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Researchers have demonstrated a hybrid continuous-variable quantum key distribution system that seamlessly combines 620 meters of free-space links with 2 kilometers of optical fiber. By shifting complex channel adaptations into post-processing software, the team achieved a secret-key rate of 0.93 Mbit/sec over a total distance exceeding 2.6 kilometers, effectively bridging disparate transmission media for the first time. This advancement significantly simplifies future quantum network deployment by reducing reliance on hardware modifications while maintaining high security standards across concatenated environments.

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Researchers Achieve 0.93 Mbit/sec Key Rate Via Squeezed-State QKD

Quantum ZeitgeistAugust 22, 20264 min read

Achieving secure communication across disparate channels previously demanded complex optical adjustments; now, key rates of up to 0. 93 Mbit/s are possible using existing infrastructure. This advance transfers channel adaptation into post-processing, recovering an additional 19% key alone, and unlocks operation between 2km of optical fibre and 620m of open air.

Researchers at University of Denmark alongside collaborators in Italy, Austria and Czech Republic have achieved continuous-variable quantum key distribution (CV-QKD) using both coherent and squeezed states over a deployed hybrid channel consisting of 620 metres of free-space link combined with two kilometres of optical fibre. The team transmitted secure information utilising continuous-variable quantum key distribution through both optical fibres and open air simultaneously; CV-QKD typically focuses on employing either one medium or the other. The demonstration combined 620…

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