Tailored optical clock transition in 40Ca+

L. Pelzer, K. Dietze, J. Kramer, F. Dawel, L. Krinner, N. Spethmann, V. Martinez, N. Aharon, A. Retzker, K. Hammerer, P. O. Schmidt*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


We engineer an artificial optical clock transition in 40Ca+ with a continuous dynamical decoupling scheme. It suppresses inhomogeneous tensor shifts as well as the linear Zeeman shift, making it suitable for multi-ion operation. Coherence times approaching the natural lifetime limit ensure low statistical uncertainties on the optical transition. We continuously apply the dressing fields, making the tailored transition robust against magnetic field fluctuations during the entire clock probe time.

Original languageAmerican English
Article number100326
JournalMeasurement: Sensors
StatePublished - Dec 2021

Bibliographical note

Funding Information:
We acknowledge support from Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy – EXC-2123 QuantumFrontiers – 390837967, Project-ID 434617780 – SFB 1464 (terraQ, project A04), and Project- ID 274200144 – SFB 1227 (DQ-mat, project B03), as well as EMPIR 17FUN03 USOQS and EMPIR 20FUN01 TSCAC. This work was financially supported by the State of Lower-Saxony, Hannover, Germany , from VW Vorab.

Publisher Copyright:
© 2021


  • Dynamic decoupling
  • Multi-ion clock
  • Optical ion clock
  • Quadrupole shift


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