A strontium lattice clock with 3 × 10 − 17 ?> inaccuracy and its frequency

By Stephan Falke, N. Lemke, C. Grebing, B. Lipphardt, Stefan Weyers, V. Gerginov, N. Huntemann, C. Hagemann, A. Al-Masoudi, S. Häfner and 3 more. 2013

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We have measured the absolute frequency of the optical lattice clock based on 87Sr at PTB with an uncertainty of 3.9 × 10 − 16 ?> using two caesium fountain clocks. This is close to the accuracy of todayʼs best realizations of the SI second. The absolute frequency of the 5 s2 1S0 – 5s5p 3P0 transition in 87Sr is 429 228 004 229 873 ?> .13(17) Hz. Our result is in excellent agreement with recent measurements performed in different laboratories worldwide. We improved the total systematic uncertainty of our Sr frequency standard by a factor of five and reach 3 × 10 − 17 ?> , opening new prospects for frequency ratio measurements between optical clocks for fundamental research, geodesy or optical clock evaluation.

Subfields: Atomic and Molecular Physics, and Optics, Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/d109d54b2516d8e6592a83228e183d05552a9a4b