emirates7 - Chinese scientists have successfully built a fully connected quantum secure direct communication (QSDC) network spanning 300 kilometers, marking a significant advancement in quantum technology, according to the Beijing Academy of Quantum Information Sciences (BAQIS).
In a statement to the Global Times, the BAQIS research team announced the development of a scalable, multipump QSDC network that functions effectively in noisy environments. This new structure is designed to reduce overall system complexity, support more users, and maintain reliable communication distances between them.
The network provides a crucial platform for testing core quantum mechanics principles and advancing quantum communication and computing technologies. The achievement brings QSDC systems closer to practical applications, particularly in sectors like government and finance that demand ultra-secure communication channels.
One of the main challenges in developing QSDC systems has been ensuring the security and reliability of quantum-state-based communication over long distances and among multiple users—two areas where previous technologies have struggled to deliver simultaneously.
"Our recent work introduces a scalable, long-distance, fully connected QSDC network that uses a double-pump structure and adds extra noise to enable secure communication between four users across 300 kilometers," the researchers explained.
The adoption of multipump technology helped simplify the system’s design. Despite the increased communication range, the team reported that the fidelity of entangled quantum states remained above 85%, confirming the system’s effectiveness and stability over long distances.
They highlighted three major technical breakthroughs: moving beyond traditional star-shaped network structures to enable scalable full connectivity, extending communication distance to 300 kilometers using improved entangled light sources, and implementing a quantum state reconstruction-based error correction system to ensure consistent, multi-node communication.
In a statement to the Global Times, the BAQIS research team announced the development of a scalable, multipump QSDC network that functions effectively in noisy environments. This new structure is designed to reduce overall system complexity, support more users, and maintain reliable communication distances between them.
The network provides a crucial platform for testing core quantum mechanics principles and advancing quantum communication and computing technologies. The achievement brings QSDC systems closer to practical applications, particularly in sectors like government and finance that demand ultra-secure communication channels.
One of the main challenges in developing QSDC systems has been ensuring the security and reliability of quantum-state-based communication over long distances and among multiple users—two areas where previous technologies have struggled to deliver simultaneously.
"Our recent work introduces a scalable, long-distance, fully connected QSDC network that uses a double-pump structure and adds extra noise to enable secure communication between four users across 300 kilometers," the researchers explained.
The adoption of multipump technology helped simplify the system’s design. Despite the increased communication range, the team reported that the fidelity of entangled quantum states remained above 85%, confirming the system’s effectiveness and stability over long distances.
They highlighted three major technical breakthroughs: moving beyond traditional star-shaped network structures to enable scalable full connectivity, extending communication distance to 300 kilometers using improved entangled light sources, and implementing a quantum state reconstruction-based error correction system to ensure consistent, multi-node communication.