Experimental Demonstration of Quantum Pseudotelepathy

TL;DR

This paper reports an experimental demonstration of quantum pseudotelepathy using hyperentangled photons to win a non-local magic square game with certainty, showcasing quantum nonlocality beyond statistical advantage.

Contribution

It provides the first faithful experimental demonstration of quantum pseudotelepathy via a hyperentanglement scheme in the Mermin-Peres magic square game.

Findings

Quantum players can win all game queries simultaneously.

Hyperentanglement enables resource-efficient implementation.

Results confirm quantum nonlocality with certainty.

Abstract

Quantum pseudotelepathy is a strong form of nonlocality. Different from the conventional non-local games where quantum strategies win statistically, e.g., the Clauser-Horne-Shimony-Holt game, quantum pseudotelepathy in principle allows quantum players to with probability 1. In this work, we report a faithful experimental demonstration of quantum pseudotelepathy via playing the non-local version of Mermin-Peres magic square game, where Alice and Bob cooperatively fill in a 3 by 3 magic square. We adopt the hyperentanglement scheme and prepare photon pairs entangled in both the polarization and the orbital angular momentum degrees of freedom, such that the experiment is carried out in a resource-efficient manner. Under the locality and fair-sampling assumption, our results show that quantum players can simultaneously win all the queries over any classical strategy.