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A synchronization method and device for a quantum key distribution system

A quantum key distribution and synchronous optical technology, applied in key distribution, can solve the problem that QKD links cannot run at the same time, and achieve the effect of facilitating identification of link quality, facilitating mass production, and simple and convenient equipment operation

Active Publication Date: 2018-01-02
QUANTUMCTEK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] The present invention provides a synchronization method and device for a quantum key distribution system, which is used to solve the synchronization light reflection caused by the same wavelength of synchronization light between Alice of QKD device_L and Alice of QKD device_R in a duplex QKD system Will cause the problem that two QKD links cannot run at the same time

Method used

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  • A synchronization method and device for a quantum key distribution system
  • A synchronization method and device for a quantum key distribution system
  • A synchronization method and device for a quantum key distribution system

Examples

Experimental program
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Effect test

Embodiment 1

[0066] Embodiment one (using synchronous optical lasers of two different wavelengths)

[0067] Option1 (the wavelength of the synchronization light sent by Alice is determined by the control module):

[0068] Such as Image 6 As shown, Alice in QKD device_L and QKD device_R are equipped with two synchronous optical lasers—synchronous optical laser 1 and synchronous optical laser 2, wherein synchronous optical laser 1 fixedly transmits synchronous optical sync1 with a wavelength of λ 1 , the synchronous optical laser 2 fixedly transmits the synchronous optical sync2 with a wavelength of λ 2 , and λ 1 ≠λ 2 . Both QKD equipment_L and QKD equipment_R’s Bob are equipped with two-stage optical filter devices. The first-stage optical filter device can separate signal light and synchronous light, and the second-stage optical filter device can separate two channels of synchronous light with different wavelengths. light, such as image 3 shown. The second-stage optical filter d...

Embodiment 2

[0078] Embodiment two (using a synchronous optical laser with variable wavelength)

[0079] Option1 (the wavelength of the synchronization light sent by Alice is determined by the control module):

[0080] Such as Figure 7 As shown, Alice in QKD device_L and QKD device_R both use a wavelength-tunable synchronous optical laser, and the wavelength-tunable synchronous optical laser can send synchronous optical sync1 with a wavelength of λ 1 , can also send synchronous light sync2, the wavelength is λ 2 , and λ 1 ≠λ 2 , the wavelength of which transmits synchronous light is scheduled by the control module. Both QKD equipment_L and QKD equipment_R’s Bob are equipped with two-stage optical filter devices. The first-stage optical filter device can separate signal light and synchronous light, and the second-stage optical filter device can separate synchronous light of different wavelengths. Such as image 3 shown. Send the separated two channels of synchronous light into the c...

Embodiment 3

[0088] Embodiment 3 (a synchronous optical laser with a different wavelength is used at both ends of the system respectively)

[0089] Such as Figure 8 As shown, QKD equipment_L and QKD equipment_R respectively use a synchronous optical laser with different wavelengths, and synchronous optical laser 1 fixedly transmits a wavelength of λ 1 The synchronous optical sync1, the synchronous optical laser 2 fixedly sends a wavelength of λ 2 The synchronization light sync2, and λ 1 ≠λ 2 . The Bob of QKD equipment_L and QKD equipment_R both use a first-stage optical filter device to separate signal light and synchronous light. The separated synchronous light is sent to the discriminator, and the discriminator 1 fixedly discriminates the central wavelength as λ 1 The synchronous light sync1, the discriminator 2 fixedly discriminates the central wavelength as λ 2 The synchronization light sync2.

[0090] The specific implementation is as follows: on the link between Alice in QKD ...

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Abstract

The invention provides a synchronization method of a quantum key distribution system. The quantum key distribution system is a duplex QKD system, and Alice of the QKD device at both ends of the duplex QKD system can send out two kinds of synchronous lights with different wavelengths respectively. The light is transmitted in the same optical fiber link, so that when two QKD links run on the optical fiber link at the same time, the wavelengths of the synchronous light on the two links are different, and the Bob of the QKD equipment at both ends uses an optical filter to separate the synchronous light , and then use the corresponding discriminator to discriminate the synchronous light. The invention also provides a synchronization device of the quantum key distribution system. The advantages of the present invention are that: the two ends of the duplex QKD system use synchronous light of different wavelengths respectively, which solves the problem that the duplex QKD system cannot operate in full duplex due to the reflection of synchronous light, and the equipment is simple and convenient to operate and convenient for mass production.

Description

technical field [0001] The invention relates to the field of quantum secure communication, and in particular provides a synchronization method of a quantum key distribution system and a duplex QKD system based on the synchronization method. Background technique [0002] The fundamental difference between Quantum Key Distribution (QKD) and the classical key system is that it uses a single photon or entangled photon pair as the carrier of the key, and the basic principles of quantum mechanics guarantee that the process cannot be eavesdropped or Decipherability, thus providing a more secure key system. At present, the technology of using entangled photon pairs to realize quantum key distribution is not very mature, and there is still a considerable distance from practicality; while the technology of quantum key distribution based on single photon has been gradually matured. [0003] Quantum key distribution technology based on single photon usually has two encoding methods: po...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L9/08H04J14/02H04B10/25
CPCH04J14/0242H04L9/0852H04B10/2589
Inventor 唐世彪姚海涛贾云
Owner QUANTUMCTEK
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