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The exquisite control exhibited over quantum states of individual particleshas revolutionized the field of precision measurement, as exemplified by themost accurate atomic clock realized in single trapped ions. Whereas many-atomlattice clocks have shown advantages in measurement precision over trapped-ionclocks, their accuracy has remained 20 times worse. Here we demonstrate, forthe first time, that a many-atom system achieves accuracy (6x10^{-18}) betterthan a single ion-based clock, with vastly reduced averaging times (3000 s).This is the first time a single clock has achieved the best performance in allthree key ingredients necessary for consideration as a primary standard -stability, reproducibility, and accuracy. This work paves the way for futureexperiments to integrate many-body quantum state engineering into the frontiersof quantum metrology, creating exciting opportunities to advance precisionbeyond the standard quantum limit. Improved frequency standards will haveimpact to a wide range of fields from the realization of the SI units, thedevelopment of quantum sensors, to precision tests of the fundamental laws ofnature.

An Optical Lattice Clock with Accuracy and Stability at the $10^{-18}$ Level