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A: Fachverband Atomphysik

A 29: Ultra-cold atoms, ions and BEC II

A 29.2: Vortrag

Donnerstag, 15. März 2012, 10:45–11:00, V47.02

Raman cooling in a 1D lattice with additional radial confinement — •Andreas Steffen, Noomen Belmechri, Sebastian Hild, Andrea Alberti, Wolfgang Alt, and Dieter Meschede — Institut für angewandte Physik, Wegelerstr. 8, Bonn

Quantum information technology requires the interaction of qubits to realize devices like quantum cellular automata or phenomena like molecular bound states in quantum walks. For atoms in optical lattices, it is implemented most conveniently by controlled cold collisions, which requires the preparation of the atoms in the vibrational 3D ground state to achieve a well-defined interaction phase. We present current results on cooling single atoms in a 1D optical lattice with enhanced radial confinement. Two optically phase-locked Raman lasers have been built to couple different motional states. To meet the Lamb-Dicke criterion to cool the motion in the radial directions of our 1D lattice geometry, we overlap a repulsive hollow-core beam created by a phase mask. This increases the radial trap frequency by a factor of ten, allowing resolved Raman sideband cooling.