15:00
16:00

Any Physical Theory of Nature Must Be Boundlessly Multipartite Nonlocal

[Note: no quantum background is needed to attend this talk]

Quantum correlations are obtained when multiple parties perform independent measurements on a shared quantum state.
I will fist do a pedestrian introduction to Bell’s seminal theorem (acknowledge by the last Physics Nobel price), which proves that some quantum correlations cannot be explain by any ‘Local Hidden Variable theory’: one cannot understand quantum correlations based on shared randomness.
But what about alternative explanations for quantum correlations? For instance, what happens if we try to explain quantum theory with shared randomness and ‘exotic bipartite resources’ (generalising quantum bipartite entanglement)?
With Xavier Coiteux-Roy and Elie Wolfe, we found that no such exotic theory can account for all quantum correlations as long as it satisfies ‘causality’, thus generalizing Bell's theorem.
In this talk, I will explain that result, which certifies the fact that ‘No Bipartite-Nonlocal Causal Theory Can Explain Nature's Quantum Correlations’.
I will also discuss the connections of this problem with distributed computing (e.g., arXiv:2212.02768): our proof is based on the inflation technic in which we assume the replicability of resources, showing that a concept commonly used in distributed computing is also of great interest in theoretical physics.

Based on arXiv:2105.09381, arXiv:2105.09380, arXiv:2201.12754

https://combalgo.labri.fr/pmwiki.php/Groupe/Info-Quantique

LaBRI