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Researchers developed a compact, transportable optical clock using a trapped aluminum ion and calcium ions for quantum logic spectroscopy. This advancement enables precise measurements for new applications like chronometric leveling.

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Area of Science:

  • Atomic Physics
  • Quantum Optics
  • Metrology

Background:

  • Optical clocks achieve unprecedented fractional frequency uncertainties (<10-17).
  • New applications like chronometric leveling require high-precision timekeeping.
  • Transportable optical clocks are crucial for deploying these advancements outside laboratory settings.

Purpose of the Study:

  • To develop a compact and transportable optical clock based on a single trapped aluminum ion (27Al+).
  • To utilize quantum logic spectroscopy with singly charged calcium ions (40Ca+) for sympathetic cooling, state preparation, and readout.
  • To present a simplified physics and laser package for ion manipulation.

Main Methods:

  • Development of a segmented multilayer ion trap with distinct loading and probing zones.
  • Integration of a compact titanium vacuum chamber and a high numerical aperture imaging system.
  • Implementation of an all-fiber laser system for 40Ca+ repumping and quantum logic operations.

Main Results:

  • Preliminary estimates of trap-induced frequency shifts on 27Al+ were obtained using 40Ca+.
  • The micromotion-induced second-order Doppler shift for 27Al+ was measured as -0.4-0.3+0.4×10-18.
  • The black-body radiation shift for 27Al+ was determined to be (-4.0 ± 0.4) × 10-18.
  • Measured heating rates of 30(7) quanta/sec enabled interrogation times of hundreds of milliseconds.

Conclusions:

  • The developed compact physics package is suitable for building transportable optical clocks.
  • The quantum logic spectroscopy approach with 40Ca+ is effective for interrogating 27Al+.
  • The preliminary frequency shift measurements are critical for understanding clock performance and accuracy.