Future proofing network encryption technology with continuous-variable quantum key distribution

• URL: http://arxiv.org/abs/2402.18881v2
• Date: Sat, 14 Sep 2024 16:59:00 GMT
• Title: Future proofing network encryption technology with continuous-variable quantum key distribution
• Authors: Nitin Jain, Hou-Man Chin, Adnan A. E. Hajomer, Dev Null, Henrik Larfort, Naja Lautrup Nysom, Erik Bidstrup, Ulrik L. Andersen, Tobias Gehring,
• Abstract summary: We demonstrate a proof-of-concept establishment of quantum-secure data transfer links in Denmark. Several different links, implemented physically using optical ground wires, underground fibers as well as their combinations, were investigated. We estimate average secret key rates of $434.8, 148.6$, and $78.3$ in the limit for diverse channels with losses (at 1550 nm) of 4.1, 5.5, and 6.7 dB, respectively.
• Score: 0.29022435221103454
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We demonstrate a proof-of-concept establishment of quantum-secure data transfer links in field trials at two locations in Denmark: on the campus of Technical University of Denmark in Lyngby and between power grid nodes owned and operated by Energinet in Odense. Several different links, implemented physically using optical ground wires, underground fibers as well as their combinations, were investigated. Coherent `quantum' states at 1550 nm, prepared and measured using a semi-autonomous continuous-variable quantum key distribution (CVQKD) prototype, were multiplexed in wavelength with `classical' 100Gbps encrypted data traffic from a pair of commercial layer-2 network encryption devices operating at around 1300 nm. Under the assumptions of real-time data processing, we estimate average secret key rates of $434.8, 148.6$, and $78.3$ kbps in the asymptotic limit for diverse channels with losses (at 1550 nm) of 4.1, 5.5, and 6.7 dB, respectively. The demonstrations permit an evaluation of the prototype's tolerance to harsh field conditions and showcase that CVQKD can serve as an additional layer to protect sensitive network traffic propagating on insecure channels.

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