A 27Al+ quantum-logic clock achieves 5.5×10^-19 total fractional uncertainty and 3.5×10^-16/√τ stability, the lowest reported clock uncertainty.
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High-Stability Single-Ion Clock with $5.5\times10^{-19}$ Systematic Uncertainty
A 27Al+ quantum-logic clock achieves 5.5×10^-19 total fractional uncertainty and 3.5×10^-16/√τ stability, the lowest reported clock uncertainty.