Entanglement and squeezing in a two-mode system: theory and experiment
Résumé
We report on the generation of non separable beams produced viathe interaction of a linearly polarized beam with a cloud of coldcesium atoms placed in an optical cavity. We convert the squeezingof the two linear polarization modes into quadratureentanglement and show how to find out the best entanglementgenerated in a two-mode system using the inseparability criterionfor continuous variable [Duan et al., Phys. Rev. Lett.84, 2722 (2000)]. We verify this method experimentallywith a direct measurement of the inseparability using two homodynedetections. We then map this entanglement into a polarizationbasis and achieve polarization entanglement.