Compact transportable 171Yb+ single-ion optical fully automated clock with 4.9E-16 relative instability
arXiv:2010.15244
Abstract
The paper describes the results achieved in the development of the compact transportable fully automated optical clock based on a single 171Yb+ ion in a radiofrequency (RF) quadrupole trap. The resulted measurements demonstrated the 4.9E-16 output RF signal relative instability on 1000 s integration time with 298.1 kg weight, 0.921 volume, and 2.766 kW input power consumption of the device. A transformation of the ultrastable optical signal into the RF range was performed via the optical frequency comb with a supercontinuum fiber laser generator. The transformation was conducted without loss of initial stability and accuracy characteristics of the signal.
The paper has several serious issues in the 'Results and discussion' part, and should be withdrawn for time until the issues are fully corrected