We review experimental progress on optical atomic clocks and frequency transfer, and
consider the prospects of using these technologies for geodetic measurements. Today …

Atomic clocks are vital in a wide array of technologies and experiments, including tests of
fundamental physics. Clocks operating at optical frequencies have now demonstrated …

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 …

A list of standard reference frequency values (LoF) of quantum transitions from the
microwave to the optical regime has been recommended by the International Committee for …

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

Transition frequencies of atoms and ions are among the most accurately accessible
quantities in nature, playing important roles in pushing the frontiers of science by testing …

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 …

490 M. Takamoto et al./CR Physique 16 (2015) 489–498 phase. Nous commençons par une
revue des horloges optiques à Sr cryogéniques qui réduisent le décalage de fréquence dû …

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 …

In this paper we report the evaluation of an optical lattice clock based on neutral mercury
with a relative uncertainty of $1.7\times {10}^{-16} $. Comparing this characterized frequency …