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As a passionate researcher and teacher, Jean Dalibard has never stopped playing with light and matter, which for him, are "the fundamentals of the physical world". He contributed to the emergence and influence of a new discipline, cold atoms. Throughout his career, including thirty years at the CNRS, this eminent researcher has distinguished himself by the originality of his approach. His theory and experiments are at the heart of atomic physics and radiation research. …

At the occasion of the IFRAF inauguration (Institut Francilien des Atomes Froids) young researchers evoke the main experiences run by their teams. There are done in the continuity of the Claude Cohen-Tannoudji ' s discovers, from the first Bose-Einstein condensates obtained in 1995 to the very last developments.

The physicist Alain Aspect, a director at the Laboratory Charles Fabry, within the Institute of Optics located in Orsay, has received the CNRS Gold medal in 2005 for his works on quantum optics and atomic physics. In this film, he recounts his career and describes his researches. He proved the non-validity of the Bell ' s theorem.

The Ecole normale supérieure (ENS) is the only major educational institution in France which trains both humanists and scientists. This interdisciplinarity and the wide intellectual freedom granted to its students have helped to make it famous. Instruction takes place in thirteen departments or sections, all of which have research laboratories. A number of professors participate in the film, and some recent research is presented, including work done by the laboratory for development and…

Claude Cohen-Tannoudji, winner of a Nobel Prize in physics, presents the research under way in the Kastler Brossel laboratory (Ecole Normale Supérieure, Collège de France): quantum fluctuations, combining of fermions and bosons, and Bose-Einstein condensation of metastable helium.Michèle Leduc, head of research at CNRS, then describes in more detail this latter experiment, which they were able to perform due to a better understanding of cold atoms (atoms slowed down by the use of a laser beam).

Four scientists, Claude Cohen-Tannoudji (Laboratoire Kastler-Brossel, Paris), Sébastien Balibar (Laboratoire de physique statistique, Paris), Sylvie Vauclair (Laboratoire d'astrophysique de l'observatoire Midi-Pyrénées, Toulouse), and Thibault Damour (Département d'astrophysique relativiste et de cosmologie, Meudon) sum up the state of physics at the start of the 21st century and some of the challenges that face researchers: to connect the infinitely large and the infinitely small, to measure…

There are scales for measuring all sorts of things in daily life - but there are also scales for measuring events at times we cannot observe directly, for measuring the infinitely large or small, for surveying unknown continents or even universes that we never knew existed.

Through the description of his researches, Claude Cohen-Tannoudji depicts his daily life as a physicist in a human-sized team.

In this film, Claude Cohen-Tannoudji, a researcher in atomic physics, presents his work on interactions between matter and radiation.

An explanation of atomic physics by Claude Cohen-Tannoudji, professor of atomic and molecular physics at the Collège de France, and Serge Haroche, professor of physics at the Ecole Normale Supérieure.