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Researchers developed a new quantum logic spectroscopy technique to precisely measure atomic ion transitions. This method overcomes previous limitations, enabling accurate spectroscopy for previously inaccessible ions and opening new windows for physics research.

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Area of Science:

  • Atomic and molecular physics
  • Quantum optics
  • Spectroscopy

Background:

  • Precision spectroscopy of ions is crucial for new physics discoveries.
  • Traditional methods are limited to ions with specific laser-cooling transitions.
  • Quantum logic spectroscopy (QLS) has enabled cooling for ions with long-lived states.

Purpose of the Study:

  • To extend QLS to fast, dipole-allowed transitions.
  • To perform high-accuracy absolute frequency measurements on such transitions.
  • To enable spectroscopy of ions previously inaccessible to QLS.

Main Methods:

  • Developed a novel QLS technique using photon recoil.
  • Co-trapped a target ion with a second ion suitable for QLS.
  • Detected photon absorption via amplified recoil signal on the co-trapped ion.
  • Applied the method to measure a dipole-allowed transition in (40)Ca(+)

Main Results:

  • Achieved an absolute frequency measurement of a dipole-allowed transition.
  • Resolved the line center of the (40)Ca(+) transition to 1/300 of its linewidth.
  • Demonstrated one of the most accurate measurements of a broad spectral line.
  • Amplified weak photon absorption signals to thousands of fluorescence photons.

Conclusions:

  • The new QLS technique successfully extends precision spectroscopy to fast transitions.
  • This versatile method significantly broadens the range of accessible atomic and molecular ions.
  • Enables new avenues for fundamental physics research and high-precision measurements.