Sections :

Group Members

Introduction

Research Activities

Documents and publications

Group members
Claude Fabre, Agnès Maître, Thomas Coudreau, Nicolas Treps
Sylvain Gigan, Gaëlle Keller, Julien Laurat, Vincent Delaubert, Laurent Lopez

Visitors
Antonino Chiummo, Jose Augusto O. Huguenin

Introduction

Non linear effects in Chi 2 crystals represent one of the most efficient system to manipulate the quantum fluctuation of light, both temporally and spatially. Indeed, even if it is a weak non-linearity compared to a quasi-resonant interaction with atoms, excess noise is very low. Hence, the limitations in the non-classical properties one can achieve originate mainly from optical losses. Another very interesting characteristic is that a very simple theoretical model gives a faithful description of the system, and one can simply imagine very interesting experiments.

These characteristics lead the group to the design of spatially multimode experiments in the continuous wave regime. We look at the spatial properties of the quantum fluctuations, look for spatial correlations and try to progress in the general field of quantum imaging.

Research activities

The group topics do separate in two branches. On the one hand, we study into details the properties, both classical and quantum, of the parametric interaction. This leads, among others, to the production of non-classical states of the field and to the realisation of quantum information protocols. On the other hand, we look into the quantum description of the transvers plane of the light beam. These researches are inspired from sensitivity problems in high precision measurements.

Quantum imaging
1. Optical parametretric oscillator in a spatially multimode configuration
2. Quantum noise in a spatial soliton
3. Small displacement measurements beyond the shot noise limit

Parametric interaction
1. Réduction du bruit de pompe dans un Oscillateur Paramétrique Optique à quasi-accord de phase
2. Téléportation et information quantique
3. All optical reshaping of noisy telecom signals
4. Conditional measurements

Documents and publications

Some general documents
1. PhD thesis of Nicolas Treps "Effets quantiques dans les images optiques"
2. General presentation on the "quantum limits inoptical imaging" (PDF)

Group publications.