Strong Loophole-Free Test of Local Realism
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Abstract
We present a loophole-free violation of local realism using entangled photon pairs. We ensure that all relevant events in our Bell test are spacelike separated by placing the parties far enough apart and by using fast random number generators and high-speed polarization measurements. A high-quality polarization-entangled source of photons, combined with high-efficiency, low-noise, single-photon detectors, allows us to make measurements without requiring any fair-sampling assumptions. Using a hypothesis test, we compute p values as small as 5.9×10^{-9} for our Bell violation while maintaining the spacelike separation of our events. We estimate the degree to which a local realistic system could predict our measurement choices. Accounting for this predictability, our smallest adjusted p value is 2.3×10^{-7}. We therefore reject the hypothesis that local realism governs our experiment.
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The record
- Venue
- Physical Review Letters
- Topic
- Quantum Mechanics and Applications
- Field
- Physics and Astronomy
- Canadian institutions
- Canadian Institute for Advanced ResearchUniversité de MonctonUniversity of Waterloo
- Funders
- European Research CouncilArmy Research OfficeNatural Sciences and Engineering Research Council of CanadaMultidisciplinary University Research InitiativeJet Propulsion LaboratoryDefense Advanced Research Projects AgencyH2020 Future and Emerging TechnologiesNational Institute of Standards and TechnologyAgricultural Research Development AgencyOffice of Naval ResearchIndustry CanadaEuropean Regional Development FundFundación CellexCalifornia Institute of TechnologyEuropean CommissionNew Brunswick Innovation FoundationNational Aeronautics and Space AdministrationDeutscher Akademischer AustauschdienstCanadian Institute for Advanced ResearchMinisterio de Economía y CompetitividadNational Science Foundation
- Keywords
- Test (biology)Quantum nonlocalityPhysicsRealismTheoretical physicsStatistical physicsQuantum mechanicsEpistemologyPhilosophyGeologyQuantum entanglement
- Has abstract in OpenAlex
- yes