Two photons met on a semi-transparent mirror and... exited together, like synchronized dancers. If one is slightly late, the trick disappears. But physicists found a way to notice a delay as small as 4 picoseconds — a thousand times faster than an eye blink. This ushers in an era of quantum stopwatches for the networks of the future.
🎯 The idea of quantum interference of photons was first described by [scientist:Roy Glauber]Roy Glauber[/scientist], and experiments with entangled photons by [scientist:Anton Zeilinger]Anton Zeilinger[/scientist] laid the groundwork for ultra-precise measurements.