High accuracy correction of blackbody radiation shift in an optical lattice clock

Abstract

We have determined the frequency shift that blackbody radiation is inducing on the $5s^2$ ${}^1$S${}_0$ -- $5s5p$ ${}^3$P${}_0$ clock transition in strontium. Previously its uncertainty limited the uncertainty of strontium lattice clocks to $1\times 10^{-16}$. Now the uncertainty associated to the black body radiation shift correction translates to $5\times 10^{-18}$ relative frequency uncertainty at room temperature. Our evaluation is based on a measurement of the differential dc-polarizability of the two clock states and on a modeling of the dynamic contribution using this value and experimental data for other atomic properties.

arXiv comment9 pages, 4 figures, including appendix with supplementary text. Version 2 with adjusted value of differential static polarizability due to field plate separation measurement

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