Hannover 2013 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 35: Poster I

Q 35.10: Poster

Tuesday, March 19, 2013, 16:00–18:30, Empore Lichthof

Optimal control of entanglement under restrictions — •Thomas Stefan Häberle and Matthias Freyberger — Institut für Quantenphysik, Universität Ulm, D-89069 Ulm

We present a novel iterative algorithm with a special presearching step that can optimize the entanglement of a coupled quantum system while fulfilling restrictions of the control function. As an example we regard two atoms in a harmonic trap which interact via pointlike collisions. Our aim is to improve the entanglement at a fixed time by dynamically varying the trap frequency within a fixed interval. In order to get rid of the restrictions for the trap frequency, we use a suitable parametrization that transforms the optimization problem from a restricted to an unrestricted one. By applying the presearching step we get a reasonable initial guess for the optimal trap frequency. Finally, we use a standard method based on optimal control theory to further increase the entanglement.