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MDI-QKD network communication system and communication method

A technology of network communication and communication unit, applied in the field of optical communication, can solve the problem that the user terminal cannot communicate, and achieve the effect of improving the communication rate

Active Publication Date: 2019-12-27
QUANTUMCTEK
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, the user terminal for quantum communication is selected through the optical switch, and only two user terminals are allowed to perform quantum communication at the same time. When two user terminals communicate, other user terminals cannot communicate.

Method used

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Embodiment Construction

[0048] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0049] refer to figure 1 , figure 1 It is a schematic structural diagram of an existing MDI-QKD network communication system, figure 1 The MDI-QKD network communication system shown has N user terminals 11, which are the first user terminal to the Nth user terminal in sequence, and the user terminals 11 are all connected to the relay node. The relay node includes an optical switch 12, through which the signals of two user terminals 11 are selected to be conn...

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Abstract

The invention discloses an MDI-QKD network communication system and a communication method. Each communication unit is set to correspond to an optical fiber mode; wherein the optical fiber modes corresponding to all the communication units are not completely the same, and the optical fiber modes of at least two communication units are different. And when the two user terminals of the same communication unit communicate with each other, the two user terminals send the quantum signals of the optical fiber mode corresponding to the communication unit to the central node device. At the same time,the communication units with different optical fiber modes can communicate simultaneously based on different optical fiber modes; in the communication units with the same optical fiber mode, only onecommunication unit can carry out communication at the same moment. Therefore, the optical fiber modes of the at least two communication units are different, when the two user terminals in one communication unit communicate, the two user terminals in at least one other communication unit can communicate at the same time, and the communication rate and the access number of the user terminals in thenetwork can be greatly improved.

Description

technical field [0001] The present invention relates to the technical field of optical communication, and more specifically, relates to an MDI-QKD (measurement device-independent quantum key distribution) network communication system and a communication method. Background technique [0002] Quantum Key Distribution (QKD for short) technology can generate an unconditionally secure key between two communicating parties, so it has attracted widespread attention. There are many communication protocols for quantum communication, such as BB84 protocol, COW protocol, etc. The protocol specifies the process of quantum communication. [0003] The most basic and important protocol in quantum communication is the BB84 protocol. The basic process is: the sender emits quantum signal pulses, and randomly modulates the pulses into four different polarization states: 0°, 90°, 45°, and -45°. The receiver randomly selects the measurement base vector (rectangular base vector or diagonal base...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/08H04B10/70
CPCH04L9/0852H04B10/70
Inventor 李东东汤艳琳刘建宏
Owner QUANTUMCTEK
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