title: Angular two-photon interference and angular two-qubit states.
abstract: Using angular-position-orbital-angular-momentum entangled photons, we study angular two-photon interference in a scheme in which entangled photons are made to pass through apertures in the form of double angular slits, and using this scheme, we demonstrate an entangled two-qubit state that is based on the angular-position correlations of entangled photons. The entanglement of the two-qubit state is quantified in terms of concurrence. These results provide an additional means for preparing entangled quantum states for use in quantum information protocols.
authors.affiliation: Institute of Optics, University of Rochester, Rochester, New York 14627, USA.
authors.forename: Anand Kumar
authors.initials: AK
authors.lastname: Jha
authors.forename: Jonathan
authors.initials: J
authors.lastname: Leach
authors.forename: Barry
authors.initials: B
authors.lastname: Jack
authors.forename: Sonja
authors.initials: S
authors.lastname: Franke-Arnold
authors.forename: Stephen M
authors.initials: SM
authors.lastname: Barnett
authors.forename: Robert W
authors.initials: RW
authors.lastname: Boyd
authors.forename: Miles J
authors.initials: MJ
authors.lastname: Padgett