title: Operational framework for nonlocality.
abstract: Because of the importance of entanglement for quantum information purposes, a framework has been developed for its characterization and quantification as a resource based on the following operational principle: entanglement among N parties cannot be created by local operations and classical communication, even when N-1 parties collaborate. More recently, nonlocality has been identified as another resource, alternative to entanglement and necessary for device-independent quantum information protocols. We introduce an operational framework for nonlocality based on a similar principle: nonlocality among N parties cannot be created by local operations and allowed classical communication even when N-1 parties collaborate. We then show that the standard definition of multipartite nonlocality, due to Svetlichny, is inconsistent with this operational approach: according to it, genuine tripartite nonlocality could be created by two collaborating parties. We finally discuss alternative definitions for which consistency is recovered.
authors.affiliation: Institut de Ciencies Fotoniques, Barcelona, Spain.
authors.forename: Rodrigo
authors.initials: R
authors.lastname: Gallego
authors.forename: Lars Erik
authors.initials: LE
authors.lastname: Würflinger
authors.forename: Antonio
authors.initials: A
authors.lastname: Acín
authors.forename: Miguel
authors.initials: M
authors.lastname: Navascués
mesh_terms: D007257:Information Theory; D008962:Models, Theoretical; D011789:Quantum Theory