4.4 Article

Optical frequency ratio of a 171Yb+ single-ion clock and a 87Sr lattice clock

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Summary: The optical lattice clock NICT-Sr1 calibrates the international timescale TAI and determines the absolute frequency of the Sr-87 clock transition to be 429 228 004 229 873.082 Hz, with a high level of precision approaching the systematic limits of the best realization of the SI second. This result is consistent with other recent measurements and is further supported by loop closure over the absolute frequencies of Sr-87, Yb-171, and direct optical measurements of their ratio.

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