Unless, of course, you work at CERN and built “the most accurate pendulum clock ... With access to a 10-MHz timebase from a cesium fountain atomic clock — no less a clock than the one ...

The new clock is so reliable that it would be off by less than a second if it had started running 100 million years ago, ...

These optical clocks are still being assessed, but already now, some are 100 times more accurate than cesium clocks. They will therefore become the future basis for the worldwide definition of the ...

But cesium clocks are no longer the most accurate clocks available. In the past five years the world’s most advanced atomic clocks have reached a critical milestone by taking measurements that ...

They are the most accurate clock we have to measure time in seconds. A common kind of atomic clock uses a form of cesium called cesium-133. In this case, microwave energy interacts with atoms ...

A new atomic clock at the National Institute of Standards and Technology in Boulder is helping researchers count seconds to ...

Cesium fountain clocks such as NIST-F4 are a type of atomic ... This month, the NIST team reported that NIST-F4's frequency measurements were accurate to within 2.2 parts in 10 to the 16th ...

which carries a price tag of 500 million yen ($3.3 million), is up to 100 times more precise than the cesium atomic clock that is currently used for time definition. But super accuracy is not the ...

That is around 100,000 times faster than the microwave frequencies of the caesium clocks that currently generate the second. These optical clocks are still in the testing phase, but some of them are ...