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Related Experiment Videos

Experimental entangled entanglement.

Philip Walther1, Kevin J Resch, Caslav Brukner

  • 1Institut für Experimentalphysik, Universität Wien, Boltzmanngasse 5, A-1090 Wien, Austria.

Physical Review Letters
|August 16, 2006
PubMed
Summary
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Researchers demonstrated "entangled entanglement" by violating a Bell inequality with three particles. This experiment shows correlations stronger than local realism allows, using entangled measurements alongside single-particle ones.

Area of Science:

  • Quantum Information Science
  • Foundations of Quantum Mechanics
  • Experimental Physics

Background:

  • Previous Bell tests relied on single-particle measurement correlations.
  • Local realism posits that physical reality is objective and local.

Purpose of the Study:

  • To test local realism using novel three-particle entangled measurements.
  • To investigate correlations between entangled and single-particle measurements.
  • To explore the phenomenon termed 'entangled entanglement'.

Main Methods:

  • Conducted a Bell experiment involving three particles.
  • Performed measurements including projection onto a maximally entangled state.
  • Theoretically and experimentally analyzed correlations.

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Main Results:

  • Demonstrated correlations exceeding the limits of local-realistic theories.
  • Violated a Clauser-Horne-Shimony-Holt-Bell inequality by over 5 standard deviations.
  • Confirmed the existence of 'entangled entanglement' experimentally.

Conclusions:

  • The results challenge local-realistic explanations of quantum mechanics.
  • Entangled measurements offer a new avenue for Bell tests.
  • Quantum correlations can be stronger than previously established.