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Claude Cohen Tannoudji

Prix Nobel en 1997 pour le ralentissement et le piégeage des atomes par la lumière laser.

Ses travaux sont à la source des recherches actuelles de l'IFRAF.



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Accueil du site > Equipes de recherche > Équipes IFRAF > Laboratoire Charles Fabry > Quantum atom optics

Quantum atom optics

Team leaders : Denis Boiron et Chris Westbrook

  • Bose-Einstein condensate
  • Studies of collisions
  • Detection of correlated atoms

The team studies atomic cloud exhibiting quantum correlations. These correlations are measured on metastable helium samples thanks to a single atom, spatial and time-resolved detector. These correlations are due to the quantum statistics of the particles (eg Hanbury Brown and Twiss effect) and/or interactions between particles. The resulting non classical atomic sources will be used in future experiments on quantum information

Hanbury Brown and Twiss effect.

Two-body correlation function of a thermal gas of He4 (boson, top curve) and He3 (fermion, bottom curve) as a function of the relative distance between the two atoms. We observe bunching for bosons and anti-bunching for fermions as predicted by their respective quantum statistics.

Sub-poissonian distribution in a spontaneous four-wave mixing experiment. The collision between two condensates produces a scattering halo of pairs of atoms with opposite velocities (a). The population difference between two symmetric zones (b, red dots in right figure) has a sub-Poissonian noise whereas for two non symmetric zones (blue dots in right figure) it is Poissonian.

Team leadres : Denis Boiron and Chris Westbrook

Other members

  • Josselin Ruaudel (doc)
  • Raphael Lopes (doc)
  • Marie Bonneau (Postdoc)
  • Alain Aspect (DR)

from left to right : J. Ruaudel, C. I. Westbrook, D. Boiron, M. Bonneau, R. Lopes

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