title: Efficient creation of multipartite entanglement in flux qubits.
abstract: We investigate three superconducting flux qubits coupled in a loop. In this setup, tripartite entanglement can be created in a natural, controllable, and stable way. Both generic kinds of tripartite entanglement--the W type as well as the GHZ type entanglement--can be identified among the eigenstates. We also discuss the violation of Bell inequalities in this system and show the impact of a limited measurement fidelity on the detection of entanglement and quantum nonlocality.
authors.affiliation: Institut für Theoretische Physik, Johann Wolfgang Goethe-Universität, Max-von-Laue-Strasse 1, 60438 Frankfurt am Main, Germany.
authors.forename: J
authors.initials: J
authors.lastname: Ferber
authors.forename: F K
authors.initials: FK
authors.lastname: Wilhelm