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Landé g Factor Measurement of ^{48}Ti^{+} Using Simultaneous Comagnetometry and Quantum Logic Spectroscopy.

Till Rehmert^1,2, Maximilian J Zawierucha^1,2, Sergey G Porsev³

¹Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany.

Physical Review Letters

|March 13, 2026

Summary

This summary is machine-generated.

We developed a quantum logic technique using comagnetometry to precisely measure ion magnetic properties, overcoming magnetic field fluctuations. This method achieves high accuracy for ground state g factors of single ^{48}Ti^{+} ions, even for ions not laser-cooled.

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Area of Science:

Quantum information science
Atomic physics
Spectroscopy

Background:

Temporal magnetic field fluctuations introduce systematic errors in precision measurements of ion magnetic properties.
Comagnetometry offers a method to mitigate such systematic effects by using a reference system.

Purpose of the Study:

To present a novel quantum logic scheme that utilizes comagnetometry to suppress systematic errors in measuring ion magnetic properties.
To achieve high-precision measurements of the ground state g factors of a single ^{48}Ti^{+} ion.

Main Methods:

Simultaneous interrogation of a spectroscopy ion and a cotrapped reference ion with a known g factor in a Paul trap.
Employing a quantum logic scheme with comagnetometry to cancel out magnetic field noise.

Main Results:

Measurement of the ground state g factors of a single ^{48}Ti^{+} ion with uncertainties at the 10^{-6} level in a weak magnetic field regime.
Demonstration that the scheme is applicable to ions that cannot be directly laser cooled.
Comparison of experimental results with theoretical predictions from configuration interaction and second-order many-body perturbation theory.

Conclusions:

The developed quantum logic scheme effectively mitigates systematic effects from magnetic field fluctuations.
Experimental and theoretical results for the g factors of ^{48}Ti^{+} show agreement within the expected accuracy.
The technique provides a versatile tool for precision measurements in atomic physics and quantum information science.