M. A. Solís-Prosser, G. B. Xavier, A. Delgado and G. Lima
Recently, a protocol for quantum state discrimination (QSD) in a multi-party scenario has been introduced [Phys. Rev. Lett. 111, 100501 (2013)]. In this protocol, Alice generates a quantum system in one of two pre-defined non-orthogonal qubit states, and the
goal is to send the generated state information to different parties without any classical communication between them. The interesting feature is that, by resorting to sequential generalized measurements onto this system, there is a non-vanishing probability that all bservers identify the state prepared by Alice. Here, we present the experimental implementation of this protocol based on polarization single-photon states. Our scheme works over a linear optical network, and since QSD lies in the core of many protocols, it represents a step towards experimental multi-party quantum information processing.