Experimental demonstration of genuine tripartite nonlocality under strict locality conditions

Abstract

Nonlocality captures one of the counterintuitive features of nature that defies classical intuition. Recent investigations reveal that our physical world's nonlocality is at least tripartite; i.e., genuinely tripartite nonlocal correlations in nature cannot be reproduced by any causal theory involving bipartite nonclassical resources and unlimited shared randomness. Here, by allowing the fair sampling assumption and postselection, we experimentally demonstrate such genuine tripartite nonlocality in a network under strict locality constraints that are ensured by spacelike separating all relevant events and employing fast quantum random number generators and high-speed polarization measurements. In particular, for a photonic quantum triangular network we observe a locality-loophole-free violation of the Bell-type inequality by 7.57 standard deviations for a postselected tripartite Greenberger-Horne-Zeilinger state of fidelity $(93.13\pm 0.24)\%$, which convincingly disproves the possibility of simulating genuine tripartite nonlocality by bipartite nonlocal resources with globally shared randomness.

arXiv comment6 pages, 3 figures

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• Photonic source of heralded GHZ states
• Multipartite Intrinsic Non-Locality and Device-Independent Conference Key Agreement
• A Hierarchy of Multipartite Nonlocality and Device-Independent Effect Witnesses
• Consequences of the single-pair measurement of the Bell parameter
• The transfer of nonlocality between two- and three-qubit dissipative systems with counter-rotating-wave terms
• Quantum Zeno Effect on Genuine Tripartite Nonlocality and Entanglement in Quantum Dissipative System
• Testing Genuine Multipartite Nonlocality via an Inflated Network with Multi-copy Entangled States
• Consistency and Causality of Interconnected Nonsignaling Resources
• Strength of statistical evidence for genuine tripartite nonlocality