Atomic - Clock

The best modern atomic clocks are so stable that they wouldn't lose or gain a single second in —a span of time longer than the age of the universe.

If the microwave frequency is exactly right, the atoms change states. Atomic Clock

You likely interact with atomic clocks every day without realizing it: The best modern atomic clocks are so stable

High-speed data transfers and cellular networks require perfectly synchronized "stamps" to ensure packets of data arrive in the correct order. An atomic clock is the world’s most accurate

An atomic clock is the world’s most accurate timekeeping device. While a grandfather clock relies on a swinging pendulum and a digital watch relies on a vibrating quartz crystal, an atomic clock uses the ultra-stable vibrations of atoms—usually cesium or strontium—to measure the passage of time. How It Works

Scientists use these clocks to detect tiny changes in gravity (General Relativity) and to search for dark matter. Precision Limits