Dresden 2011 – scientific programme

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A: Fachverband Atomphysik

A 7: Poster I

A 7.13: Poster

Monday, March 14, 2011, 16:00–18:30, P1

Engineering the Coherences at the Single-Atom Level — •Andrea Alberti, Michal Karski, Leonid Förster, Andreas Steffen, Noomen Belmechri, Wolfgang Alt, Artur Widera, and Dieter Meschede — Institut für angewandte Physik, Universität Bonn

We demonstrate the capability to coherently steer individual neutral cesium atoms with single lattice-site resolution in a spin-dependent optical lattice. Following the so-called *bottom-up* approach, we engineer a few-body quantum system building it up atom by atom. This has recently enabled us to experimentally investigate 1D quantum walks in real space, which form an ideal model system to investigate transport phenomena dominated by quantum interference. Furthermore, it offers us a direct handle on the boundary between classical and quantum world. The entanglement between internal and external degrees of freedom is increased with the number of steps along the walk. At the moment we preserve quantum coherences over more than 10 steps. We are currently exploring single atom interferometry to get a deeper grasp of the phase evolution of a spatially delocalized atom in a spin-dependent optical lattice.