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Area of Science:

  • High-energy particle physics
  • Quantum mechanics
  • Quantum entanglement

Background:

  • Top-quark spin correlations at colliders offer a unique window into fundamental physics.
  • Quantum entanglement, a key quantum phenomenon, has not been extensively probed at high energies.
  • Bell inequalities provide a framework for testing the foundations of quantum mechanics.

Purpose of the Study:

  • To demonstrate a novel method for testing Bell inequality violations using top-quark spin correlations.
  • To assess the feasibility of this test with current and future collider data.
  • To explore quantum entanglement at unprecedented energy scales.

Main Methods:

  • Utilizing spin correlations of top-quark pairs produced at a particle collider.
  • Measuring a single, carefully chosen observable.
  • Accounting for detector effects such as acceptance, efficiency, and migration.

Main Results:

  • A single observable measurement can test Bell inequality violation at 98% confidence level with current Large Hadron Collider data.
  • This test can achieve 99.99% confidence level with increased luminosity in future runs.
  • The method relies solely on spin correlations, bypassing the need for probability determination.

Conclusions:

  • The proposed method provides a robust and novel way to probe quantum entanglement.
  • This approach is experimentally viable with existing and upcoming collider data.
  • It opens new avenues for exploring quantum foundations at high energy scales.