Quantum key distribution device used in duplex quantum key distribution system

A technology of quantum key distribution and key distribution system, which is applied to key distribution, can solve the problems of synchronous light reflection and increased system development cost, and achieve the effect of low development cost

Pending Publication Date: 2018-02-23
QUANTUMCTEK SHANGHAI CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In the prior art, each link of the duplex system uses its own synchronization light for synchronization, which causes the problem of synchronization light reflection
In addition, although the existing technical solution can solve this problem, the two links still use a separate synchronous optical solution, and this solution greatly increases the system development cost

Method used

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  • Quantum key distribution device used in duplex quantum key distribution system
  • Quantum key distribution device used in duplex quantum key distribution system
  • Quantum key distribution device used in duplex quantum key distribution system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Such as image 3 As shown, in this embodiment, in the duplex QKD system, the two QKD devices paired have the same structure, and the synchronous light generating and receiving device of each QKD device includes a crystal oscillator (Oscillator, OSC), a sending end phase-locked loop (PhaseLocked Loop, PLL), synchronous optical laser (LD, Laser Diode), optical beam splitter BS (Beam Splitter), adjustable optical attenuator, circulator, optical switch OSW (Optical Switch), PIN tube, receiving end phase-locked loop .

[0034]The crystal oscillator is connected to the phase-locked loop at the sending end, the output end of the phase-locked loop at the sending end is connected to the synchronous optical laser, the output end of the synchronous optical laser is connected to the input end of the optical beam splitter, and the splitting ratio of the optical beam splitter is N:1 , the end of the optical beam splitter with a ratio of N is connected to the circulator port 1 throug...

Embodiment 2

[0050] In the duplex QKD system, the two devices that work in a pair adopt an unequal design scheme, that is, for the two QKD systems that work in a pair in the first embodiment, only the part that participates in the work is designed at each end, and no redundant part is designed. Duplex QKD system-L and duplex QKD system-R are respectively designed as follows:

[0051] Such as Figure 6 As shown, the synchronous optical generating device of one of the paired duplex QKD systems-L includes a crystal oscillator (Oscillator, OSC), a sending end phase-locked loop (Phase Locked Loop, PLL), a synchronous optical laser (LD, LaserDiode), an optical splitter Beamer BS (Beam Splitter), adjustable optical attenuator, circulator, optical switch OSW (OpticalSwitch), PIN tube, receiver phase-locked loop. The crystal oscillator is connected to the phase-locked loop at the sending end, and the output end of the phase-locked loop at the sending end is connected to a synchronous optical laser...

Embodiment 3

[0061] For ease of description, each QKD device that is paired with the same structure in Embodiment 1 is called "complete QKD device", and in Embodiment 2, only the part that participates in the work is designed, and each QKD device that does not design redundant parts is called As "the simplest QKD device", and the "simplest QKD device" that sends synchronous light is called "the simplest synchronous light sending QKD device", and the "simplest QKD device" that receives synchronous light is called "the simplest synchronous light receiving QKD device". device".

[0062] In the second embodiment, the paired two QKD devices all adopt the QKD device with simplified structure. In the actual application process, it is inevitable that one of the QKD devices fails. If there is no simplified QKD device with the same structure on site, it will affect the Use of a duplex QKD system.

[0063] In this embodiment, a complete QKD device and a minimal synchronous optical receiving QKD device...

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Abstract

The invention discloses a QKD (Quantum Key Distribution) device used in a duplex QKD system. A crystal oscillator of a synchronous optical device is connected to a transmitting end phase-locked loop;an output end of the transmitting end phase-locked loop is connected with a synchronous optical laser; an output end of the synchronous optical laser is connected to an input end of an optical beam splitter; one end of which the proportion is N of the optical beam splitter is connected to a circulator port 1 through an adjustable optical attenuator; a circulator port 2 is an input / output port of synchronous light; one end of which the proportion is 1 of the optical beam splitter is connected with a port 1 of an optical switch; a port 3 of the circulator is connected with a port 2 of the optical switch; an output end of the optical switch is connected with a receiving end phase-locked loop through a PIN tube; and the receiving end phase-locked loop is connected with the transmitting end phase-locked loop. The invention also discloses two simplified QKD devices. The QKD device has the advantages that: a light path is formed by a connection between common optical devices, and duplex QKD can be performed with one path of synchronous light by pairing two QKD devices disclosed by the invention. The QKD device has the characteristics of simple structure, convenience and feasibility.

Description

technical field [0001] The invention relates to the field of quantum secure communication, and in particular provides a quantum key distribution device used in a duplex quantum key distribution system. Background technique [0002] Duplex Quantum Key Distribution (Quantum Key Distribution, QKD) system, that is, each QKD system includes a sender Alice and a receiver Bob, and a pair of devices can run two QKD links at the same time, as shown in figure 1 shown. [0003] A key technology in the QKD system is the information synchronization between the system sender (Alice) and the system receiver (Bob). Only when the photon pulse detected by the receiver is synchronized with the photon pulse sent by the sender, can both parties in the system extract a secure and consistent quantum key. [0004] In the prior art, each link of a duplex system uses an independent synchronization light for synchronization. Considering the large-scale application, the design of each QKD device is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/08H04L7/033H04B10/69
CPCH04B10/691H04L7/033H04L9/0852
Inventor 姚海涛贾云唐世彪
Owner QUANTUMCTEK SHANGHAI CO LTD
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