GoKawiilLu+ ion clock demonstrates frequency accuracy to 19th decimal place
Researchers reported an optical frequency reference using trapped lutetium ions (Lu+) whose accuracy was experimentally verified to the 19th digit. The system uses paired ion interrogation with Doppler cooling, a Ramsey-based HA–HR sequence, and active magnetic-field feedback via shim coils to suppress Zeeman shift drift, alongside auxiliary spectroscopy checks to keep the clock laser and field measurements calibrated.
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Such extreme accuracy pushes optical atomic clocks closer to redefining the second and enabling ultra-precise tests of fundamental physics, geodesy, and timekeeping networks. The demonstrated stabilization techniques—especially compensating quadratic Zeeman shifts across differing magnetic fields—could inform design choices for future clock comparisons and networked timekeeping standards.
- Lu+ optical clock accuracy verified to 19 decimal digits
- Uses dual-ion interrogation with Ramsey-style HA–HR pulse sequence
- Active magnetic field feedback and auxiliary spectroscopy maintain calibration
Source: nature.com — Arnold, 2026-09-23
Published there as: “Lu<sup>+</sup> optical frequency references with accuracy verified at the 19th digit”
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