Duplex quantum key distribution system and synchronization method

A key distribution system and quantum technology, applied in the field of duplex quantum key distribution system and its synchronization, can solve the problems of synchronous light reflection, increase in system development cost, etc.

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, alth

Method used

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  • Duplex quantum key distribution system and synchronization method
  • Duplex quantum key distribution system and synchronization method
  • Duplex quantum key distribution system and synchronization method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] 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 .

[0057]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

[0073] 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:

[0074] 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

[0084] 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".

[0085] 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.

[0086] In this embodiment, a complete QKD device and a minimal synchronous optical receiving QKD device...

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Abstract

The invention discloses a duplex quantum key distribution system. The system comprises two paired QKD devices; each QKD device comprises a sending end and a receiving end, two paired QKD devices use apath of synchronization light, the synchronization light produced by the sending end of the first QKD device is output to the receiving end of the second QKD device, and the synchronization light produced by the sending end of the first QKD device is simultaneously sent to the receiving end of the first QKD device, and a synchronization signal received by the receiving end of the second QKD device is transmitted to the sending end of the second QKD device. The invention further discloses a synchronization method. Compared with the prior art, the system has the following advantages: a light path is constructed through the connection of common optical devices, the duplex QKD is realized by using one path of synchronization light, the operation is simple and easy; a problem that the QKD system cannot perform the duplex running due to the synchronization light reflection of the existing duplex QKD system is solved, and a channel with another wavelength is unnecessary to add.

Description

technical field [0001] The invention relates to the field of quantum secure communication, and in particular provides a duplex quantum key distribution system and a synchronization method thereof. 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 consi...

Claims

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Application Information

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IPC IPC(8): H04L9/08H04L7/033H04B10/69
CPCH04B10/691H04L7/033H04L9/0852
Inventor 姚海涛汤艳琳唐世彪
Owner QUANTUMCTEK SHANGHAI CO LTD
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