A dual-species optical clock to investigate variations of the fine-structure constant and test local position invariance

Martin Steinel (Corresponding author), Hu Shao, Thomas Lindvall, Melina Filzinger, Richard Lange, Tanja E. Mehlstäubler, Ekkehard Peik, Nils Huntemann

Research output: Chapter in Book/Report/Conference proceedingConference abstract in proceedingsScientific

Abstract

Optical clocks realize transition frequencies between atomic energy levels with a relative uncertainty below 10-18. Frequency ratio measurements between optical clocks can reach even lower uncertainties if systematic shifts are common mode for the atomic references like environmental disturbances or result from the same atomic parameter. This precision can be used to search for violations of local position invariance by exploiting the dependence of transition frequencies on fundamental constants like the fine structure constant α. An ion particularly suited to this task is 171Yb+
. It provides two optical clock transitions from the ground state to the first and second excited state, an electric octupole (E3) transition and an electric quadrupole (E2) transition, respectively. Because of the large mass of the ion, both transition frequencies show a large sensitivity on a variation of α and the difference in the electronic structure of the two excited states leads to a dependence of opposite sign. Repeated measurements of the ratio of the two transition frequencies provide the most stringent limits on temporal drifts of α and a potential dependence on the gravitational field [1]. To further enhance the performance of the 171Yb+ clocks and clearly distinguish clock shifts from variations of α, we employ 88Sr+ co-trapped in the same apparatus. 88Sr+ also features an E2 clock transition but its frequency only weakly depends on α. Furthermore, this ion can be used for sympathetic cooling and to investigate systematic frequency shifts of the 171Yb+ E3 transition on a magnified scale. We present progress towards combined clock operation with both species and a first precise measurement of the ratio of the 88Sr+ E2 and the 171Yb+ E3 transition frequencies. Here, we demonstrate an in-situ evaluation of the effective temperature of thermal radiation perturbing the ion and of oscillating magnetic fields using 88Sr+
.
Original languageEnglish
Title of host publicationHigh-precision measurements and searches for New Physics
Subtitle of host publication766. WE-Heraeus-Seminar
PublisherWilhelm and Else Heraeus Foundation
Pages87-87
Number of pages1
Publication statusPublished - 2022
MoE publication typeNot Eligible
Event766. WE-Heraeus-Seminar: High‐Precision Measurements and Searches for New Physics - Physikzentrum Bad Honnef, Bad Honnef, Germany
Duration: 9 May 202213 May 2022

Conference

Conference766. WE-Heraeus-Seminar: High‐Precision Measurements and Searches for New Physics
Country/TerritoryGermany
CityBad Honnef
Period9/05/2213/05/22

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