Tofful, A; Baynham, C F A; Curtis, A; Parsons, A O; Robertson, B I; Schioppo, M; Tunesi, J; Margolis, H S; Hendricks, R J; Whale, J; Thompson, R C; Godum, R M (2024) 171Yb+ optical clock with 2.2 × 10−18 systematic uncertainty and absolute frequency measurements. Metrologia, 61 (4). 045001

Preview

Text eid10218.pdf - Published Version Available under License Creative Commons Attribution. Download (881kB) | Preview

Abstract

A full evaluation of the uncertainty budget for the ytterbium ion optical clock at the National Physical Laboratory (NPL) was performed on the electric octupole (E3) 2S1/2 → 2F7/2 transition. The total systematic frequency shift was measured with a fractional standard systematic uncertainty of 2.2 × 10−18. Furthermore, the absolute frequency of the E3 transition of the 171Yb+ ion was measured between 2019 and 2023 via a link to International Atomic Time (TAI) and against the local caesium fountain NPL-CsF2. The absolute frequencies were measured with uncertainties between 3.7 × 10−16 and 1.1 × 10−15, and all were in agreement with the 2021 BIPM recommended frequency.

Item Type:	Article
Subjects:	Time and Frequency > Optical Frequency Standards and Metrology
Divisions:	Time & Frequency
Identification number/DOI:	10.1088/1681-7575/ad53cd
Last Modified:	22 Aug 2025 13:43
URI:	https://eprintspublications.npl.co.uk/id/eprint/10218