Quantum key transmission device and system

A quantum key and quantum technology, which is applied in the field of quantum communication, can solve the problems of reduced signal-to-noise ratio and the inability of the receiving end to be miniaturized, and achieve the effect of increasing the transmission ratio and improving the signal-to-noise ratio.

Active Publication Date: 2020-02-04
HUAWEI TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] This application provides a quantum key transmission device and system, which can be used to solve the problem that the receiving end cannot be miniaturized and the signal-to-noise ratio is reduced when time division multiplexing and polarization multiplexing are used to isolate quantum signals and local oscillator signals. question

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  • Quantum key transmission device and system
  • Quantum key transmission device and system
  • Quantum key transmission device and system

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Embodiment Construction

[0091] In order to make the purpose, technical solution and advantages of the present application clearer, the implementation manners of the present application will be further described in detail below in conjunction with the accompanying drawings.

[0092] figure 1 It is a schematic structural diagram of a quantum key sending device provided in the embodiment of this application. Such as figure 1 As shown, the device includes a laser 101 , a beam splitter 102 , a quantum signal preparation module 103 and a polarization controller 104 .

[0093] Wherein, the laser 101 is used to output the first optical signal. The beam splitter 102 is used to receive the first optical signal, divide the first optical signal into a second optical signal and a third optical signal, send the second optical signal through the first optical fiber, and send the second optical signal to the quantum signal preparation module 103 Send the third optical signal; the quantum signal preparation module...

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Abstract

The invention discloses a quantum key transmission device and a quantum key transmission system, and belongs to the technical field of quantum communication. In the present application, the quantum key transmission device can adjust the polarization directions of the quantum signal and the reference signal through the polarization controller. A local oscillator signal and an adjusted quantum signal are respectively sent to different optical fibers for transmission. Therefore, the local oscillator signal and the quantum signal do not need to be isolated through a time division multiplexing modeand a polarization multiplexing mode, and on the basis, an additional optical path difference does not need to be introduced into a quantum signal receiver of the receiving end to carry out delay compensation, so that the receiving end can be integrated and miniaturized.

Description

technical field [0001] The present application relates to the technical field of quantum communication, in particular to a quantum key transmission device and system. Background technique [0002] Quantum secure communication is a new type of communication technology developed in the past thirty years. Quantum secure communication is the product of the combination of quantum characteristics and traditional cryptography. It mainly uses the basic principles and characteristics of quantum mechanics to ensure the security of communication. At present, the closest practical technology in quantum secure communication is quantum key transmission. Among them, quantum key transmission refers to carrying a random key in a quantum signal for transmission. [0003] In the prior art, when performing quantum key transmission, the sending end can prepare a local oscillator signal and a quantum signal, and transmit the local oscillator signal and the quantum signal to the receiving end th...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): H04L9/08H04B10/70H04B10/25
CPCH04L9/0852H04B10/70H04L9/0858H04L2209/122
Inventor李政宇肖新华吴裕平
OwnerHUAWEI TECH CO LTD