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A Satellite-Based Space-Ground Integrated Quantum Communication System

A quantum communication, sky-earth technology, applied in photonic quantum communication, transmission system, digital transmission system and other directions, can solve the problems of complex operation, high security requirements of relay nodes, insecure relay links, etc., and achieve breakthroughs Influence, reduce reliability requirements, reduce the effect of information transmission and reception

Active Publication Date: 2022-03-18
RUBAN QUANTUM TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in the above-mentioned patents, the information that needs to be relayed needs to pass through each relay node hop by hop, which requires high security for the relay nodes. As long as the key of a relay node is cracked, the entire relay node link is not secure
[0004] On the other hand, in the above-mentioned patents, the satellite, as a relay, needs to participate in the negotiation of the quantum key, and also needs to relay data, and the operation is more complicated

Method used

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  • A Satellite-Based Space-Ground Integrated Quantum Communication System
  • A Satellite-Based Space-Ground Integrated Quantum Communication System

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] figure 1 The satellite-based space-ground integrated quantum communication system in this embodiment is shown, including: geostationary orbit satellites (G1, G2), medium and low orbit satellites (L1, L2, L3, L4), suspended platform D, fixed Ground station C, ground receivers (J1, J2, J3, J4), and quantum terminals. The fixed ground station C is a fixed land-based platform. The fixed ground station C is connected to the quantum network on the ground through optical fibers. The land-based platform is also connected to the classical network, so that the fixed ground station C can communicate with other quantum network nodes or quantum networks on the ground. The terminal performs quantum key negotiation; the fixed ground station C also accesses the inter-satellite quantum network formed by low- and medium-orbit satellites through the suspended platform D, so that it can perform quantum key negotiation with low- and medium-orbit satellites.

[0045] Geosynchronous orbit sa...

Embodiment 2

[0052] This embodiment is proposed based on the modification of the system part of Embodiment 1. In this embodiment, the ground station is mobile. At this time, the mobile ground station will no longer be connected to the suspended platform through a tethered optical fiber, but will directly communicate with the low-to-medium orbit satellite with the best communication conditions in the sky. Quantum key agreement under . The mobile ground station can also be a land platform or a sea platform. figure 2 It shows the structure of the whole system when the mobile offshore platform is used as the ground station.

[0053] The offshore platform may be an offshore drilling platform, an offshore vessel, a warship, a submarine, and the like.

[0054] figure 2 Among them, A is an ordinary land-based quantum terminal node, and B is an offshore platform, then the communication process between A and B is as follows:

[0055] Node A and ground station C establish a quantum link, ground...

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Abstract

The present invention proposes a satellite-based space-ground integrated quantum communication system, including: quantum terminals, ground relays, ground stations, low-orbit satellites, and high-orbit satellites; inter-satellite quantum links are formed between low-orbit satellites and low-orbit satellites The high-orbit satellite is used to collect the topology of the inter-satellite quantum link within the communication range, and negotiate with other high-orbit satellites to formulate the routing information of the inter-satellite quantum link, and issue the negotiated inter-satellite quantum link routing information For low-orbit satellites and ground stations; the quantum terminal is directly connected to the ground station, or connected through a ground relay; the ground station is connected to the ground station through a quantum channel, and the quantum terminal is connected to the quantum terminal through a quantum channel. A satellite-to-earth quantum link is formed between the station and the low-orbit satellite; the invention also designs a special communication method, which can reduce the security requirements for relay nodes in the entire link. In addition, the satellite only participates in key negotiation and does not perform encryption. Deciphering the calculations simplifies the operation of the satellite.

Description

technical field [0001] The invention relates to the field of quantum secure communication, in particular to a satellite-based space-ground integrated quantum communication system. Background technique [0002] Due to the constraints of geographical environment and other factors, land-based communication systems are not well suited for some extreme environments, and land-based wired communication systems are easily damaged. For quantum communication systems, the current quantum communication is limited by the quantum state transmission distance Due to the limitations of the Internet, only trusted relays can be used to realize long-distance quantum communication. In order to overcome the problem of the limited distance of quantum communication, some people propose to use satellites as relays for wide-area quantum communication. For example, patent CN107437995A discloses a satellite-based wide-area quantum communication network system and communication method. , Quantum router...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/70H04B7/185H04L9/08
CPCH04B10/70H04B7/1851H04L9/0852H04L9/0855H04L9/0838
Inventor 富尧钟一民王泽军
Owner RUBAN QUANTUM TECH CO LTD
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