Quantum communication complexity advantage implies violation of a Bell inequality
We obtain a general connection between a large quantumadvantage in communication complexity and Bell nonlocality. We show that given any protocol offering a sufficiently large quantum advantage in communication complexity, there exists a way of obtaining measurement statistics that violate some Bell inequality. Our main tool is portbased teleportation. If the gap between quantum and classical communication complexity can grow arbitrarily large, the ratio of the quantum value to the classical value of the Bell quantity becomes unbounded with the increase in the number of inputs and outputs.
|Journal||Proceedings of the National Academy of Sciences of the United States of America|
|Grant||This work was funded by the The Netherlands Organisation for Scientific Research (NWO); grant id nwo/024.002.003 - Networks|
Buhrman, H.M, Czekaj, L, Grudka, A, Horodecki, M, Horodecki, P, Markiewicz, M, … Strelchuk, S. (2016). Quantum communication complexity advantage implies violation of a Bell inequality. Proceedings of the National Academy of Sciences of the United States of America, 113(12), 3191–3196. doi:10.1073/pnas.1507647113