The experiment was pictured drawing a fiber Sagnac interferometric scheme inside a magnifying inset starting from a local position (Vienna, Austria) of the rotating Earth. Two indistinguishable photons are incident on a beam splitter cube, entanglement between them is created, and then they are coupled in the fiber interferometer. Credit: Marco Di Vita A team of researchers led by Philip Walther at the University of Vienna carried out a pioneering experiment where they measured the effect of the...