Beijing (Agencies): Chinese researchers have successfully built a 300-kilometer fully connected quantum secure direct communication (QSDC) network, marking a significant advancement in quantum communication technology. The breakthrough, developed by the Beijing Academy of Quantum Information Sciences (BAQIS), offers a highly secure and scalable quantum network, paving the way for practical applications in sectors requiring extreme data security, such as government communication and financial transactions.
The BAQIS team introduced a multipump expandable QSDC network designed to function efficiently in noisy environments, reducing complexity while ensuring long-distance secure communication between multiple users. This innovation addresses key challenges in quantum communication, particularly maintaining reliability over extended distances and scaling user connectivity in real-world scenarios.
The research highlights three major technical breakthroughs:
- Overcoming traditional star-shaped network limitations to enable full scalability.
- Extending transmission distances to 300 kilometers using optimized entangled light source preparation.
- Establishing an error correction mechanism based on quantum state reconstruction, ensuring stable multi-node communication.
The team reported that the fidelity of entangled quantum states shared among users remained above 85 percent, confirming the effectiveness of their approach. This development strengthens quantum security protocols, positioning China at the forefront of next-generation quantum communication networks.
Earlier this year, Chinese scientists achieved stable data transmission of 2.38 kilobits over a 104.8-kilometer fiber-optic network during a 168-hour experimental test, demonstrating a 4,760-fold improvement in quantum secure direct communication performance.
BAQIS researchers believe their newly developed QSDC network could revolutionize secure data transmission, making it a strategic asset in global cybersecurity.