Pulsed optically pumped (POP) Rb atomic clock is considered to be a powerful technique for
the Rb atomic clock due to the capability of light-shift mitigation and atomic spectroscopy …

We reported the realization of a 174 Yb+–113 Cd+ bi-species Coulomb crystal comprising
174 Yb+, a heavier ion, as coolant and verified the potential of applying a coolant ion with a …

We present the determination of the ground-state hyperfine splitting (⁠ ν HFS⁠) in laser-
cooled 171 Yb+ ions using our microwave quantum frequency standard (QFS). Employing …

The accurate evaluation of the second-order Doppler frequency shift (SODFS) of trapped
ions in a linear Paul trap has been studied with experiments and molecular dynamics (MD) …

We report the determination of the Landé g J factor and Zeeman coefficients for the ground-
state of 171 Yb+, relevant to microwave quantum frequency standards (QFSs). The g J factor …

Precision determination of the hyperfine splitting of cadmium ions is essential to study space-
time variation of fundamental physical constants and isotope shifts. In this work, we present …

As a candidate for the next generation microwave clock, microwave atomic clocks based on
trapped ions are currently studied worldwide. Since 2010, our team at Tsinghua University …

We report precise measurement of the hyperfine splitting and calculation of the Zeeman
coefficients of the $^{171} $ Yb $^+ $ ground state. The absolute hyperfine splitting …

We reported the realization of a $^{174}\mathrm {Yb}^+ $-$^{113}\mathrm {Cd}^+ $ bi-
species Coulomb crystal comprising $^{174}\mathrm {Yb}^+ $ ions as coolant and verified …

We have developed a system to stabilize the laser frequency by locking the laser to the
hyperfine transitions of iodine molecules. The frequency stability of 5× 10-12 is observed …