Recent progress in optical lattice clocks requires unprecedented precision in controlling systematic uncertainties at the 10^-18 level. Tuning of nonlinear light shifts is shown to reduce lattice-induced clock shift for a wide range of lattice intensity. Based on theoretical multipolar, nonlinear, anharmonic, and higher-order light shifts, we numerically demonstrate possible strategies for Sr, Yb, and Hg clocks to achieve lattice-induced systematic uncertainty below 1×10^-18.
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Katori et al. (2015) studied this question.
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