Ming-Han Li, USTC, Shanghai
Researchers created entangled photon pairs and distributed the two photons of each pair to two measurement stations in opposite directions. At each measurement station, a telescope received the photons from the selected cosmic radiation source, which is at least 11 light-years from Earth. The cosmic photon detection signals generate random bits for measurement setting choices for the loophole-free Bell test. In this experiment, the researchers closed detection and locality loopholes, and pushed the time constraint to rule out local hidden variable models to 11 years before the experiment.