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.

6 pages, 3 figures

References in corpus (15)

• Device-independent security of quantum cryptography against collective attacks
• Certified randomness in quantum physics
• Loopholes in Bell Inequality Tests of Local Realism
• How good must single photon sources and detectors be for efficient linear optical quantum computation?
• Direct generation of three-photon polarization entanglement
• Theory-independent limits on correlations from generalised Bayesian networks
• Experimental violation of Svetlichny's inequality
• Experimental refutation of real-valued quantum mechanics under strict locality conditions
• Any Physical Theory of Nature Must Be Boundlessly Multipartite Nonlocal
• Experimental Demonstration that No Tripartite-Nonlocal Causal Theory Explains Nature's Correlations
• Genuine multipartite nonlocality with causal-diagram postselection
• Phase-stable source of high-quality three-photon polarization entanglement by cascaded downconversion
• Ruling out Bipartite Nonsignaling Nonlocal Models for Tripartite Correlations
• Generalizations of Boxworld
• Test to separate quantum theory from non-signaling theories

Cited by in corpus (9)

• 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