Tayloring quantum states by controlling spin-dependent interactions between ultracold atoms
Artur Widera (Institut für Physik)

Quantum systems with strong inter-particle interactions can exhibit fascinating new effects unknown in classical physics. For example, non-linear atom-atom interactions in an ultracold system can build up correlations between particles, and cause a time evolution from an initially "classical" to an entangled state.
I will discuss how such a time evolution of rubidium atoms in periodic optical potentials can be induced by controlling the inter-particle interactions. I will present experimental results that we have obtained first in a simple "textbook" example of two interacting spin 1/2 particles, and additionally in the more complicated strongly interacting many body system.