Ultra-stable optical oscillators from quantum coherent and entangled systems
Short Name: USOQS, Project Number: 17FUN03
Exploiting optical clocks for time measurement and sensor development
From advanced navigation and telecommunications to radio astronomy and the testing of fundamental physical laws, the most precise and accurate time measurements are required.
To meet these technical challenges, optical clock development is at the forefront of research in this field.
The state-of-the-art technology, however, has its limits: frequency stability of the lasers used in such systems is affected both by thermal noise from mirror coatings and more fundamentally by so-called quantum projection noise (QPN). Advanced quantum-based sensors could also be realised if current technical constraints could be surpassed.
This project implemented, studied and characterised both established and brand-new methods for the development of optical clocks.
To go beyond noise limits and increase frequency stability, multi-particle entanglement of atoms/ions were investigated; this phenomenon could also be exploited for electromagnetic field measurements with enhanced sensitivity.
The project results support future realisations of the SI second through new frequency standards and significantly impact many fields requiring ultra-precise time measurement.
This project builds on from EMRP project EXL01 QESOCAS.
Physical Review A
Physical Review Letters
IEEE Transactions on Instrumentation and Measurement
Optics Express
Proceedings of the National Academy of Sciences
2021 JOINT CONFERENCE OF THE EUROPEAN FREQUENCY AND TIME FORUM AND IEEE INTERNATIONAL FREQUENCY CONTROL SYMPOSIUM
Physical Review A
Optics Express
Europhysics Letters
2021 JOINT CONFERENCE OF THE EUROPEAN FREQUENCY AND TIME FORUM AND IEEE INTERNATIONAL FREQUENCY CONTROL SYMPOSIUM (IEEE EFTF-IFCS 2021)
Physical Review Research
Computer Physics Communications
Proceedings EFTF 2021
Chinese Physics Letters
Applied Optics
Physical Review Letters
Nature Communications
Physical Review X
SciPost Physics