Optical clocks have been demonstrated to be good choices to redefine the SI ``second.'' With this goal, we have constructed a quantum-logic-based ²⁷Al⁺ ion optical clock with a fractional frequency uncertainty of 1.6×10^-18. A ²⁵Mg⁺ ion is used as the logic ion for sympathetic cooling, state readout, and frequency-shift measurement of the ²⁷Al⁺ ion. The stability of the optical clock is 2.6×10^-15/√τ, measured with a self-comparison method.
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Ma et al. (2024) studied this question.
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