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A local active phase compensation system and method

An active phase compensation system technology, applied in key distribution, can solve the problems of increasing the time and complexity of the active phase compensation process, and achieve the effects of improving system security, shortening scanning time, and increasing information duty cycle

Active Publication Date: 2019-10-22
SOUTH CHINA NORMAL UNIVERSITY
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AI Technical Summary

Problems solved by technology

During the phase compensation process, every time Alice adjusts the working point, Bob needs to scan 4 counting curves of single-photon interference, which increases the time and complexity of the active phase compensation process.
At the same time, the phase compensation process of the four-phase method requires information interaction between the two parties. However, the active phase compensation attack (APC) can obtain the exact phase information loaded by each photon according to the interaction information. This Might open a new back door for EVE

Method used

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  • A local active phase compensation system and method
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  • A local active phase compensation system and method

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Embodiment Construction

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations. Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts belong to the protection scope of the present invention.

[0035] see figure 1 , figure 2 , a local active ...

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Abstract

The invention provides a local active phase compensating system and method and relates to the field of quantum cryptographic communication. According to the local active phase compensating system and method, due to the fact that the process of obtaining interference ring working points of a signal sending terminal is completely completed locally and determination of temporary working points of a signal receiving terminal is also completely completed locally, scanning result transmission in classic channels is avoided, EVE cannot obtain phase information, and the system safety is improved. Intense light curves are scanned in the local compensation and united compensation process of the signal sending terminal and the signal receiving terminal, scanning time is shortened, and the information duty ratio is improved.

Description

technical field [0001] The invention relates to the field of quantum secure communication, in particular to a local active phase compensation system and method. Background technique [0002] Quantum key distribution is based on the basic principles of quantum mechanics, and it has been proved that it can theoretically achieve unconditional secure communication, which has attracted widespread attention from the society. Quantum key distribution can be divided into continuous variable quantum key distribution and discrete variable quantum key distribution. Among them, the discrete variable quantum key distribution system is closest to the practical application. The most commonly used encoding methods are phase encoding and polarization encoding. One of the important factors for stable operation. [0003] The four-phase scanning active phase compensation scheme of the phase-encoded quantum key distribution system in the prior art: Bob fixedly loads the modulation voltage, sca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L9/08
Inventor 王金东颜士玲兰立新方俊彬刘子豪陈艳辉马瑞丽郑如雪林加毅赵峰魏正军张智明
Owner SOUTH CHINA NORMAL UNIVERSITY
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