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A quantum key distribution system and method

A technology of quantum key distribution and quantum key, which is applied in the field of quantum key distribution system, can solve the problems such as the inapplicability of quantum key distribution system, achieve the effects of saving volume and power consumption, wide application range, and increasing speed

Active Publication Date: 2018-11-27
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The existing quantum key distribution system requires quantum channels to complete quantum key distribution, and also requires classical channels to assist in completing the data post-processing process, including basis vector verification, key error correction and privacy amplification, so the existing quantum key The distribution system not only needs to be equipped with quantum communication equipment, but also needs to be equipped with classical communication equipment. However, in the case of shortage of classical communication resources, this kind of quantum key distribution system that needs to be equipped with classical communication equipment is not applicable

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  • A quantum key distribution system and method
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  • A quantum key distribution system and method

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Embodiment 1

[0020] Due to the shortage of classical communication resources, additional investment is required to configure classical communication equipment. In view of this, if the equipment of the quantum key distribution system can be used to complete the classical communication function, then when performing quantum key distribution , there is no need for other classical communication equipment, so this embodiment proposes a quantum key distribution system for both quantum communication and classical communication, which can realize classical communication functions without adding classical communication equipment, that is, use quantum After the key is distributed by the communication equipment, this equipment can still be used to realize classical communication and complete the data post-processing of the quantum key distribution, which can reduce the cumbersomeness of equipment laying and save resources.

[0021] A quantum key distribution system proposed in this embodiment, such as...

Embodiment 2

[0025] This embodiment provides a quantum key distribution method for implementing quantum key distribution and data post-processing using the quantum key distribution system given in Embodiment 1, which includes a quantum distribution stage and a data post-processing stage. The quantum distribution stage includes the following step:

[0026] ①-1. Start the first communication system, select the first random number generator through the first mode selection module, then turn on the first random number generator, and then turn on the first optical attenuator through the first switch.

[0027] ①-2. In the case of ensuring the operation of the first communication system, at the sender of the first communication system, the first random number generator generates a batch of binary data, and triggers a first laser with every two bits of binary data ; The four first lasers respectively modulate the two bits of binary data received by themselves into corresponding polarization states...

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Abstract

The invention discloses a quantum key distribution system and method. The system includes a first communication system and a second communication system, each of the first communication system and the second communication system includes a sending end and a receiving end, the sending end of the first communication system and the receiving end of the second communication system are located at the same end, the receiving end of the first communication system and the sending end of the second communication system are located at the same end, both the first communication system and the second communication system can be switched between a quantum communication node and a classic communication mode, and when any one of the first communication system and the second communication system is in the quantum communication mode, the system is used for realizing quantum key distribution; and when both the first communication system and the second communication system are in the classic communication mode, post-processing is performed on an original key that is obtained, and a final safe key is extracted. The quantum key distribution system provided by the invention realizes quantum key distribution and data post-processing when the two communication systems work together, and a classic communication device does not need to be configured.

Description

technical field [0001] The invention relates to a quantum communication technology, in particular to a quantum key distribution system and method. Background technique [0002] A typical quantum communication system such as figure 1 As shown, the quantum information in the quantum information source undergoes quantum encoding and quantum modulation in turn to obtain modulation information. After the modulation information is transmitted through the quantum channel, it undergoes quantum demodulation and quantum decoding in turn to obtain decoding information. The final decoding information is obtained by the quantum The sink receives, in addition, in order to provide additional information necessary for quantum information processing, the quantum information in the quantum information source is post-processed, and the decoding information received by the quantum information sink is post-processed, and the quantum information source and the quantum information sink pass throug...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L9/08
Inventor 李杨曹蕾刘尉悦彭承志潘建伟
Owner UNIV OF SCI & TECH OF CHINA