Chinese scientists have made new progress in high security quantum key distribution networks

In recent days, , The team of academician Guo guangcan of University of science and technology of China has made important progress in the research of quantum key distribution networking . The scientific research team has realized a quantum key distribution network with non trusted nodes that can resist environmental interference , The security of quantum key distribution network is comprehensively improved 、 Availability and reliability , An important step has been taken towards the realization of the next generation quantum network .

Network security is an important theme in the information age , Quantum key distribution network is based on the principles of quantum physics , It can provide thousands of users with information theory secure confidential communication services , Build a safe and controllable network environment . However, the demand for trusted nodes in the network raises the threshold of their actual deployment , How to exempt the intermediate nodes that must be trusted on the user link , Reduce the security requirements for communication links , So as to build the next generation quantum network based on untrusted nodes , It is an urgent problem to be solved at present .

The measurement device independent quantum key distribution protocol jointly measures the encoded quantum states by setting up an untrusted node , A secure communication link can be built between two users , It is an important role in building a 100 kilometer metropolitan quantum network . However, joint measurement not only limits the number of participating users , It also puts forward higher requirements for the stability of the channel environment , It is not conducive to deployment in complex network environment . The scientific research team has carried out in-depth research on this issue for many years . Through a series of technical breakthroughs , The scientific research team has completed the construction of the measurement device independent quantum key distribution network , At the same time, it can resist environmental interference 、 No trusted nodes required 、 Support multi-user flexible networking . This achievement has promoted the practicality of the next generation quantum secure communication network , It has made a useful exploration for the specific form of quantum Internet in the future .