title: Perfect quantum privacy implies nonlocality.
abstract: Private states are those quantum states from which a perfectly secure cryptographic key can be extracted. They represent the basic unit of quantum privacy. In this work we show that all states belonging to this class violate a Bell inequality. This result establishes a connection between perfect privacy and nonlocality in the quantum domain.
authors.affiliation: ICFO-Institut de Ciències Fotòniques, E-08860 Castelldefels, Barcelona, Spain.
authors.forename: Remigiusz
authors.initials: R
authors.lastname: Augusiak
authors.forename: Daniel
authors.initials: D
authors.lastname: Cavalcanti
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Prettico
authors.forename: Antonio
authors.initials: A
authors.lastname: Acín