Feasible quantum communication complexity protocol
Ernesto F. Galvão · Physical Review A · 2001
I show that a simple multiparty communication task can be performed more efficiently with quantum communication than with classical communication, even with low detection efficiency $\ensuremath{\eta}.$ The task is a communication complexity problem in which distant parties need to compute a function of the distributed inputs, while minimizing the amount of communication between them. A realistic quantum optical setup is suggested that can demonstrate a five-party quantum protocol with higher-than-classical performance, provided \ensuremath{\eta}>0.33.