The speed of light was a mystery for millennia, a fugitive constant that escaped measurement and understanding. Now among the ...

Black hole and Big Bang singularities break our best theory of gravity. A trilogy of theorems hints that physicists must go ...

The National Institute of Standards and Technology (NIST) has dramatically enhanced the precision of time measurement with ...

Quantum sensors could enable resilient U.S. PNT within a few years—but only if America continues to develop and deploy the ...

Over the decades, physicists have compiled various lists of the most important fundamental constants. Generally, there are a ...

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

From space, the Atomic Clock Ensemble in Space will link to some of the most accurate clocks on Earth to create a ...

The European Space Agency’s ACES mission could ultimately pave the way for a global network of atomic clocks that make these ...

With greater control over the quantum realm, physicists are poised to make major leaps in quantum computing, quantum gravity and more.

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.

A particle that lacks the energy to climb a barrier can still appear on the far side, a curiosity known as “quantum tunneling.” ...

resonator for application in a new type of chip-scale atomic clock (CSAC). Near the half-hyperfine frequency of 133 Cs (4.596...GHz), the NTL oscillator provides a peak RF output power up to 14 dBm, ...