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JPL Ultrastable Trapped Ion Atomic Frequency Standards.

Eric A Burt, Lin Yi, Blake Tucker

    IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
    |June 2, 2016
    PubMed
    Summary
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    Researchers developed a new ultrastable trapped ion atomic clock, L10, achieving excellent short-term stability and demonstrating minimal drift over two weeks. This advancement is key for precise timekeeping applications.

    Area of Science:

    • Atomic Physics
    • Metrology
    • Clock Technology

    Background:

    • Development of room-temperature trapped ion atomic clocks at Jet Propulsion Laboratory (JPL) focuses on three areas: ultrastable clocks for terrestrial use, space-hardened clocks, and miniature clocks.
    • This work specifically addresses the development of ultrastable atomic clocks for demanding terrestrial applications requiring high stability and autonomous timekeeping.

    Purpose of the Study:

    • To present the design and initial results of a new ultrastable trapped ion atomic clock, designated L10.
    • To evaluate the short-term stability and long-term drift performance of the L10 clock.

    Main Methods:

    • Design and construction of a novel room-temperature trapped ion atomic clock (L10).
    • Experimental measurement of the clock's short-term stability using Allan deviation.

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  • Assessment of clock drift over a two-week period with high uncertainty.

    • Main Results:

    • The L10 clock achieved a short-term stability of 4.5 × 10⁻¹⁴/τ¹/².
    • Initial measurements indicated no significant drift over a two-week period, with an uncertainty of 2.4 × 10⁻¹⁶ /day.

    Conclusions:

    • The L10 clock design demonstrates promising performance for ultrastable timekeeping.
    • The achieved stability and low drift are significant advancements for terrestrial atomic clock applications.