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Landé g Factor Measurement of 48Ti+ Using Simultaneous Comagnetometry and Quantum Logic Spectroscopy

Till Rehmert1,2,*, Maximilian J. Zawierucha1,2, Sergey G. Porsev3, Kai Dietze1,2, Piet O. Schmidt1,2, Dmytro Filin3, Charles Cheung3, Marianna S. Safronova3, and Fabian Wolf1,†

  • *Contact author: till.rehmert@ptb.de
  • †Contact author: fabian.wolf@ptb.de
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Phys. Rev. Lett. 136, 083203 – Published 27 February, 2026

DOI: https://doi.org/10.1103/1x4h-5ycp

Abstract

We present a quantum logic scheme mitigating systematic effects in the measurement of magnetic properties of ions caused by temporal magnetic field fluctuations through comagnetometry. This is achieved through simultaneous interrogation of a spectroscopy ion and a cotrapped reference ion with a precisely known g factor confined in a Paul trap. This allows measurement of the ground state g factors of a single Ti+48 ion with uncertainties at the 10−6 level in the weak B-field regime. The experimental scheme can be applied to many ions, including those that cannot be directly laser cooled. We compare the experimentally determined g factors of Ti+48 with new theoretical predictions using a combination of configuration interaction and second-order many-body perturbation theory. Theory and experiment agree within the expected level of accuracy.

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Phys. Rev. Lett. 136, 083203– Published 27 February, 2026
  • Received 21 August 2025
  • Revised 14 November 2025
  • Accepted 20 January 2026
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