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High-Resolution Spectroscopy of ^{173}Yb^{+} Ions.

J Jiang1, A V Viatkina1,2, Saaswath Jk1

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

Physical Review Letters
|January 30, 2026
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Summary
This summary is machine-generated.

Researchers characterized the electronic spectrum of ytterbium-173 ions (¹⁷³Yb⁺), enabling advancements in quantum computing and atomic clocks. This study precisely measured transitions and hyperfine structure, improving nuclear property determination.

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Area of Science:

  • Atomic Physics
  • Quantum Information Science
  • Spectroscopy

Background:

  • Ytterbium-173 ions (¹⁷³Yb⁺) offer unique advantages for quantum technologies due to their rich hyperfine structure.
  • However, the electronic spectrum of ¹⁷³Yb⁺ is not well-characterized, limiting its applications.
  • Precise characterization is crucial for developing advanced quantum computing architectures and atomic clocks.

Purpose of the Study:

  • To efficiently laser cool, prepare, and detect single trapped ¹⁷³Yb⁺ ions.
  • To characterize the previously unobserved ²S₁/₂→²D₃/₂ electric quadrupole transition at 436 nm.
  • To precisely measure isotope shifts and hyperfine structure for improved quantum applications.

Main Methods:

  • Laser cooling and trapping of single ¹⁷³Yb⁺ ions.
  • Coherent excitation of the ²S₁/₂→²D₃/₂ electric quadrupole transition.
  • Microwave spectroscopy to resolve hyperfine structure.
  • Determination of isotope shifts and nuclear magnetic octupole moment.

Main Results:

  • Efficient laser cooling, state preparation, and detection of single ¹⁷³Yb⁺ ions achieved.
  • The ²S₁/₂→²D₃/₂ transition at 436 nm was coherently excited.
  • Isotope shift for ¹⁷¹Yb⁺ determined with 1.4 Hz uncertainty.
  • Hyperfine structure of the ²D₃/₂ state resolved with <10⁻⁸ relative uncertainty.
  • Nuclear magnetic octupole moment of ¹⁷³Yb inferred with significantly reduced uncertainty.
  • Hyperfine anomalies for ²S₁/₂ and ²D₃/₂ states determined.

Conclusions:

  • This work provides crucial characterization of the ¹⁷³Yb⁺ electronic spectrum.
  • The findings enable more sophisticated quantum computing architectures and improved atomic clocks.
  • Enhanced precision in measuring nuclear properties like the magnetic octupole moment was achieved.