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      Geodesy and metrology with a transportable optical clock

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          Is Open Access

          Systematic evaluation of an atomic clock at 2 × 10−18 total uncertainty

          The pursuit of better atomic clocks has advanced many research areas, providing better quantum state control, new insights in quantum science, tighter limits on fundamental constant variation and improved tests of relativity. The record for the best stability and accuracy is currently held by optical lattice clocks. Here we take an important step towards realizing the full potential of a many-particle clock with a state-of-the-art stable laser. Our 87Sr optical lattice clock now achieves fractional stability of 2.2 × 10−16 at 1 s. With this improved stability, we perform a new accuracy evaluation of our clock, reducing many systematic uncertainties that limited our previous measurements, such as those in the lattice ac Stark shift, the atoms' thermal environment and the atomic response to room-temperature blackbody radiation. Our combined measurements have reduced the total uncertainty of the JILA Sr clock to 2.1 × 10−18 in fractional frequency units.
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            Cryogenic optical lattice clocks

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              Frequency Comparison of Two High-Accuracy Al+ Optical Clocks

              We have constructed an optical clock with a fractional frequency inaccuracy of 8.6e-18, based on quantum logic spectroscopy of an Al+ ion. A simultaneously trapped Mg+ ion serves to sympathetically laser-cool the Al+ ion and detect its quantum state. The frequency of the 1S0->3P0 clock transition is compared to that of a previously constructed Al+ optical clock with a statistical measurement uncertainty of 7.0e-18. The two clocks exhibit a relative stability of 2.8e-15/ sqrt(tau), and a fractional frequency difference of -1.8e-17, consistent with the accuracy limit of the older clock.
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                Author and article information

                Journal
                Nature Physics
                Nature Phys
                Springer Nature
                1745-2473
                1745-2481
                February 12 2018
                :
                :
                Article
                10.1038/s41567-017-0042-3
                03895b4d-3992-4618-a8cc-538aefb84547
                © 2018

                http://www.springer.com/tdm

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