title: Continuous variable entanglement using cold atoms.
abstract: We present an experimental demonstration of both quadrature and polarization entanglement generated via the interaction between a coherent linearly polarized field and cold atoms in a high finesse optical cavity. The nonlinear atom-field interaction produces two squeezed modes with orthogonal polarizations which are used to generate a pair of nonseparable beams, the entanglement of which is demonstrated by checking the inseparability criterion for continuous variables recently derived by Duan et al. [Phys. Rev. Lett. 84, 2722 (2000)]] and calculating the entanglement of formation [Phys. Rev. Lett. 91, 107901 (2003)]].
authors.affiliation: Laboratoire Kastler Brossel, Université Pierre et Marie Curie, Case 74, 4 place Jussieu, 75252 Paris CEDEX 05, France.
authors.forename: V
authors.initials: V
authors.lastname: Josse
authors.forename: A
authors.initials: A
authors.lastname: Dantan
authors.forename: A
authors.initials: A
authors.lastname: Bramati
authors.forename: M
authors.initials: M
authors.lastname: Pinard
authors.forename: E
authors.initials: E
authors.lastname: Giacobino