Continuous variable quantum secret key distribution system based on k-nearest neighbor processing and implementation method

Abstract

The invention discloses a continuous variable quantum secret key distribution system based on k-nearest neighbor processing and an implementation method, wherein the implementation method comprises the following steps: a quantum secret key sending end performs discrete modulation on quantum signals and sends the quantum signals to a quantum secret key receiving end; the quantum secret key receiving end detects the received signals and sends a detection result to a post processing module based on k-nearest neighbor; and the post processing module based on k-nearest neighbor uses a k-nearest neighbor method to process the received signals. According to the continuous variable quantum secret key distribution system based on k-nearest neighbor processing and the implementation method, variousnoises in the quantum secret key distribution system can be overcome, especially the non-gaussian symmetric noise; and the actual safety of the discrete modulation continuous variable quantum secret key distribution system is further improved.

Description

technical field [0001] The invention belongs to the technical field of optical fiber quantum communication, and relates to a discrete modulation continuous variable quantum key distribution system and an implementation method based on k-nearest neighbor processing. Background technique [0002] Quantum key distribution enables two long-distance untrusted quantum channels to safely share keys, and its security is guaranteed by the uncertainty principle of quantum mechanics and the quantum non-cloning theorem. At present, quantum key distribution is divided into two types: discrete variable and continuous variable. Compared with discrete variable quantum key distribution, the quantum state of continuous variable quantum key distribution is easier to prepare, can be integrated into existing optical fiber systems, and can use efficient and low-cost homodyne detection or heterodyne detection technology, which makes Continuous variable quantum key distribution systems are more li...

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Problems solved by technology

[0004] In order to achieve the above object, the present invention provides a continuous variable quantum key distribution system and its implementation method based on k-nearest neighbor processing, which solves the problems of various noises in the quantum key distribution system in the prior art, and the noise will reduce the system's performance. performance problem

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