Satellite wide-area quantum communication network system and communication method

Abstract

The present invention provides a satellite wide-area quantum communication network system and a communication method. The invention aims to solve the technical problem of small network scales and short communication distances in the prior art. The network system includes a plurality of quantum trusted relays, a plurality of ground stations, a plurality of quantum terminals, a plurality of optical fiber quantum key distribution links and a plurality of free space quantum key distribution links, wherein the quantum trusted relays comprise quantum routers, satellites and quantum gateways, the optical fiber quantum key distribution links are used for realizing connections between the quantum gateways and the quantum routers and connections between the ground stations and the quantum routers, and the free space quantum key distribution links are used for realizing connections between the satellites and the ground stations and connections between the satellites. The communication method includes the following steps that: the quantum trusted relays negotiate with each other to obtain keys and store the keys, and the satellites and the ground stations negotiate with each other to obtain keys and store the keys; and the quantum terminals establish connections between each other and transmit information; a current node judges whether the information needs to be encrypted; the current node encrypts the information and transmits the encrypted information; and the quantum terminals release the connections therebetween.

Description

technical field [0001] The invention belongs to the technical field of communication, and relates to a quantum communication network and a communication method, in particular to a satellite-based wide-area quantum communication network system and a communication method, which can be used to construct a quantum communication network covering the whole world. Background technique [0002] Quantum communication is a communication method that uses quantum mechanics system and information theory to achieve unconditional and safe transmission of information. It has the characteristics of unconditional absolute security and high transmission efficiency. Therefore, it has received extensive attention and achieved rapid development. Some companies and research institutions have begun to try to establish quantum communication networks in different ways, including the DARPA quantum communication network of the U.S. Defense Advanced Research Projects Agency, SECOQC, a secure communicati...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the above-mentioned defects in the prior art, and propose a satellite-based wide-area quantum communication network system and communication method, which is used to solve the problems of small network scale and communication method existing in the existing quantum communication network system and communication method. Technical issues with short communication distances

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