnetomechanically coupled hybrid system will thus enable us to measure the statistics of current fluctuations in a setup that is capable of resolving quantum properties of electrical current.