17 projects
Quantum engineered states for optical clocks and atomic sensors (QESOCAS)

The stability of atomic clocks operating in the optical domain is currently limited by two factors: the frequency noise of the laser used to probe the atomic system and the quantum projection noise, which intervenes when the state of this system is detected. This European QESOCAS project addresses these factors that limit uncertainties at the 10-18 level. These studies could have an impact on most clock applications and open the possibility of new applications.

Traceability for surface spectral solar ultraviolet radiation

The European project, coordinated by the SFI-Davos (Switzerland), aims to develop methods for measuring direct, diffuse and global solar spectral irradiance between 290 nm and 400 nm with an uncertainty of 1% to 2% and new instruments for rapid measurement of spectral irradiance (UV to TF spectroradiometers) to take into account rapid variations in atmospheric conditions (measurement duration less than 10 s and repetition time less than 1 min).