A cryogenic optical lattice clock with a rotating radiation shield reaches a blackbody-radiation shift uncertainty of 1.7e-20 and directly measures ytterbium's leading BBR dynamic correction.
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Cryogenic Optical Lattice Clock with $1.7\times 10^{-20}$ Blackbody Radiation Stark Uncertainty
A cryogenic optical lattice clock with a rotating radiation shield reaches a blackbody-radiation shift uncertainty of 1.7e-20 and directly measures ytterbium's leading BBR dynamic correction.