Optical frequency combs were developed nearly two decades ago to support the world's
most precise atomic clocks. Acting as precision optical synthesizers, frequency combs …

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 …

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 …

Photonic synthesis of radiofrequency (RF) waveforms revived the quest for unrivalled
microwave purity because of its ability to convey the benefits of optics to the microwave …

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

Phase compensated optical fiber links enable high accuracy atomic clocks separated by
thousands of kilometers to be compared with unprecedented statistical resolution. By …

Solid-state quantum emitters are in high demand for emerging technologies such as
advanced sensing and quantum information processing. Generally, these emitters are not …

High-precision measurements with molecules may refine our knowledge of various fields of
physics, from atmospheric and interstellar physics to the standard model or physics beyond …

Laser frequency combs emit a spectrum with hundreds of thousands of evenly spaced
phase-coherent narrow lines. A comb-enabled instrument, the dual-comb interferometer …

Very-long-baseline interferometry (VLBI) for high-resolution astronomical imaging requires
phase-stable frequency references at widely separated radio-telescope antennas. For the …