The strange quantum nature of time moves one step closer to being untangled, thanks to new research on optical ion clocks.

Former New York City Mayor Rudy Giuliani has been hospitalized, according to a statement posted on Sunday. Giuliani is in critical but stable condition. 85-year-old shot daughter, wife and himself; ...

To find out how clock accuracy is verified and which reference is used for comparison, we visited the Belarusian State Institute of Metrology (BelGIM), where most of the national standards are kept.

Physicists have found that certain quantum collapse models, if correct, imply an inherent uncertainty in time itself, likely ...

For many years, cesium atomic clocks have been reliably keeping time around the world. But the future belongs to even more accurate clocks: optical atomic clocks. In a few years' time, they could ...

Time is almost up on the way we track each second of the day, with optical atomic clocks set to redefine the way the world measures one second in the near future. Researchers from Adelaide University ...

Chinese breakthrough in ultraviolet crystals could lead to navigation systems resistant to jamming ...

Smaller version Illustration of a conventional atomic fountain clock (left) next to NPL’s miniature atomic fountain clock. (Courtesy: NPL) A miniature version of an atomic fountain clock has been ...