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Woodward–Hoffmann Selection Rules and Microscopic Reversibility01:34

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Electrocyclic reactions, cycloadditions, and sigmatropic rearrangements are concerted pericyclic reactions that proceed via a cyclic transition state. These reactions are stereospecific and regioselective. The stereochemistry of the products depends on the symmetry characteristics of the interacting orbitals and the reaction conditions. Accordingly, pericyclic reactions are classified as either symmetry-allowed or symmetry-forbidden. Woodward and Hoffmann presented the selection criteria for...
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Strong Loophole-Free Test of Local Realism.

Lynden K Shalm1, Evan Meyer-Scott2, Bradley G Christensen3

  • 1National Institute of Standards and Technology, 325 Broadway, Boulder, Colorado 80305, USA.

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This study demonstrates a loophole-free violation of local realism using entangled photons. The experiment confirms quantum mechanics predictions by rejecting local realism, a significant advancement in quantum physics research.

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Area of Science:

  • Quantum Physics
  • Fundamental Physics
  • Quantum Information Science

Background:

  • Local realism, a cornerstone of classical physics, posits that physical properties are definite and local.
  • Bell's theorem provides a framework to experimentally test local realism against quantum mechanics.
  • Previous experiments have faced 'loopholes' that could allow for local realistic explanations.

Purpose of the Study:

  • To perform a loophole-free violation of local realism.
  • To test the predictions of quantum mechanics in a regime free from experimental artifacts.
  • To provide strong evidence against local realistic theories.

Main Methods:

  • Utilized a high-quality source of polarization-entangled photon pairs.
  • Ensured spacelike separation of measurement events using distance and fast random number generators.
  • Employed high-efficiency, low-noise single-photon detectors for precise measurements.
  • Performed hypothesis testing to calculate p-values for Bell violations.

Main Results:

  • Achieved a loophole-free violation of local realism with p-values as low as 5.9×10⁻⁹.
  • Maintained spacelike separation throughout the experiment.
  • After accounting for measurement predictability, the adjusted p-value was 2.3×10⁻⁷.
  • Rejected the hypothesis that local realism governs the experimental outcomes.

Conclusions:

  • The experiment provides definitive evidence against local realism.
  • Confirms the non-classical nature of quantum mechanics.
  • Opens avenues for future quantum technologies based on non-local quantum correlations.