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Bell correlations in a Bose-Einstein condensate.

Roman Schmied1, Jean-Daniel Bancal2, Baptiste Allard1

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Summary
This summary is machine-generated.

Researchers detected stronger-than-entanglement Bell correlations in a Bose-Einstein condensate of 480 atoms. This demonstrates that the strongest quantum correlations are experimentally accessible in many-body systems.

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Area of Science:

  • Quantum Physics
  • Atomic Physics
  • Condensed Matter Physics

Background:

  • Characterizing quantum correlations is crucial for understanding many-body systems.
  • Entanglement is a well-known quantum correlation, but stronger forms may exist.
  • Bose-Einstein condensates provide a platform for studying quantum phenomena.

Purpose of the Study:

  • To detect and characterize Bell correlations, a stronger form of quantum correlation, in a many-body system.
  • To demonstrate the experimental accessibility of the strongest possible nonclassical correlations.

Main Methods:

  • Derivation of a Bell correlation witness from a many-particle Bell inequality.
  • Measurement of spin correlations in a Bose-Einstein condensate of approximately 480 atoms.
  • Utilizing a spin-squeezed state for enhanced sensitivity.

Main Results:

  • Detection of Bell correlations between atomic spins in the Bose-Einstein condensate.
  • The measurement exceeded the Bell correlation threshold by 3.8 standard deviations.
  • The correlations observed were stronger than typical entanglement.

Conclusions:

  • Bell correlations are experimentally accessible in many-body systems.
  • Collective measurements can reveal these strong nonclassical correlations.
  • This opens new avenues for exploring quantum phenomena in macroscopic quantum systems.