Accurate frequency measurements of a narrow optical clock transition in 171Yb atoms trapped in an optical lattice establish this system as a serious contender in the quest to develop increasingly accurate atomic clocks.
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Margolis, H. Lattice clocks embrace ytterbium. Nature Photon 3, 557–558 (2009). https://doi.org/10.1038/nphoton.2009.182
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DOI: https://doi.org/10.1038/nphoton.2009.182
