Realization of Closed-Loop Operation of Optical Lattice Clock Based on ^171Yb

We report the realization of closed-loop operation of an optical lattice clock based on ^171Yb atoms. We interrogate the ^1\!S_0\rightarrow^3\!\!P_0 clock transition using single Rabi pulses of 578 nm laser light. The two \pi-transitions from m_F=\pm1/2 ground states are alternatively interrogated, and the clock laser frequency is locked to the center of the two resonances. The in-loop error signal stability of the clock reaches 3\times10^-17 for an average time of 3500 s. We also perform interleaved operations of the clock with two independent servo loops, and the fractional frequency difference averages down to 2\times10^-16 in 7200 s.