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Q: Fachverband Quantenoptik und Photonik
Q 27: Poster Quantengase
Q 27.18: Poster
Tuesday, March 11, 2008, 16:30–19:00, Poster C2
Preparing and Detecting Quantum States with Ultracold Atoms in an Optical Superlattice — •Stefan Trotzky1, Ute Schnorrberger1, Patrick Cheinet1, Michael Feld1,2, Jeff Thompson1, Simon Fölling1,3, and Immanuel Bloch1 — 1Johannes Gutenberg Universität Mainz — 2Technische Universität Kaiserslautern — 3Harvard University, USA
Ultracold atoms in optical lattices have shown to be versatile systems to mimick condensed matter physics. The concept of superlattices for ultracold atoms has recently been realized in experiments and extends the toolbox for the manipulation of the system on the many-body scale. Furthermore, it allows to control effective interactions and dynamics emerging in Hubbard-type models. In our experiments, we combine monochromatic optical lattices on two perpendicular axes with a superlattice on the third axis which is formed by the superposition of two standing light fields with periodicity d and 2d to yield an array of double well potentials. We demonstrate how this bichromatic superlattice can be used to realize effective spin Hamiltonians with controllable spin-spin interactions as well as how to measure the atomnumber distribution within the array by means of interaction blockade. Moreover, we are able to create entangled spin-triplet pairs in the double wells and detect these via the coherent transformation into spin-singlet pairs and back.