Sommaire:

The interaction between the electromagnetic field and matter, either solid state or cold atomic systems, is one of the most fundamental and ubiquitous physical processes. As a transparent or reflective media can be used as tools to generate non-trivial states of light, the latter can be used for the implementation of reversible quantum state mapping between light and matter. As a result of this interplay, the study of light-matter interactions has yielded an amazing variety of quantum information networking applications. In this talk, I will discuss two different light-matter interfaces: ensembles of cold neutral atoms for the controlled transport of single-photon pulses, and excitons-polaritons in solid stated systems for the generation of non-classical states of light.

Due to collective nature of the light-atom interaction, the coupling of atomic ensembles and light modes can be highly efficient. Moreover, due to the large optical density in an atomic cloud, it becomes possible to control the light propagation and storage in such medium. In this work, I will discuss light transport in the dense system of atoms, when the average distance between atoms is comparable with the radiative wavelength and the dipole-dipole interaction plays an important role. The light scattering in such dense atomic configuration is described in terms of microscopic approach based on the standard T-matrix formalism.

A comparable strong light-matter interaction can be also achieved in solid-state systems, in the form of exciton-polaritons. This bosonic quasi-particle can be considered as a hybryd between light and matter and exhibits promising properties for investigating various fascinating physical effects. In this context, I will discuss possible stochastic exciton-photon transformations in bosonic condensates of exciton-polaritons that can lead to the generation of non-classical state of light. The role of the stochastic conversions will be discussed in terms of exciton-photon correlation functions.

Pour plus d'informations, merci de contacter Antezza M.