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Researchers have demonstrated a stable quantum key distribution system using semiconductor quantum dots that successfully transmitted unhackable encryption keys over 120 kilometers of optical fiber for over six hours. This achievement highlights the viability of time-bin encoding and on-demand photon sources for building robust, long-distance quantum networks resistant to environmental disturbances. The high secure key rates achieved without manual adjustments suggest a practical pathway toward scalable quantum internet infrastructure.

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Scientists just sent unhackable quantum keys across 120 kilometers

ScienceDailyMay 9, 20263 min read

Scientists have taken a major step toward ultra-secure quantum communication by demonstrating a remarkably stable quantum encryption system that worked across more than 120 kilometers of optical fiber. Using tiny semiconductor quantum dots that emit single particles of light on demand, the team achieved one of the highest secure key rates yet for this type of technology while maintaining continuous operation for over six hours without manual adjustments.

Quantum key distribution (QKD) is widely considered the most advanced form of quantum cryptography, offering a path toward virtually unbreakable security for the future quantum internet. One promising technology behind these secure systems involves semiconductor quantum dots (SQDs), tiny solid-state light sources capable of generating high-quality single photons for quantum communication. These devices could help…

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