Darmstadt 2008 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 50: Poster Ultrakalte Atome

Q 50.21: Poster

Donnerstag, 13. März 2008, 16:30–19:00, Poster C2

State-Selective Transport of Single Caesium Atoms — •Leonid Förster, Michał Karski, Daniel Döring, Florian Grenz, Arne Härter, Wolfgang Alt, Jai-Min Choi, Artur Widera, and Dieter Meschede — Institute for Applied Physics, University of Bonn

The state-selective quantum transport of single neutral atoms in optical lattices offers a promising alternative to implement basic modules of advanced schemes in the context of quantum engineering. These range from the implementation of so called quantum walks, utilizing fundamental quantum effects involving spatial quantum interference to the preparation of so-called cluster states using coherent cold collisions as an inter-qubit interaction.

We investigate systems of single Caesium atoms stored, one by one, in a state-dependent one-dimensional optical lattice. It is formed by a superposition of two standing wave dipole traps with right- and left-handed circular polarisation respectively. They can be shifted with respect to each other. With an appropriate wave length, each of the two lattices couples to a different hyperfine state. Therefore, atoms prepared in these qubit states can be transported in opposite directions. Using microwave pulses in the presence of magnetic field gradients, the internal states can be separately manipulated.

We present the current state of the experimental realisation of a one-dimensional quantum transport for Caesium atoms, focussing on the experimental setup and the tools for the preparation and manipulation of individual qubit states and their spatial detection.