title: Entangled Bessel-Gaussian beams.
abstract: Orbital angular momentum (OAM) entanglement is investigated in the Bessel-Gaussian (BG) basis. Having a readily adjustable radial scale, BG modes provide an alternative basis for OAM entanglement over Laguerre-Gaussian modes. We show that the OAM bandwidth in terms of BG modes can be increased by selection of particular radial wavevectors and leads to a flattening of the spectrum, which allows for higher dimensionality in the entangled state. We demonstrate entanglement in terms of BG modes by performing a Bell-type experiment and showing a violation of the Clauser-Horne-Shimony-Holt inequality for the ℓ = ±1 subspace. In addition, we use quantum state tomography to indicate higher-dimensional entanglement in terms of BG modes.
authors.affiliation: CSIR National Laser Centre, P.O. Box 395, Pretoria 0001, South Africa.
authors.forename: Melanie
authors.initials: M
authors.lastname: McLaren
authors.forename: Megan
authors.initials: M
authors.lastname: Agnew
authors.forename: Jonathan
authors.initials: J
authors.lastname: Leach
authors.forename: Filippus S
authors.initials: FS
authors.lastname: Roux
authors.forename: Miles J
authors.initials: MJ
authors.lastname: Padgett
authors.forename: Robert W
authors.initials: RW
authors.lastname: Boyd
authors.forename: Andrew
authors.initials: A
authors.lastname: Forbes
mesh_terms: D000465:Algorithms; D003198:Computer Simulation; D008027:Light; D015233:Models, Statistical; D016011:Normal Distribution; D012542:Scattering, Radiation