NIST has developed a second-generation “quantum logic clock” using a single aluminum atom, which is now the world’s most precise clock. The new clock is more than twice as precise as the previous mercury-based version, and would neither gain nor lose a second for about 3.7 billion years. The clock uses a different type of “partner” ion (magnesium) compared to the original version (beryllium), which improves efficiency.
The enhanced precision of optical clocks like this one could lead to time standards up to 100 times more accurate than current microwave standards. NIST scientists are working on five different types of experimental optical clocks, each based on different atoms. The new clock’s performance was confirmed by comparing it to the original version, with the two clocks showing virtually identical “tick” rates.
Potential applications for such precise clocks include measuring possible changes in fundamental constants of nature, new types of gravity sensors for resource exploration, and ultra-precise autonomous navigation systems.
Keywords: ultraviolet, precision, resonant, quantum, frequency
