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flag Chinese scientists built a scalable quantum repeater, extending secure quantum entanglement 11 km and enabling key distribution over 100 km—far beyond previous limits.

flag Chinese scientists at the University of Science and Technology of China have achieved a major breakthrough in quantum networking by demonstrating the first scalable quantum repeater building block, enabling long-distance quantum entanglement over fiber. flag Using a trapped-ion quantum memory and high-fidelity protocols, they extended entanglement distribution to 11 kilometers with device-independent quantum key distribution—3,000 times farther than before—and confirmed secure key generation over 100 kilometers, surpassing previous records by more than two orders of magnitude. flag These advances mark a critical step toward practical, secure quantum communication networks.

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