A feasible quantum communication complexity protocol

Details A feasible quantum communication complexity protocol A feasible quantum communication complexity protocol

2001-06-21

arxiv.org/abs/quant-ph/0106121v2

Phys. Rev. A 65, 012318 (2002)

Physics

Quantum Physics

8 pages, LaTeX, no figures. v2: included analysis of other experimental losses, 3 more refs., other minor changes

Scientific paper

10.1103/PhysRevA.65.012318

I show that a simple multi-party communication task can be performed more efficiently with quantum communication than with classical communication, even with low detection efficiency $\eta$. 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 $\eta>0.33$ .

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