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Research dossier · version 1 · updated Oct 30, 2026

Quantum Foundations: State of the Field (October 2026)

This dossier surveys quantum foundations as of October 2026: loophole-free Bell tests, contextuality, extended Wigner's friend arguments and experimental bounds on spontaneous collapse models. The main takeaway is that nonlocality is well established under loophole-free conditions, while the measurement problem and the status of collapse models remain open.

3,333 words42 sources28 evidence-mapped claims9 benchmarks15 timeline events✓ citation-verified Oct 30, 2026

AI-assisted synthesis of the cited literature, independently fact-checked against its sources; not peer reviewed.

Contents

  1. Executive summary
  2. Background and core concepts
  3. Timeline of key milestones
  4. State of the art
  5. Loophole-free Bell tests
  6. Device-independent applications
  7. Contextuality and nonlocality
  8. Extended Wigner's friend arguments
  9. Collapse models and experimental bounds
  10. Quantitative benchmarks
  11. Open problems and active debates
  12. Major programs and players
  13. Outlook: what to watch (next 12-18 months)
  14. Key papers
  15. Glossary

Sample findings

  • Hensen et al. reported a loophole-free Bell violation using entangled electron spins in diamond separated by 1.3 km; a 2016 paper describes this as the first loophole-free evidence against local-realist theories.
  • In 2015, one photonic test was reported as strong loophole-free (Shalm et al., with all relevant events spacelike separated) and another as significant-loophole-free (Giustina et al.), both violating local realism.
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