title: Measuring the orbital angular momentum of a single photon.
abstract: We propose an interferometric method for measuring the orbital angular momentum of single photons. We demonstrate its viability by sorting four different orbital angular momentum states, and are thus able to encode two bits of information on a single photon. This new approach has implications for entanglement experiments, quantum cryptography and 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: Miles J
authors.initials: MJ
authors.lastname: Padgett
authors.forename: Stephen M
authors.initials: SM
authors.lastname: Barnett
authors.forename: Sonja
authors.initials: S
authors.lastname: Franke-Arnold
authors.forename: Johannes
authors.initials: J
authors.lastname: Courtial