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

Back in 2023, scientists were already puzzled by the Earth’s accelerating rotation, while some speculated that global warming ...

In this work, a rubidium fountain clock through an 84km commercial optical fiber link was used to steer the atomic time scale generated by a clock ensemble with 2 hydrogen masers and 8 high ...

Earth's rotation is speeding up, leading to shorter days and potential timekeeping adjustments. Scientists predict that by ...

We report on the development of a long-term laser diode aging test bench that measures the spectral behavior of laser diodes over several years, in view of their applications in space Rb atomic clocks ...

Edwin Lyman is the director of Nuclear Power Safety with the Union of Concerned Scientists’ Climate and Energy program. He is a co-author (with David Lochbaum and Susan Q. Stranahan) of the book ...

A Bulletin short fiction contest Announcing the Bulletin‘s new short fiction contest… Over the decades, the Bulletin of the Atomic Scientists has published the smartest minds in the fields it covers, ...

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

Iran's President Masoud Pezeshkian has given his approval to legislation halting collaboration with the UN's nuclear ...

The arrow of time can teach us more about how the universe began – and how it will end, says quantum columnist Karmela ...