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Suppression of differential light shifts in ground and metastable trapped-ion qubits

Drew Parks ^*, Thomas Dellaert ^*,†, Patrick McMillin ^‡, Conrad Roman ^‡, and Wesley C. Campbell

Andrei Derevianko

University of California Los Angeles, Los Angeles, California 90095, USA

Department of Physics, University of Nevada, Reno, Nevada 89557, USA

^*These authors contributed equally to this work.
^†Present address: IonQ, 1685 38th Street, Boulder, CO 80301.
^‡Present address: Quantinuum, 303 S Technology Ct, Broomfield, CO 80021.

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Phys. Rev. A 114, 032810 – Published 8 September, 2026

DOI: https://doi.org/10.1103/sd5z-hhm5

Abstract

In the presence of a magnetic field, hyperfine clock qubits can acquire a vector differential light shift that can be tuned via polarization to suppress the total differential light shift of high-power, off-resonant laser light. We experimentally measure this “magic” polarization condition, suppressing differential light shifts in both the ${}^{2}S_{1 / 2}$ ground and ${}^{2}F_{7 / 2}^{o}$ metastable clock qubits of ${}^{171}{Yb}^{+}$ . We present calculations of the minimum bias magnetic fields required to suppress differential light shifts in the ground-state clock qubits of commonly trapped-ion species, finding that they are below the strengths of fields already typically present in experiments. We further present methods for metastable clock-qubit control in ${}^{171}{Yb}^{+}$ , demonstrating a state preparation and measurement infidelity of $2 . 9_{- 1.5}^{+ 3.0} \times 10^{- 4}$ ( $- 35 \pm 4 dB$ ).

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Suppression of differential light shifts in ground and metastable trapped-ion qubits

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Physics Subject Headings (PhySH)

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