Berlin 2014 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 37: Quantum information: Concepts and methods I

Q 37.1: Talk

Thursday, March 20, 2014, 10:30–10:45, Kinosaal

Entangled particles in a dynamically controlled trap — •Thomas Stefan Häberle and Matthias Freyberger — Institut für Quantenphysik, Universität Ulm, D-89069 Ulm

We consider two colliding particles in a harmonic trap, whose trap frequency could be varied within a narrow interval. However, the interaction of the particles, modelled via point-like collisions, will remain fixed. By applying optimal control theory we will improve the motional entanglement of the particles at some final time T in comparison to the best static trap. This motional entanglement can, for example, be measured by the violation of a suitable Bell inequality. Therefore, we propose a modified gradient method, that overcomes some numerical problems of the restricted optimization problem. It turns out that a time-dependent steepness of the trap will significantly increase motional entanglement after many collisions even for a strongly restricted trap frequency.