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 …

Recent developments in frequency metrology and optical clocks have been based on
electronic transitions in atoms and singly charged ions as references. The control over all …

Laboratory optical atomic clocks achieve remarkable accuracy (now counted to 18 digits or
more), opening possibilities for exploring fundamental physics and enabling new …

Quantum communications promise to revolutionize the way information is exchanged and
protected. Unlike their classical counterpart, they are based on dim optical pulses that …

The development of precise atomic clocks plays an increasingly important role in modern
society. Shared timing information constitutes a key resource for navigation with a direct …

Microwave photonics offers transformative capabilities for ultra-wideband electronic signal
processing and frequency synthesis with record-low phase noise levels. Despite the intrinsic …

Within the last decade, optical atomic clocks have surpassed the best cesium clocks, which
are used to realize the unit of time and frequency, in terms of accuracy and stability by about …

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

Over the past four years, there has been a surge of activity in the supercontinuum field since
the introduction of various types of microstructure fibers. The main reason for this great …

We investigate simultaneously the temporal and optical and radio-frequency spectral
properties of parametric frequency combs generated in silicon-nitride microresonators and …