Hannover 2010 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 55: Poster II

Q 55.13: Poster

Thursday, March 11, 2010, 16:00–19:00, Lichthof

Single site addressability in optical lattices — •Endres Manuel, Christof Weitenberg, Jacob Sherson, Marc Cheneau, Ralf Labouvie, Rosa Glöckner, Immanuel Bloch, and Stefan Kuhr — Max-Planck-Institut für Quantenoptik, Garching

Investigations of ultracold quantum gases in optical lattices are mostly restricted to access global information of the system. By contrast we are developing experimental techniques revealing the local distribution of the trapped gas. The main part of our experiment is an optical imaging system with a spatial resolution better than the lattice spacing of a near-infrared optical lattice. In addition the setup allows for manipulation of the atoms on a local scale.

Collecting the fluorescence light of the trapped atoms, will enable us to observe the local dynamics of the many-body system. With an additional strongly focused laser beam single sites of the optical lattice can be addressed. Possible applications of single site addressability are e.g. single q-bit rotations via local microwave-resonance or perturbation of the many-body system on a local scale.

So far we have taken in trap fluorescence images with a resolution of 700 nm using the 5S1/2 to 5P3/2 transition at 780nm and demonstrated the micro-manipulation of a few atoms with a tightly focused dipole trap. To extract one or a few slices and to remove the atoms that are out of the depth of focus we use microwave transitions in a magnetic field gradient.