Darmstadt 2008 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 28: Poster Quanteninformation

Q 28.22: Poster

Tuesday, March 11, 2008, 16:30–19:00, Poster C2

Controlled dynamic generation of entanglement — •Thomas Häberle¹, Kilian Singer², and Matthias Freyberger¹ — ¹Institut für Quantenphysik, Universität Ulm, 89069 Ulm — ²Institut für Quanteninformationsverarbeitung, Universität Ulm, 89069 Ulm

We discuss two compact particles in a harmonic trap which interact via pointlike collisions. The interaction can be modelled by a δ-potential in the relative coordinate of the particles. Each collision will dynamically entangle the particles by a certain amount. Therefore, the time evolution of entanglement will show a step-like behaviour [1]. We now study if it is possible to maximize the entanglement at an arbitrarily fixed time by dynamically varying the trap frequency. We approach this problem by using appropriate techniques [2] from optimal control theory.
M. Bußhardt and M. Freyberger, Phys. Rev. A 75, 052101 (2007). [2] T. Calarco et al., Phys. Rev. A 70, 012306 (2004).