How big data era cracking optical fiber links the contradiction between limited resources and unlimited amount of information growth? A latest research results provides a possible solution: scientists on the channel capacity for the first time realized the classic communication beyond, in the optical fiber line, about 20 km quantum fingerprint identification is realized.
Jian-wei pan the results by the China university of science and technology, and colleagues, zhang qiang, lilly with Shanghai micro system of Chinese academy of sciences, such as the United States at the Massachusetts institute of technology cooperation with scientific research personnel and relevant papers published recently in the authority of the international physics academic journal physical review letters.
With the rapid development of Internet technology and multimedia applications, especially the advent of the era of big data, optical communication network business is growing rapidly at a speed of exponential. In optical fiber links under the condition of limited resources, how to transfer the least amount of information, improve the fiber channel capacity, is the core issues of optical communication academia and industry are facing at present.
According to introducing, quantum communication complexity research using the superposition principle of quantum mechanics, quantum channel can be used to provide higher channel capacity, is one of the important applications of quantum fingerprint identification. Fingerprint identification is mainly used in remote information of both sides, suppose you want to compare the amount of information for 100 units, the classic fingerprinting method need to transfer the minimum amount of information for 10 units, and through quantum fingerprint identification method, by using the superposition principle of quantum mechanics, only 2 units of information transmission in theory.
Quantum fingerprint identification theory presented by researchers as early as 2001, but is limited by various technical conditions, the previous experiments on international has failed to break the limit of the classic methods. Jian-wei pan and co-author of the study, finally realizes the information transmission of 84% lower than the classical limit of quantum fingerprint identification. The experiment not only for the first time in the world of classical limit of quantum fingerprint identification, was observed in the experiments for the first time the superiority of the quantum channel capacity compared with the classical channel.
The results of the study are recognised by the international academic circles highly. Physical review letters reviewers praised this experiment for "provides a quantum secret key distribution outside the important application of quantum information"; International famous quantum communications expert NorbertLuetkenhaus thinks, "the study will open many other (quantum communication) the application of".
