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Area of Science:

  • Quantum Information Science
  • Quantum Foundations

Background:

  • Sequential sharing of quantum nonlocality is crucial for multiparty collaborative information processing.
  • Previous methods typically relied on unsharp measurements.

Purpose of the Study:

  • To experimentally demonstrate sequential sharing of quantum nonlocality using only projective measurements.
  • To explore the role of classical randomness in observing quantum nonlocality.

Main Methods:

  • Utilized projective measurements and classical randomness in a bipartite quantum system.
  • Extended the protocol to a tripartite system using Greenberger-Horne-Zeilinger states.
  • Experimentally prepared and measured three-photon entangled states.

Main Results:

  • Achieved sequential violations of the Clauser-Horne-Shimony-Holt inequality.
  • Observed sequential tripartite nonlocality with violations of the Mermin inequality.
  • Demonstrated that projective measurements are key to sequential nonlocality sharing.

Conclusions:

  • Projective measurements, combined with classical randomness, can realize sequential sharing of quantum nonlocality.
  • This provides a new experimental approach for measuring quantum nonlocality.
  • Opens technological pathways for distributed quantum networks.