New advances in quantum communications: generating passwords unaffected by optical fibers

China University of Science and Technology Hefei micro-scale material Science National Laboratory Professor Pan Jianwei and colleagues Yang, Chen Tenyun etc. in the optical fiber communication, a kind of anti-interference quantum cipher assignment scheme is realized, which guarantees the safety and quality of the long-distance fiber quantum communication. The results are published in the recently published International Physics Authoritative journal, "Physical Review Letters." "Very good" "has special value", is the magazine reviewer of this achievement evaluation. Quantum cipher is a secure means of communication which can provide absolute security, and it has already begun to be practical. And now most of the quantum communication is transmitted through the optical fiber, because of the defects of the fiber itself, as well as the external distortion of the optical fiber, rotation, will make information distortion, resulting in a quantum cipher error, greatly reducing the efficiency of the password. The usual solution is to change the photons that transmit the information in reverse direction, and turn the photons back to their original state, but in the complex and changeable environment, it is very difficult to change the opposition. At the same time, to limit the influence of the noise on the password, it is very difficult to measure the photon information in the 1 billion-second-order synchronization time. The Pan Jianwei research team used a special calibration method in the experiment, by encoding the quantum information onto the photon and artificially adding random rotation, the last generated cipher is not affected by the distortion, rotation of the fiber, or the defect of the optical fiber itself, the communication both sides do not need the precise synchronization time, which greatly reduces the complexity of the communication. No matter how the external environment changes, both sides of optical fiber communication will always have the means to obtain the required password. In addition, they give the theory of absolute security of quantum communication scheme, and avoid the security hidden trouble of the existing optical fiber quantum communication. According to the researchers, next, they will carry out further research on the basis of this program to achieve absolute secure quantum communication. (Responsible editor ZHAOHB musicemail#sohu.com TEL: (010) 68476636-8007) give force (0 votes) to the (0 Votes) nonsense (0 Votes) Professional (0 Votes) The title party (0 Votes) passing (0 votes) New advances in quantum communications: generating passwords from fiber-optic effects return to network security home