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Optical atomic clocks promise timekeeping at the highest precision andaccuracy, owing to their high operating frequencies. Rigorous evaluations ofthese clocks require direct comparisons between them. We have realized ahigh-performance remote comparison of optical clocks over km-scale urbandistances, a key step for development, dissemination, and application of theseoptical standards. Through this remote comparison and a proper design oflattice-confined neutral atoms for clock operation, we evaluate the uncertaintyof a strontium (Sr) optical lattice clock at the 1x10-16 fractional level,surpassing the best current evaluations of cesium (Cs) primary standards. Wealso report on the observation of density-dependent effects in thespin-polarized fermionic sample and discuss the current limiting effect ofblackbody radiation-induced frequency shifts.

Sr lattice clock at 1x10^{-16} fractional uncertainty by remote optical evaluation with a Ca clock