Here is the world's most accurate clock: It tells the time to 19 decimal places

NEWS CENTER

Created: July 15, 2025 16:06

At the heart of the new watch is an aluminum ion . However, aluminum is difficult to measure with a laser and cool to absolute zero. Therefore, NIST researchers paired it with more controllable magnesium atoms. This method, called " quantum logic spectroscopy ," minimizes aluminum's challenges while preserving its advantages.

To make the watch more accurate, the trap system that holds the ions steady has also been redesigned. Electrical imbalances in the previous version affected measurement accuracy. The new system uses a thicker diamond plate and gold-plated electrodes.

BOTH THE LASER AND THE SYSTEM HAVE BEEN RENEWED

According to PopSci, the NIST team has made several innovations, including a more stable laser and an improved vacuum chamber. Measurements previously only possible for 150 milliseconds have now been extended to 1 second. This has reduced the time required to measure a second to 19 decimal places from 3 weeks to 1.5 days.

The new generation of clocks not only revolutionizes timekeeping; they could also pave the way for significant scientific breakthroughs in fields like quantum physics and computing. "With these precision measurement schemes," said lead author Mason Marshall, expressing his excitement, "we have the opportunity to push the boundaries of physics."

WHY IS IT SO IMPORTANT?

Being able to measure time with such precision doesn't just make clocks more accurate. Such advanced measurements play a critical role in many areas, from the more precise detection of gravitational waves to the development of quantum computers. They're also crucial for tracking Earth's gradually changing rotation rate, enabling systems like GPS to provide even more precise location data, and understanding the fundamental laws of the universe. In other words, measuring time with such fine precision holds the key to shaping the future of science.