title: Experimental demonstration of continuous variable purification of squeezed States.
abstract: We report on the first experimental demonstration of purification of nonclassical continuous variable states. The protocol uses two copies of phase-diffused states overlapped on a beam splitter and provides Gaussified, less mixed states with the degree of squeezing improved. The protocol uses only linear optical devices such as beam splitters and homodyne detection, thereby proving these optical elements can be used for successful purification of this type of state decoherence which occurs in optical transmission channels.
authors.affiliation: Institut für Gravitationsphysik, Leibniz Universität Hannover and Max-Planck-Institut für Gravitationsphysik Albert-Einstein-Institut, Callinstrasse 38, 30167 Hannover, Germany.
authors.forename: Alexander
authors.initials: A
authors.lastname: Franzen
authors.forename: Boris
authors.initials: B
authors.lastname: Hage
authors.forename: James
authors.initials: J
authors.lastname: Diguglielmo
authors.forename: Jaromír
authors.initials: J
authors.lastname: Fiurásek
authors.forename: Roman
authors.initials: R
authors.lastname: Schnabel