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

  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},
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… 
1 Citations

Scalable Quantum Logic Spectroscopy.

In quantum logic spectroscopy (QLS), one species of trapped ion is used as a sensor to detect the state of an otherwise inaccessible ion species. This extends precision measurements to a broader




For a small driven system coupled strongly to a heat bath, internal energy and exchanged heat are identified such that they obey the usual additive form of the first law. By identifying this exchanged

Evaluation of blackbody radiation shift with 2 × 10−18 uncertainty at room temperature for a transportable 40Ca+ optical clock

Blackbody radiation (BBR) temperature and its uncertainty mainly contribute to the BBR shift uncertainty, which is one of the challenges in most ion optical clocks. Here, an improved BBR temperature

Investigation of experimental issues concerning successful operation of quantum-logic-based $$^{27}\hbox {Al}^+$$ ion optical clock

Successful operations of quantum-logic-based $$^{27}\hbox {Al}^+$$ ion optical clocks have been reported by several groups. But there are still several lingering issues. The first is the proper

Test of general relativity by a pair of transportable optical lattice clocks

A clock at a higher altitude ticks faster than one at a lower altitude, in accordance with Einstein’s theory of general relativity. The outstanding stability and accuracy of optical clocks, at 10 −18

On a definition of the SI second with a set of optical clock transitions

The current SI second based on the atomic hyperfine transition in the ground state of 133Cs is expected to be replaced by a new definition based on optical frequency standards, whose estimated

Sympathetic sideband cooling of a 40Ca+–27Al+ pair toward a quantum logic clock

We achieve the sympathetic sideband cooling of a 40Ca+–27Al+ pair. Both axial modes of the two-ion chain are cooled simultaneously to near the ground state of the motion. The center of mass mode is

Towards a transportable aluminium ion quantum logic optical clock.

A transportable optical clock based on a single trapped aluminum ion, which is interrogated via quantum logic spectroscopy, is developed, employing singly charged calcium as the logic ion for sympathetic cooling, state preparation, and readout.

Advances in the accuracy, stability, and reliability of the PTB primary fountain clocks

Improvements of the systematic uncertainty, frequency instability, and long-term reliability of the two caesium fountain primary frequency standards CSF1 and CSF2 at PTB (Physikalisch-Technische

Minimization of ion micromotion in a Paul trap

Micromotion of ions in Paul traps has several adverse effects, including alterations of atomic transition line shapes, significant second-order Doppler shifts in high-accuracy studies, and limited