Two physicists (a female and male) working on a lab experiment

ALP Seminar - Many-particle entanglement and quantum metrology with fiber cavities

Seminars and colloquia
Simpkins Lee
Beecroft Building

Prof. Jakob Reichel (Sorbonne)
Kastler Brossel Laboratory
Atom Chips Group


Seminar series
ALP seminar
Knowledge of physics?
Yes, knowledge of physics required
For more information contact


Many-particle entanglement is a resource for almost all quantum technologies, but also an active research subject of its own. One powerful way of creating entanglement in a collection of quantum emitters (such as cold or thermal atoms) is to couple them to a single mode of radiation in a cavity. I will discuss how fiber Fabry-Perot microcavities have enabled new ways of entanglement generation and analysis, and how we have recently used them to create spin-squeezed states in an atomic clock with ultracold rubidium atoms. In this experiment in collaboration with the French national metrology laboratory SYRTE, the coherence time of these multiparticle-entangled states reaches 600ms, more than two orders of magnitude longer than in earlier experiments.