Super-precise optical clocks in four nations tick in harmony
Nature, Published online: 04 September 2026; doi:10.1038/d41586-026-02741-9Comparison using signals sent over fibre-optic cable tests agreement between seven devices spread across Europe.
<p>Nature, Published online: 04 September 2026; doi:10.1038/d41586-026-02741-9Comparison using signals sent over fibre-optic cable tests agreement between seven devices spread across Europe.</p>