Frequency ratio of Yb and Sr clocks with 5 × 10−17 uncertainty at 150 seconds averaging time
By Nils Nemitz, T. Ohkubo, Masao Takamoto, Ichiro Ushijima, M. Das, N. Ohmae, Hidetoshi Katori. Nature Photonics, 2016
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The most accurate ratio of the clock transition frequencies between Yb and Sr is measured by using a pair of cryogenic optical lattice clocks. Through common mode rejection of the clock laser noise, a uncertainty of 4.6 × 10−17 is achieved in 150 seconds. Transition frequencies of atoms and ions are among the most accurately accessible quantities in nature, playing important roles in pushing the frontiers of science by testing fundamental laws of physics, in addition to a wide range of applications such as satellite navigation systems. Atomic clocks based on optical transitions approach uncertainties of 10−18 (refs 1–3), where full frequency descriptions are far beyond the reach of the SI second. Direct measurements of the frequency ratios of such super clocks, on the other hand, are not subject to this limitation4,5,6,7,8. They can verify consistency and overall accuracy for an ensemble of super clocks, an essential step towards a redefinition of the second9. Here we report a measurement that finds the frequency ratio of neutral ytterbium and strontium clocks to be ℛ = 1.207507039343337749(55), with a fractional uncertainty of 4.6 × 10−17 and a measurement instability as low as 4 × 10−16 (τ/s)−1/2.
Subfields: Atomic and Molecular Physics, and Optics, Surgery
View Paper: https://www.semanticscholar.org/paper/ee7df003049cb88d11978f5679fd92b5b6fd7e6f
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In Atomic and Molecular Physics, and Optics
Citations in the corpus
- Search for New Physics with Atoms and Molecules (2017, background): “(Nemitz et al., 2016) are reaching into relative frequency instability levels of a part in 10(18), promising a boost in the sensitivity of dilaton searches by about two orders of magnitude in the near future.”