# Lutetium atomic clock reaches reported uncertainty of 1 x 10-19

_Published Wednesday, September 23, 2026 at 4:53 PM EDT · Science · Latest · Tier 2 — Notable_

![Lutetium atomic clock reaches reported uncertainty of 1 x 10-19 — Primary](https://scx2.b-cdn.net/gfx/news/hires/2026/singapore-scientists-b.jpg)

Researchers at Singapore's Centre for Quantum Technologies report an uncertainty of 1 x 10-19 for a lutetium atomic clock, the lowest reported for an optical atomic clock. They measured its frequency to 19 decimal places and compared two clocks that agreed to an uncertainty of 5.7 x 10-19.

The clock counts light oscillations matched to an energy change in a lutetium ion. That transition is relatively insensitive to temperature and magnetic-field changes. The instrument remains laboratory-scale, and gravitational differences between distant locations are not yet known precisely enough to compare clocks at this level.

## Sources

- [Phys.org](https://phys.org/news/2026-09-scientists-world-accurate-atomic-clock.html)

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Canonical: https://techandbusiness.org/newswire/DdZAQhEm9Kth8RjBLcxSHb
Published: 2026-09-23T20:53:33.526Z
Story chronology: 2026-09-23T20:20:03.000Z
Retrieved: 2026-09-23T22:18:01.308Z
Publisher: Tech & Business (techandbusiness.org)