First Demonstration of 25λ x 10 Gb/s C+L Band Classical / DV-QKD Co-Existence Over Single Bidirectional Fiber Link
arxiv(2024)
摘要
As quantum key distribution has reached the maturity level for practical
deployment, questions about the co-integration with existing classical
communication systems are of utmost importance. To this end we demonstrate how
the co-propagation of classical and quantum signals can benefit from the
development of novel hollow-core fibers. We demonstrate a secure key rate of
330 bit/s for a quantum channel at 1538 nm in the presence of 25 x 10 Gb/s
classical channels, transmitted at an aggregated launch power of 12 dBm,
spanning over the C+L-band in the same hollow-core fiber link. Furthermore, we
show the co-integration of the classical key-distillation channel onto this
fiber link, turning it into a bidirectional fiber link and thereby mitigating
the need for multiple fibers. We believe this to be an important step towards
the deployment and integration of hollow-core fibers together with DV-QKD for
the inherently secure telecom network of the future.
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