Hannover 2016 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 12: Ultra-cold atoms, ions and BEC (with A)

Q 12.1: Poster

Montag, 29. Februar 2016, 16:30–19:00, Empore Lichthof

Heating and decoherence effects in a hybird atom-ion system — •Tao Yin, Tao Qin, and Walter Hofstetter — Institut für Theoretische Physik, Johann Wolfgang Goethe-Universität, 60438 Frankfurt/Main, Germany

In this work we study heating and decoherence effects in a hybrid atom-ion system, in which the atom and ion are trapped by a harmonic trap and Paul trap, respectively. We consider the entangled state of one ion strongly coupled to one atom. As a consequence of the time-dependent trapping potential and short-range atom-ion collisions, the ionic micromotion plays an important role in such systems. We investigate the dynamic properties in this system by the Floquet formalism and calculate the effects of heating and decoherence arising from the ionic micromotion. We also study the validity of the secular approximation for different atom-ion mass ratios and trapping geometries. Our results can be used to explain and design experiments on hybrid atom-ion simulators of this type. In addition, we consider adding a second ion to this system, and preliminarily study its possible effects on the atom-ion entangled state due to the long-range coulomb interaction between these two ions.