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Relativistic independence bounds nonlocality.

Avishy Carmi1, Eliahu Cohen2

  • 1Faculty of Engineering and Center for Quantum Information Science and Technology, Ben-Gurion University of the Negev, Beersheba 8410501, Israel.

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Researchers explored if nature allows correlations beyond quantum mechanics. They found that theories with stronger nonlocal correlations violate generalized uncertainty relations or allow tampering with peers

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Area of Science:

  • Quantum Information Theory
  • Foundations of Physics
  • Nonlocality and Uncertainty Relations

Background:

  • Existing approaches struggle to fully characterize quantum nonlocality in simple scenarios.
  • The need to identify fundamental principles distinguishing quantum correlations from hypothetical stronger nonlocal correlations.

Purpose of the Study:

  • To investigate whether hypothetical nonlocal correlations beyond quantum mechanics contradict fundamental physical principles.
  • To develop new characterizations of quantum correlations using generalized uncertainty relations and a specific notion of locality.

Main Methods:

  • Utilizing generalized uncertainty relations to constrain nonlocal correlations.
  • Introducing and analyzing the condition of 'relativistic independence' for uncertainty relations.
  • Proving implications for theories with correlations stronger than quantum ones.

Main Results:

  • Generalized uncertainty relations and a specific notion of locality provide new ways to characterize quantum correlations.
  • The condition of relativistic independence is identified, ensuring uncertainty relations are locally determined.
  • Theories with stronger-than-quantum nonlocal correlations violate relativistic independence.

Conclusions:

  • Theories exhibiting nonlocal correlations stronger than quantum mechanics either violate generalized uncertainty relations or relativistic independence.
  • This work provides a framework for singling out quantum nonlocality based on fundamental principles.
  • The findings have implications for understanding the boundaries of physical theories and the nature of quantum information.