Hardy's paradox as a demonstration of quantum irrealism

TL;DR

This paper revisits Hardy's paradox using new tools to quantify realism, arguing that quantum irrealism, rather than non-local causality, explains the paradox without inequalities.

Contribution

It introduces a quantitative assessment of realism to Hardy's paradox, challenging the necessity of non-local causality for its resolution.

Findings

Quantum irrealism explains Hardy's paradox without non-local causality.

New tools allow for a quantitative measure of realism in quantum phenomena.

Hardy's paradox can be understood through irrealism alone.

Abstract

Hardy's paradox was originally presented as a demonstration, without inequalities, of the incompatibility between quantum mechanics and the hypothesis of local causality. Equipped with newly developed tools that allow for a quantitative assessment of realism, here we revisit Hardy's paradox and argue that non-local causality is not mandatory for its solution; quantum irrealism suffices.