Every nontrivial tight correlation Bell inequality for bipartite binary-outcome systems is violated by some quantum strategy.
Non-closure of the set of quantum correlations via graphs
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abstract
We prove that the set of quantum correlations for a bipartite system of 5 inputs and 2 outputs is not closed. Our proof relies on computing the correlation functions of a graph, which is a concept that we introduce.
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quant-ph 1years
2019 1verdicts
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All tight correlation Bell inequalities have quantum violations
Every nontrivial tight correlation Bell inequality for bipartite binary-outcome systems is violated by some quantum strategy.