title: Quantum homodyne tomography of a two-photon Fock state.
abstract: We present a continuous-variable experimental analysis of a two-photon Fock state of free-propagating light. This state is obtained from a pulsed nondegenerate parametric amplifier, which produces two intensity-correlated twin beams. Counting two photons in one beam projects the other beam in the desired two-photon Fock state, which is analyzed by using a pulsed homodyne detection. The Wigner function of the measured state is clearly negative. We developed a detailed analytic model which allows a fast and efficient analysis of the experimental results.
authors.affiliation: Laboratoire Charles Fabry de l'Institut d'Optique, CNRS UMR 8501, 91403 Orsay, France.
authors.forename: Alexei
authors.initials: A
authors.lastname: Ourjoumtsev
authors.forename: Rosa
authors.initials: R
authors.lastname: Tualle-Brouri
authors.forename: Philippe
authors.initials: P
authors.lastname: Grangier