Al+27 Quantum-Logic Clock with a Systematic Uncertainty below 10−18

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Atomic clock performance enabling geodesy below the centimetre level

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Geodetic methods to determine the relativistic redshift at the level of 10 $$^{-18}$$ - 18 in the context of international timescales: a review and practical results

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Sympathetic Ground State Cooling and Time-Dilation Shifts in an Al27+ Optical Clock

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1.5  μm Lasers with Sub-10 mHz Linewidth

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Ultrastable optical clock with two cold-atom ensembles

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Single-Ion Atomic Clock with3×10−18Systematic Uncertainty

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Precise determination of micromotion for trapped-ion optical clocks

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Optical atomic clocks

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Systematic evaluation of an atomic clock at 2 × 10−18 total uncertainty

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Frequency Comparison of Two High-AccuracyAl+Optical Clocks

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Frequency Ratio of Al+ and Hg+ Single-Ion Optical Clocks; Metrology at the 17th Decimal Place

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