Determining the passage of time in our world of ticking clocks and oscillating pendulums is a simple case of counting the seconds between 'then' and 'now'. Down at the quantum scale of buzzing ...

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 ...

Scientists have developed a novel interferometric technique capable of measuring time delays with zeptosecond (a trillionth of a billionth of a second) resolution. They have used this technique to ...

How do we measure time? Technically, by the oscillations of a cesium atom. This film tells a human story behind an element from the periodic table: cesium. “Three, two, one, go!” When I became a ...

Add Yahoo as a preferred source to see more of our stories on Google. A time lapse image of a clock's hands and face. Determining the passage of time in our world of ticking clocks and oscillating ...

Determining the passage of time in our world of ticking clocks and oscillating pendulums is a simple case of counting the seconds between 'then' and 'now'. Down at the quantum scale of buzzing ...