Continuous variable entanglement using cold atoms

Vincent Josse (1) , Aurelien Dantan (1) , Alberto Bramati (1) , Michel Pinard (1) , Elisabeth Giacobino (1)

1 LKB (Jussieu) - Laboratoire Kastler Brossel

We present experimental demonstration of quadrature andpolarization entanglement generated via the interactionbetween a coherent linearly polarized field and cold atoms in ahigh finesse optical cavity. The non linear atom-field interactionproduces two squeezed modes with orthogonal polarizations whichare used to generate a pair of non separable beams, theentanglement of which is demonstrated by checking the inseparabilitycriterion for continuous variables recently derived by Duanet al. [Phys. Rev. Lett. 84, 2722 (2000)].

Domaines: Physique Quantique [quant-ph]

Vincent Josse, Aurelien Dantan, Alberto Bramati, Michel Pinard, Elisabeth Giacobino. Continuous variable entanglement using cold atoms. 2003. ⟨hal-00000437v2⟩