title: Experimental test of the no-signaling theorem.
abstract: In 1981 N. Herbert proposed a gedanken experiment in order to achieve by the "First Laser-Amplified Superluminal Hookup" (FLASH) a faster-than-light (FTL) communication by quantum nonlocality. The present work reports the first experimental realization of that proposal by the optical parametric amplification of a single photon belonging to an entangled EPR pair into an output field involving N=5 x 10{3} photons. A theoretical and experimental analysis explains in general and conclusive terms the precise reasons for the failure of the FLASH program as well as of any similar FTL proposals.
authors.affiliation: Dipartimento di Fisica dell'Universitá La Sapienza and Consorzio Nazionale Interuniversitario per le Scienze Fisiche della Materia, Roma, Italy.
authors.forename: Tiziano
authors.initials: T
authors.lastname: De Angelis
authors.forename: Eleonora
authors.initials: E
authors.lastname: Nagali
authors.forename: Fabio
authors.initials: F
authors.lastname: Sciarrino
authors.forename: Francesco
authors.initials: F
authors.lastname: De Martini