Over the last several years, researchers have shown that it is possible to design clocks 1,000 times more precise than the atomic clocks that the original definition of the second is based on ...

The next generation of atomic clocks "ticks" with the frequency of a laser. This is about 100,000 times faster than the microwave frequencies of the cesium clocks which are generating the second ...

“The optical clock community is strongly motivated to obtain the best possible set of measurements before the SI second is ...

Nuclear clocks could rival atomic clocks and allow for new tests of fundamental physics. A new experiment demonstrates all the ingredients needed.

Atomic clocks use these frequencies — specifically, absorbing and emitting photons at regular intervals to keep time. They are the most accurate clock we have to measure time in seconds.

New atomic clocks are more accurate than those used to define the second, suggesting the definition might need to change ...

Scientists working with an early version of the cesium atomic clock in 1959. Leap seconds have been used to keep atomic time and astronomical time in sync.

Even guardians of America's atomic clocks say time doesn't work the way we think it does.

They're called hydrogen masers, and they are extremely important atomic clocks. Along with around 400 others, placed all around the globe, they help the world define what time it is, right now ...

Multi-Ion Optical Atomic Clock Takes A Step Towards Changing The Definition Of A Second The breakthrough has applications from metrology to dealing with the consequences of climate change.

They're called hydrogen masers, and they are extremely important atomic clocks. Along with around 400 others, placed all around the globe, they help the world define what time it is, right now ...