Centrosymmetric QKD ring-type multi-user system and key distribution method thereof

A multi-user system, centrosymmetric technology, applied in key distribution, can solve the problems of increased uncertainty of photon signals, low utilization rate of optical pulses, low utilization rate of photons, etc., to save network costs, easy to implement, and mature technology Effect

Active Publication Date: 2022-05-13
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The photon utilization rate of the passive star network is low, and as the number of users increases, the uncertainty of each user receiving the photon signal will also increase
Other multi-user QKD schemes have improved, but one optical pulse can only be used by one user at a time. In fact, it is still a one-to-one multi-user QKD scheme, and there is...

Method used

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  • Centrosymmetric QKD ring-type multi-user system and key distribution method thereof
  • Centrosymmetric QKD ring-type multi-user system and key distribution method thereof
  • Centrosymmetric QKD ring-type multi-user system and key distribution method thereof

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Embodiment 1

[0055] like figure 1 As shown, a centrosymmetric QKD ring type multi-user system includes Alice multi-client 1, Bob multi-client 2 and optical fiber link; said optical fiber link includes Alice multi-client based optical fiber link 104 of Sagnac ring , Bob's multi-client is based on the optical fiber link 204 of the Sagnac ring and the public optical fiber link 3; the Alice multi-client 1 is connected to the Bob multi-client 2 through the public optical fiber link 3;

[0056] Alice multi-user terminal 1 includes n (n≥2 and n is an integer) Alice users, optical path gating device A100, Alice terminal coupling unit and Alice multi-user terminal phase modulator A103;

[0057] like figure 2 and Image 6 As shown, each Alice user includes Alice intensity modulator, Alice polarization controller, first wavelength division multiplexing / demultiplexing device, adjustable optical delay line, Alice phase modulator, second wavelength division multiplexing Use / demultiplexing device and...

Embodiment 2

[0096] like Figure 7 As shown, a kind of two-way quantum key distribution method based on Sagnac ring multi-user system provided by the present invention, the method is applied in a kind of centrosymmetric QKD ring type multi-user system as described above, the method comprises the following steps :

[0097] S1. Establish the identities of both communication parties: confirm through the public channel that one of Alice’s multi-client or Bob’s multi-client is the control end, and the other end is the multi-user receiving end; and after confirming the multi-user control end, confirm the control end according to the communication needs If a certain user is a control user, the control user can simultaneously perform quantum key distribution with multiple users at another multi-user receiving end;

[0098] S2, generate multi-wavelength optical pulses: confirm the control user of the multi-user control terminal and the multi-user receiving end through the public channel again, if ...

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Abstract

According to the centrosymmetric QKD ring type multi-user system and the key distribution method thereof, the system is realized based on a Sagnac ring, the network structure is relatively simple, and the technology is relatively mature; meanwhile, each user stabilizes the light polarization state through the polarization controller, so that the system has better stability; the number of network users can be expanded by the two multi-user terminals according to actual conditions, and quantum key distribution between the users and a plurality of receiving users of the receiving terminal can be controlled through a wavelength division multiplexing/demultiplexing device. Each multi-user side shares one multi-wavelength laser generating device, and shares one group of detectors through the arrangement of the adjustable light delay line, so that the network structure is simplified, and the network cost is saved; the multi-wavelength laser generating device selectively generates multi-wavelength light pulses with certain wavelength intervals, signal crosstalk caused by the four-wave mixing effect can be reduced, and the bit error rate is reduced.

Description

technical field [0001] The present invention relates to the technical fields of quantum secure communication and optical communication, and more specifically, relates to a centrosymmetric QKD ring multi-user system and a key distribution method thereof. Background technique [0002] Quantum secure communication is different from classical communication. It does not rely on the complexity of mathematical calculations to increase the difficulty of eavesdroppers in a limited time, but to discover the existence of eavesdropping based on the basic principles and characteristics of quantum mechanics, so that the legitimate communication parties Encrypted information is theoretically unconditionally secure. With the development of information technology and the popularization of Internet applications, quantum secure communication has become a research hotspot in the interdisciplinary field of quantum physics and information science at home and abroad. [0003] The research directi...

Claims

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Application Information

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IPC IPC(8): H04L9/08H04B10/275H04B10/2563
CPCH04L9/0858H04B10/275H04B10/2563Y02D30/70
Inventor 郭邦红赵韬胡敏
Owner SOUTH CHINA NORMAL UNIVERSITY
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