115In+ - 172Yb+ Coulomb Crystal Clock with 2.5×10-18 Systematic Uncertainty
Abstract
We present a scalable mixed-species Coulomb crystal clock based on the S01↔P30 transition in In+115. Yb+172 ions are cotrapped and used for sympathetic cooling. Reproducible interrogation conditions for mixed-species Coulomb crystals are ensured by a conditional preparation sequence with permutation control. We demonstrate clock operation with a 1In+-3Yb+ crystal, achieving a relative systematic uncertainty of 2.5×10-18 and a relative frequency instability of 1.6×10-15/τ/1 s. We report on absolute frequency measurements with an uncertainty of 1.3×10-16 and optical frequency comparisons with clocks based on Yb+171 (E3) and Sr87. With a fractional uncertainty of 4.4×10-18, the former is - to our knowledge - the most accurate frequency ratio value reported to date. For the In+115/Sr87 ratio, we improve upon the best previous measurement by more than an order of magnitude. We also demonstrate operation with four In+115 clock ions, which reduces the instability to 9.2×10-16/τ/1 s.
Details
- Organisation(s)
-
Institute of Quantum Optics
Laboratory of Nano and Quantum Engineering
- External Organisation(s)
-
Physikalisch-Technische Bundesanstalt PTB
- Type
- Article
- Journal
- Physical Review Letters
- Volume
- 134
- No. of pages
- 6
- ISSN
- 0031-9007
- Publication date
- 16.01.2025
- Publication status
- Published
- Peer reviewed
- Yes
- ASJC Scopus subject areas
- General Physics and Astronomy
- Electronic version(s)
-
https://doi.org/10.48550/arXiv.2402.16807 (Access:
Open
)
https://doi.org/10.1103/PhysRevLett.134.023201 (Access: Open )
