Polarization compensation implementation method of continuous variable quantum key distribution system

Abstract

The invention discloses a polarization compensation implementation method of a continuous variable quantum key distribution system. The polarization compensation implementation method comprises the following detailed steps that: a transmitting end transmits signal light and local oscillator light through one optical fiber by adopting a polarization multiplexing manner, and a receiving end separates the signal light and the local oscillator light by a polarization beam splitter, wherein a polarization feedback control method is divided into two stages, to be specific, in the light splitting detection stage, the receiving end for distribution of continuous variable quantum keys separate a part of local oscillator light out and covers the local oscillator light into a DC feedback voltage signal through a conversion circuit; and in the polarization correction stage, the receiving end controls a dynamic polarization controller by a feedback algorithm according to the DC feedback voltage to finish polarization correction. The brand-new polarization feedback control implementation method of the continuous variable quantum key distribution system, provided by the invention, has the advantages of effectively preventing the polarization state of continuous variable quantum signals from being subjected to environment interference in the optical fiber communication process, improving the system stability and promoting the practicability of the continuous variable quantum keys.

Description

technical field [0001] The invention relates to a technology in the field of quantum cryptography communication, in particular to a polarization compensation implementation method of a continuous variable quantum key distribution system. Background technique [0002] With the development of the economy and the advancement of science, the process of informatization and digitization is accelerating, and information transmission and exchange are becoming more and more frequent. Therefore, there are higher and higher requirements for the safety and reliability of the information transmission process. How to transmit information securely has become an important issue in the field of modern communication. Applied cryptography emerged as the times require, especially the widespread use in World War II, which further reflects the importance of cryptography. So far, cryptography has played an important role in all aspects of social life such as politics, military affairs, economy, a...

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Problems solved by technology

[0009] 2. The mechanical vibration of the system, mechanical vibration will generate stress in the optical fiber, resulting in a change in the refractive index, causing the pola

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