Test of the physical significance of Bell non-locality

DIPC Seminars

Speaker: Adan Cabello
Universidad de Sevilla
When: 2025/10/10
18:00
Place: DIPC Josebe Olarra Seminar Room
Host: Geza Giedke
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Test of the physical significance of Bell non-locality

Loophole-free violations of Bell inequalities imply that at least one of the assumptions behind local hidden-variable theories must fail. Here, we show that, if only one fails, then it has to fail completely, therefore excluding models that partially constrain freedom of choice or allow for partial retrocausal influences, or allow partial instantaneous actions at a distance. Specifically, we show that (i) any hidden-variable theory with outcome independence (OI) and arbitrary joint relaxation of measurement independence (MI) and parameter independence (PI) can be experimentally excluded in a Bell-like experiment with many settings on high-dimensional entangled states, and
(ii) any hidden-variable theory with MI, PI and arbitrary relaxation of OI can be excluded in a Bell-like experiment with many settings on qubit-qubit entangled states.

Reference:
Vieira, Ramanathan, Cabello, Nature Communications 16, 4390 (2025)
arXiv:2402.00801