Hannover 2010 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 63: Quantum Effects: Entanglement and Decoherence III

Q 63.2: Talk

Friday, March 12, 2010, 14:30–14:45, A 310

Optimal dynamical control of many-body entanglement — •Felix Platzer, Florian Mintert, and Andreas Buchleitner — Albert-Ludwigs-Universität Freiburg, Hermann-Herder-Str. 3, 79104 Freiburg

We derive time-dependent control fields, which are suitably tailored to maximize a multipartite entanglement measure and thus steer a given system towards highly entangled states. The usage of an entanglement measure as target functional naturally leads to an optimization over the multitude of states with equivalent entanglement properties, and results in the creation of the most suitable highly entangled state, i.e. the state which is most rapidly produced and most robust against the predominant type of decoherence. This rather general framework is then readily applied to nitrogen vacancy centers in diamond, whose permanent and uncontrollable interaction strengths impede the creation of high entanglement. Not only does our control scheme achieve and maintain strong entanglement through local driving only, but it is also intrinsically robust to possible experimental imperfections, e.g. imperfectly estimated coupling constants or imperfect control sequences.