Related papers: Engineering entangled photons for transmission in ring-core optical fibers

Engineering entangled photons for transmission in ring-core optical fibers

URL: http://arxiv.org/abs/2109.03064v1
Date: Tue, 7 Sep 2021 12:55:33 GMT
Title: Engineering entangled photons for transmission in ring-core optical fibers
Authors: G. Ca\~nas, E. S. G\'omez, E. Baradit, G. Lima, and S. P. Walborn
Abstract summary: We study the generation of entangled photons tailor-made for coupling into ring core optical fibers. We show that the coupling of photon pairs produced by parametric down-conversion can be increased by close to a factor of three.
Score: 0.0
License: http://creativecommons.org/licenses/by/4.0/
Abstract: The capacity of optical communication channels can be increased by space division multiplexing in structured optical fibers. Radial core optical fibers allows for the propagation of twisted light--eigenmodes of orbital angular momentum, which have attracted considerable attention for high-dimensional quantum information. Here we study the generation of entangled photons that are tailor-made for coupling into ring core optical fibers. We show that the coupling of photon pairs produced by parametric down-conversion can be increased by close to a factor of three by pumping the non-linear crystal with a perfect vortex mode with orbital angular momentum $\ell$, rather than a gaussian mode. Moreover, the two-photon orbital angular momentum spectrum has a nearly constant shape. This provides an interesting scenario for quantum state engineering, as pumping the crystal with a superposition of perfect vortex modes can be used in conjunction with the mode filtering properties of the ring core fiber to produce simple and interesting quantum states.

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