title: Experimental characterization of two spatial qutrits using entanglement witnesses.
abstract: We present an experimental technique for a complete characterization of entanglement in a two-qutrit state generated using transverse spatial correlations of two parametric down-converted photons. We verify entanglement for a particular case via entanglement witness operators which are decomposed into a sum of local observables of single path and superposition projection operators. Experimentally, these operators are accomplished by using a spatial light modulator and a polarizing beam splitter which allow to modulate the amplitude of individually chosen path states. The quantification of entanglement is computed by the negativity obtained from the expectation values of the entanglement witnesses implemented.
authors.affiliation: Departamento de Física, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil. agutierrez@fisica.ugto.mx
authors.forename: A J
authors.initials: AJ
authors.lastname: Gutiérrez-Esparza
authors.forename: W M
authors.initials: WM
authors.lastname: Pimenta
authors.forename: B
authors.initials: B
authors.lastname: Marques
authors.forename: A A
authors.initials: AA
authors.lastname: Matoso
authors.forename: J L
authors.initials: JL
authors.lastname: Lucio M
authors.forename: S
authors.initials: S
authors.lastname: Pádua
mesh_terms: D003198:Computer Simulation; D006801:Humans; D008027:Light; D008962:Models, Theoretical; D017785:Photons; D012542:Scattering, Radiation