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Real-time bit synchronization correction method for quantum key generation system

A technology for generating system and quantum keys, which is applied in the field of quantum communication, can solve problems such as the decrease of the detection count at the receiving end and the decrease of the security key generation rate, so as to improve efficiency, increase the rate of security key generation, and increase the effective working time Effect

Active Publication Date: 2020-08-07
BEIJING ZHONGCHUANGWEI NANJING QUANTUM COMM TECH CO LTD +1
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  • Application Information

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Problems solved by technology

[0015] This application provides a method for real-time bit synchronization of a quantum key generation system to solve the problem in the prior art that the detection count at the receiving end of the quantum key generation system decreases due to changes in the external environment, resulting in a decrease in the security key generation rate The problem

Method used

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  • Real-time bit synchronization correction method for quantum key generation system
  • Real-time bit synchronization correction method for quantum key generation system
  • Real-time bit synchronization correction method for quantum key generation system

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Experimental program
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Effect test

Embodiment 1

[0078] Step 101, the bit synchronization processing unit continuously reads the real-time count value of the detector and the corresponding real-time delay value of the detector, and obtains the relationship between the delay efficiency of the detector, the maximum count value of the detector per unit time and its corresponding optimal delay value. time value.

[0079] Detector count accumulation time T i The count value current_det_cnt of the detector unit time according to the current unit time i OK, the specific method is as follows:

[0080] When current_det_cnt i less than N i,1 pcs / s, detector counting effective accumulation time S i set to S i,1 ;

[0081] current_det_cnt i greater than N i,2 pcs / s, detector counting effective cumulative time T i set to S i,2 ;

[0082] current_det_cnt i not less than N i,1 pieces / second, and current_det_cnt i not greater than N i,2 pcs / s, detector counting effective accumulation time S i Set as;

[0083]

[0084] ab...

Embodiment 2

[0121] Step 201 is the same as step 101

[0122] Step 202 is the same as step 102

[0123] Step 203, the bit synchronization unit calculates the bit synchronization delay search range of each detector and the required search delay value.

[0124] The bit synchronization delay search range of the i-th detector Range i It is set according to the detector response characteristic. Usually, the relationship between the detection efficiency of a certain detector and its detection time is as follows: figure 2 As shown, where the vertical axis data has been normalized to the maximum count det_cnt of the detector max , then the bit synchronization delay search range Rangei of the i-th detector is calculated as follows:

[0125] Range i =ΔT i ×γi

[0126] In the formula, ΔT i for figure 2 The delay difference between the two delay values ​​corresponding to the lowest threshold set by the i-th detector, γ i It is a certain numerical value set artificially.

[0127] Under nor...

Embodiment 3

[0141] Step 301 is the same as step 101.

[0142] Step 302 is the same as step 102.

[0143] Step 303, calculating the bit synchronization delay search range of each detector and the required search delay value.

[0144] The bit synchronization delay search range of the i-th detector Range i It is set according to the detector response characteristic. Usually, the relationship between the detection efficiency of a certain detector and its detection time is as follows: figure 2 As shown, where the vertical axis data has been normalized to the maximum count det_cnt of the detector max , then the bit synchronization delay search range Range of the i-th detector i is calculated as follows:

[0145] Range i =ΔT i ×γ i

[0146] In the formula, ΔT i for figure 2 The delay difference between the two delay values ​​corresponding to the lowest threshold set by the i-th detector, γ i It is a certain numerical value set artificially.

[0147] Under normal circumstances, the...

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Abstract

The invention provides a real-time bit synchronization correction method for a quantum key generation system, and the method obtains the optimal delay value of a detector through the measurement of aplurality of local delay values, and achieves the real-time bit synchronization correction. The method comprises the following steps: (1) reading a real-time count value and a real-time delay value ofa detector, and obtaining a delay efficiency relationship, a unit time maximum count value and a corresponding optimal delay value; (2), determining whether a real-time bit synchronization process isstarted or not; (3) calculating a bit synchronization delay search range of each detector and a delay value required to be searched; (4) by the delay control unit, adjusting the delay value of each detector; (5), counting by a detector; (6), by the bit synchronization processing unit, determining whether the search of the bit synchronization delay search range is completed or not, and if not, executing the step (4) again; and (7) by the bit synchronization processing unit, obtaining the optimal time delay value of each detector for detection according to the count and sending the optimal timedelay value to the time delay control unit, and by the time delay control unit, controling the time delay setting of each detector according to the optimal time delay value so as to realize real-timebit synchronization correction.

Description

technical field [0001] The present application relates to the field of quantum communication, in particular to a real-time bit synchronization correction method of a quantum key generation system. Background technique [0002] Since the beginning of the 21st century, with the comprehensive promotion of the Internet, the level of global informatization has continued to improve, the government, national defense, enterprises, and individuals have increasingly paid attention to information security, and the demand for information security has also increased day by day. At the same time, information security is also facing more and more serious threats, especially the Shor algorithm based on quantum computers proposed in 1994, which subversively destroyed the basis of classical cryptography protocols based on computational complexity. [0003] In recent years, Quantum Key Distribution (QKD, Quantum Key Distribution) technology has attracted widespread attention, because its uncon...

Claims

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Application Information

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IPC IPC(8): H04L9/08H04B10/70
CPCH04B10/70H04L9/0852
Inventor 张立华李镇
Owner BEIJING ZHONGCHUANGWEI NANJING QUANTUM COMM TECH CO LTD
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