Frequency comparison of two high-accuracy Al+ optical clocks.

By C. Chou, D. Hume, J. Koelemeij, David J. Wineland, T. Rosenband. Physical Review Letters, 2009

825 citations recorded by the source corpus.

We have constructed an optical clock with a fractional frequency inaccuracy of 8.6x10{-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 {1}S{0}<-->{3}P{0} clock transition is compared to that of a previously constructed Al+ optical clock with a statistical measurement uncertainty of 7.0x10{-18}. The two clocks exhibit a relative stability of 2.8x10{-15}tau{-1/2}, and a fractional frequency difference of -1.8x10{-17}, consistent with the accuracy limit of the older clock.

Subfields: Atomic and Molecular Physics, and Optics

View Paper: https://www.semanticscholar.org/paper/63e8d7bbe52f64fd0d77333061b85bd59fe6f7d1

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In Atomic and Molecular Physics, and Optics

Citations in the corpus

Highly charged ions: Optical clocks and applications in fundamental physics (2018, background): “Heating of the ion during interrogation can increase the shift and result in additional uncertainty, making this shift one of the largest contributions to the uncertainty budget, e.g. of the Al+ and Yb+ clocks (Chou et al., 2010; Huntemann et al., 2016; Rosenband et al., 2008).”
Towards a Re-definition of the Second Based on Optical Atomic Clocks (2015, background): “ accuracy limited by the standards themselves. In the simplest case two independent clocks of the same type are operated in the same laboratory in the 10 18 regime like in the case of the 27Al+ clock [9] or the Sr lattice clock [27]. The numerical value of frequency ratios measured between optical c”
Cryogenic optical lattice clocks (2015, methodology): “Figure 2a shows the clock excitation spectra obtained by simultaneously scanning the clock laser frequencies of Sr-1 (maintained at T1 = 95 K, blue circles) and Sr-2 (at T2 = 296 K, orange circles) with 400-ms-long π-pulse excitation, which resolved a roomtemperature BBR shift of ∼2 Hz.”
A sub-40-mHz-linewidth laser based on a silicon single-crystal optical cavity (2011, background): “2(1) K, with the dominating uncertainty arising from sensor calibration.”