title: Tight multipartite Bell's inequalities involving many measurement settings.
abstract: We derive tight Bell's inequalities for N>2 observers involving more than two alternative measurement settings. We give a necessary and sufficient condition for a general quantum state to violate the new inequalities. The inequalities are violated by some classes of states, for which all standard Bell's inequalities with two measurement settings per observer are satisfied.
authors.affiliation: Instytut Fizyki Teoretycznej i Astrofizyki, Uniwersytet Gdański, PL-80-952 Gdańsk, Poland.
authors.forename: Wiesław
authors.initials: W
authors.lastname: Laskowski
authors.forename: Tomasz
authors.initials: T
authors.lastname: Paterek
authors.forename: Marek
authors.initials: M
authors.lastname: Zukowski
authors.forename: Caslav
authors.initials: C
authors.lastname: Brukner