Evaluation of a 88Sr+ optical clock with a direct measurement of the blackbody radiation shift and determination of the clock frequency

authored by: M. Steinel, H. Shao, M. Filzinger, B. Lipphardt, M. Brinkmann, A. Didier, T. E. Mehlstäubler, T. Lindvall, E. Peik, N. Huntemann
Abstract: We report on an evaluation of an optical clock that uses the 2S1/2→2D5/2 transition of a single 88Sr+ ion as the reference. In contrast to previous work, we estimate the effective temperature of the blackbody radiation that shifts the reference transition directly during operation from the corresponding frequency shift and the well-characterized sensitivity to thermal radiation. We measure the clock output frequency against an independent 171Yb+ ion clock, based on the 2S1/2(F=0)→2F7/2(F=3) electric octupole (E3) transition, and determine the frequency ratio with a total fractional uncertainty of 2.3×10−17. Relying on a previous measurement of the 171Yb+ (E3) clock frequency, we find the absolute frequency of the 88Sr+ clock transition to be 444779044095485.271(59)Hz. Our result reduces the uncertainty by a factor of 3 compared to the previously most accurate measurement and may help to resolve so far inconsistent determinations of this value. We also show that for three simultaneously interrogated 88Sr+ ions, the increased number causes the expected improvement of the short-term frequency instability of the optical clock without degrading its systematic uncertainty.
Organisation(s): Institute of Quantum Optics
Laboratory of Nano and Quantum Engineering
CRC 1227 Designed Quantum States of Matter (DQ-mat)
External Organisation(s): National Metrology Institute of Germany (PTB)
VTT Technical Research Centre of Finland Ltd.
Type: Preprint
Publication date: 16.12.2022
Publication status: E-pub ahead of print
Electronic version(s): https://doi.org/10.48550/arXiv.2212.08687 (Access: Open)

BibTeX

@techreport{6a960cfaf74d40ab99c0befbfecabfee,
title = "Evaluation of a 88Sr+ optical clock with a direct measurement of the blackbody radiation shift and determination of the clock frequency",
abstract = "We report on an evaluation of an optical clock that uses the 2S1/2→2D5/2 transition of a single 88Sr+ ion as the reference. In contrast to previous work, we estimate the effective temperature of the blackbody radiation that shifts the reference transition directly during operation from the corresponding frequency shift and the well-characterized sensitivity to thermal radiation. We measure the clock output frequency against an independent 171Yb+ ion clock, based on the 2S1/2(F=0)→2F7/2(F=3) electric octupole (E3) transition, and determine the frequency ratio with a total fractional uncertainty of 2.3×10−17. Relying on a previous measurement of the 171Yb+ (E3) clock frequency, we find the absolute frequency of the 88Sr+ clock transition to be 444779044095485.271(59)Hz. Our result reduces the uncertainty by a factor of 3 compared to the previously most accurate measurement and may help to resolve so far inconsistent determinations of this value. We also show that for three simultaneously interrogated 88Sr+ ions, the increased number causes the expected improvement of the short-term frequency instability of the optical clock without degrading its systematic uncertainty. ",
keywords = "physics.atom-ph, quant-ph",
author = "M. Steinel and H. Shao and M. Filzinger and B. Lipphardt and M. Brinkmann and A. Didier and Mehlst{\"a}ubler, {T. E.} and T. Lindvall and E. Peik and N. Huntemann",
year = "2022",
month = dec,
day = "16",
doi = "10.48550/arXiv.2212.08687",
language = "English",
type = "WorkingPaper",
}