Physicists at the Centre for Quantum Technologies at the National University of Singapore (NUS) have built the most accurate atomic clock ever reported, a device so precise it would lose only one second over roughly 260 billion years. The result, published in Nature on September 23, 2026, pushes timekeeping four times past the previous world record.
Beyond the headline number, the breakthrough matters because atomic clocks are not just laboratory curiosities: they are the hidden backbone of GPS navigation, financial trading networks, and the internet itself. A clock this precise opens the door to rewriting how those systems are built.
How the record was set
The NUS team trapped a single lutetium-176 ion using electric fields and measured the frequency of its atomic transition to nineteen decimal places. Lutetium’s heavy mass and internal structure make it unusually resistant to heat radiation and stray magnetic fields, the two main sources of error that normally limit optical atomic clocks.
- Measurement uncertainty: just 1 part in 10 quintillion (1×10⁻¹⁹).
- About four times more accurate than the previous record, a calcium-ion clock built by the Chinese Academy of Sciences in Wuhan.
- Also more precise than the aluminium-ion clock developed by the US National Institute of Standards and Technology.
Why it matters beyond the record books
Every GPS satellite carries an atomic clock, and tiny timing errors translate directly into positioning errors on the ground. A new generation of ultra-precise clocks, small and stable enough to eventually fly on satellites, could sharpen navigation accuracy well beyond what current systems deliver.
The same precision is relevant to fundamental physics. Scientists use atomic clocks to test whether the constants of nature are truly constant, by comparing how different atoms tick over months and years. A clock this stable can detect smaller drifts than ever before, giving physicists a sharper tool to probe dark matter and the stability of physical law itself. It also feeds into the push toward a future redefinition of the second, the base unit of time in the International System of Units, which metrologists have been preparing for over a decade.
The advance follows a string of quantum-engineering milestones already covered this year, including the shifting landscape of how search results get verified online and how split-second AI measurements are reshaping medical diagnosis. Both stories share the same thread: shaving fractions of a second or a percentage point off a measurement can unlock entirely new capabilities, a pattern also visible in last week’s one-year results from a single-dose cholesterol gene-editing trial.
What comes next
The lutetium clock remains a laboratory instrument for now, built around a single trapped ion and sensitive equipment that cannot yet be shrunk into a satellite or a data center. Researchers say the next steps involve improving the clock’s stability over longer stretches of time and exploring whether the same ion-trapping approach can be made more compact without losing accuracy.
Frequently Asked Questions
What makes the Singapore atomic clock the most accurate ever built?
It uses a single lutetium-176 ion whose atomic transition was measured with an uncertainty of just 1 part in 10 quintillion, making it about four times more precise than the previous record-holding clock.
How does a more precise atomic clock affect everyday technology?
Atomic clocks underpin GPS satellites, financial networks, and telecommunications timing. A more precise clock could eventually improve navigation accuracy and network synchronization once the technology becomes compact enough for practical deployment.
Could this clock change the definition of the second?
Not immediately. The result strengthens the case for optical atomic clocks as future timekeeping standards, a shift metrologists have been preparing for years, but any formal redefinition of the second requires international agreement among standards bodies.
Sources
This article was written with the help of artificial intelligence. Editorial policy
