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Researchers show genuine multipartite nonlocality (GMN) can be demonstrated even with collective postselection strategies. This advances quantum privacy and technology by enabling GMN with independent particle sources.

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Area of Science:

  • Quantum Information Science
  • Fundamental Physics

Background:

  • Genuine multipartite nonlocality (GMN) is crucial for quantum technologies like quantum privacy.
  • Demonstrating GMN typically involves postselecting measurement data, but valid strategies were limited to local postselection.

Purpose of the Study:

  • To establish conditions for demonstrating GMN with collective postselection strategies.
  • To explore if communication-assisted postselection can still prove GMN.

Main Methods:

  • Utilized the causal structure of experiments.
  • Applied the no-signaling condition imposed by relativity.
  • Analyzed postselection strategies involving communication between parties.

Main Results:

  • GMN can be demonstrated even when observations are collectively postselected.
  • Certain communication-dependent postselection strategies still allow for the demonstration of GMN shared among all parties.
  • Genuine three-partite nonlocality can be generated using independent particle sources.

Conclusions:

  • Collective postselection does not preclude the demonstration of genuine multipartite nonlocality.
  • New avenues for creating and verifying GMN are opened, with implications for quantum communication and computation.