Phase compensation implementation method of continuous variable quantum key distribution system

Abstract

The invention discloses a phase compensation implementation method of a continuous variable quantum key distribution system. A sender performs Gaussian modulation on initial continuous key data by using the coherent state and then sends the modulated signals to a receiver through an optical fiber channel; and the receiver performs preprocessing, error corrosion and confidentiality enhancement on the acquired initial continuous key data by using an algorithm based on orthogonal basis expansion so as to acquire the final security key. According to the method, the practical use of the continuous variable quantum cryptography is prompted, and environmental interference and human attack affected by the quantum signals in the quantum communication process can also be effectively suppressed.

Description

technical field [0001] The invention belongs to the technical field of quantum communication, and relates to a phase compensation realization method of a continuous variable quantum key distribution system based on data post-processing. Background technique [0002] Secure communication has always been one of the research focuses in the field of communication. Both legal communication parties encrypt the information to be transmitted through the key, which can increase the difficulty for the third party to obtain the information. Key distribution and key management play an important role in this process. Quantum key distribution provides a physical principle-based key distribution method for legitimate communication parties, so it has attracted much attention in recent years. [0003] Quantum keys are relative to traditional keys, both of which belong to the category of secure communication. Existing known methods of secure communication, including quantum keys, are only s...

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Problems solved by technology

However, one of the biggest disadvantages of the GMCS method is that when the local oscillator light and signal light are transmitted in the channel, the attacker can use the local oscillator light sent by the sender to intercept and resend the attack, thereby reducing the security of the system

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