We propose a new frequency standard based on a 4 f 14 6 s 6 p P 0 3-4 f 13 6 s 2 5 d (J= 2)
transition in neutral Yb. This transition has a potential for high stability and accuracy and the …

We address the problem of the lattice Stark shifts in the Sr clock caused by the multipolar M
1 and E 2 atom-field interactions and by the term nonlinear in lattice intensity and …

We investigate the contribution of negative-energy states on the E 2 and M 1 polarizabilities
for the S 0 1 and P 0 3 states of the Sr clock and find that they dominate the E 2-M 1 …

Rubidium two-photon frequency standards are emerging as powerful contenders for
compact, durable devices with exceptional stability. The field has focused on single-color …

The progress in optical clocks with uncertainty at a level of 10− 18 requires unprecedented
precision in estimating the contributions of multipolar and higher-order effects of atom-field …

Progress in atomic optical clocks with total uncertainty of 10− 18 or below requires a precise
estimation of multipolar and higher-order effects due to atom-field interactions. Magnesium …

The pursuit of a systematic frequency uncertainty beyond 10− 18 clock has triggered a
multitude of investigations on the multipolar and higher-order lattice light shifts. The Cd atom …

With the improvement of high-precision optical clock, the higher-order multipolar interaction
between atoms and light needs quantitative evaluation. However for the Sr clock, the …

The energy levels and electric dipole (E1) matrix elements of the ground state and low-lying
excited states of Be atoms are calculated using the relativistic configuration interaction plus …

Current state-of-the-art frequency standards are passive optical atomic clocks where the
frequency of an optical resonator is stabilized to a narrow atomic transition. Passive clocks …