An underwater communication system based on continuous variable quantum key distribution and method realization method thereof

Abstract

The invention discloses an underwater communication system based on continuous variable quantum key distribution and a realization method thereof, belonging to the technical field of free space quantum communication. The optical signal is outputted to the receiving end through the cooperation of a first laser, a first electro-optic intensity modulator, a signal source, a first beam splitter, a second electro-optic intensity modulator, a first electro-optic phase modulator and a tunable laser attenuator at the transmitting end; The second laser generates local oscillation light, which is modulated by the second electro-optical phase modulator, the local oscillation light and the optical signal outputted from the transmitting end enter the homodyne detector for detection, and finally the security key is established within the effective distance. The invention applies the continuous variable quantum key distribution technology to the underwater optical communication system, the optical signal is not easy to be stolen by a third party, and the safe underwater communication system is realized. Heterodyne detection is used to filter the ambient stray light, which also achieves good detection effect in the daytime and the environment with background light.

Description

technical field [0001] The invention belongs to the technical field of free space quantum communication, and in particular relates to an underwater communication system based on continuous variable quantum key distribution and an implementation method thereof. Background technique [0002] The quantum key distribution system can share keys between legitimate parties through an untrusted quantum channel, and its theoretical absolute security is based on the uncertainty principle of quantum mechanics and the quantum non-cloning theorem. At present, the implementation schemes of quantum key distribution system are mainly divided into discrete variables and continuous variables. Compared with the discrete variable scheme, the continuous variable has its unique advantages, including easy preparation, easy detection, etc., which makes it well researched and promoted in the application field. [0003] Underwater communication systems are an important part of ocean exploration and ...

AI Technical Summary

Problems solved by technology

[0003] Underwater communication systems are an important part of ocean exploration and modern communication systems. Traditional underwater communication uses acoustic wave technology, which has inherent flaws, such as low bandwidth, high latency, and security issues

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