Phys.org September 23, 2021
Researchers in China have created a quantum direct secure communication (QSDC) network based on time–energy entanglement and sum-frequency generation with15 users. They found that fidelity of the entangled state shared by any two users is >97%, when any two users are performing QSDC over 40 km of optical fiber, the fidelity of the entangled state shared by them is still >95%, and the rate of information transmission could be maintained above 1 Kbp/s. The work demonstrates the feasibility of a proposed QSDC network for satellite-based long-distance and global QSDC in the future…read more. Open Access TECHNICAL ARTICLEÂ
Composition of a quantum network. Credit: Light: Science & Applications volume 10, Article number: 183 (2021)