• Accepted Paper

Almost all pure entangled states enable unbounded nonlocality sharing

Anna Steffinlongo, Nicola D’Alessandro, and Martin J. Renner

Phys. Rev. Lett. - Accepted 20 October, 2026

DOI: https://doi.org/10.1103/pvcy-pc82

Abstract

We establish a connection between Hardy paradox and nonlocality sharing in sequential bipartite scenarios, where each subsystem is measured in turn by a chain of observers. We show that any correlations exhibiting a Hardy paradox in the two-input two-output scenario enable sequential violations of the CHSH inequality between arbitrarily many pairs of observers, using only local-randomness-assisted projective measurements and the assistance of a small local ancilla system. Since almost all pure entangled states, with the only exception of the maximally entangled one, admit Hardy correlations, our protocol applies generically: almost all pure entangled states, if assisted by a local ancilla, allow for nonlocality sharing between arbitrarily many observer pairs using only local-randomness-assisted projective measurements.

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