Improved HD-QKD (High-Dimensional Quantum Key Distribution) system

A base vector and encoding technology, applied in transmission systems, digital transmission systems, and key distribution, to achieve the effects of easy integration, solution to polarization drift, modulation stability, and high speed
CN108540283APending Publication Date: 2018-09-14RUBAN QUANTUM TECH CO LTD
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
RUBAN QUANTUM TECH CO LTD
Publication Date
2018-09-14

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Abstract

The invention discloses an improved HD-QKD system which comprises a sending end and a receiving end which are matched. The sending end carries out basis vector modulation and decoy state modulation onlight pulses on the basis of a light injection and internal modulation mode to obtain encoded light pulse groups, and after being attenuated, the light pulse groups are sent to the receiving end; andafter carrying out beam splitting on the encoded light pulse groups from the sending end, the receiving end respectively utilizes a Z basis vector detection and an X basis vector detection module tocarry out detection, wherein the X basis vector detection module comprises an interference module with a faraday rotator mirror and single photon detectors corresponding encoding dimensions of the light pulses, and each single photon detector respectively detects a corresponding interference result. The invention solves a problem of phase randomness among the pulse groups in an existing device anda problem of polarization drifting of the existing device.
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Description

technical field

[0001] The invention relates to the technical field of quantum communication, in particular to a high-dimensional quantum key distribution system. Background technique

[0002] Quantum key distribution system (QKD) can realize remote two or more parties to share secure keys through insecure channels. And the devices used in the QKD system are basically existing general-purpose optical devices, and its transmission line can be carried out by using existing optical fibers or directly through vacuum, without any special devices and transmission lines to make it quickly practical. At the same time, the advent of quantum computers will have a huge impact on the existing public key system, which will no longer be safe. The one-time pad encryption system based on the QKD system is unconditionally safe, and it is hoped that the communication security problem can be solved once and for all. Therefore, QKD research has very important practical value.

[0003] The tr...

Claims

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