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- W2912476752 abstract "We recently reported a $^{40}{mathrm{Ca}}^{+}$ optical clock comparison with an uncertainty at $5.5ifmmodetimeselsetexttimesfi{}{10}^{ensuremath{-}17}$, mainly limited by the excess micromotion shift. Here we report the progress made to reduce this shift and its uncertainty below $1ifmmodetimeselsetexttimesfi{}{10}^{ensuremath{-}18}$ by precise measurement of the ``magic'' rf drive frequency ${mathrm{ensuremath{Omega}}}_{0}$ at which the micromotion-induced scalar Stark shift and second-order Doppler shift cancel each other. ${mathrm{ensuremath{Omega}}}_{0}$ is measured as $2ensuremath{pi}ifmmodetimeselsetexttimesfi{}24.801(2)phantom{rule{0.28em}{0ex}}mathrm{MHz}$, and the differential static scalar polarizability $mathrm{ensuremath{Delta}}{ensuremath{alpha}}_{0}$ of the $^{40}{mathrm{Ca}}^{+}$ ion clock transition is measured as $ensuremath{-}7.2677(21)ifmmodetimeselsetexttimesfi{}{10}^{ensuremath{-}40}phantom{rule{0.28em}{0ex}}mathrm{J}phantom{rule{0.16em}{0ex}}{mathrm{m}}^{2}phantom{rule{0.16em}{0ex}}{mathrm{V}}^{ensuremath{-}2}$. The blackbody radiation shift is then calculated to be 0.37913(12) Hz at 300 K considering the dynamic correction. The contribution of the blackbody shift coefficient to the uncertainty of the optical clock at room temperature has been reduced to the $3ifmmodetimeselsetexttimesfi{}{10}^{ensuremath{-}19}$ level. With further improvements made to reduce the servo error, the total clock uncertainty is reduced to $2.2ifmmodetimeselsetexttimesfi{}{10}^{ensuremath{-}17}$, limited by the blackbody radiation field evaluation." @default.
- W2912476752 created "2019-02-21" @default.
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- W2912476752 date "2019-01-22" @default.
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- W2912476752 title "<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mmultiscripts><mml:msup><mml:mrow><mml:mi>Ca</mml:mi></mml:mrow><mml:mo>+</mml:mo></mml:msup><mml:mprescripts /><mml:none /><mml:mn>40</mml:mn></mml:mmultiscripts></mml:math> ion optical clock with micromotion-induced shifts below <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mrow><mml:mn>1</mml:mn><mml:mo>×</mml:mo><mml:msup><mml:mn>10</mml:mn><mml:mrow><mml:mo>−</mml:mo><mml:mn>18</mml:mn></mml:mrow></mml:msup></mml…" @default.
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- W2912476752 doi "https://doi.org/10.1103/physreva.99.011401" @default.
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