CN109818740A - A kind of uplink continuous variable quantum key distribution access network method using wavelength division multiplexer - Google Patents
A kind of uplink continuous variable quantum key distribution access network method using wavelength division multiplexer Download PDFInfo
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- CN109818740A CN109818740A CN201910066340.7A CN201910066340A CN109818740A CN 109818740 A CN109818740 A CN 109818740A CN 201910066340 A CN201910066340 A CN 201910066340A CN 109818740 A CN109818740 A CN 109818740A
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Abstract
The present invention provides a kind of uplink continuous variable quantum key distributions using wavelength division multiplexer to access network method.In the program, user terminal generates the continuous variable quantum signal of uplink using continuous variable quantum key distribution transmitting terminal, continuous variable quantum signal enters wavelength division multiplexer after being transmitted through the fiber to timing_delay estimation module, output is transmitted to end continuous variable quantum key distribution receiving end by optical fiber, and continuous variable quantum key distribution receiving end measures continuous variable quantum signal using zero-difference detection or heterodyne detection and carries out cipher key extraction step to extract 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 continuous with the uplink of wavelength division multiplexer
Variable quantum key distribution 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.Wavelength-division multiplex technique can make the signal of different wave length simultaneous transmission in simple optical fiber, can greatly improve light
Fine transmission quantity, is the important technology in next-generation optical-fiber network.Based on the quantum access network technology of discrete variable agreement there are still
Detector is with high costs and detection efficient more low the problem of being unfavorable for large-scale application under room temperature.Therefore still anxious at present
Need it is a kind of may be implemented quantum key distribution to family access network method.
Summary of the invention
A kind of uplink continuous variable quantum key distribution using wavelength division multiplexer of invention accesses network method, this
Invention is avoided using single-photon detector, by all using the component of high commercialization degree, realizing point of quantum key
It is dealt into family, greatly reduces the cost of quantum 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 the continuous variable quantum signal of n wavelength respectively.
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: for the road the n continuous variable quantum signal light and local oscillator light by calibration by wavelength division multiplexer, exporting is one
Road 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:
It is the laser of λ 1 to λ n, wavelength X 1 to λ n not phase that n continuous variable quantum communications transmitting terminal uses wavelength respectively
Together, wavelength X 1 to λ n range is 1528.77nm to 1560.61nm.
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.N time delay module changes continuous variable quantum signal by adjusting time delay
Into the time of wavelength-division multiplex, guarantee the non-overlapping entrance wavelength division multiplexer 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 one
A continuous variable quantum key distribution receiving end sends key.
2.n continuous variable quantum key distribution transmitting terminal selects wavelength for λ 1 to the laser of λ n respectively, wherein wavelength X
1 is identical to λ n, and wavelength X 1 to λ n wavelength selection range is 1528.77nm to 1560.61nm.
3.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.
4. 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.
5. 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.
6. 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 continuous variable quantum key uplink provided by the invention distribution access network method can
To avoid realizing many-to-one uplink quantum access network architecture using single-photon detector and at room temperature.It mentions significantly
The high 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 (6)
1. a kind of uplink continuous variable quantum key distribution using wavelength division multiplexer accesses network method, which is characterized in that including
Following steps:
1:n continuous variable quantum key distribution transmitting terminal of step generates the continuous variable quantum signal of n wavelength respectively；
The road step 2:n continuous variable quantum signal and local oscillator light pass through timing_delay estimation modular calibration continuous variable quantum signal respectively
Reach the time of wavelength division multiplexer；
Step 3: the road n continuous variable quantum signal light and local oscillator light by calibration are exported by wavelength division multiplexer to believe all the way
Number 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 access net using wavelength division multiplexer according to claim 1
Method, which is characterized in that in step 1, it is the laser of λ 1 to λ n that n continuous variable quantum communications transmitting terminal uses wavelength respectively
Device, wavelength X 1 is not identical to λ n, and wavelength X 1 to λ n range is 1528.77nm to 1560.61nm.
3. a kind of uplink continuous variable quantum key distribution access net using wavelength division multiplexer according to claim 1
Method, which is characterized in that n continuous variable quantum communications transmitting terminal passes through laser or laser and intensity first in step 1
Modulator prepares pulse signal, and pulse signal then passes through beam splitter and pulse signal is divided into signal light and local oscillator light, wherein believing
Number light is modulated quantum state by intensity modulator and phase-modulator, and by attenuator by quantum signal optical attenuation system
Standby continuous variable quantum signal pulse, then by polarized composite wave device and local oscillator optical coupling, and is sent to timing_delay estimation module.
4. a kind of uplink continuous variable quantum key distribution access net using wavelength division multiplexer according to claim 1
Method, which is characterized in that the continuous variable quantum signal and local oscillator light that continuous variable quantum key distribution transmitting terminal generates pass through
Optical fiber is transmitted to timing_delay estimation module.
5. a kind of uplink continuous variable quantum key distribution access net using wavelength division multiplexer according to claim 1
Method, which is characterized in that timing_delay estimation module described in step 2 is delay line, guarantees that the road n continuously becomes by adjusting time delay module
Measure the non-overlapping entrance wavelength division multiplexer of quantum signal.
6. a kind of uplink continuous variable quantum key distribution access net using wavelength division multiplexer according to claim 1
Method, which is characterized in that in step 4, continuous variable quantum distributes receiving end by zero-difference detection or heterodyne detection mode to even
Continuous variable quantum signal is detected, and carries out cipher key extraction step to extract key.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106130943A (en) * | 2016-06-02 | 2016-11-16 | 上海交通大学 | A kind of continuous variable quantum key distribution system collecting method and system |
| CN207625570U (en) * | 2017-12-29 | 2018-07-17 | 华南师范大学 | A kind of automatic synchronizing apparatus of the unrelated quantum key distribution system of measuring apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106130943A (en) * | 2016-06-02 | 2016-11-16 | 上海交通大学 | A kind of continuous variable quantum key distribution system collecting method and system |
| CN207625570U (en) * | 2017-12-29 | 2018-07-17 | 华南师范大学 | A kind of automatic synchronizing apparatus of the unrelated quantum key distribution system of measuring apparatus |
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