Sr lattice clock at 1x10^{-16} fractional uncertainty by remote optical evaluation with a Ca clock

Details Sr lattice clock at 1x10^{-16} fractional uncertainty by remote optical evaluation with a Ca clock Sr lattice clock at 1x10^{-16} fractional uncertainty by remote optical evaluation with a Ca clock

2008-01-28

arxiv.org/abs/0801.4344v2

Science 319, 1805 (2008)

Physics

Atomic Physics

To be published in Science, 2008

Scientific paper

10.1126/science.1153341

Optical atomic clocks promise timekeeping at the highest precision and accuracy, owing to their high operating frequencies. Rigorous evaluations of these clocks require direct comparisons between them. We have realized a high-performance remote comparison of optical clocks over km-scale urban distances, a key step for development, dissemination, and application of these optical standards. Through this remote comparison and a proper design of lattice-confined neutral atoms for clock operation, we evaluate the uncertainty of a strontium (Sr) optical lattice clock at the 1x10-16 fractional level, surpassing the best current evaluations of cesium (Cs) primary standards. We also report on the observation of density-dependent effects in the spin-polarized fermionic sample and discuss the current limiting effect of blackbody radiation-induced frequency shifts.

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