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Chinese scientists have independently developed a quantum communication technology that enables secure direct transmission over a distance of 500 meters.
Chinese scientists' pioneering quantum secure direct communication (QSDC) has taken another significant step toward practical application.
On November 14, a joint experimental team from Tsinghua University and Nanjing University of Posts and Telecommunications announced that, following their verification of the QSDC theoretical scheme via quantum storage in the laboratory this past June, they have recently achieved the first direct and secure transmission of quantum information over a 500-meter optical fiber using a quantum phenomenon known as entanglement. Furthermore, theoretical analysis demonstrates that, under current experimental conditions, QSDC over distances of several tens of kilometers is entirely feasible.
Quantum Communication is a novel communication method that utilizes the quantum entanglement effect for information transfer. Emerging over the past two decades, it is a new interdisciplinary field that combines quantum theory with information theory.
Quantum communication primarily encompasses quantum cryptography, quantum teleportation, and quantum dense coding. This discipline has been gradually transitioning from theoretical research to experimental validation and is now advancing toward practical application. As the demand for highly efficient and secure information transmission continues to grow, quantum communication, characterized by its high efficiency and absolute security based on the fundamental principles of quantum mechanics, has become a prominent research hotspot in international quantum physics and information science.
Current experiments indicate that optical-fiber-based QSDC can achieve transmission rates comparable to those of commercially available quantum key distribution (QKD). Although further improvements are still needed for the full commercialization of QSDC, this experiment represents a crucial milestone in its journey toward practical application.
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