Experimental Demonstration of Genuine Tripartite Nonlocality under Strict Locality Conditions

Liang Huang, Xue-Mei Gu, Yang-Fan Jiang, Dian Wu, Bing Bai, Ming-Cheng Chen, Qi-Chao Sun, Jun Zhang, Sixia Yu, Qiang Zhang, Chao-Yang Lu, and Jian-Wei Pan
Phys. Rev. Lett. 129, 060401 – Published 2 August 2022
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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±0.24)%, which convincingly disproves the possibility of simulating genuine tripartite nonlocality by bipartite nonlocal resources with globally shared randomness.

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  • Received 7 March 2022
  • Revised 10 May 2022
  • Accepted 11 July 2022

DOI:https://doi.org/10.1103/PhysRevLett.129.060401

© 2022 American Physical Society

Physics Subject Headings (PhySH)

General PhysicsQuantum Information, Science & Technology

Authors & Affiliations

Liang Huang1,2,3,*, Xue-Mei Gu1,2,3,*, Yang-Fan Jiang4,*, Dian Wu1,2,3, Bing Bai1,2,3, Ming-Cheng Chen1,2,3, Qi-Chao Sun1,2,3, Jun Zhang1,2,3, Sixia Yu1, Qiang Zhang1,2,3, Chao-Yang Lu1,2,3, and Jian-Wei Pan1,2,3

  • 1Hefei National Research Center for Physical Sciences at the Microscale and School of Physical Sciences, University of Science and Technology of China, Hefei 230026, China
  • 2Shanghai Research Center for Quantum Science and CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Shanghai 201315, China
  • 3Hefei National Laboratory, University of Science and Technology of China, Hefei 230088, China
  • 4Jinan Institute of Quantum Technology, Jinan 250101, China

  • *These authors contributed equally to this work.

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Issue

Vol. 129, Iss. 6 — 5 August 2022

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