Characterization and stability measurement of deployed multicore fibers for quantum applications

Abstract

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Field-trial quantum key distribution between Sicily and Malta

“…However, today's QKD cannot guarantee key rates comparable to classical competitors such as post-quantum algorithms, and it works only on limited distances. Efforts towards making these two factors less detrimental is today's priority of every research in this field; twin field QKD 15 and high dimensional protocols [16][17][18][19][20] are just some examples that go in this direction.…”

A Field Trial of Multi-Homodyne Coherent Detection over Multi-Core Fiber for Encryption and Steganography

“…The multi-core fiber network is an optical test-bed infrastructure built in 2019 in the city of L'Aquila [14], [28]. A single jelly-filled loose-tube cable, with an outer diameter of 6 mm and a total length of 6.29 km, has been deployed in a multi-service underground tunnel with both ends accessible from the same location.…”

Roadmap on multimode photonics

“…Fiber-based interferometer are inherently unstable and feedback loops (to lock the different relative phase between the cores) are required to successfully perform an interference measurement. Many phase-locked loops have been studied over the years, but recently an innovative and promising method has been investigated, whose results are reported in [44,45,50]. Another important effect to be considered when using these fibers is the cross-talk between modes or cores.…”

“…Smart feedback loops are therefore essential for MCF-based highdimensional quantum communications. In [44,45,50], a promising and novel scheme is presented, which can be further boosted by integrating the whole scheme on photonic integrated chips and by exploiting fast electrical components so that faster phase oscillations can be compensated. In addition, further devices can be considered while working with MCFs.…”