China Telecom Quantum Group has launched a commercial-grade distributed cryptography system integrating quantum key distribution (QKD) with post-quantum cryptography (PQC). Designed to provide resilience against both current and future threats posed by quantum computing, the hybrid system secures communications using a dual-layer approach: QKD enables key transmission via quantum-mechanical principles, while PQC leverages hard mathematical problems to ensure resistance to quantum algorithmic attacks. According to the company, this combination delivers an end-to-end quantum-secure architecture applicable to encrypted messaging, secure authentication, and real-time data protection.
The system was demonstrated through a 1,000-kilometer quantum-encrypted voice call between Beijing and Hefei — reportedly the first of its kind over such a distance. This call was supported by China Telecom’s metropolitan quantum networks, already active in 16 urban centers. The networks use QKD over fiber and have been developed to serve both governmental and industrial clients. Hefei’s network in particular is now recognized as the world’s most extensive metropolitan quantum communication infrastructure, comprising 1,147 kilometers of QKD fiber, eight core nodes, and 159 access points. The network supports 500 government agencies and 380 state-owned enterprises.
Alongside the infrastructure rollout, China Telecom introduced two quantum-secure platforms: Quantum Secret, an encrypted collaboration and messaging system, and Quantum Cloud Seal, a secure digital workflow platform for approvals and audits. Both are already deployed in commercial and government settings. The cryptographic system itself is structured as a three-tier architecture, though specific design details remain undisclosed. Analysts note the initiative signals China’s strategic commitment to leading in quantum-secure communications ahead of the anticipated vulnerabilities posed by scalable quantum computers.
Read more in the South China Morning Post coverage here.
May 20, 2025
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