Optical frequency ratio of a 171Yb+ single-ion clock and a 87Sr lattice clock
Abstract
We report direct measurements of the frequency ratio of the 642 THz 2S1/2(F = 0)-2F7/2(F = 3) electric octupole transition in 171Yb+ and the 429 THz 1S0 -3P0 transition in 87Sr. A series of 107 measurements has been performed at the Physikalisch-Technische Bundesanstalt between December 2012 and October 2019. Long-term variations of the ratio are larger than expected from the individual measurement uncertainties of few 10−17. The cause of these variations remains unknown. Even taking these into account, we find a fractional uncertainty of the frequency ratio of 2.5 × 10−17, which improves upon previous knowledge by one order of magnitude. The average frequency ratio is νYb+ /νSr = 1.495 991 618 544 900 537(38). This represents one of the most accurate measurements between two different atomic species to date.
Details
- External Organisation(s)
-
Physikalisch-Technische Bundesanstalt PTB
- Type
- Article
- Journal
- METROLOGIA
- Volume
- 58
- ISSN
- 0026-1394
- Publication date
- 02.2021
- Publication status
- Published
- Peer reviewed
- Yes
- ASJC Scopus subject areas
- General Engineering
- Electronic version(s)
-
https://doi.org/10.1088/1681-7575/abc86f (Access:
Open
)
