title: Path and phase determination for an interfering photon with orbital angular momentum.
abstract: A polarized photon with well-defined orbital angular momentum that emerges from a Mach-Zehnder interferometer (MZI) is shown to seemingly circumvent wave-particle duality constraints. For certain phase differences between the MZI arms, this pattern yields both reliable which-path information and high phase sensitivity.
authors.affiliation: Department of Optics, Palacký University, 17. listopadu 50, 77200 Olomouc, Czech Republic. kolar@optics.upol.cz
authors.forename: Michal
authors.initials: M
authors.lastname: Kolá
authors.forename: Tomás
authors.initials: T
authors.lastname: Opatrný
authors.forename: Gershon
authors.initials: G
authors.lastname: Kurizki