A new generation of optical atomic clocks, some accurate enough to lose less than a second over the entire age of the universe, is driving an international push to replace the cesium-based definition ...

Chinese scientists have engineered a clock so accurate it could lead to a redefinition of the second and an ultraprecise global time standard. The new optical clock is so accurate that it loses or ...

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 at ...