Snapping an atom is like photographing a startled butterfly without scaring it off. Scientists use two alternating beams: one holds, the other cools like a gentle breeze. This reduces entropy (the atom's jitter) and chills them to millionths of a degree above absolute zero — colder than deep space.
The holding energy needed is half the usual — minimizing the risk of loss. The method will benefit quantum computers with thousands of qubits and ultra-precise clocks.
It relies on spectroscopy (the science of light and matter) and photometry (measuring brightness). Ultimately, atoms will serve as both switches and pendulums for the most precise clocks.
A single ytterbium atom is not only a computational element but also a pendulum for the most precise clocks: they'd lose less than a second over billions of years.