An 115In+-172Yb+ Coulomb crystal clock with 2.5x10-18 systematic uncertainty

authored by
H. N. Hausser, J. Keller, T. Nordmann, N. M. Bhatt, J. Kiethe, H. Liu, M. von Boehn, J. Rahm, S. Weyers, E. Benkler, B. Lipphardt, S. Doerscher, K. Stahl, J. Klose, C. Lisdat, M. Filzinger, N. Huntemann, E. Peik, T. E. Mehlstäubler
Abstract

We present a scalable mixed-species Coulomb crystal clock based on the 1S0 ↔ 3P0 transition in 115In+. 172Yb+ ions are co-trapped 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/1s. We report on an absolute frequency measurement with an uncertainty of 1.3×10−16 and optical frequency ratios relative to the 171Yb+ (E3) and 87Sr clock transitions with fractional uncertainties of 4.4 and 4.7 parts in 1018, respectively. The latter are among the most precise measurements of frequency ratios to date and improve upon the previous uncertainty of the 115In+/87Sr ratio by two orders of magnitude. We also demonstrate operation with four 115In+ clock ions, which reduces the instability to 9.2×10−16√τ/1s.

Organisation(s)
Institute of Quantum Optics
Laboratory of Nano and Quantum Engineering
External Organisation(s)
National Metrology Institute of Germany (PTB)
Type
Preprint
No. of pages
13
Publication date
26.02.2024
Publication status
E-pub ahead of print
Electronic version(s)
https://doi.org/10.48550/arXiv.2402.16807 (Access: Open)