GoKawiilNUS physicists build lutetium atomic clock accurate to 260 billion years
Researchers at the National University of Singapore have built an optical atomic clock using lutetium ions that is four times more precise than the previous record-holder, a calcium-ion clock. The device would lose less than a second over roughly 260 billion years, making it the most accurate timekeeper reported to date, according to a study published in Nature on September 23.