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Area of Science:

  • Quantum Information Science
  • Quantum Foundations
  • Experimental Quantum Physics

Background:

  • Network nonlocality with multiple independent sources exhibits unique phenomena beyond standard Bell scenarios.
  • Previous demonstrations of network nonlocality, like entanglement swapping, could not certify the nonclassicality of their sources.
  • Full network nonlocality is a stronger concept required to certify nonclassicality in network scenarios.

Purpose of the Study:

  • To experimentally observe and certify full network nonlocal correlations.
  • To close the source-independence, locality, and measurement-independence loopholes in network nonlocality experiments.
  • To demonstrate the absence of classical sources in a network nonlocality realization.

Main Methods:

  • Utilizing two independent quantum sources to establish network correlations.
  • Implementing rapid random setting generation for measurements.
  • Ensuring spacelike separation between relevant events to close locality loopholes.

Main Results:

  • Experimental observation of full network nonlocal correlations.
  • Violation of inequalities characterizing nonfull network nonlocal correlations by over 5 standard deviations.
  • Certification of the nonclassical nature of the quantum sources used.

Conclusions:

  • The experiment successfully demonstrates full network nonlocality under stringent loophole-free conditions.
  • This work provides a robust method for certifying the nonclassicality of quantum resources in complex network setups.
  • The findings advance our understanding of quantum correlations in multipartite quantum networks.