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Quantum measurement incompatibility does not imply Bell nonlocality

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arxiv 1707.06960 v2 pith:RHX57KGA submitted 2017-07-21 quant-ph

classification quant-ph
keywords bellincompatibilitymathcalquantumimplymeasurementnonlocalitypovms
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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 $\rho$ 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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