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A number of cesium atomic fountain primary frequency standards (PFS) realizing the International System (SI) second are contributing to the International Atomic Time (TAI). The accuracy of recent Cs fountain frequency standards reach low 10−16 level [1-3]. Since 2010 we have been developing a Cs/Rb dual fountain frequency standard, KRISS-F1 [4]. Currently we operate KRISS-F1 as only a Cs fountain...
Recently the optical lattice clocks (OLCs) based on neutral atoms are leading the progress of clock research [1, 2]. As the optical lattice clock has a prominent short-term stability compared to the microwave clock and the ion clock intrinsically, it can contribute greatly to many fields such as precision measurement, fundamental science, astronomy, future industry, re-definition of the Second, and...
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