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Channel self-adaptive method of quantum key distribution system and QKD (quantum key distribution) system based on channel self-adaptive method

A quantum key distribution and self-adaptive technology, applied in the field of quantum communication, can solve the problems of inability to achieve channel self-adaptation, increased time consumption of system initialization, and failure to complete.

Active Publication Date: 2015-05-20
QUANTUMCTEK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] 1. The existing QKD system uses signal light with the same intensity as the quantum key generation stage in the system initialization stage. The signal light is a weak light signal that has been attenuated to the single photon level. When it is too large, it will cause the system initialization process to take more time or even fail to complete, resulting in the QKD process between corresponding nodes cannot be established quickly and effectively, and the overall performance of the QKD network will decline;
[0012] 2. The existing QKD system cannot automatically adapt to quantum channels with large path attenuation, that is, channel adaptation cannot be achieved, which is not conducive to network operation

Method used

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  • Channel self-adaptive method of quantum key distribution system and QKD (quantum key distribution) system based on channel self-adaptive method
  • Channel self-adaptive method of quantum key distribution system and QKD (quantum key distribution) system based on channel self-adaptive method
  • Channel self-adaptive method of quantum key distribution system and QKD (quantum key distribution) system based on channel self-adaptive method

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Embodiment 1

[0152] see figure 2 , is the working flow chart of the QKD system of the specific embodiment of the present invention, a kind of channel self-adaptive method of quantum key distribution system, comprises the following steps:

[0153] Step 1: start;

[0154] Step 2: Carry out channel evaluation according to the parameters of the QKD system, establish a table 1 reflecting the relationship between the channel attenuation value and the theoretical total value of the detector, and then according to Table 1, establish a table reflecting the relationship between the actual total value of the detector and the compensation attenuation value 2;

[0155] Step 3: Delay scanning to obtain the scanning peak value;

[0156] Step 4: According to the scanning peak value, which is equivalent to the actual total count value of the detector, check the above table 2 to determine the compensation attenuation value to be issued;

[0157]Step 5: Send the compensation attenuation value to the QKD ...

Embodiment 2

[0198] The difference between the second embodiment and the first embodiment is that after the QKD system is started, the step of channel estimation in step 2 is not required to obtain the table, but the channel estimation is performed according to the parameters of the known QKD system, and Table 1 and Table 2 are calculated in advance , stored in the QKD system, when the QKD system is started, directly perform delay scanning to obtain the scanning peak value in step 3 and the following steps.

[0199] The method of performing channel estimation according to the parameters of the known QKD system is the same as that in the first embodiment.

Embodiment 3

[0201] see image 3 As shown, the channel adaptation method of a kind of quantum key distribution system of this embodiment comprises the following steps:

[0202] Step 100: start;

[0203] Step 200: Delayed scanning to obtain the scanning peak value;

[0204] Step 300: Substituting the obtained scanning peak value as the theoretical total count value X of the detector into the following statistical formula of the detector count:

[0205] Theoretical count value of each detector X i for

[0206] X i = γ × η × 10 ( r + R ) / 10 × f × 1 n

[0207] The theoretical total value of the detector X is

[0208] X = ...

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Abstract

The invention provides a channel self-adaptive method of a quantum key distribution system. The channel self-adaptive method comprises the following steps: at an initialization stage of the system, reducing attenuation, caused by a sending end, to signal light; increasing exit light intensity of the signal light; starting a system initialization process comprising delaying scanning and polarization feedback, so that the system initialization process is finished; after the system initialization process is finished, recovering the attenuation to the signal light to a single photon level corresponding to a default attenuation value; starting a quantum key generation process. The invention further provides a QKD (quantum key distribution) system based on the channel self-adaptive method of the quantum key distribution system. The channel self-adaptive method of the quantum key distribution system has the advantages that automatic estimation and channel attenuation compensation are carried out at the system initialization stage,, so that a method for properly increasing the signal light intensity is realized, the system initialization process can be smoothly finished, and the QKD process can be rapidly and effectively established. The method is good for networking operation of the QKD system, the working efficiency of the QKD system is improved, the operation stability and reliability are improved, and the whole performance of a QKD network is improved.

Description

technical field [0001] The invention relates to the field of quantum communication, and in particular provides a quantum channel self-adaptive method and a quantum key distribution system based on the method, which can improve the working efficiency and operational reliability of the QKD system in the quantum communication network, and have the advantages of quantum encryption Innovation and practicability in productization and commercialization of key distribution equipment. Background technique [0002] Quantum Key Distribution (QKD), as the most practical direction in the field of quantum communication, has made remarkable progress in recent years, and the research on QKD networks has also been vigorously developed. In a QKD network, the channel used to transmit signal light and synchronous light is usually called a quantum channel, and the channel used to transmit other information such as key negotiation information is called a classical channel. The quantum channel is ...

Claims

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Application Information

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IPC IPC(8): H04L9/08
Inventor 陈腾云唐世彪范永胜贾云
Owner QUANTUMCTEK
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