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Area of Science:

  • Quantum Information Science
  • Quantum Foundations
  • Quantum Networks

Background:

  • Genuine multipartite nonlocality and network nonlocality have been studied independently.
  • Verifying genuine multipartite nonlocality often requires violating multiple Bell inequalities.
  • Quantum networks with independent sources can certify the nonclassicality of all sources.

Purpose of the Study:

  • To develop the first method for simultaneously verifying genuine multipartite nonlocality and network nonlocality in a single experiment.
  • To explore quantum correlations in networks with mixed bipartite and tripartite sources.
  • To certify the nonclassicality of both genuine multipartite entangled states and the overall network structure.

Main Methods:

  • Proposed a quantum network model combining a bipartite source and a tripartite source.
  • Investigated quantum correlations that are unsimulatable by biseparable tripartite systems and stronger-than-quantum bipartite systems.
  • Conducted a high-fidelity photonic experiment to violate a single network Bell inequality.

Main Results:

  • Demonstrated quantum correlations that verify genuine multipartite nonlocality for generalized Greenberger-Horne-Zeilinger states.
  • Showcased the verification of full network nonlocality, surpassing existing results.
  • Experimentally observed both types of nonlocality simultaneously in a photonic quantum network.

Conclusions:

  • The proposed method successfully verifies both genuine multipartite nonlocality and network nonlocality in a single experimental setup.
  • This work advances the understanding and experimental verification of complex quantum correlations in multipartite systems and networks.
  • The findings pave the way for more robust certification of quantum devices and protocols in complex quantum network architectures.