USTC Achieves First Loophole-Free Test of Hardy's Paradox

https://en.physics.ustc.edu.cn/_t285/2024/0920/c7856a654003/page.htm

"demonstrated Hardy’s nonlocality, closes detection efficiency loophole (optical losses), locality loophole (measurement choices could affect outcomes)... quantum mechanics prediction that where 3 Hardy events have 0 probability, non-0 probability for 4th, contradicting local realism... significance level of up to 5 standard deviations across 4.32 billion trials... deepens quantum mechanics understanding/ developing quantum technologies (quantum key distribution, quantum random number certification)"