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 …

We review the most recent progress in ultralow-noise mode-locked fiber lasers and fiber-
based frequency-comb sources. With the rapid progress in theory, measurement, and …

We present improved constraints on the coupling of ultralight bosonic dark matter to photons
based on long-term measurements of two optical frequency ratios. In these optical clock …

We search for ultralight scalar dark matter candidates that induce oscillations of the fine
structure constant, the electron and quark masses, and the quantum chromodynamics …

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 …

Ultrastable lasers are essential tools in optical frequency metrology enabling unprecedented
measurement precision that impacts on fields such as atomic timekee**, tests of …

Strontium optical lattice clocks have the potential to simultaneously interrogate millions of
atoms with a high spectroscopic quality factor of 4× 1017. Previously, atomic interactions …

The pursuit of better atomic clocks has advanced many research areas, providing better
quantum state control, new insights in quantum science, tighter limits on fundamental …

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 …

Leveraging the unrivalled performance of optical clocks as key tools for geo-science, for
astronomy and for fundamental physics beyond the standard model requires comparing the …