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Researchers have successfully demonstrated secure quantum key distribution over an 18-kilometer free-space link by using adaptive optics to correct atmospheric turbulence in real time. This field trial notably utilized room-temperature detectors instead of the typically required cryogenic cooling, suggesting a viable path toward more scalable and cost-effective quantum networks. The study also validates a turbulence-based model that provides practical design guidelines for future long-distance quantum communication infrastructure.

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Adaptive optics fix turbulence for secure quantum links over 11 miles

Quantum ZeitgeistAugust 26, 20265 min read

Researchers achieved intermodal quantum key distribution over an 18 km free-space channel, using adaptive optics to correct for atmospheric turbulence.

Researchers at the University of Padova and ThinkQuantum s.r.l. have achieved secure quantum key distribution over an 18 kilometer free-space link. The demonstration overcomes longstanding challenges posed by atmospheric turbulence using an adaptive optics system that corrects for wavefront aberrations, enabling efficient single-mode fiber coupling. This real-time field trial utilized room-temperature detectors, a surprising advancement as most quantum communication relies on extremely cooled technology, and generated keys at a rate of 200 bit/s. The work also validates through experimental data a turbulence-based model for predicting fiber coupling efficiency, providing practical design guidelines for future quantum networks. An 18 kilometer secure quantum key distribution link has been…

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