As quantum computing technology rapidly evolves, traditional encryption methods face increasing vulnerability from powerful new algorithms. In response, a state-owned enterprise in China has unveiled what it claims is the world’s first commercial cryptography system designed to resist even attacks from quantum computers.

China Telecom Quantum Group recently announced the debut of a self-described distributed cryptography system that integrates two core technologies. The company also reported completing the world’s first cross-regional quantum-encrypted phone call using the new system, connecting Beijing and Hefei over a distance of more than 600 miles.

Figure 1.Encryption Technology.

Three-Layer Security Framework

According to a report from the South China Morning Post, the system merges Quantum Key Distribution (QKD), which transmits encryption keys using principles of quantum mechanics, with Post-Quantum Cryptography (PQC), which secures data through complex mathematical algorithms. Together, these technologies form a comprehensive, end-to-end quantum-secure framework aimed at critical applications such as real-time communication, data security, and identity verification.

Peng Chengzhi, chief quantum scientist at China Telecom and professor at the University of Science and Technology of China, warned that as quantum computing capabilities grow, conventional public-key encryption systems will become increasingly susceptible to breaches. He stressed the importance of accelerating the development of quantum-resistant cybersecurity infrastructure to counter emerging threats. Figure 1 shows Encryption Technology.

The company detailed that its system operates on a robust three-layer architecture. Having been tested under real-world conditions, the technology is now poised for large-scale commercial deployment—a major step toward achieving practical quantum-secure communication.

Quantum Networks Across China

China Telecom has also built quantum communication networks in 16 major cities, including Beijing, Shanghai, Hefei, and Guangzhou. These quantum metropolitan area networks serve as the backbone for secure, cross-regional communication, positioning China as a global leader in the field.

Among these, the Hefei Quantum Network is currently the largest and most advanced of its kind. Featuring eight core nodes and 159 access points over 713 miles of quantum key distribution fiber, it supports secure communications for approximately 500 government departments and 380 state-owned enterprises. Leveraging the principles of quantum mechanics, the network aims to provide encryption that is virtually unbreakable.

Reference:

1. https://interestingengineering.com/innovation/china-world-first-unhackable-quantum-cryptography-system

Cite this article:

Keerthana S (2025), China Unveils the World’s First Quantum Cryptography System, Claiming It to Be ‘Unhackable’, AnaTechMaz, pp,243