Two-node measuring equipment unrelated quantum key distribution system

A quantum key distribution and measurement equipment technology, applied in the field of two-node measurement equipment independent quantum key distribution system, can solve the problems of different time jitter, difficult time synchronization, etc., to eliminate time jitter, improve system stability, and time synchronization easy-to-achieve effects

Active Publication Date: 2015-04-29
SOUTH CHINA NORMAL UNIVERSITY
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Problems solved by technology

[0010] 5. The time jitter of the pulse transmitted from Alice to Charlie is different from the pulse transmitted from Bob to Charlie, so it is difficult to achieve time synchronization

Method used

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  • Two-node measuring equipment unrelated quantum key distribution system
  • Two-node measuring equipment unrelated quantum key distribution system
  • Two-node measuring equipment unrelated quantum key distribution system

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Embodiment Construction

[0040] The accompanying drawings are for illustrative purposes only and cannot be construed as limiting the patent;

[0041] In order to better illustrate this embodiment, some parts in the drawings will be omitted, enlarged or reduced, and do not represent the size of the actual product;

[0042] For those skilled in the art, it is understandable that some well-known structures and descriptions thereof may be omitted in the drawings.

[0043] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0044] The purpose of the present invention is to propose a two-node measurement equipment-independent quantum key distribution system device to achieve the purpose of system self-compensation and solve the problem of poor stability of the existing system.

[0045] figure 2 It is a two-node measurement device-independent quantum key distribution system model, and the analysis shows that the ...

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Abstract

The invention discloses a two-node measuring equipment unrelated quantum key distribution system. Two independent laser devices and a measuring device Charlie are all placed on the same node, namely an Alice end or a Bob end to form the two-node bidirectional transmission quantum key distribution system. According to the system, a two-node structure is adopted, the Faraday conjugated rotation effect is utilized, and the same transmission path is designed; as a result, the problem that an existing three-node measuring equipment unrelated quantum key distribution system is poor in stability due to polarization change, phase drift, non-uniform phase reference systems, time jitter and other factors is effectively solved, the purposes of polarization self-compensation, phase drift self-compensation, calibration-free phase reference systems and easy synchronization are achieved, and an important basis is provided for practical application of the measuring equipment unrelated quantum key distribution system.

Description

technical field [0001] The invention relates to the field of quantum key distribution in the field of communication, in particular to a two-node measurement device-independent quantum key distribution system. Background technique [0002] The measurement equipment-independent quantum key distribution system is currently recognized as a quantum key distribution system with high security and broad application prospects. In particular, its high security is unmatched by other quantum key distribution systems. According to the different encoding methods, measurement equipment-independent quantum key distribution systems are divided into two categories: polarization encoding and phase encoding. The initial measurement device-independent quantum key distribution system uses polarization encoding, but due to the influence of fiber birefringence and time jitter, random changes in the pulse polarization state affect the Bell state response results, resulting in poor system stability,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/08
Inventor 王金东解文钟金璇杜亚男魏正军秦晓娟於亚飞张智明
Owner SOUTH CHINA NORMAL UNIVERSITY
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