Evaluation of the systematic shifts of a $${}^{40}\text {Ca}^{+}$$–$${}^{27}\text {Al}^{+}$$ optical clock

@article{Cui2022EvaluationOT,
  title={Evaluation of the systematic shifts of a \$\$\{\}^\{40\}\text \{Ca\}^\{+\}\$\$–\$\$\{\}^\{27\}\text \{Al\}^\{+\}\$\$ optical clock},
  author={Kaifeng Cui and Si-jia Chao and Chenglong Sun and Shao-mao Wang and Ping Zhang and Yuan-fei Wei and Jinbo Yuan and Jian Cao and Hua-lin Shu and Xue-ren Huang},
  journal={The European Physical Journal D},
  year={2022}
}
Quantum-logic-based 27 Al + optical clock has been demonstrated in several schemes as there are dif-ferent choices of the auxiliary ion species. In this paper, we present the first detailed evaluation of the systematic shift and the total uncertainty of an 27 Al + optical clock sympathetically cooled by a 40 Ca + ion. The total systematic uncertainty of the 40 Ca + − 27 Al + quantum logic clock has been estimated to be 7 . 9 × 10 − 18 , which was mainly limited by the uncertainty of the… 
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