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Q: Fachverband Quantenoptik und Photonik

Q 41: Quanteninformation (Konzepte II)

Q 41.6: Talk

Wednesday, March 21, 2007, 15:15–15:30, 5L

Novel schemes and states for measurement-based quantum computation — •David Gross and Jens Eisert — Imperial College London, 58 Prince’s Gate, London SW7 2PE, UK

We establish a framework which allows one to systematically construct novel schemes for measurement-based quantum computation. The technique utilizes tools from many-body physics – based on finitely correlated or projected entangled pair states – to go beyond the cluster-state based one-way computer. We identify universal resource states with radically different entanglement properties than the cluster state, and computational models where the randomness is compensated in a different manner. It is shown that there exist universal resource states which are locally arbitrarily close to a pure state. We find that non-vanishing two-point correlation functions are no obstacle to universality. We comment on the possibility of tailoring computational models to specific physical systems as, e.g. in linear optical experiments.