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Polarization coding quantum key distribution system encoder

A technology of quantum key distribution and polarization beam splitter, which is applied in quantum cryptography-related fields, can solve problems such as the inability to guarantee the consistency of lasers, and achieve the effect of ensuring system security and feasibility

Pending Publication Date: 2021-08-13
ANHUI QASKY QUANTUM SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Each laser encodes a different polarization state. Due to the differences between lasers, the consistency of multiple lasers in the frequency domain dimension cannot be guaranteed. As a result, the actual output polarization state can be distinguished in the frequency domain dimension, which poses a safety hazard.

Method used

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  • Polarization coding quantum key distribution system encoder
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Embodiment Construction

[0016] Referring to the accompanying drawings, through the description of the embodiments, the specific embodiments of the present invention include the shape, structure, mutual position and connection relationship of each part, the function and working principle of each part, and the manufacturing process of the various components involved. And the method of operation and use, etc., are described in further detail to help those skilled in the art have a more complete, accurate and in-depth understanding of the inventive concepts and technical solutions of the present invention.

[0017] The polarization-encoded quantum key distribution system encoder includes the following components:

[0018] The main laser, preferably a semiconductor laser, can be 45-degree linearly polarized light; provide an optical pulse signal of a specific wavelength;

[0019] A laser, preferably a semiconductor laser, emits an optical pulse signal of a specific wavelength and polarization state accord...

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Abstract

The invention discloses a polarization coding quantum key distribution system encoder. A main laser device emits 45-degree linearly polarized light pulse laser signals, the 45-degree linearly polarized light pulse laser signals are divided into horizontal linearly polarized light and vertical linearly polarized light through a beam splitter and a polarization beam splitter, and the horizontal linearly polarized light and the vertical linearly polarized light are injected into a laser device 1, a laser device 2, a laser device 3 and a laser device 4 respectively, and the emergent polarized light and the injected polarized light of different lasers are consistent, and finally, single photon transmission is attenuated through beam combination. According to the encoder, the frequency domain consistency among multiple lasers can be realized under the condition that the lasers are adopted at the transmitting end of the polarization encoding quantum key transmitting system, so that the engineering implementation feasibility is ensured, and the system safety is also ensured.

Description

technical field [0001] The invention relates to the technical field related to quantum cryptography, in particular to a quantum key distribution system using a polarization coding scheme. Background technique [0002] The quantum key distribution system can provide theoretically secure symmetric keys for both communication parties, so it has attracted much attention for many years. The BB84 protocol is the first quantum key distribution protocol and is currently the most widely used in engineering applications. Its theoretical security has been proven. Polarization-encoded quantum key distribution systems often use multiple lasers to randomly encode four polarization quantum states. Especially in free-space systems, when the modulation rate is very fast, there is no practical high-speed polarization modulation device. Each laser encodes a different polarization state. Due to the differences between lasers, the consistency in the frequency domain dimension of multiple lasers...

Claims

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Application Information

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IPC IPC(8): H04L9/08H04B10/50H04B10/61H04B10/70H04B10/80
CPCH04L9/0852H04B10/503H04B10/70H04B10/802H04B10/614
Inventor 张启发李雷秦勇俞畅王立霞朱文正朱萍徐猛张俊徐斌
Owner ANHUI QASKY QUANTUM SCI & TECH CO LTD
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