Physics – Quantum Physics
Scientific paper
2006-03-04
Phys. Rev. A 75, 012103 (2007)
Physics
Quantum Physics
9 pages, 2 figures. Version 2 significantly revised. Now includes a site-invariant protocol for linear chains and a proof that
Scientific paper
10.1103/PhysRevA.75.012103
We propose a communication-assisted local-hidden-variable model that yields the correct outcome for the measurement of any product of Pauli operators on an arbitrary graph state, i.e., that yields the correct global correlation among the individual measurements in the Pauli product. Within this model, communication is restricted to a single round of message passing between adjacent nodes of the graph. We show that any model sharing some general properties with our own is incapable, for at least some graph states, of reproducing the expected correlations among all subsets of the individual measurements. The ability to reproduce all such correlations is found to depend on both the communication distance and the symmetries of the communication protocol.
Barrett Jonathan
Caves Carlton M.
Eastin Bryan
Elliott Matthew B.
Pironio Stefano
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