ScienceLutetium-ion clocks reportedly reach 1×10⁻¹⁹ uncertainty
A EurekAlert release describes an atomic clock at Singapore’s Centre for Quantum Technologies as record-setting, with results published in Nature on September 23.
TLDR
A September 24 science roundup says two frequency references, each using a single lutetium-176 ion, reached uncertainty around 1×10⁻¹⁹ and agreed at 5.7×10⁻¹⁹ after 200 hours. The roundup notes an important limit: the comparison took place at one site using a shared clock laser. Comparable long-distance tests between laboratories remain open.
