Physicists create groundbreaking atomic clock that's off by less than 1 second every 100 million years

Scientists at the National Institute of Standards and Technology have developed NIST-F4, a new cesium fountain atomic clock. Set to begin operation in April 2025, it loses less than a second every 140 million years. NIST-F4 will contribute to defining Coordinated Universal Time and is vital for applications like financial transactions and global timekeeping. Researchers carefully addressed potential sources of interference to ensure its reliability.