The Review of the Commercial Quantum Key Distribution System

A review of the existing commercial quantum key distribution systems was conducted. The principle of operation of a fiber-optic quantum key distribution system with phase coding of photon states is described. The operation of the system in the mode of forming quantum keys is described. The synchronization process is analyzed, which consists in detecting a time interval with an optical pulse. The basic properties and parameters of auto-compensation quantum key distribution system are reviewed. The images of the current stand of the quantum-cryptographic network are given. The stand includes two stations of the quantum key distribution system with phase coding of photon states, two servers and data transmission channels. It is shown that the formation of a quantum key in the experiment is carried out at a rate of 500 bits per second. The length of the quantum communication channel in the experiment is 24 km. In this case, the quantum channel consists of a conventional single-mode optical fiber. Trends in the development of quantum key distribution systems, as well as trends in the development of protocols for quantum cryptography was conducted.