Evaluation of the systematic shifts of a ${}^{40}\textrm{Ca}^+{}^{27}\textrm{Al}^+$ optical clock
Abstract
Quantumlogicbased ${}^{27}\textrm{Al}^+$ optical clock has been demonstrated in several schemes as there are different 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 ${}^{27}\textrm{Al}^+$ optical clock sympathetically cooled by a ${}^{40}\textrm{Ca}^+$ ion. The total systematic uncertainty of the ${}^{40}\textrm{Ca}^+  {}^{27}\textrm{Al}^+$ quantum logic clock has been estimated to be $7.9 \times 10^{18}$, which was mainly limited by the uncertainty of the quadratic Zeeman shift. By comparing the frequency of two counterpropagating clock beams on the same ion, we measured the frequency stability to be $3.7 \times 10^{14} /\sqrt{\tau}$.
 Publication:

arXiv eprints
 Pub Date:
 December 2020
 arXiv:
 arXiv:2012.05496
 Bibcode:
 2020arXiv201205496C
 Keywords:

 Physics  Atomic Physics
 EPrint:
 8 pages, 3 figures, 3 tables