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Progress at NIST toward absolute frequency standards using stored ions.

D J Wineland1, J C Bergquist, J J Bollinger

  • 1Nat. Inst. of Stand. and Technol., Boulder, CO.

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|January 1, 1990
PubMed
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Researchers explored high-accuracy frequency standards using stored ions. Experiments with Beryllium ions (Be+) and Mercury ions (Hg+) demonstrated high stability and precision, paving the way for advanced timekeeping technologies.

Area of Science:

  • Atomic Physics
  • Metrology
  • Quantum Information Science

Background:

  • Development of highly accurate frequency standards is crucial for scientific advancement and technological innovation.
  • Stored ions offer promising platforms for realizing frequency standards due to their isolation and controllable quantum states.

Purpose of the Study:

  • To summarize experimental progress toward high-accuracy frequency standards using stored ions.
  • To investigate the feasibility of using nuclear spin-flip transitions in Be+ and electric quadrupole transitions in Hg+ for frequency standards.

Main Methods:

  • Experiment 1: Locking an RF oscillator to a nuclear spin-flip hyperfine transition in laser-cooled Be+ ions stored in a Penning trap.
  • Experiment 2: Probing an electric quadrupole transition in a single laser-cooled Hg+ ion stored in a Paul trap using a stable laser.

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Main Results:

  • Achieved stability better than 3x10(-12)tau(-(1/2)) for the Be+ hyperfine transition.
  • Estimated uncertainty in Doppler shifts for Be+ experiment to be less than 5x10(-15).
  • Measured a Q value of approximately 10(13) for the Hg+ electric quadrupole transition.

Conclusions:

  • Stored ions, specifically Be+ and Hg+, are viable candidates for high-accuracy frequency standards.
  • The demonstrated stability and precision highlight the potential for future advancements in metrology and quantum technologies.