title: Interferometric methods to measure orbital and spin, or the total angular momentum of a single photon.
abstract: We propose interferometric methods capable of measuring either the total angular momentum, or simultaneously measuring the spin and orbital angular momentum of single photons. This development enables the measurement of any angular momentum eigenstate of a single photon. The work allows the investigation of single-photon two-qubit entangled states and has implications for high density information transfer.
authors.affiliation: Department of Physics and Astronomy, University of Glasgow, Glasgow, Scotland.
authors.forename: Jonathan
authors.initials: J
authors.lastname: Leach
authors.forename: Johannes
authors.initials: J
authors.lastname: Courtial
authors.forename: Kenneth
authors.initials: K
authors.lastname: Skeldon
authors.forename: Stephen M
authors.initials: SM
authors.lastname: Barnett
authors.forename: Sonja
authors.initials: S
authors.lastname: Franke-Arnold
authors.forename: Miles J
authors.initials: MJ
authors.lastname: Padgett