^{27}Al^{+} Quantum-Logic Clock with a Systematic Uncertainty below 10^{-18}.
Samuel M. Brewer,Samuel M. Brewer,Jwo-Sy Chen,Jwo-Sy Chen,A. M. Hankin,A. M. Hankin,Ethan Clements,Ethan Clements,Chin-Wen Chou,David J. Wineland,David J. Wineland,David J. Wineland,David Hume,David R. Leibrandt,David R. Leibrandt +14 more
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TLDR
In this article, an optical atomic clock based on quantum-logic spectroscopy of the S 0↔ −3 P 0 transition in Al −+ was proposed, with a systematic uncertainty of 9.4×10 −19 and a frequency stability of 1.2×10−15 −15/sqrt[τ].Abstract:
We describe an optical atomic clock based on quantum-logic spectroscopy of the ^{1}S_{0}↔^{3}P_{0} transition in ^{27}Al^{+} with a systematic uncertainty of 9.4×10^{-19} and a frequency stability of 1.2×10^{-15}/sqrt[τ]. A ^{25}Mg^{+} ion is simultaneously trapped with the ^{27}Al^{+} ion and used for sympathetic cooling and state readout. Improvements in a new trap have led to reduced secular motion heating, compared to previous ^{27}Al^{+} clocks, enabling clock operation with ion secular motion near the three-dimensional ground state. Operating the clock with a lower trap drive frequency has reduced excess micromotion compared to previous ^{27}Al^{+} clocks. Both of these improvements have led to a reduced time-dilation shift uncertainty. Other systematic uncertainties including those due to blackbody radiation and the second-order Zeeman effect have also been reduced.read more
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Systematic evaluation of an atomic clock at 2 × 10 −18 total uncertainty
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