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Quantum Foundations
Quantum measurement incompatibility does not imply Bell nonlocality
arXiv
Authors: Flavien Hirsch, Marco Túlio Quintino, Nicolas Brunner
Year
2017
Paper ID
44463
Status
Preprint
Abstract Read
~2 min
Abstract Words
104
Citations
N/A
Abstract
We discuss the connection between the incompatibility of quantum measurements, as captured by the notion of joint measurability, and the violation of Bell inequalities. Specifically, we present explicitly a given a set of non jointly measurable POVMs mathcal{M}A with the following property. Considering a bipartite Bell test where Alice uses mathcal{M}A, then for any possible shared entangled state ρ and any set of (possibly infinitely many) POVMs mathcal{N}B performed by Bob, the resulting statistics admits a local model, and can thus never violate any Bell inequality. This shows that quantum measurement incompatibility does not imply Bell nonlocality in general.
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