Sunlight produces polarization-entangled photons through SPDC, achieving concurrence 0.905, fidelity 0.939, and Bell violation S=2.54 exceeding the classical limit.
oxinst.com/assets/uploads/NanoScience/Brochures/Principles%20of% 20dilution%20refrigeration_Sept15.pdf, university of Oxford / Oxford Nanoscience brochure
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Generating quantum entanglement from sunlight
Sunlight produces polarization-entangled photons through SPDC, achieving concurrence 0.905, fidelity 0.939, and Bell violation S=2.54 exceeding the classical limit.