Physicists Built Most Accurate Atomic Clocks Yet
Researchers at the National University of Singapore achieved a record-breaking error estimate using lutetium atoms.
Updated on Sept. 28, 2026 in Physics
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Physicists have developed two atomic clocks using lutetium atoms that achieved an error estimate of 1 part in 10 quintillion. This result is four times smaller than the previous record for clock precision.
Why it matters
Comparing two identical clocks is the only method to verify the absolute accuracy of a time standard. Refining this precision is a critical step for future scientific measurements and global timing synchronization.
The researchers held single lutetium ions in place with electric fields and utilized an averaging technique across three ticks to cancel out noise. The setup measured the height difference between ions to within 1 millimeter.
The players
National University of Singapore
This public research university hosts the laboratory where the lutetium atomic clock research was conducted.
Nature
This is a weekly international journal that publishes peer-reviewed research across all fields of science and technology.
The details
By building two copies of the system, the team conducted 11 comparison runs over 200 hours to confirm the stability of the clocks. Lutetium was chosen because it represents the least sensitive established atomic clock system regarding heat and magnetic field interference.
Timeline
The team conducted 11 comparison runs over approximately 12 days.
International authorities may redefine the second in 2030 or later.
The Big Picture
This development shifts the trajectory of precision metrology by proving lutetium is a viable, superior alternative to current standards. It establishes a new paradigm for clock stability that directly supports the upcoming redefinition of the International System of Units.
While currently a lab-scale experiment, researchers plan to miniaturize these clocks into transportable systems. Such technology could eventually lead to more precise satellite navigation and highly sensitive gravitational sensing tools.
The takeaway
Advancements in atomic clock accuracy provide the foundation for modern global infrastructure like GPS and high-speed communication networks. These improvements ensure that the next generation of timekeeping remains synced with the fundamental physical constants of the universe.
What happens next
International time standard bodies are expected to evaluate the redefinition of the second in 2030 or later.
Further reading
For more information on advanced measurement standards, visit the Physics section.
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