Atomic high-precision measurements have become a competitive and essential technique
for tests of fundamental physics, the Standard Model, and our theory of gravity. It is therefore …

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 …

Laser cooling typically requires one or more repump lasers to clear dark states, which
complicates experimental setups, especially for systems with multiple repumping …

Laser cooling typically requires one or more repump lasers to clear dark states and enable
recycling transitions. Here, we have achieved cooling of Be+ ions using a single laser beam …

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 …

By measuring the frequencies emitted as atoms transition between energy levels, atomic
frequency standards are among the most advanced devices available for keeping time …

SummaryThe ion microwave frequency standard is a candidate for the next generation of
practical microwave frequency standards, which has a very wide application potential …