Experimental quantum communication complexity
arXiv:quant-ph/0502066 · doi:10.1103/PhysRevA.72.050305
Abstract
We prove that the fidelity of two exemplary communication complexity protocols, allowing for an N-1 bit communication, can be exponentially improved by N-1 (unentangled) qubit communication. Taking into account, for a fair comparison, all inefficiencies of state-of-the-art set-up, the experimental implementation outperforms the best classical protocol, making it the candidate for multi-party quantum communication applications.
4 pages, 2 eps figures, RevTEX4; submitted June 23, 2004