Hannover 2013 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 56: Poster III

Q 56.72: Poster

Donnerstag, 21. März 2013, 16:00–18:30, Empore Lichthof

Non-adiabatic quantum state control in few-well few-atom systems — •Malte C. Tichy, Mads Kock Pedersen, Klaus Mølmer, and Jacob F. Sherson — Lundbeck Foundation Theoretical Center for Quantum System Research, Department of Physics and Astronomy, University of Aarhus, DK-8000 Aarhus C, Denmark

A scheme for arbitrary unitary control of ensembles of interacting bosonic atoms in two-well systems is presented, which uses a discrete sequence of local potential variations as the only control parameter. Exact solutions, readily available for infinite interaction strength, are used as a starting point for numerical optimization yielding high-fidelity procedures to arbitrarily manipulate quantum states. We thereby combine universal but artificially constrained ``bang-bang'' quantum control with the Euler-decomposition of large unitary matrices to yield a practical powerful scheme. We demonstrate the efficiency of our proposal with non-adiabatic population transfer, N00N-state creation, and transistor-like, conditional evolution of several atoms.