Blackbody radiation shift in strontium lattice clocks revisited

authored by: Christian Lisdat, Soren Dörscher, I. Nosske, Uwe Sterr
Abstract: We reevaluate the blackbody radiation (BBR) induced ac-Stark shift of the strontium clock transition (5s5p)P03-(5s2)S01 at 698nm used as reference in optical lattice clocks and as secondary representation of the SI unit "second."At room temperature, this frequency shift is on the order of 5×10-15 of the transition frequency and causes the largest correction in strontium lattice clocks. With the ongoing reduction of measurement uncertainties of optical clocks, an assessment of the approximations made in the evaluation of the BBR shift is advised. Our reevaluation leads to an increase of the BBR correction by 4×10-18 for clock operation at 300K, considerably larger than its present uncertainty of 1.6×10-18. Consistently describing accurately known atomic properties with an atomic structure model, we reduce the fractional uncertainty of the atomic response to 1×10-18 at 300K, which allows operating Sr lattice clocks with an uncertainty of 1×10-18 at room temperature.
External Organisation(s): National Metrology Institute of Germany (PTB)
Type: Article
Journal: Physical Review Research
Volume: 3
ISSN: 2643-1564
Publication date: 09.12.2021
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: Physics and Astronomy(all)
Electronic version(s): https://doi.org/10.1103/physrevresearch.3.l042036 (Access: Open)

BibTeX

@article{91149d8f6ad849a081b6b03e16cee45e,
title = "Blackbody radiation shift in strontium lattice clocks revisited",
abstract = "We reevaluate the blackbody radiation (BBR) induced ac-Stark shift of the strontium clock transition (5s5p)P03-(5s2)S01 at 698nm used as reference in optical lattice clocks and as secondary representation of the SI unit {"}second.{"}At room temperature, this frequency shift is on the order of 5×10-15 of the transition frequency and causes the largest correction in strontium lattice clocks. With the ongoing reduction of measurement uncertainties of optical clocks, an assessment of the approximations made in the evaluation of the BBR shift is advised. Our reevaluation leads to an increase of the BBR correction by 4×10-18 for clock operation at 300K, considerably larger than its present uncertainty of 1.6×10-18. Consistently describing accurately known atomic properties with an atomic structure model, we reduce the fractional uncertainty of the atomic response to 1×10-18 at 300K, which allows operating Sr lattice clocks with an uncertainty of 1×10-18 at room temperature.",
author = "Christian Lisdat and Soren D{\"o}rscher and I. Nosske and Uwe Sterr",
note = "Funding Information: We acknowledge support by the Project 18SIB05 ROCIT, which has received funding from the EMPIR programme co-financed by the Participating States and from the European Union's Horizon 2020 Research and Innovation Programme, and by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy–EXC-2123 QuantumFrontiers, Project-ID 390837967; SFB 1464 TerraQ, Project-ID 434617780, within Project A04; and SFB 1227 DQ-mat, Project-ID 274200144, within Project B02. This work was partially supported by the Max Planck-RIKEN-PTB Center for Time, Constants and Fundamental Symmetries funded equally by the three partners.",
year = "2021",
month = dec,
day = "9",
doi = "10.1103/physrevresearch.3.l042036",
language = "English",
volume = "3",
journal = "Physical Review Research",
issn = "2643-1564",
publisher = "American Physical Society",
number = "4",
}