Científicos detienen la luz por un eterno minuto...

Light completely stopped for a record-breaking minute - physics-math - 25 July 2013 - New Scientist

To break the minute barrier, George Heinze and colleagues at the University of Darmstadt, Germany, fired a control laser at an opaque crystal, sending its atoms into a quantum superposition of two states. This made it transparent to a narrow range of frequencies. Heinze's team then halted a second beam that entered the crystal by switching off the first laser and hence the transparency.