title: Concentration of higher dimensional entanglement: qutrits of photon orbital angular momentum.
abstract: Enhancement of entanglement is necessary for most quantum communication protocols many of which are defined in Hilbert spaces larger than 2. In this work we present the experimental realization of entanglement concentration of orbital angular momentum entangled photons. We investigate the specific case of three dimensions and the possibility of generating different entangled states out of an initial state. The results presented here are of importance for pure states as well as for mixed states.
authors.affiliation: Institut für Experimentalphysik, Universität Wien, Boltzmanngasse 5, A-1090 Vienna, Austria.
authors.forename: Alipasha
authors.initials: A
authors.lastname: Vaziri
authors.forename: Jian-Wei
authors.initials: JW
authors.lastname: Pan
authors.forename: Thomas
authors.initials: T
authors.lastname: Jennewein
authors.forename: Gregor
authors.initials: G
authors.lastname: Weihs
authors.forename: Anton
authors.initials: A
authors.lastname: Zeilinger