Quantum clocks break energy limits, unlocking ultra-precise timekeeping with far-reaching tech, AI, and navigation impacts.

You want your child to unwind. You want to avoid a meltdown. But you also want them to get the sleep they need.

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

He developed technologies that helped pave the way for the Global Positioning System and made foundational discoveries that ...

While the Standard Model (SM) describes all known fundamental particles and many of the interactions between them, it fails ...

Advances in technology to support AI and edge computing will likely drive a shift away from quartz timing toward silicon MEMS and precision timing.

Researchers have shown, for the first time, that transmission of ultrastable optical signals from optical clocks across tens of kilometers of deployed multicore fiber is compatible with ...

The ring clock. Credit: Nature Physics (2025). DOI: 10.1038/s41567-025-02929-2 Over the past decades, physicists have been trying to develop increasingly sophisticated and precise clocks to reliably ...

A new atomic clock is one of the world’s best timekeepers, researchers say — and after years of development, the “fountain”-style clock is now in use helping keep official U.S. time. Known ...

So precise is its rhythm that, had it been running when dinosaurs walked the Earth, it would only now be off by less than a second. NIST-F4 doesn’t just keep time. It defines it.

Unlike atomic clocks, which rely on electron transitions, this new clock is based on a low-energy transition within the nucleus of a thorium-229 atom. Because nuclear transitions are less affected by ...