“Quantum sensing” describes the use of a quantum system, quantum properties, or quantum
phenomena to perform a measurement of a physical quantity. Historical examples of …

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 describe an optical atomic clock based on quantum-logic spectroscopy of the S 0 1↔ P
3 0 transition in Al+ 27 with a systematic uncertainty of 9.4× 10-19 and a frequency stability …

A quantum repeater node is presented based on trapped ions that act as single-photon
emitters, quantum memories, and an elementary quantum processor. The node's ability to …

Optical atomic clocks are our most precise tools to measure time and frequency,–. Precision
frequency comparisons between clocks in separate locations enable one to probe the space …

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

We have constructed an optical clock with a fractional frequency inaccuracy of 8.6× 10-18,
based on quantum logic spectroscopy of an Al+ ion. A simultaneously trapped Mg+ ion …

Time has always had a special status in physics because of its fundamental role in
specifying the regularities of nature and because of the extraordinary precision with which it …

Atomic polarization phenomena impinge upon a number of areas and processes in physics.
The dielectric constant and refractive index of any gas are examples of macroscopic …

Optical spectroscopy in the gas phase is a key tool for elucidating the structure of atoms and
molecules and their interaction with external fields. The line resolution is usually limited by a …