Stuttgart 2012 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 51: Ultra-cold atoms, ions and BEC III

Q 51.5: Vortrag

Donnerstag, 15. März 2012, 15:00–15:15, V47.02

A bosonic Josephson junction controlled by a single trapped ion — •Rene Gerritsma1, Antonio Negretti2, Hauke Doerk3, Zbigniew Idziaszek4, Tomasso Calarco2, and Ferdinand Schmidt-Kaler11Quantum, Institut für Physik, Johannes Gutenberg Universität, Mainz — 2Institut für Quanteninformationsverarbeitung, Universität Ulm — 3Max-Planck-Institut für Plasmaphysik, Garching — 4Faculty of Physics, University of Warsaw, Poland

We theoretically investigate the properties of a double-well bosonic Josephson junction coupled to a single trapped ion. We find that the coupling between the wells can be controlled by the internal state of the ion, which can be used for studying mesoscopic entanglement between the two systems and to measure their interaction with high precision. As a particular example we consider a small 87Rb Bose-Einstein condensate controlled by a single 171Yb+ ion. We calculate interwell coupling rates reaching 100 Hz, while the state dependence amounts to 10s of Hz for plausible values of the currently unknown s-wave scattering length between the atom and the ion. The system could be realized in an experiment by combining trapped ions with optical dipole traps for cold atoms or in a combined atom-ion micro trap, where both approaches are within reach using current technology.

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