Black Holes Bolster Case For Quantum Physics' Spooky Action

Dust partially obscures a distant quasar in this artist's illustration. (Credit: NASA/ESA/G.Bacon, STScI) With the help of two extremely bright quasars located more than 7 billion light-years away, researchers recently bolstered the case for quantum entanglement — a phenomenon Einstein described as "spooky action at a distance" — by eliminating one classical alternative: The freedom-of-choice loophole.