Quantum timekeeping

Physicists are exploring the mind-blowing possibilities of linking a new generation of atomic clocks

By Andrew Grant, 17:26 PM February 20, 2014

The best clock in the world has no hands, no pendulum, no face or digital display. It’s a jumble of lasers, wires and strontium atoms in Jun Ye’s lab at the National Institute of Standards and Technology (NIST) in Boulder, Colo. He keeps it cooled to about three millionths of a degree above absolute zero.

The clock, described by Ye in the Feb. 6 Nature, is so precise that had it begun ticking when Earth formed 4.5 billion years ago, it would not yet have gained or lost a second. Over that span...

Source URL: https://www.sciencenews.org/article/quantum-timekeeping?mode=magazine&context=188098