Characterization and stability measurement of deployed multicore fibers for quantum applications

Year: 2021

Authors: Bacco D., Biagi N., Vagniluca I., Hayashi T., Mecozzi A., Antonelli C., Oxenlowe L.K., Zavatta A.

Autors Affiliation: CoE SPOC, DTU Fotonik, Technical University of Denmark, 2800 Kgs., Lyngby, Denmark; Istituto Nazionale di Ottica (CNR-INO), Largo E. Fermi 6, Florence, 50125, Italy; LENS and Department of Physics and Astronomy, University of Florence, Sesto Fiorentino, 50019, Italy; Department of Physics “Ettore Pancini”, University of Naples “Federico II”, Via Cinthia 21, Naples, 80126, Italy; Optical Communications Laboratory, Sumitomo Electric Industries Ltd., Yokohama, 244-8588, Japan; Department of Physical and Chemical Sciences, University of L´Aquila, L´Aquila, 67100, Italy; National Laboratory of Advanced Optical Fibers for Photonics (FIBERS), CNIT, L?Aquila, 67100, Italy

Abstract: Multicore fibers are expected to be a game-changer in the coming decades thanks to their intrinsic properties, allowing a larger transmission bandwidth and a lower footprint in optical communications. In addition, multicore fibers have recently been explored for quantum communication, attesting to their uniqueness in transporting high-dimensional quantum states. However, investigations and experiments reported in literature have been carried out in research laboratories, typically making use of short fiber links in controlled environments. Thus, the possibility of using long-distance multicore fibers for quantum applications is still to be proven. We characterize here for the first time, to the best of our knowledge, in terms of phase stability, multiple strands of a four-core multicore fiber installed underground in the city of L?Aquila, with an overall fiber length up to about 25 km. In this preliminary study, we investigate the possibility of using such an infrastructure to implement quantumenhanced schemes, such as high-dimensional quantum key distribution, quantum-based environmental sensors, and more, in general, quantum communication protocols.

Journal/Review: PHOTONICS RESEARCH

Volume: 9 (10)      Pages from: 1992  to: 1997

More Information: Horizon 2020 Framework Programme OpenQKD (857156), SQUARE (731473); Ministero dell´Istruzione, dell´Universita e della Ricerca (INCIPIT); H2020 Science with and for Society (G5485); Danmarks Grundforskningsfond SPOC (123).
KeyWords: multicore fibers
DOI: 10.1364/PRJ.425890

Citations: 3
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