Optical atomic clocks represent the state of the art in the frontier of modern measurement
science. In this article a detailed review on the development of optical atomic clocks that are …

Optical atomic clocks, due to their unprecedented stability,–and uncertainty,,–, are already
being used to test physical theories, and herald a revision of the International System of …

The last decade has witnessed tremendous progress in research on optical frequency
metrology. Optical frequency standards using optical lattice and single-ion trap technologies …

The pursuit of ever more precise measures of time and frequency motivates redefinition of
the second in terms of an optical atomic transition. To ensure continuity with the current …

We report the absolute frequency measurement of the unperturbed optical clock transition 1
S 0–3 P 0 in 171 Yb performed with an optical lattice frequency standard. Traceability to the …

We present a measurement of the absolute frequency of the 5 s 2 1 S 0 to 5s5p 3 P 0
transition in 87 Sr which is a secondary representation of the SI second. We describe the …

We report the absolute frequency measurement of the unperturbed transition ${{}^{1}}{{\text
{S}} _ {0}} $–${{}^{3}}{{\text {P}} _ {0}} $ at 578 nm in 171 Yb realized in an optical lattice …

We report a measurement of the absolute frequency of the 1 S 0–3 P 0 transition in the 171
Yb optical lattice clock at KRISS (KRISS-Yb1) for 14 months, which was referenced to the SI …

Optical lattice clocks surpass primary Cs microwave clocks in frequency stability and
accuracy, and are promising candidates for a redefinition of the second in the International …

We measured the absolute frequency of the optical clock transition 1 S 0 (F= 1/2)–3 P 0 (F=
1/2) of 171 Yb atoms confined in a one-dimensional optical lattice and it was determined to …