Translation. Region: Russian Federal
Source: People’s Republic of China in Russian – People’s Republic of China in Russian –
Source: People’s Republic of China – State Council News
BEIJING, June 4 (Xinhua) — Chinese scientists have achieved a new milestone in the development of quantum communication by successfully building a 300-kilometer-long fully connected quantum secure direct communication (QSDC) network, which is practically applicable to long-distance communication use.
A major breakthrough by a research team from Shanghai Jiaotong University has preserved the accuracy of a quantum state by more than 85 percent after transmitting data between four users over a distance of 300 km, Science and Technology Daily reported.
Published in the journal Science Bulletin, the latest research aims to overcome two key limiting factors for quantum networking – data transmission range and throughput.
The team developed an innovative dual-pumped structure with high anti-jamming capability to successfully realize QSDC over a distance of more than 300 km, while the photon pair transmission frequency was stabilized at 300 to 400 Hz, which theoretically allows for data transmission rates of several bits per second.
The result follows a team of researchers from Beijing in February this year reporting a world record in testing quantum direct communication over standard optical fibre, achieving continuous and uninterrupted data transmission over a distance of 104.8 km.
Quantum direct communication was previously proposed by researchers at Tsinghua University. It enables secure communication by using quantum states and has advantages such as detecting and preventing eavesdropping, compatibility with existing networks, simplified management processes, and covert data transmission.
QSDC systems are expected to be widely used in finance and other areas with extremely high information security requirements. -0-