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This research establishes a new benchmark for high-dimensional quantum key distribution over deployed multicore fibers with significant channel loss (10dB). By utilizing full core-mode encoding, the team achieves viable key rates without the efficiency penalties associated with hybrid methods, marking a critical step toward integrating quantum cryptography into existing telecommunications infrastructure. The demonstration of stable spatial qudit transmission in a real-world environment underscores the growing maturity of metropolitan quantum networks.
Quantum keys flow at 6.19e-3 bits per pulse, a first for high-loss links
High-Dimensional Quantum Key Distribution via full Core-mode Encoding over Deployed Multicore Fibers demonstrates quantum keys flowing at 6.19e-3 bits per pulse, a first for high-loss links. Researchers from the Departamento de Física, Universidad de Concepción and affiliated institutions achieved this result using deployed multicore fibers.
Researchers at Universidad de Concepción have achieved a quantum key distribution rate of 6.19 x 10–3 bits per pulse, a new record for high-dimensional QKD operating over links with 10dB of channel loss. The team demonstrated this performance by directly using the full set of core modes within a four-core multicore fiber installed across the university campus. This approach to encoding information offers a viable architecture for realistic, high-rate quantum-secure communications, moving beyond previous hybrid methods that limited efficiency. The work establishes core-mode encoding as a promising path for integrating quantum cryptography into existing telecommunications infrastructure. A composable finite-key rate of 6. The Universidad de Concepción team’s implementation operates over an installed fiber network on its campus, maintaining performance under continuous environmental disturbances. This advance moves beyond hybrid qudit encoding strategies that combine core modes with time-bin photonic degrees of freedom,…
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