CN109039606A - Same frequency sampling method and circuit in continuous variable quantum key distribution system - Google Patents
Same frequency sampling method and circuit in continuous variable quantum key distribution system Download PDFInfo
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- CN109039606A CN109039606A CN201810963306.5A CN201810963306A CN109039606A CN 109039606 A CN109039606 A CN 109039606A CN 201810963306 A CN201810963306 A CN 201810963306A CN 109039606 A CN109039606 A CN 109039606A
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- 238000005070 sampling Methods 0.000 title claims abstract description 64
- 238000009826 distribution Methods 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000003287 optical effect Effects 0.000 claims abstract description 14
- 238000003860 storage Methods 0.000 claims abstract description 10
- 238000013480 data collection Methods 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 5
- 230000006870 function Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
- H04L9/0816—Key establishment, i.e. cryptographic processes or cryptographic protocols whereby a shared secret becomes available to two or more parties, for subsequent use
- H04L9/0852—Quantum cryptography
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- Electromagnetism (AREA)
- Theoretical Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
Abstract
The present invention provides the same frequency sampling methods and circuit in a kind of continuous variable quantum key distribution system, comprising: samples to the data in optical path, obtains one section of sampled data；Calculate the average value of sampled data, the average value stored and corresponding sampled point；Sampling phase when to data sampling is adjusted；It so repeats, number of repetition=individual data period/DPS minimum adjusts granularity；The average value for comparing each sampled point of storage, taking the corresponding sampled point of maximum average value is final sampled point, and adjustment sampling phase is the corresponding sampling phase of final sampled point.It is of the invention with frequency sampling mode compared with traditional over-sampling mode, under identical clock frequency, data rate is significantly increased, and then increases the key production rate of entire continuous variable distribution of quantum key system.
Description
Technical field
The present invention relates to quantum communications fields, and in particular, to the same frequency in continuous variable quantum key distribution system is adopted
Quadrat method and circuit.
Background technique
It in continuous quantum key distribution equipment, needs to sample the analog quantity in optical path, and is accurately sampled
Premise be determining optimum sampling point (i.e. peak value sampling point).Oversampler method is mostly used in the industry, when data rate must compare
Clock frequency is 50 times low or more just preferable sample effect, influences final key rate.
Oversampler method is that low frequency signal is sampled using high frequency clock, twice of frequency difference or more.As shown in Figure 1, it is assumed that simulation
One data duty cycle of channel has 50%, is sampled with 10 clock cycle, and the value of each periodic sampling is recorded, and takes peak value
Sampled point is as final sampled point.The defect of this mode is: in the enough situations of sampling number, peak value sampling point ability
It looks for relatively more accurate, in the case where duty ratio only has 10%, at least can just find more accurately peak value with 50 clock cycle
Sampled point thereby reduces data rate (reducing by 50 times or more).
DPS:Dynamic Phase Shift, dynamic phasing adjustment.
Summary of the invention
For the defects in the prior art, the object of the present invention is to provide in a kind of continuous variable quantum key distribution system
Same frequency sampling method and circuit.
A kind of same frequency sampling method in continuous variable quantum key distribution system provided according to the present invention, including step
It is rapid:
S1, the data in optical path are sampled, obtains one section of sampled data；
S2, the average value for calculating sampled data, the average value stored and corresponding sampled point；
S3, to data sampling when sampling phase be adjusted；
S4, S1 to S3 is repeated, number of repetition=individual data period/DPS minimum adjusts granularity；
S5, compare storage each sampled point average value, take the corresponding sampled point of maximum average value be final sampled point,
Adjustment sampling phase is the corresponding sampling phase of final sampled point.
Preferably, the data in the optical path are periodical alternate data.
Preferably, the duty ratio of the periodicity alternate data is 10%.
Preferably, the initial phase after continuous variable quantum key distribution system re-powers executes step S1 extremely
S5。
The same frequency sampling circuit in a kind of continuous variable quantum key distribution system provided according to the present invention, comprising:
Data sampling circuit: including the first clock signal input terminal, data collection terminal and data output end, the data
Sample circuit samples the data in optical path, obtains one section of sampled data；
Mean value operating circuit: the input terminal of the mean value operating circuit connects the data output end, calculates sampling
The average value of data；
Memory: connecting the output end of the mean value operating circuit, n obtained average values of storage and corresponding adopts
Sampling point, n=individual data period/DPS minimum adjust granularity；
Comparator: the input terminal of the comparator connects the memory, compares the average value of each sampled point of storage,
Taking the corresponding sampled point of maximum average value is final sampled point；
DPS logic circuit: input terminal connects the output end of the comparator, is controlled according to the sampling phase of final sampled point
DPS device carries out sampling phase adjustment；
DPS device: input terminal includes second clock signal input part and DPS logic input terminal, the DPS logic input terminal
The output end of the DPS logic circuit is connected, the output end of the DPS device connects first clock signal input terminal.
Preferably, the data in the optical path are periodical alternate data.
Preferably, the duty ratio of the periodicity alternate data is 10%.
Preferably, the same frequency sampling circuit in the continuous variable quantum key distribution system is in continuous variable quantum key
Initialization rank after dissemination system re-powers starts.
Compared with prior art, the present invention have it is following the utility model has the advantages that
Same frequency sampling mode (using the data of the low duty ratio of the clock sampling same frequency of identical frequency) of the invention with
Traditional over-sampling mode is compared, and under identical clock frequency, data rate is significantly increased, and then increases entire continuous variable amount
The key production rate of sub- code key dissemination system.
Detailed description of the invention
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other feature of the invention,
Objects and advantages will become more apparent upon:
Fig. 1 is the schematic diagram of conventional over-sampled mode；
Fig. 2 is structural block diagram of the invention；
Fig. 3 is final sampled point schematic diagram calculation of the invention；
Fig. 4 is the circuit diagram of data sampling circuit of the invention；
Fig. 5 is the circuit diagram of mean value operating circuit of the present invention.
Specific embodiment
The present invention is described in detail combined with specific embodiments below.Following embodiment will be helpful to the technology of this field
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill of this field
For personnel, without departing from the inventive concept of the premise, several changes and improvements can also be made.These belong to the present invention
Protection scope.
A kind of same frequency sampling method in continuous variable quantum key distribution system provided according to the present invention, including step
It is rapid:
S1, the data in optical path are sampled, obtains one section of sampled data；
S2, the average value for calculating sampled data, the average value stored and corresponding sampled point；
S3, to data sampling when sampling phase be adjusted；
S4, S1 to S3 is repeated, number of repetition=individual data period/DPS minimum adjusts granularity；
S5, compare storage each sampled point average value, take the corresponding sampled point of maximum average value be final sampled point,
Adjustment sampling phase is the corresponding sampling phase of final sampled point.
In the present embodiment, the data in optical path are the periodical alternate data that duty ratio is 10%, but the present invention is to this
With no restriction.
Initial phase of the present invention after continuous variable quantum key distribution system re-powers executes step S1 extremely
S5 does not need to compute repeatedly final sampled point in normal course of operation.
As shown in Fig. 2, the same frequency sampling electricity in a kind of continuous variable quantum key distribution system provided according to the present invention
Road, comprising:
Data sampling circuit: including the first clock signal input terminal, data collection terminal and data output end, the data
Sample circuit samples the data in optical path, obtains one section of sampled data；
Mean value operating circuit: the input terminal of the mean value operating circuit connects the data output end, calculates sampling
The average value of data；
Memory: connecting the output end of the mean value operating circuit, n obtained average values of storage and corresponding adopts
Sampling point, n=individual data period/DPS minimum adjust granularity；
Comparator: the input terminal of the comparator connects the memory, compares the average value of each sampled point of storage,
Taking the corresponding sampled point of maximum average value is final sampled point；
DPS logic circuit: input terminal connects the output end of the comparator, is controlled according to the sampling phase of final sampled point
DPS device carries out sampling phase adjustment；
DPS device: input terminal includes second clock signal input part and DPS logic input terminal, the DPS logic input terminal
The output end of the DPS logic circuit is connected, the output end of the DPS device connects first clock signal input terminal.
Wherein, data sampling circuit, mean value operating circuit, memory, comparator, DPS logic circuit even DPS device
Part can also realize that memory is using in FPGA other than hardware, circuit (as shown in Figure 4, Figure 5) by FPGA
Register.
In the present embodiment, the data in optical path are the periodical alternate data that duty ratio is 10%, but the present invention is to this
With no restriction.
Same frequency sampling circuit in continuous variable quantum key distribution system of the present invention is in continuous variable quantum key distribution
Initialization rank after system re-powers starts, and does not need to compute repeatedly final sampled point in normal course of operation.
As shown in figure 3, carrying out operating operation test through the invention, the numerical value that third sampling phase is adopted is maximum, therefore for most
Good sampling phase.
One skilled in the art will appreciate that in addition to realizing system provided by the invention in a manner of pure computer readable program code
It, completely can be by the way that method and step be carried out programming in logic come so that the present invention provides and its other than each device, module, unit
System and its each device, module, unit with logic gate, switch, specific integrated circuit, programmable logic controller (PLC) and embedding
Enter the form of the controller that declines etc. to realize identical function.So system provided by the invention and its every device, module, list
Member is considered a kind of hardware component, and to include in it can also for realizing the device of various functions, module, unit
To be considered as the structure in hardware component；It can also will be considered as realizing the device of various functions, module, unit either real
The software module of existing method can be the structure in hardware component again.
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited to above-mentioned
Particular implementation, those skilled in the art can make a variety of changes or modify within the scope of the claims, this not shadow
Ring substantive content of the invention.In the absence of conflict, the feature in embodiments herein and embodiment can any phase
Mutually combination.
Claims (8)
1. a kind of same frequency sampling method in continuous variable quantum key distribution system, which is characterized in that comprising steps of
S1, the data in optical path are sampled, obtains one section of sampled data；
S2, the average value for calculating sampled data, the average value stored and corresponding sampled point；
S3, to data sampling when sampling phase be adjusted；
S4, S1 to S3 is repeated, number of repetition=individual data period/DPS minimum adjusts granularity；
S5, compare storage each sampled point average value, take the corresponding sampled point of maximum average value be final sampled point, adjustment
Sampling phase is the corresponding sampling phase of final sampled point.
2. the same frequency sampling method in continuous variable quantum key distribution system according to claim 1, which is characterized in that
Data in the optical path are periodical alternate data.
3. the same frequency sampling method in continuous variable quantum key distribution system according to claim 2, which is characterized in that
The duty ratio of the periodicity alternate data is 10%.
4. the same frequency sampling method in continuous variable quantum key distribution system according to claim 1, which is characterized in that
Initial phase after continuous variable quantum key distribution system re-powers executes step S1 to S5.
5. the same frequency sampling circuit in a kind of continuous variable quantum key distribution system characterized by comprising
Data sampling circuit: including the first clock signal input terminal, data collection terminal and data output end, the data sampling
Circuit samples the data in optical path, obtains one section of sampled data；
Mean value operating circuit: the input terminal of the mean value operating circuit connects the data output end, calculates sampled data
Average value；
Memory: the output end of the mean value operating circuit, n obtained average values of storage and corresponding sampling are connected
Point, n=individual data period/DPS minimum adjust granularity；
Comparator: the input terminal of the comparator connects the memory, compares the average value of each sampled point of storage, takes most
The big corresponding sampled point of average value is final sampled point；
DPS logic circuit: input terminal connects the output end of the comparator, controls DPS according to the sampling phase of final sampled point
Device carries out sampling phase adjustment；
DPS device: input terminal includes second clock signal input part and DPS logic input terminal, the DPS logic input terminal connection
The output end of the output end of the DPS logic circuit, the DPS device connects first clock signal input terminal.
6. the same frequency sampling circuit in continuous variable quantum key distribution system according to claim 5, which is characterized in that
Data in the optical path are periodical alternate data.
7. the same frequency sampling circuit in continuous variable quantum key distribution system according to claim 6, which is characterized in that
The duty ratio of the periodicity alternate data is 10%.
8. the same frequency sampling circuit in continuous variable quantum key distribution system according to claim 5, which is characterized in that
Same frequency sampling circuit in the continuous variable quantum key distribution system continuous variable quantum key distribution system again on
Initialization rank starting after electricity.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810963306.5A CN109039606A (en) | 2018-08-22 | 2018-08-22 | Same frequency sampling method and circuit in continuous variable quantum key distribution system |
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| CN201810963306.5A CN109039606A (en) | 2018-08-22 | 2018-08-22 | Same frequency sampling method and circuit in continuous variable quantum key distribution system |
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| CN109039606A true CN109039606A (en) | 2018-12-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110430250A (en) * | 2019-07-25 | 2019-11-08 | 河北信通网络信息技术有限公司 | A kind of propulsion management method, storage medium and the device of Project of Computer System Integration |
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| US5990968A (en) * | 1995-07-27 | 1999-11-23 | Hitachi, Ltd. | Video signal processing device for automatically adjusting phase of sampling clocks |
| JP2002278495A (en) * | 2001-03-16 | 2002-09-27 | Fujitsu General Ltd | Sampling phase adjusting circuit |
| CN101299657A (en) * | 2008-06-26 | 2008-11-05 | 上海交通大学 | Symbol timing synchronizing apparatus for complete digital receiver |
| CN108337086A (en) * | 2018-02-02 | 2018-07-27 | 北京邮电大学 | A kind of Phase synchronization method of sampling the point-score system suitable for quantum key |
| CN208768083U (en) * | 2018-08-22 | 2019-04-19 | 上海循态信息科技有限公司 | Same frequency sampling circuit in continuous variable quantum key distribution system |
-
2018
- 2018-08-22 CN CN201810963306.5A patent/CN109039606A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5990968A (en) * | 1995-07-27 | 1999-11-23 | Hitachi, Ltd. | Video signal processing device for automatically adjusting phase of sampling clocks |
| JP2002278495A (en) * | 2001-03-16 | 2002-09-27 | Fujitsu General Ltd | Sampling phase adjusting circuit |
| CN101299657A (en) * | 2008-06-26 | 2008-11-05 | 上海交通大学 | Symbol timing synchronizing apparatus for complete digital receiver |
| CN108337086A (en) * | 2018-02-02 | 2018-07-27 | 北京邮电大学 | A kind of Phase synchronization method of sampling the point-score system suitable for quantum key |
| CN208768083U (en) * | 2018-08-22 | 2019-04-19 | 上海循态信息科技有限公司 | Same frequency sampling circuit in continuous variable quantum key distribution system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110430250A (en) * | 2019-07-25 | 2019-11-08 | 河北信通网络信息技术有限公司 | A kind of propulsion management method, storage medium and the device of Project of Computer System Integration |
| CN110430250B (en) * | 2019-07-25 | 2022-04-05 | 河北信通网络信息技术有限公司 | Computer system integrated push project management method, storage medium and device |
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Address after: 200241 room 1139, building C, No. 555, Dongchuan Road, Minhang District, Shanghai Applicant after: Shanghai circulation Quantum Technology Co.,Ltd. Address before: 200241 room 1139, building C, No. 555, Dongchuan Road, Minhang District, Shanghai Applicant before: SHANGHAI XUNTAI INFORMATION TECHNOLOGY CO.,LTD. |
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Application publication date: 20181218 |
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