A transportable 40Ca+ single-ion clock with $7.7\times 10^{-17}$ systematic uncertainty

@inproceedings{Cao2016AT4,
  title={A transportable 40Ca+ single-ion clock with \$7.7\times 10^\{-17\}\$ systematic uncertainty},
  author={Jian Cao and Ping Zhang and Jun-juan Shang and Kai-feng Cui and Jinbo Yuan and Si-jia Chao and Shao-mao Wang and Hua-lin Shu and Xue-ren Huang},
  year={2016}
}
: A transportable optical clock refer to the 4s 2 S 1/2 -3d 2 D 5/2 electric quadrupole transition at 729 nm of single 40 Ca + trapped in mini Paul trap has been developed. The physical system of 40 Ca + optical clock is re-engineered from a bulky and complex setup to an integration of two subsystems: a compact single ion unit including ion trapping and detection modules, and a compact laser unit including laser sources, beam distributor and frequency reference modules. Apart from the… 

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TLDR
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