In 2015 , a loophole - free Bell violation was reported using entangled diamond spins over 1.3 km .
In 2015 , a loophole - free Bell violation was corroborated by two experiments using entangled photon pairs .
In 2015 , a loophole - free Bell violation was reported using entangled diamond spins over 1.3 km and corroborated by two experiments using entangled photon pairs .