Indistinguishability as nonlocality constraint

TL;DR

This paper proposes that information indistinguishability of qubits and bits explains quantum nonlocality bounds, connecting it to the exclusivity principle and positioning it as a fundamental aspect alongside non-locality and causality.

Contribution

It introduces indistinguishability as a fundamental principle that constrains nonlocality, providing a new perspective on the origins of quantum bounds.

Findings

Indistinguishability leads to quantum bounds on nonlocality.

Connects indistinguishability with the exclusivity principle.

Positions indistinguishability as fundamental as non-locality and causality.

Abstract

A physical explanation for quantum bounds to nonlocality (Tsirelson's bound) is a fundamental problem that remains open, and one approach to explaining its origins is the so-called Exclusivity principle, relying on probabilistic assumptions shaping general probabilistic theories through sharp measurements and compatible (non-local) measurements. Information indistinguishability, presented here as indistinguishability of qubits and more general bits, may serve as an answer to the nonlocality conundrum, ultimately placing it as the origin to quantum limits. We connect indistinguishability to the exclusivity principle and show that indistinguishability leads to quantum bounds. With that, we suggest indistinguishability to be as fundamental as non-locality and relativistic causality for nonlocal realism.