Experimental Test of Quantum Nonlocality from Contextuality

TL;DR

This paper experimentally demonstrates quantum nonlocality derived from contextuality using orbital angular momentum entanglement, bridging two fundamental quantum resources crucial for quantum information processing.

Contribution

It provides the first experimental realization of Bell inequalities from contextuality in high-dimensional orbital angular momentum states.

Findings

Successful violation of Bell inequalities from contextuality using orbital angular momentum entanglement

Establishes a practical link between contextuality and non-locality in quantum systems

Shows potential for enhanced quantum communication and computation applications

Abstract

There are two powerful arguments against the possibility of extending quantum mechanics, the violation of Bell inequalities and the Kochen-Specker theorem, but the connection between the two remains confused. Following the distinctive strategy proposed by Cabello [Phys. Rev. Lett. 127, 070401 (2021)], Bell inequalities can be violated by state-independent contextuality sets. However, the experimental realization of such ideas is challenging as it requires high-dimensional entanglement. Orbital angular momentum provides an unlimited state space and the number of effective dimensions can be readily tailored as required. We performed an experimental test of non-locality based on Bell inequalities from contextuality, using orbital angular momentum entanglement in a bipartite photonic system. Our experiment not only shows a new way to produce non-locality but also connects contextuality and non-locality, two fundamental quantum resources that are critical for quantum computation and secure communication tasks.