Study of Accuracy and Stability of Sr Lattice Clocks at LNE-SYRTE

In this paper, we describe the operation of two optical lattice clocks operated at LNE-SYRTE. They feature an accuracy down to 2.1 ×10
^-17
, and each clock has a fractional frequency stability of 7×10
^-16
/√(τ). We propose the updated accuracy budget of these clocks, with specific evaluations of the lattice-induced effect, as well as the characterization of a spurious systematic effect due to electric cross-talk between the clocks cycle and the clock laser that was recently observed. Reliably operating these two clocks led to the first contribution of an optical clock to TAI. Finally, we report on a non-destructive detection scheme aiming at improving the clock stability.