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

Pending Publication Date: 2018-09-14
RUBAN QUANTUM TECH CO LTD
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  • Abstract
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  • Application Information

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Problems solved by technology

[0022] The present invention proposes an improved HD-QKD system, which adopts a pulse generation device based on optical injection technology, combined with an X base vector detection module based on a Faraday rotating mirror, to solve the problem of phase randomization between pulse groups in the existing device, and achieve passive compensation for polarization drift

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

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Embodiment Construction

[0062] The HD-QKD system of the present invention includes a sending end and a receiving end that match each other. For the sending end, see Figure 4 A phase-modulated light source and an attenuator (ATT) are used. The phase-modulated light source specifically includes a phase-prepared laser, a pulse-generating laser, and a fiber circulator with three ports. The long pulse generated by the phase-prepared laser is input into the first port and injected through the second port. A pulse generating laser, the coded optical pulse group generated by the pulse generating laser is input to the second port and output to the ATT through the third port, and then sent to the receiving end.

[0063] The specific working principle of the sender is:

[0064] The drive voltage drives the phase-ready laser to generate periodic long pulses;

[0065] The long pulse is injected into a pulse-generating laser through a fiber optic circulator;

[0066] At the same time, the driving voltage of the...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/08H04B10/70
CPCH04B10/70H04L9/0858
Inventor 富尧朱伟
Owner RUBAN QUANTUM TECH CO LTD
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