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Active phase compensation method and device of joint scan

A technology of active phase and compensation method, applied in key distribution, which can solve the problems of increasing phase scanning time and complexity

Active Publication Date: 2013-07-10
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the four-phase scanning method needs to scan the interference curve at Bob's end four times, which increases the time and complexity of phase scanning, and requires Bob to transmit the scanning results to Alice through a public channel, so that Eve can obtain the information of the phase scanning. Remapping attacks or side-channel attacks offer the possibility of causing related security issues

Method used

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  • Active phase compensation method and device of joint scan
  • Active phase compensation method and device of joint scan
  • Active phase compensation method and device of joint scan

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Embodiment 1

[0058] Such as figure 1 , 2 Shown is the scanning schematic diagram of the Alice end when the present invention is applied in the double MZ system; Add an intermediate ring at the Alice end, and it interferes with the rings of the Alice and Bob ends respectively, so as to obtain the phase drift parameters of the phase modulators at the Alice and Bob ends , and then make compensations respectively. The Alice end includes first and second lasers, a phase modulator PMA, a delay ring DL1, an isolator ISO1, an isolator ISO2, a coupler C1-C2, a single photon detector SPD3 and an intermediate ring; the intermediate ring includes a coupler C3, C4, delay loop DL3;

[0059] The first laser is respectively connected to the phase modulator PMA and the delay loop DL1 through the coupler C1, the phase modulator PMA and the delay loop DL1 are connected in parallel, and the phase modulator PMA and the delay loop DL1 are respectively connected to the two input ends of the coupler C2 , one o...

Embodiment 2

[0091] Such as image 3 , 4 , Alice end includes Faraday mirror FM1-FM2, first and second lasers, phase modulator PMA, coupler BS1-BS2, circulator CIR1-CIR2, delay ring DL1, single photon detector SPD and intermediate ring, the intermediate ring Including the delay ring DL2 and the Faraday mirror FM3-FM4; the laser emitted by the first laser enters the coupler BS1 and is divided into two pulses, which go through the long arm and the short arm respectively, and are reflected back to the other side of the coupler BS1 by the Faraday mirror FM1 and Faraday mirror FM2 One end enters the first port of the circulator CIR1, and enters the middle ring from the second port of the circulator CIR1. After passing through the coupler BS2, it is divided into 4 pulses, respectively reflected by the Faraday mirror FM3 and the Faraday mirror FM4 back to the coupler BS2; The two pulses of walking the short arm after the arm and walking the short arm first and then the long arm interfere at the ...

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Abstract

The invention discloses an active phase compensation method and device of joint scan. A middle ring is added at an Alice end, the middle ring respectively interferes and scans a ring of the Alice end and a ring of a Bob end to respectively obtain the interference curve of the Alice end and the interference curve of the Bob end, so that the phase drift parameter of a phase modulator is obtained, and then active phase compensation is respectively conducted to the Alice end and the Bob end. In the active phase compensation method and device of the joint scan, the Alice end and the Bob end only need to be scanned once, scanning time is shortened, and the safety of a system is improved. The active phase compensation method and device further shortens the time of phase scanning, lowers the complexity of phase scanning, and is used for achieving independent scanning of the Alice end and the Bob end and avoiding phase remapping attack or side channel attack.

Description

technical field [0001] The present invention relates to the field of quantum key distribution, and more specifically, to an active phase compensation method and device for joint scanning. Background technique [0002] Phase drift is an inherent problem in phase-encoded quantum key distribution (QKD) systems, and is one of the important factors affecting the practical performance of QKD systems. Compensation scheme for single-phase scanning active phase: Assume that the voltage applied to the phase modulator at Alice's end and the modulated phase are linear, so that only the interference curve at Bob's end is scanned. In actual devices, the voltage loaded by the phase modulator and the modulated phase are not linear, so an active phase compensation scheme of four-phase scanning method is proposed. However, the four-phase scanning method needs to scan the interference curve at Bob's end four times, which increases the time and complexity of phase scanning, and requires Bob to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/08
Inventor 周梦颖王金东董照月于宁娜魏正军张智明刘颂豪
Owner SOUTH CHINA NORMAL UNIVERSITY
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