Experimental full network nonlocality with independent sources and strict locality constraints

• URL: http://arxiv.org/abs/2302.02472v2
• Date: Fri, 12 May 2023 22:08:25 GMT
• Title: Experimental full network nonlocality with independent sources and strict locality constraints
• Authors: Xue-Mei Gu, Liang Huang, Alejandro Pozas-Kerstjens, Yang-Fan Jiang, Dian Wu, Bing Bai, Qi-Chao Sun, Ming-Cheng Chen, Jun Zhang, Sixia Yu, Qiang Zhang, Chao-Yang Lu, Jian-Wei Pan
• Abstract summary: Nonlocality in networks gives rise to phenomena radically different from that in standard Bell scenarios. We experimentally observe full network nonlocality in a network where the source-independence, locality, and measurement-independence loopholes are closed. Our experiment violates known inequalities characterizing non-full network nonlocal correlations by over five standard deviations.
• Score: 59.541438315564854
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Nonlocality arising in networks composed of several independent sources gives rise to phenomena radically different from that in standard Bell scenarios. Over the years, the phenomenon of network nonlocality in the entanglement-swapping scenario has been well investigated and demonstrated. However, it is known that violations of the so-called bilocality inequality used in previous experimental demonstrations cannot be used to certify the non-classicality of their sources. This has put forward a stronger concept for nonlocality in networks, called full network nonlocality. Here, we experimentally observe full network nonlocal correlations in a network where the source-independence, locality, and measurement-independence loopholes are closed. This is ensured by employing two independent sources, rapid setting generation, and space-like separations of relevant events. Our experiment violates known inequalities characterizing non-full network nonlocal correlations by over five standard deviations, certifying the absence of classical sources in the realization.

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