quantum frequency standards

Quantum frequency standards use highly precise atomic systems to keep accurate time. By measuring the natural vibrations of atoms—such as cesium or rubidium—they can establish a consistent "tick" rate. These standards rely on the fact that atoms emit or absorb electromagnetic signals at very specific frequencies, which are stable over time. By locking a clock's oscillator to this atomic resonance, quantum frequency standards achieve extraordinary accuracy, forming the basis for precise timekeeping in GPS, global communications, and scientific research. They are essential for applications requiring the highest level of timing precision.