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Certification of non-classicality in all links of a photonic star network without assuming quantum mechanics

Wang, Ning Ning (author)
University of Science and Technology of China
Pozas-Kerstjens, Alejandro (author)
Zhang, Chao (author)
University of Science and Technology of China
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Liu, Bi Heng (author)
University of Science and Technology of China
Huang, Yun Feng (author)
University of Science and Technology of China
Li, Chuan Feng (author)
University of Science and Technology of China
Guo, Guang Can (author)
University of Science and Technology of China
Gisin, Nicolas (author)
University of Geneva
Tavakoli, Armin (author)
Lund University,Lunds universitet,Matematisk fysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Mathematical Physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH,Austrian Academy of Sciences
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 (creator_code:org_t)
2023
2023
English.
In: Nature Communications. - 2041-1723. ; 14:1
  • Journal article (peer-reviewed)
Abstract Subject headings
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  • Networks composed of independent sources of entangled particles that connect distant users are a rapidly developing quantum technology and an increasingly promising test-bed for fundamental physics. Here we address the certification of their post-classical properties through demonstrations of full network nonlocality. Full network nonlocality goes beyond standard nonlocality in networks by falsifying any model in which at least one source is classical, even if all the other sources are limited only by the no-signaling principle. We report on the observation of full network nonlocality in a star-shaped network featuring three independent sources of photonic qubits and joint three-qubit entanglement-swapping measurements. Our results demonstrate that experimental observation of full network nonlocality beyond the bilocal scenario is possible with current technology.

Subject headings

NATURVETENSKAP  -- Fysik -- Annan fysik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Other Physics Topics (hsv//eng)

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