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Q: Fachverband Quantenoptik und Photonik

Q 17: Quantum Information: Atoms and Ions I

Q 17.6: Vortrag

Dienstag, 9. März 2010, 15:45–16:00, E 214

Coherent Transport of Atomic Quantum States in a Scalable Shift Register — •Malte Schlosser, Jens Kruse, Andre Lengwenus, Sascha Tichelmann, and Gerhard Birkl — Institut für Angewandte Physik, Technische Universität Darmstadt, Schlossgartenstraße 7, 64289 Darmstadt

The coherent control of the internal and external quantum states of ultra-cold neutral atoms represents an important experimental approach towards quantum information processing. An attractive architecture is given by physically independent qubits arranged in a scalable quantum register. In our experiment we obtain a suitable system of two-dimensional periodic potentials employing microfabricated lens arrays. While coherent storage and single-site adressability, offering the direct manipulation of individual qubits, are inherent for this design one has to implement techniques to connect distinct traps in order to perform two qubit operations. A natural way is to precisely control interaction by actively arranging the positions of individual qubits.
We present the controlled coherent transport of two-dimensional arrays of small ensembles of ⁸⁵Rb atoms. The scalable shift register is an all optical device which offers precise control of the position of trapped neutral atoms. The shift operation is based on consecutive loading, moving and reloading of two independently controllable arrays of traps. We show the scalability of our architecture and of the transport process by demonstrating the repeated hand-over of atoms from trap to trap. We investigate the processes of transport and reloading in detail and demonstrate the conservation of coherence during transport.