title: Detecting genuine multipartite entanglement with two local measurements.
abstract: We present entanglement witness operators for detecting genuine multipartite entanglement. These witnesses are robust against noise and require only two local measurement settings when used in an experiment, independent of the number of qubits. This allows detection of entanglement for an increasing number of parties without a corresponding increase in effort. The witnesses presented detect states close to Greenberger-Horne-Zeilinger, cluster, and graph states. Connections to Bell inequalities are also discussed.
authors.affiliation: Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Strasse 1, D-85748 Garching, Germany. toth@alumni.nd.edu
authors.forename: Géza
authors.initials: G
authors.lastname: Tóth
authors.forename: Otfried
authors.initials: O
authors.lastname: Gühne