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Optical Clock: Toward 10^{-18} Uncertainty
2010
Physics and High Technology
Atomic energy levels in well-isolated and controlled environments are highly stable and therefore make ideal references for highly accurate frequency standards or clocks. Current definition of a second, since 1967, is based on the Cs hyperfine transition frequency of around 9.2 GHz. After the development of the optical frequency comb, various optical clocks using the optical transition of hundreds of THz show enormous improvements and have now surpassed the best Cs clock in accuracy. In this
doi:10.3938/phit.19.024
fatcat:42fzcgaykvdqjbkc643b646kwy