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Researchers developed an efficient method to test Bell nonlocality in complex quantum systems. This approach overcomes computational challenges, enabling new many-body Bell inequality discoveries.

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Area of Science:

  • Quantum Information Science
  • Condensed Matter Physics

Background:

  • Bell nonlocality challenges classical physics by showing entangled particles lack independent objective properties.
  • Probing Bell nonlocality in many-body systems is computationally intensive, hindering research.

Purpose of the Study:

  • To develop an efficient computational method for detecting Bell nonlocality in many-body quantum systems.
  • To identify the strongest many-body Bell inequalities violated by quantum data.

Main Methods:

  • A variational scheme based on solving inverse classical Ising problems.
  • Polynomial-time computation to assess compatibility of quantum data with local theories.

Main Results:

  • An efficient method to probe Bell nonlocality in polynomial time.
  • Discovery of new many-body Bell inequalities.
  • Demonstrated violation of these inequalities using quantum states of Heisenberg antiferromagnets.

Conclusions:

  • The proposed method efficiently probes Bell nonlocality in many-body systems.
  • Enables systematic experimental tests of Bell inequalities in complex quantum systems.
  • Opens new avenues for exploring quantum entanglement in larger systems.