  Photons occupying multiple spatial modes hold a great promise for
implementing high-dimensional quantum communication. We use spontaneous four
wave mixing to generate multimode photon pairs in a few mode fiber. We show the
photons are correlated in the fiber mode basis using an all-fiber mode sorter.
Our demonstration paves the way to realization of high-dimensional quantum
protocols based on standard, commercially available, fibers in an all-fiber
configuration.
