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.
© 2008 Optical Society of America
Original Manuscript: September 26, 2007
Manuscript Accepted: October 26, 2007
Published: December 20, 2007
Michal Kolář, Tomáš Opatrný, and Gershon Kurizki, "Path and phase determination for an interfering photon with orbital angular momentum," Opt. Lett. 33, 67-69 (2008)