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arXiv · 2109.08035

Talbot self-imaging and two-photon interference in ring-core fibers

Matias Eriksson·Benjamin A. Stickler·Lea Kopf·Markus Hiekkamäki·Regina Gumenyuk·Yuri Chamorovskiy·Sven Ramelow·Robert Fickler
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Abstract

Wave propagation on the surface of cylinders exhibits interferometric self imaging, much like the Talbot effect in the near-field diffraction at periodic gratings. We report the experimental observation of the cylindrical Talbot carpet in weakly-guiding ring-core fibers for classical light fields. We further show that the ring-core fiber acts as a high-order optical beamsplitter for single photons, whose output can be controlled by the relative phase between the input light fields. By also demonstrating high-quality two-photon interference between indistinguishable photons sent into the ring-core fiber, our findings open the door to applications in optical telecommunications as a compact beam multiplexer as well as in quantum information processing tasks as a scalable realization of a linear optical network.

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Matias Eriksson, Benjamin A. Stickler, Lea Kopf, Markus Hiekkamäki, Regina Gumenyuk, Yuri Chamorovskiy, Sven Ramelow, Robert Fickler. 2021-09-16. Talbot self-imaging and two-photon interference in ring-core fibers. https://doi.org/10.1103/physreva.104.063512

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