A team of researchers has demonstrated the ultimate sensitivity allowed by quantum physics in measuring the time delay between two photons. This breakthrough has significant implications for a range ...

Measuring time might not seem like that complex of a thing. After all, we rely on simply counting seconds between the "then" and the "now." But when you really start to break time down to the quantum ...

Superradiant atoms can help us measure time more precisely than ever. In a new study, researchers present a new method for measuring the time interval, the second, mitigating some of the limitations ...

America's official time is kept at a government laboratory in Boulder, Colo., and according to the clock at the entrance, I was seven minutes behind schedule. I rush across the campus of the National ...

Vittorio Aita does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond ...

To the world’s timekeepers, the leap second is a kludge, a bane, a pain in the little hand. Now they’re ditching it. Will our days ever be the same? “The Astronomer,” a 1668 painting by the Dutch ...

For centuries, measuring time was simple. A day was one full rotation of the earth, and a second, the smallest unit needed, was 1/86,400th of a day. But as scientists’ standards became more exacting, ...