English

Quantum measurement incompatibility does not imply Bell nonlocality

Quantum Physics 2018-02-02 v2

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 MA\mathcal{M}_A with the following property. Considering a bipartite Bell test where Alice uses MA\mathcal{M}_A, then for any possible shared entangled state ρ\rho and any set of (possibly infinitely many) POVMs NB\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.

Keywords

Cite

@article{arxiv.1707.06960,
  title  = {Quantum measurement incompatibility does not imply Bell nonlocality},
  author = {Flavien Hirsch and Marco Túlio Quintino and Nicolas Brunner},
  journal= {arXiv preprint arXiv:1707.06960},
  year   = {2018}
}

Comments

See also arXiv:1705.10069 for a related work Small changes on the main text. Some typos were fixed

R2 v1 2026-06-22T20:54:09.065Z