Bell's theorem allows local theories of quantum mechanics

TL;DR

This paper challenges a recent claim that hidden variable theories in quantum mechanics must be non-local, clarifying misconceptions about Bell's theorem and local theories.

Contribution

It corrects a misstatement in a Nature Physics editorial, reaffirming that local hidden variable theories are not necessarily incompatible with quantum mechanics.

Findings

Bell's theorem does not exclude all local hidden variable theories.

Misinterpretations can lead to incorrect conclusions about non-locality.

Clarification helps refine foundational understanding of quantum physics.

Abstract

A recent Nature Physics editorial (Nat. Phys. (2022) 18, 961) falsely claims ``any theory that uses hidden variables still requires non-local physics.'' We correct this claim and explain why it is important to get this right.