Stuttgart 2012 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 50: Kalte Atome: Manipulation und Detektion

Q 50.2: Vortrag

Donnerstag, 15. März 2012, 14:15–14:30, V7.03

Quantum computation with ultracold atoms in driven optical lattices — •Philipp-Immanuel Schneider and Alejandro Saenz — AG Moderne Optik, Institut für Physik, Humboldt-Universität zu Berlin, Newtonstrasse 15, 12489 Berlin, Germany

In the last years tremendous progress has been made in controlling and observing ultracold atoms in optical lattices. One of the latest developments has been the optical detection of atoms with single site resolution in lattices of increasingly smaller periodicity [1,2]. Along with these detection schemes comes the possibility to control the lattice potential with single-site resolution.

We propose a scheme that makes use of these approved technologies to perform quantum computation in optical lattices. The qubits are encoded in the spacial wavefunction of atoms in the Mott insulator phase such that spin decoherence does not influence the computation. Quantum operations are steered by shaking the lattice while the qubits are addressed by locally changing the lattice potential. Numerical calculations show possible fidelities above 99% with gate times on the order of a few milliseconds [3].

[1] W. S. Bakr et al. Nature 462, 74 (2009).

[2] J. F. Sherson et al. Nature 467, 68 (2010).

[3] P.-I. Schneider, A. Saenz preprint arXiv:1103.4950