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    Area of Science:

    • Metrology and Timekeeping
    • Quantum Physics and Frequency Standards

    Background:

    • Current time scales rely on continuously operating clocks like hydrogen masers and cesium fountains.
    • Optical frequency standards offer superior stability but often do not operate continuously.

    Purpose of the Study:

    • To simulate and compare the performance of a time scale using hydrogen masers and a non-continuous optical frequency standard.
    • To evaluate this time scale against one utilizing a continuous cesium fountain alongside hydrogen masers.

    Main Methods:

    • Developed a simulation model for time scale generation.
    • Incorporated data from continuously operating commercial hydrogen masers.
    • Modeled the performance impact of a highly stable, non-continuous optical frequency standard versus a continuous cesium fountain.

    Main Results:

    • The simulated time scale using the optical standard demonstrated competitive or superior performance.
    • Performance was independent of specific optical standard characteristics, relying only on its superior stability over masers.
    • The simulation results indicated the viability of integrating non-continuous, high-stability optical standards into operational time scales.

    Conclusions:

    • A time scale combining hydrogen masers with a stable optical frequency standard is a viable and potentially high-performing alternative.
    • Two methods for implementing these simulation findings into operational time scales are discussed.
    • This research paves the way for next-generation timekeeping systems leveraging advanced optical frequency standards.