Frankfurt 2006 – wissenschaftliches Programm

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SYSA: Quantum state analysis and estimation

SYSA 1: Quantum state analysis and estimation I

SYSA 1.1: Hauptvortrag

Dienstag, 14. März 2006, 10:30–11:00, HVI

Detection and characterization of multipartite entanglement in atomic systems — •Dieter Jaksch and Rebecca Palmer — University of Oxford, Parks road, OX1 3PU Oxford, United Kingdom

We investigate the detection and characterization of multi partite entangled states in systems on neutral atoms. Such states have been realized in seminal recent experiments using optical lattices but their detailed characterization has not been achieved yet. Our scheme is based on measuring violations of entropic inequalities using simple quantum networks involving only two copies of the state under consideration. We first give a detailed discussion of the ideal scheme where no errors are present and full spatial resolution in the measurements is available. Then we discuss the situation where no spatial resolution is available and find that even in this case entanglement can be detected and characterized in various kinds of states including cluster states and macroscopic superposition states. We also study the effects of detection errors and imperfect dynamics on the detection network. For our scheme to be practical these errors have to be on the order of one over the number of investigated lattice sites. Finally, we consider the case of limited spatial resolution and conclude that significant improvement in entanglement detection and characterization compared to having no spatial resolution is only possible if single lattice sites can be resolved.