A strontium lattice clock with $3\times 10^{-17}$ inaccuracy and its frequency

Stephan Falke, Nathan Lemke, Christian Grebing +10

We have measured the absolute frequency of the optical lattice clock based on ${}^{87}$Sr at PTB with an uncertainty of $3.9\times 10^{-16}$ using two caesium fountain clocks. This i…