Caroline CHAMPENOIS :"Laser cooling and coherent population trapping in a trapped ion cloud""

We will have the pleasure to welcome Dr Caroline Champenois, PIIM, CNRS and Aix-Marseille University, Friday April 4th at 11 am in amphi E. du Chatelet (SUPMICROTECH-ENSMM) for seminar on :

"Laser cooling and coherent population trapping in a trapped ion cloud"

Abstract : Laser-cooled trapped ions in radio-frequency traps are among the best controlled quantum system. The ultimate precision reached in the control of their internal and external state is illustrated in the optical clocks based on single ions (or couple of ions) and in the quantum simulations and computations processed on few ions or a chain of ions. Nevertheless, large ion clouds remain a very relevant choice when a large number of emitters are required like for microwave frequency standards or quantum optics in the large cooperative regime. In our group, we are exploring a midway between optical and microwave spectroscopy, through THz spectroscopy based on coherent population trapping in a 3D laser ion cloud [1]. In this experiment, the ion cloud can be regarded as a non-neutral plasma and we can take benefit of the different spectrocopy processes to study plasma properties that are otherwise very difficult to measure, like self-diffusion [2].