CN109861814A - A kind of uplink continuous variable quantum key distribution access network method using optical splitter - Google Patents
A kind of uplink continuous variable quantum key distribution access network method using optical splitter Download PDFInfo
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- CN109861814A CN109861814A CN201910066223.0A CN201910066223A CN109861814A CN 109861814 A CN109861814 A CN 109861814A CN 201910066223 A CN201910066223 A CN 201910066223A CN 109861814 A CN109861814 A CN 109861814A
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Abstract
The present invention provides a kind of continuous variable quantum key distributions using optical splitter to access network method.In the program, a plurality of clients generate the continuous variable quantum signal of uplink using continuous variable quantum key distribution transmitting terminal, continuous variable quantum signal is transmitted through the fiber to end continuous variable quantum key distribution receiving end after being transmitted through the fiber to optical splitter, and continuous variable quantum key distribution receiving end, which measures the signal received using zero-difference detection or heterodyne detection and carries out cipher key extraction step, extracts key.The program realizes the continuous variable quantum key distribution access net at multi-user end, has the features such as high code rate, low cost, Yi Shixian.It lays a good foundation for extensive practical quantum network construction.
Description
Technical field
The present invention designs continuous variable quantum key distribution field, and in particular to a kind of uplink with optical splitter continuously becomes
It measures quantum key distribution and accesses network method.
Background technique
Continuous variable quantum key distribution theory α coefficient proves continuous variable quantum key distribution technical application
It lays a good foundation.Currently, multiple countries are to carry out the experiment of continuous variable quantum key distribution, continuous variable quantum key distribution
Technology just quickly steps into the application stage.Connection of the net as backbone network and user terminal is accessed, weight is occupied in network construction
The position wanted.It is with high costs there are still detector based on the quantum access network technology of discrete variable agreement and under room temperature detect
Efficiency more low the problem of being unfavorable for large-scale application.Therefore being still badly in need of one kind may be implemented quantum key distribution to family at present
Access network method.
Summary of the invention
Invention a kind of access network method of continuous variable quantum key distribution, the present invention are avoided using single photon
Detector, by the way that all using the component of high commercialization degree, realize quantum key is distributed to family, the amount of greatly reducing
The cost of sub- access network construction improves the feasibility of large scale quantities sub-network construction.
The present invention includes four steps:
1:n continuous variable quantum key distribution transmitting terminal of step generates uplink continuous variable quantum signal；
The road step 2:n continuous variable quantum signal and local oscillator light pass through timing_delay estimation modular calibration continuous variable quantum respectively
The time of signal arrival optical splitter；
Step 3: the road n continuous variable quantum signal light and local oscillator light by calibration are exported by optical splitter as all the way
Signal is simultaneously transmitted to continuous variable quantum key distribution receiving end by optical fiber；
Step 4: continuous variable quantum key distribution receiving end detects continuous variable quantum signal and carries out key
It extracts.
For the technical essential described in step 1, it is described as follows:
N continuous variable quantum communications transmitting terminal passes through laser or laser and intensity modulator preparation pulse letter first
Number, pulse signal is then divided by signal light and local oscillator light by beam splitter, wherein signal light passes through intensity modulator and phase
Modulator is modulated quantum state, and quantum signal optical attenuation is prepared the pulse of continuous variable quantum signal by attenuator,
Then by polarized composite wave device and local oscillator optical coupling, and it is sent to timing_delay estimation module.
For the technical essential described in step 2, it is described as follows:
The continuous variable quantum signal and local oscillator light that continuous variable quantum key distribution transmitting terminal produces are transmitted through the fiber to
Timing_delay estimation module, timing_delay estimation module are delay line.Time delay module by adjusting time delay change continuous variable quantum signal into
Enter the time of optical splitter, guarantees the non-overlapping entrance optical splitter of the road n continuous variable quantum signal.
For the technical essential described in step 4, it is described as follows:
Continuous variable quantum communications receiving end by zero-difference detection or heterodyne detection mode to continuous variable quantum signal into
Row detection, and carry out cipher key extraction step and obtain key.
The present invention provides multiple continuous variable quantum key distribution transmitting terminals and a continuous variable quantum key distribution
The dispositions method of receiving end realizes many-to-one quantum access network architecture.The present invention using mature commercialization component and
The detector of high detection efficient realizes high code rate, low cost, the access network architecture easily implemented.For extensive practical quantum network
Construction is laid a good foundation.
Detailed description of the invention
Fig. 1 is simplified continuous variable quantum key distribution transmitting terminal schematic diagram
Fig. 2 is structural schematic diagram of the invention
Specific embodiment
Specific embodiments of the present invention are made below according to attached drawing and being illustrated:
Referring to fig. 2, a kind of uplink continuous variable quantum key distribution using optical splitter accesses network method, including following
Steps are as follows:
1. accessing net uses uplink structure, i.e. n user terminal passes through continuous variable quantum key distribution transmitting terminal to net
Network node side continuous variable quantum key distribution receiving end sends key.
2.n continuous variable quantum key distribution transmitting terminal, referring to Fig. 1, continuous variable quantum key distribution transmitting terminal is first
It first passes through laser or laser and intensity modulator prepares pulse signal, pulse signal is then divided by signal by beam splitter
Light and local oscillator light, wherein signal light is modulated quantum state by intensity modulator and phase-modulator, and passes through attenuator
Quantum signal optical attenuation is prepared into the pulse of continuous variable quantum signal, then by polarized composite wave device and local oscillator optical coupling, concurrently
It send to timing_delay estimation module.
3. the continuous variable quantum signal that the preparation of continuous variable quantum key distribution transmitting terminal is completed passes through time delay module,
Time delay module is delay line in middle example, and time delay module becomes the road n continuously by adjusting the time delay of continuous variable quantum signal
Amount quantum signal distinguishes non-overlapping entrance optical splitter.
4. the continuous variable quantum signal pulse Jing Guo time delay module is transmitted through the fiber to optical splitter, optical splitter is defeated
Signal is transmitted to continuous variable quantum key distribution receiving end by optical fiber all the way out.
5. continuous variable quantum communications receiving end by zero-difference detection or heterodyne detection mode to continuous variable quantum signal into
Row detection, and carry out cipher key extraction step and obtain key.
By above example as can be seen that the method for continuous variable quantum key distribution provided by the invention access net can be with
It is avoiding realizing many-to-one uplink quantum access network architecture using single-photon detector and at room temperature.It greatly improves
The feasibility of quantum network construction.
It is discussed in detail although the contents of the present invention have passed through above preferred embodiment, but it should be appreciated that above-mentioned
Description is not considered as limitation of the present invention.After those skilled in the art have read above content, for of the invention
A variety of modifications and substitutions all will be apparent.Therefore, protection of the invention, which is enclosed, to be limited to the appended claims.
Claims (5)
1. a kind of uplink continuous variable quantum key distribution using optical splitter accesses network method, which is characterized in that including with
Lower step:
1:n continuous variable quantum key distribution transmitting terminal of step generates uplink continuous variable quantum signal；
The road step 2:n continuous variable quantum signal and local oscillator light are reached by timing_delay estimation modular calibration continuous variable quantum signal
The time of optical splitter；
Step 3: the road n continuous variable quantum signal light and local oscillator light by calibration are exported by optical splitter as signal all the way
And continuous variable quantum key distribution receiving end is transmitted to by optical fiber；
Step 4: continuous variable quantum key distribution receiving end detects continuous variable quantum signal and carries out cipher key-extraction.
2. a kind of uplink continuous variable quantum key distribution using optical splitter according to claim 1 accesses net side
Method, which is characterized in that n continuous variable quantum communications transmitting terminal passes through laser or laser and intensity tune first in step 1
Device processed prepares pulse signal, and pulse signal is then divided into signal light and local oscillator light by beam splitter, and wherein signal light passes through strong
Degree modulator and phase-modulator are modulated quantum state, and quantum signal optical attenuation is prepared continuous variable by attenuator
Quantum signal pulse then by polarized composite wave device and local oscillator optical coupling, and is sent to timing_delay estimation module.
3. a kind of uplink continuous variable quantum key distribution using optical splitter according to claim 1 accesses net side
Method, which is characterized in that the continuous variable quantum signal and local oscillator light that continuous variable quantum key distribution transmitting terminal produces pass through optical fiber
It is transmitted to timing_delay estimation module.
4. a kind of uplink continuous variable quantum key distribution using optical splitter according to claim 1 accesses net side
Method, which is characterized in that timing_delay estimation module described in step 2 is delay line, guarantees that the road n continuous variable quantum signal is non-overlapping
Into optical splitter.
5. a kind of uplink continuous variable quantum key distribution using optical splitter according to claim 1 accesses net side
Method, which is characterized in that in step 4, continuous variable quantum distributes receiving end by zero-difference detection or heterodyne detection mode to continuous
Variable quantum signal is detected, and carries out cipher key extraction step to extract key.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910066223.0A CN109861814A (en) | 2019-01-24 | 2019-01-24 | A kind of uplink continuous variable quantum key distribution access network method using optical splitter |
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| CN201910066223.0A CN109861814A (en) | 2019-01-24 | 2019-01-24 | A kind of uplink continuous variable quantum key distribution access network method using optical splitter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111786784A (en) * | 2020-07-10 | 2020-10-16 | 北京邮电大学 | Method for distributing and accessing uplink continuous variable quantum key |
| CN112073180A (en) * | 2020-07-30 | 2020-12-11 | 北京邮电大学 | QKD network deployed in metropolitan area network and access network and key distribution method thereof |
| CN115296748A (en) * | 2022-07-14 | 2022-11-04 | 武汉光谷信息光电子创新中心有限公司 | Polarization modulator and quantum key distribution system |
-
2019
- 2019-01-24 CN CN201910066223.0A patent/CN109861814A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111786784A (en) * | 2020-07-10 | 2020-10-16 | 北京邮电大学 | Method for distributing and accessing uplink continuous variable quantum key |
| CN112073180A (en) * | 2020-07-30 | 2020-12-11 | 北京邮电大学 | QKD network deployed in metropolitan area network and access network and key distribution method thereof |
| CN112073180B (en) * | 2020-07-30 | 2022-02-11 | 北京邮电大学 | QKD network deployed in metropolitan area network and access network and key distribution method thereof |
| CN115296748A (en) * | 2022-07-14 | 2022-11-04 | 武汉光谷信息光电子创新中心有限公司 | Polarization modulator and quantum key distribution system |
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Application publication date: 20190607 |