NIST 'Quantum Logic Clock' Rivals Mercury Ion As World's Most Accurate Clock

An atomic clock that uses an aluminum atom to apply the logic of computers to the peculiarities of the quantum world now rivals the world's most accurate clock, based on a single mercury atom. Both clocks are at least 10 times more accurate than the current U.S. time standard. The measurements were made in a yearlong comparison of the two next-generation clocks.