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We report on an improved systematic evaluation of the JILA SrI opticallattice clock, achieving a nearly identical systematic uncertainty compared tothe previous strontium accuracy record set by the JILA SrII optical latticeclock (OLC) at $2.1 \times 10^{-18}$. This improves upon the previousevaluation of the JILA SrI optical lattice clock in 2013, and we achieve a morethan twenty-fold reduction in systematic uncertainty to $2.0 \times 10^{-18}$.A seven-fold improvement in clock stability, reaching $4.8 \times10^{-17}/\sqrt{\tau}$ for an averaging time $\tau$ in seconds, allows the clockto average to its systematic uncertainty in under 10 minutes. We improve thesystematic uncertainty budget in several important ways. This includes a novelscheme for taming blackbody radiation-induced frequency shifts through activestabilization and characterization of the thermal environment, inclusion ofhigher-order terms in the lattice light shift, and updated atomic coefficients.Along with careful control of other systematic effects, we achieve low temporaldrift of systematic offsets and high uptime of the clock. We additionallypresent an improved evaluation of the second order Zeeman coefficient that isapplicable to all Sr optical lattice clocks. These improvements in performancehave enabled several important studies including frequency ratio measurementsthrough the Boulder Area Clock Optical Network (BACON), a high precisioncomparison with the JILA 3D lattice clock, a demonstration of a new all-opticaltime scale combining SrI and a cryogenic silicon cavity, and a high sensitivitysearch for ultralight scalar dark matter.

JILA SrI Optical Lattice Clock with Uncertainty of $2.0 \times 10^{-18}$