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Method and device for reducing bit error rate of qkd system

A technology of bit error rate and voltage, applied in the field of reducing the bit error rate of the QKD system, can solve the problems of jumping in the interference result, difficult to guarantee the signal phase difference, and the bit error rate of the QKD system, etc., to ensure the effect of normal operation.

Active Publication Date: 2022-01-07
QUDOOR TECH INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to hysteresis and nonlinear phenomena in the phase shifter during the voltage reduction process, the positive half-wave voltage and the reverse half-wave voltage do not pass through, and the half-wave voltage also changes during the voltage increase process. , the phase difference of the two beams of optical signals input to the two arms of the interferometer in the QKD system is difficult to ensure that it is an integer multiple of 2π, and the interference result of the two beams of optical signals is prone to jumps, resulting in an increase in the bit error rate of the QKD system. Takes a long time to correct, QKD system breaks

Method used

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  • Method and device for reducing bit error rate of qkd system
  • Method and device for reducing bit error rate of qkd system

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Experimental program
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Effect test

Embodiment 1

[0046] like figure 1 As shown, the method for reducing the bit error rate of the QKD system provided by the embodiment of the present invention includes the following steps:

[0047] S101, judging in real time whether the voltage across the phase shifter is a preset maximum value or minimum value.

[0048] Specifically, the preset maximum value is a maximum voltage value that can ensure the normal operation of the phase shifter, and the preset minimum value is an extremely small voltage value that can ensure the normal operation of the phase shifter.

[0049] As an optional implementation manner of the present invention, before step S101, the method further includes:

[0050] Connect the phase shifter to the QKD system and start the QKD system;

[0051] Continuously adjust the voltage at both ends of the phase shifter to ensure that the phase difference between the two optical signals of the two arms of the interferometer in the QKD system remains unchanged.

[0052] S102. ...

Embodiment 2

[0070] like figure 2 As shown, the device for reducing the bit error rate of the QKD system provided by the embodiment of the present invention includes:

[0071] The judging module is configured to judge in real time whether the voltage across the phase shifter is a preset maximum value or a minimum value;

[0072] An adjustment module configured to lower the voltage to any voltage in the pre-generated second voltage sequence when the voltage is a preset maximum value;

[0073] The adjustment module is further configured to increase the voltage to any voltage in the pre-generated first voltage sequence when the voltage is a preset minimum value.

Embodiment approach

[0074] As an optional embodiment of the present invention, the device also includes:

[0075] an increasing module configured to increase the voltage across the phase shifter step by step until the voltage reaches a preset maximum voltage;

[0076] The first statistical module is configured to count the contrast of the optical signal after being interfered by the interferometer in the QKD system under different voltages;

[0077] The first generation module is configured to generate a first function graph between voltage and contrast according to multiple contrast obtained by different voltages;

[0078] The first generation module is further configured to, according to the first function graph, count the corresponding voltages when the value of the contrast reaches a maximum, and generate a first voltage sequence {M1, M2, M3...Mi}.

[0079] As an optional embodiment of the present invention, the device also includes:

[0080] The reducing module is configured to, when the v...

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Abstract

The method and device for reducing the bit error rate of the QKD system disclosed by the present invention relate to the field of quantum communication. By judging in real time whether the voltage at both ends of the phase shifter is the preset maximum or minimum value, if the voltage is the preset maximum value, the voltage is adjusted down to any voltage in the pre-generated second voltage sequence, and if the voltage is the preset minimum value, the voltage is adjusted up to any voltage in the pre-generated first voltage sequence, The accurate jump of the voltage is realized, which can ensure that the bit error rate of the QKD system remains at a low level when the voltage jumps, ensuring the normal operation of the QKD system.

Description

technical field [0001] The invention relates to the field of quantum communication, in particular to a method and device for reducing the bit error rate of a QKD system. Background technique [0002] In the process of phase compensation for the Quantum Key Distribution (QKD) system, the ambient temperature will continue to change in the same direction (increase or decrease). Accordingly, the voltage applied across the phase shifter needs to be adjusted in the same direction. But when the voltage value is adjusted to the preset maximum voltage, the voltage needs to be lowered. Due to hysteresis and nonlinear phenomena in the phase shifter during the voltage reduction process, the positive half-wave voltage and the reverse half-wave voltage do not pass through, and the half-wave voltage also changes during the voltage increase process. , the phase difference of the two beams of optical signals input to the two arms of the interferometer in the QKD system is difficult to ensu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L9/08H04L1/00
CPCH04L9/0852H04L9/0858H04L1/0078Y02D30/50
Inventor 陈柳平王林松王其兵范永胜劳卫伦索智鑫王嘉延
Owner QUDOOR TECH INC