研究目的
Investigating the performance of ytterbium optical lattice clocks, including their frequency stability, uncertainty, and reproducibility at the 10-18 fractional level.
研究成果
The ytterbium optical lattice clocks at NIST have demonstrated state-of-the-art levels in stability, uncertainty, and reproducibility, with a total systematic uncertainty for each clock of <2x10-18. The study highlights initial results in the measurements of optical frequency ratios with other optical clocks at NIST and mentions efforts towards an improved optical local oscillator and a portable Yb standard.
研究不足
The study acknowledges that the clock uncertainty only includes systematic effects that have been actively considered, representing a best-effort estimate of the actual uncertainty in realizing the unperturbed atomic clock transition frequency.
