Tick, Tock, Atoms: The Fascinating Science Behind the Atomic Clock

Atomic clocks measure time to the nanosecond—and even greater precision—by using the ultra-stable, unchanging vibrations of electrons in atoms as a universal metronome. Unlike mechanical clocks or quartz watches that degrade, drift, or react to temperature, atoms of a specific element always tick at the exact same frequency across the universe. How the Nanosecond is Captured

The core mechanism relies on quantum mechanics and electronic feedback loops to isolate and count atomic transitions.

Atomic Clocks in Switzerland | Accurate Time from Neuchâtel