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87Sr lattice clock with inaccuracy below 10 -15.

Martin M Boyd1, Andrew D Ludlow, Sebastian Blatt

  • 1JILA, National Institute of Standards and Technology and Department of Physics, University of Colorado, Boulder, CO 80309-0440, USA.

Physical Review Letters
|March 16, 2007
PubMed
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Ultrahigh resolution spectroscopy characterized the 87Sr lattice clock resonance uncertainty to 9 x 10(-16). This advancement in optical atomic clocks offers superior stability and accuracy compared to current cesium standards.

Area of Science:

  • Atomic, Molecular, and Optical Physics
  • Metrology
  • Quantum Information Science

Background:

  • Cesium (Cs) fountain clocks are primary time standards but have limitations in stability and precision.
  • Neutral-atom optical clocks, particularly those using strontium (Sr), show promise for exceeding Cs fountain clock performance.
  • Lattice-confined atoms offer enhanced stability for optical atomic clocks.

Purpose of the Study:

  • To characterize the systematic uncertainty of the 1S0-3P0 clock resonance in lattice-confined 87Sr.
  • To measure the absolute frequency of the 87Sr clock transition with unprecedented accuracy.
  • To compare the performance and potential of Sr lattice clocks against established Cs standards.

Main Methods:

  • Utilizing ultrahigh resolution spectroscopy to probe the 1S0-3P0 transition in laser-cooled and lattice-confined 87Sr atoms.

Related Experiment Videos

  • Implementing advanced techniques for systematic uncertainty evaluation and frequency measurement.
  • Comparing experimental results with theoretical predictions and established metrological standards.

    • Main Results:

    • The overall systematic uncertainty of the 87Sr lattice clock resonance was characterized to 9 x 10(-16).
    • The absolute frequency of the clock transition was measured as 429 228 004 229 874.0(1.1) Hz.
    • A fractional uncertainty of 2.5 x 10(-15) was achieved, representing the most accurate measurement of a neutral-atom optical transition frequency to date.
    • The potential stability of Sr lattice clocks was shown to exceed that of Cs fountain standards.

    Conclusions:

    • The 87Sr lattice clock demonstrates a systematic uncertainty comparable to Cs fountain primary standards.
    • The achieved fractional uncertainty in frequency measurement sets a new benchmark for neutral-atom optical clocks.
    • Lattice-confined Sr atoms offer a promising platform for next-generation atomic clocks with enhanced stability and accuracy.