CN207442862U - For the sychronisation of multichannel quantum key distribution system - Google Patents
For the sychronisation of multichannel quantum key distribution system Download PDFInfo
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- CN207442862U CN207442862U CN201721204512.5U CN201721204512U CN207442862U CN 207442862 U CN207442862 U CN 207442862U CN 201721204512 U CN201721204512 U CN 201721204512U CN 207442862 U CN207442862 U CN 207442862U
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Abstract
The utility model discloses a kind of sychronisations for multichannel quantum key distribution system, including transmitting terminal and receiving terminal, transmitting terminal includes homologous clock module, multichannel quantum key distribution system transmitting terminal, the first protocol resolution module, the first optical module driving unit and the first optical module, and receiving terminal includes the second optical module, the second optical module driving unit, second protocol parsing module and multichannel quantum key distribution system receiving terminal；Homologous clock module is connected with multichannel quantum key distribution system transmitting terminal, and multichannel quantum key distribution system transmitting terminal is electrically connected with the first protocol resolution module, and the first protocol resolution module is electrically connected with the first optical module driving unit；The utility model transmitting terminal uses same clock source, and multichannel classical signals and synchronizing signal are merged in a channel, therefore the utility model can both save multichannel allusion quotation signal and the driving circuit and electrooptic conversion module of synchronizing signal, can also simplify the complexity of channel wavelength-division multiplex.
Description
Technical field
The utility model is related to quantum key distribution technical fields, and in particular to one kind is used for multichannel quantum key distribution system
The sychronisation of system.
Background technology
Quantum-key distribution is a crossing domain of quantum information and computer science perfect adaptation, it is managed using quantum
By to realize method that the exchange of real security information provides a theoretically unconditional security.Field of quantum secure communication is just
Flourish, and clearly propose " quantum key distribution " this concept be the Bennett of IBM companies and it is Canadian
Brassard.Two people have published paper in the IEEE computers world conference of 1984《Public-Key
Distribution and coin tossing》.It elaborates to carry out key distribution using the polarization state coding of photon in paper
Basic principle and experiment conceive, which delivers the birth for indicating quantum cryptography, this later method became famous
BB84 agreements.Quantum secret communication is gradually from laboratory proofing, short distance, the low QKD models into code check since then,
Through start toward networking, remote and high efficiency height into code check high stability System Development.Has minority both at home and abroad at present
Company has carried out QKD system commercial applications, and the coverage of domestic QKD networks has also just initially formed.It is main at present logical
The method of lifting system quantum light transmission frequency is crossed to promote the generation rate of safe code check, but by electronics and optical limit
The following impossible unconfined raising of system, can be for the node that some main nodes or high code check are applied, safe key
Demand future will persistently become more, this will restrict the large-scale use of quantum key dispatching system.At present, some networks are in master
It has begun to generate safe key parallel using more set quantum-key distribution equipment on the circuit of main line and big data quantity.Quantum
Key distribution system needs three channels in the communications, is respectively quantum channel, synchronizing channel and classical communication channel, it is general and
Speech quantum channel is used for transmission quantum light, and synchronizing channel is used for transmission synchronizing signal, and classical communication channel sieves for primary key
Base, authentication, error correction and secrecy are amplified in choosing.In general, in order to save channel, it can be by multichannel quantum channel, synchronization
Channel and classical communication channel wavelength-division multiplex or by synchronizing channel and classical communication combining channel, but with multiplex system
Increase, practical operation and the difficulty used will increase.
For the node of high safety code check application, by electronics and optical limitation it is following can not possibly unconfined raising,
It has begun to generate safe key parallel using more set quantum-key distribution equipment at present.Since quantum key distribution system is logical
Three channels are needed in letter, it will be big for the complexity for more covering wavelength division multiplexed channel when quantum-key distribution equipment uses simultaneously
Width is improved, it is necessary to which Multi-path synchronous signal and the driving circuit and electrooptic conversion module of classical signals, channel wavelength-division multiplex are more multiple
It is miscellaneous.
Utility model content
Technical problem to be solved in the utility model is to provide one kind in view of the above shortcomings of the prior art for multichannel
The sychronisation of quantum key distribution system, when this is used for the sychronisation of multichannel quantum key distribution system according to the overwhelming majority
For receiving terminal all without this feature of the output of detectable signal, transmitting terminal uses same clock source, and multichannel is passed through in the clock cycle
Allusion quotation signal and synchronizing signal merge in a channel, therefore the utility model can both save multichannel allusion quotation signal and synchronizing signal
Driving circuit and electrooptic conversion module, the complexity of channel wavelength-division multiplex can also be simplified.
To realize above-mentioned technical purpose, the technical solution that the utility model is taken is：
A kind of sychronisation for multichannel quantum key distribution system, including transmitting terminal and receiving terminal, the transmitting terminal
It is single including homologous clock module, multichannel quantum key distribution system transmitting terminal, the first protocol resolution module, the driving of the first optical module
Member and the first optical module, the receiving terminal include the second optical module, the second optical module driving unit, second protocol parsing module and
Multichannel quantum key distribution system receiving terminal；
The homologous clock module is connected with quantum key distribution system transmitting terminal described in multichannel, quantum key described in multichannel
Dissemination system transmitting terminal is connected with quantum key distribution system receiving terminal quantum communications described in multichannel, quantum key described in multichannel point
Hair system transmitting terminal is electrically connected with the first protocol resolution module, first protocol resolution module and the first optical module driving unit
Electrical connection, the first optical module driving unit are electrically connected with the first optical module, and first optical module and the second optical module pass through
Allusion quotation communicates to connect, and second optical module is electrically connected with the second optical module driving unit, the second optical module driving unit and
Second protocol parsing module is electrically connected, the second protocol parsing module and quantum key distribution system receiving terminal electricity described in multichannel
Connection.
As the further improved technical solution of the utility model, the first quantum key wavelength division multiplexer and second are further included
Quantum key wavelength division multiplexer, quantum key distribution system transmitting terminal described in multichannel connect with the first quantum key wavelength division multiplexer
It connects, quantum key distribution system receiving terminal described in multichannel is connected with the second quantum key wavelength division multiplexer, first quantum
Key wavelength division multiplexer is connected by simple optical fiber with the second quantum key wavelength division multiplexer quantum communications.
As the further improved technical solution of the utility model, first optical module passes through simple optical fiber and the second light
Module classical communication connects.
As the further improved technical solution of the utility model, the homologous clock module uses phase-locked loop clock
Device or crystal oscillator.
As the further improved technical solution of the utility model, first protocol resolution module include coding module and
First fifo module, the coding module are connected with quantum key distribution system transmitting terminal, the coding module and the first FIFO
Module connects；The second protocol parsing module includes decoder module and the second fifo module, the decoder module and second
Fifo module connects, and second fifo module is connected with quantum key distribution system receiving terminal.
As the further improved technical solution of the utility model, the quantum key distribution system transmitting terminal includes light
Source, transmitting terminal quantum state prepare module, optical attenuator and transmitting terminal control circuit module, the light source and transmitting terminal quantum state system
Standby module is connected by optical fiber, and the transmitting terminal quantum state prepares module and is connected with optical attenuator by optical fiber, the optical attenuation
Device is connected with the first quantum key wavelength division multiplexer by optical fiber, the control circuit module respectively with light source, transmitting terminal quantum
State prepares module and optical attenuator electrical connection, and the control circuit module is electrically connected with the first protocol resolution module.
As the further improved technical solution of the utility model, the quantum key distribution system receiving terminal includes receiving
Control circuit module, receiving terminal quantum state is held to prepare module and single-photon detector, the receiving terminal control circuit module difference
Module is prepared with receiving terminal quantum state and single-photon detector is electrically connected, the receiving terminal control circuit module and second protocol solution
Analyse module electrical connection.
The utility model, all without this feature of the output of detectable signal, is incited somebody to action according to receiving terminal in most clock cycle
Multichannel quantum key distribution system transmitting terminal and multichannel quantum key distribution system receiving terminal it is parallel in use, can will it is all together
Step signal and classical signals are transmitted by a combining channel；Multichannel quantum key distribution system transmitting terminal uses same clock
Source so that run simultaneously even if synchronizing signal all the way can be only used and much cover quantum key distribution equipment.Therefore this practicality is new
Type can both save multichannel allusion quotation signal and the driving circuit and electrooptic conversion module of synchronizing signal, can also simplify channel wavelength-division and answer
Complexity.
Description of the drawings
Fig. 1 is the structure diagram of the transmitting terminal of the utility model.
Fig. 2 is the structure diagram of the receiving terminal of the utility model.
Fig. 3 is the structure diagram of the quantum key distribution system transmitting terminal of the utility model.
Fig. 4 is the structure diagram of the quantum key distribution system receiving terminal of the utility model.
Specific embodiment
Specific embodiment of the utility model is made below according to Fig. 1 to Fig. 4 and being illustrated:
Referring to Fig. 1 and Fig. 2, a kind of sychronisation for multichannel quantum key distribution system, including transmitting terminal and reception
End, the transmitting terminal include homologous clock module, multichannel quantum key distribution system transmitting terminal, the first protocol resolution module, the
One optical module driving unit and the first optical module, the receiving terminal include the second optical module, the second optical module driving unit, second
Protocol resolution module and multichannel quantum key distribution system receiving terminal；The homologous clock module and quantum key described in multichannel point
Hair system transmitting terminal connects, and quantum key distribution system transmitting terminal described in multichannel is received with quantum key distribution system described in multichannel
Looking somebody up and down son communication connection, quantum key distribution system transmitting terminal is electrically connected with the first protocol resolution module described in multichannel, and described the
One protocol resolution module is electrically connected with the first optical module driving unit, the first optical module driving unit and the first optical module electricity
Connection, first optical module are connected with the second optical module classical communication, and second optical module and the driving of the second optical module are single
Member electrical connection, the second optical module driving unit are electrically connected with second protocol parsing module, the second protocol parsing module
It is electrically connected with quantum key distribution system receiving terminal described in multichannel.
The present embodiment further includes the first quantum key wavelength division multiplexer（DWDM）It is more with the second quantum key wavelength division multiplexer
Quantum key distribution system transmitting terminal described in road is connected with the first quantum key wavelength division multiplexer, quantum key described in multichannel point
Hair system receiving terminal is connected with the second quantum key wavelength division multiplexer, and the first quantum key wavelength division multiplexer passes through single
Optical fiber is connected with the second quantum key wavelength division multiplexer quantum communications.First optical module passes through simple optical fiber and the second optical mode
Block classical communication connects.The homologous clock module uses pll clock generator or crystal oscillator.
In the present embodiment, first protocol resolution module includes coding module and the first fifo module, the coding mould
Block is connected with quantum key distribution system transmitting terminal, and the coding module is connected with the first fifo module；The second protocol solution
Analysing module includes decoder module and the second fifo module, and the decoder module is connected with the second fifo module, the 2nd FIFO
Module is connected with quantum key distribution system receiving terminal.First protocol resolution module and second protocol parsing module not only have association
The function of parsing is discussed, also with store function, for caching the classical signals of uncertain rate.
In the present embodiment, referring to Fig. 3, the quantum key distribution system transmitting terminal includes light source, transmitting terminal quantum state system
Standby module, optical attenuator and transmitting terminal control circuit module, the light source prepare module with transmitting terminal quantum state and are connected by optical fiber
It connects, the transmitting terminal quantum state prepares module and is connected with optical attenuator by optical fiber, the optical attenuator and the first quantum key
Wavelength division multiplexer is connected by optical fiber, and the control circuit module prepares module and light decay with light source, transmitting terminal quantum state respectively
Subtract device electrical connection, the control circuit module is electrically connected with the first protocol resolution module.Wherein transmitting terminal quantum state prepares module
It is prepared with quantum state（I.e. quantum state changes）Function, may be employed in the quantum key distribution system transmitting terminal of the prior art
The structure that portion changes quantum state realizes prepared by quantum state.Specifically, transmitting terminal control circuit module triggering light source generates multi-photon,
Module is prepared by transmitting terminal quantum state, by key information loading on photon, light source is decayed into single photon rank before sending,
The single photon for being loaded with key information enters quantum channel.
In the present embodiment, referring to Fig. 4, the quantum key distribution system receiving terminal include receiving terminal control circuit module,
Receiving terminal quantum state prepares module and single-photon detector, the receiving terminal control circuit module respectively with receiving terminal quantum state system
Standby module and single-photon detector are electrically connected, and the receiving terminal control circuit module is electrically connected with second protocol parsing module.Its
Middle receiving terminal quantum state prepares module and is prepared with quantum state（I.e. quantum state changes）Function, the amount of the prior art may be employed
Change the structure of quantum state inside quantum key distribution system receiving terminal（Receiving terminal quantum state, which prepares module, may include Polarization Control
Device, circulator, polarization beam apparatus and phase-modulator etc.）Realize prepared by quantum state.Receiving terminal receives photon from quantum channel,
It initially enters receiving terminal quantum state and prepares module（Receiving terminal quantum state, which prepares module, may include Polarization Controller, circulator, polarization
Beam splitter and phase-modulator etc.）Decoding, enters back into single-photon detector, single-photon detector responds single photon and exports electricity
Signal output is learned to initiate in classical channel to base and post processing to receiving terminal control circuit module, then by receiving terminal.
The real work flow of the above-mentioned sychronisation for multichannel quantum key distribution system is：Transmitting terminal makes during operation
Quantum state preparation is carried out with homologous clock；Multichannel quantum key distribution system transmitting terminal passes through wavelength-division multiplex quantum channel traffic volume
Sub-light；Classical information is sent to the first protocol resolution module, the function on the one hand coding module in the first protocol resolution module
For classical information is added header（The process encoded by coding module）So which receiving terminal can tell
The data that transmitting terminal is sent, another aspect the first fifo module caching multichannel classical signals（First fifo module has caching number
According to function）So that classical signals are by presetting speed rates；Multichannel classical information is with synchronizing signal in the first protocol analysis mould
It is sent after merging in block by the first optical module；After receiving terminal receives classical information, pass through second protocol parsing module
Interior decoder module removes header（The process being decoded by decoder module）, classical information is sent to corresponding each
Road quantum key distribution system receiving terminal.After receiving terminal receives synchronizing signal, each road quantum key distribution system receiving terminal makes
Quantum state is carried out with synchronised clock to prepare and quantum state detection；
For the synchronizing process of the sychronisation of multichannel quantum key distribution system, comprise the following steps：
Step 1：Quantum key distribution system transmitting terminal described in multichannel carries out quantum state by homologous clock module and prepares simultaneously
By quantum key distribution system receiving terminal described in quantum channel traffic volume sub-light to multichannel；
Step 2:Quantum key distribution system transmitting terminal described in multichannel by homologous clock module send synchronizing signal and
For multichannel classical signals to the first protocol resolution module, the coding module in the first protocol resolution module distinguishes multichannel classical signals
Add the first fifo module caching multichannel classical signals in header information and the first protocol resolution module；
Step 3：Multichannel classical signals according to the transmission frequency of synchronizing signal and are passed through first by the first protocol resolution module
Optical module driving unit is sent to the first optical module, and multichannel classical signals and synchronizing signal are converted to light by first optical module
Signal simultaneously passes through simple optical fiber and is sent to the second optical module；
Step 4：The optical signal of reception is converted to multichannel classical signals and synchronizing signal and passed through by second optical module
Second optical module driving unit is sent to second protocol parsing module, and the decoder module in second protocol parsing module removes multichannel
The second fifo module caching multichannel classical signals in header information and second protocol parsing module in classical signals, the second association
It discusses parsing module and multichannel classical signals and synchronizing signal is sent to corresponding multichannel according to the header information in multichannel classical information
Quantum key distribution system receiving terminal, quantum key distribution system receiving terminal described in multichannel is according to the multichannel classical signals received
Quantum state preparation and quantum state are carried out to the quantum light that quantum key distribution system transmitting terminal described in multichannel is sent with synchronizing signal
Detection.Prepared by quantum state and the quantum state preparation of the prior art and quantum state detection method can be used in quantum state detection.
The utility model parallel in use, can be by all synchronizing signals and classics for covering quantum-key distribution equipment more
Signal merges transmission；More set quantum key distribution system transmitting terminals use same clock source so that can only use synchronous all the way
It is run simultaneously even if signal much covers quantum key distribution equipment.
The scope of protection of the utility model includes but not limited to embodiment of above, and the scope of protection of the utility model is to weigh
Subject to sharp claim, any replacement being readily apparent that those skilled in the art that this technology is made, deformation, improvement are each fallen within
The scope of protection of the utility model.
Claims (7)
1. a kind of sychronisation for multichannel quantum key distribution system, including transmitting terminal and receiving terminal, it is characterised in that：Institute
Stating transmitting terminal includes homologous clock module, multichannel quantum key distribution system transmitting terminal, the first protocol resolution module, the first optical mode
Block driving unit and the first optical module, the receiving terminal include the second optical module, the second optical module driving unit, second protocol solution
Analyse module and multichannel quantum key distribution system receiving terminal；
The homologous clock module is connected with quantum key distribution system transmitting terminal described in multichannel, quantum key distribution described in multichannel
System transmitting terminal is connected with quantum key distribution system receiving terminal quantum communications described in multichannel, quantum key distribution system described in multichannel
System transmitting terminal is electrically connected with the first protocol resolution module, and first protocol resolution module is electrically connected with the first optical module driving unit
It connects, the first optical module driving unit is electrically connected with the first optical module, and first optical module and the second optical module are classical logical
Letter connection, second optical module are electrically connected with the second optical module driving unit, the second optical module driving unit and second
Protocol resolution module is electrically connected, and the second protocol parsing module is electrically connected with quantum key distribution system receiving terminal described in multichannel
It connects.
2. the sychronisation according to claim 1 for multichannel quantum key distribution system, it is characterised in that：It further includes
First quantum key wavelength division multiplexer and the second quantum key wavelength division multiplexer, quantum key distribution system transmitting terminal described in multichannel
Be connected with the first quantum key wavelength division multiplexer, quantum key distribution system receiving terminal described in multichannel with the second quantum key
Wavelength division multiplexer connects, and the first quantum key wavelength division multiplexer passes through simple optical fiber and the second quantum key wavelength division multiplexer
Quantum communications connect.
3. the sychronisation according to claim 2 for multichannel quantum key distribution system, it is characterised in that：Described
One optical module is connected by simple optical fiber with the second optical module classical communication.
4. the sychronisation according to claim 1 for multichannel quantum key distribution system, it is characterised in that：It is described same
Source clock module uses pll clock generator or crystal oscillator.
5. the sychronisation according to claim 2 for multichannel quantum key distribution system, it is characterised in that：Described
One protocol resolution module includes coding module and the first fifo module, the coding module and quantum key distribution system transmitting terminal
Connection, the coding module are connected with the first fifo module；The second protocol parsing module includes decoder module and second
Fifo module, the decoder module are connected with the second fifo module, and second fifo module connects with quantum key distribution system
Receiving end connects.
6. the sychronisation according to claim 5 for multichannel quantum key distribution system, it is characterised in that：The amount
Quantum key distribution system transmitting terminal includes light source, transmitting terminal quantum state prepares module, optical attenuator and transmitting terminal control circuit mould
Block, the light source prepare module with transmitting terminal quantum state and are connected by optical fiber, and the transmitting terminal quantum state prepares module and light decay
Subtract device to connect by optical fiber, the optical attenuator is connected with the first quantum key wavelength division multiplexer by optical fiber, the control electricity
Road module prepares module with light source, transmitting terminal quantum state respectively and optical attenuator is electrically connected, the control circuit module and first
Protocol resolution module is electrically connected.
7. the sychronisation according to claim 6 for multichannel quantum key distribution system, it is characterised in that：The amount
Quantum key distribution system receiving terminal includes receiving terminal control circuit module, receiving terminal quantum state prepares module and single photon detection
Device, the receiving terminal control circuit module prepares module with receiving terminal quantum state respectively and single-photon detector is electrically connected, described
Receiving terminal control circuit module is electrically connected with second protocol parsing module.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107579820A (en) * | 2017-09-20 | 2018-01-12 | 安徽问天量子科技股份有限公司 | Sychronisation and synchronous method for multichannel quantum key distribution system |
| CN111555871A (en) * | 2020-04-29 | 2020-08-18 | 中国科学院半导体研究所 | Reconfigurable receiving chip for quantum key distribution |
| CN112491780A (en) * | 2019-09-12 | 2021-03-12 | 通用电气公司 | Communication system and method |
-
2017
- 2017-09-20 CN CN201721204512.5U patent/CN207442862U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107579820A (en) * | 2017-09-20 | 2018-01-12 | 安徽问天量子科技股份有限公司 | Sychronisation and synchronous method for multichannel quantum key distribution system |
| CN112491780A (en) * | 2019-09-12 | 2021-03-12 | 通用电气公司 | Communication system and method |
| CN112491780B (en) * | 2019-09-12 | 2024-04-19 | 通用电气技术有限公司 | Communication system and method |
| CN111555871A (en) * | 2020-04-29 | 2020-08-18 | 中国科学院半导体研究所 | Reconfigurable receiving chip for quantum key distribution |
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