CN109905240A - Optical fiber quantum key distribution system and method and device for improving quantum key generation rate - Google Patents
Optical fiber quantum key distribution system and method and device for improving quantum key generation rate Download PDFInfo
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Abstract
本发明公开了一种光纤量子密钥分发系统及提升量子密钥生成率的方法、装置，提升量子密钥生成率的方法包括：获取量子密钥生成率，量子密钥生成率为单位时间内产生的量子密钥比特数；判断量子密钥生成率是否小于预设值；当量子密钥生成率小于预设值时，判断量子密钥生成率小于预设值是否是由传输光纤的色散引起，若是由传输光纤的色散导致的，则进行光纤色散补偿。通过对由光纤的色散过大导致量子密钥生成率过低的光纤量子密钥分发系统进行光纤色散补偿，可以将由于长距离的光纤色散导致展宽的量子脉冲重新压缩，使量子脉冲拥有较窄的脉宽和较高的峰值功率，从而能够达到探测器的触发门限，从而可以提升光纤量子密钥分发系统最终密钥生成率。
The invention discloses an optical fiber quantum key distribution system and a method and device for improving the quantum key generation rate. The method for improving the quantum key generation rate includes: obtaining the quantum key generation rate, and the quantum key generation rate is per unit time. The number of quantum key bits generated; determine whether the quantum key generation rate is less than the preset value; when the quantum key generation rate is less than the preset value, determine whether the quantum key generation rate less than the preset value is caused by the dispersion of the transmission fiber , if it is caused by the dispersion of the transmission fiber, the fiber dispersion compensation is performed. By performing fiber dispersion compensation on the fiber quantum key distribution system whose quantum key generation rate is too low due to the excessive dispersion of the fiber, the broadened quantum pulse caused by the long-distance fiber dispersion can be recompressed, so that the quantum pulse has a narrower The pulse width and higher peak power can reach the trigger threshold of the detector, thereby improving the final key generation rate of the optical fiber quantum key distribution system.
Description
Technical field
The present invention relates to fields of communication technology, and in particular to a kind of fiber optic quantum key distribution system and promotes quantum key
The method, apparatus of production rate.
Background technique
Quantum secret communication substantially communicatively generates key, since it can solve the safety of key simultaneously
Generate and distribution problem and by domestic and international academia and industry concern.In the application field of quantum secret communication, China is temporary
When maintain the leading position, the quantum key distribution system that domestic corporation releases just carries out extensive pilot application in some fields.
As research is gradually goed deep into what is applied, many technical bottlenecks of fiber optic quantum key distribution system are gradually exposed, and pass
Defeated distance is most important one one.Although current single-span transmission range can reach the fiber quantum key point of 80km
Hair system comparative maturity, and more remote cipher key delivery can be realized by credible relaying (such as " Beijing-Shanghai main line "), but
This scheme and infeasible in many cases.Such as the UHV transmission line in electric system, single-span transmission range
Usually in 200~400km, signal relaying cannot achieve halfway；For another example in classical submarine communication cable system, optical signal is usual
Transmission range every 400km just can be relayed once；And quantum pulse is after long-distance optical fiber transmits, in addition to pulse function
Rate be attenuated it is outer, pulse width as effect of dispersion and obviously broaden, peak power is remarkably decreased, because peak power reaches
Less than detector trigger threshold and ignored number of pulses is significantly increased, eventually result in fiber optic quantum key distribution system
Final key production rate is insufficient.
Summary of the invention
In view of this, the embodiment of the invention provides a kind of fiber optic quantum key distribution system and promoting quantum key generation
The method, apparatus of rate, to solve pulse after long-distance optical fiber transmits because the trigger threshold of detector is not achieved in peak power
And lead to the problem of the final key production rate deficiency of fiber optic quantum key distribution system.
According in a first aspect, being used for optical fiber the embodiment of the invention provides a kind of method for promoting quantum key production rate
Quantum key distribution system, fiber optic quantum key distribution system include that quantum pulse sending device, transmission fiber, dispersion compensation are set
Standby, quantum pulse receiving device, the method for promoting quantum key production rate include: to obtain quantum key production rate, quantum key
Production rate is the quantum key bit number generated in the unit time；Judge whether quantum key production rate is less than preset value；Equivalent
When sub-key production rate is less than preset value, optical fiber dispersion compensation is carried out.
Optionally, carrying out optical fiber dispersion compensation includes: the abbe number and length value for obtaining transmission fiber；According to dispersion system
Several and length value, determines the dispersion measure of transmission fiber；Color is carried out to fiber optic quantum key distribution system according to the dispersion measure of optical fiber
Dissipate compensation.
Optionally, carrying out dispersion compensation to fiber optic quantum key distribution system according to the dispersion measure of optical fiber includes: to call extremely
A few chirped fiber grating and/or dispersion compensating fiber carry out dispersion compensation to fiber optic quantum key distribution system.
Optionally, call at least one chirped fiber grating and/or dispersion compensating fiber to fiber optic quantum key distribution system
It includes: to obtain chirped fiber grating and/or dispersion compensating fiber unit dispersion compensation values that system, which carries out dispersion compensation,；According to transmission light
The quantity of chirped fiber grating and/or dispersion compensating fiber that fine dispersion measure and the determination of unit dispersion compensation values need to be called；It presses
Call chirped fiber grating and/or dispersion compensating fiber to optical fiber according to the quantity of chirped fiber grating and/or dispersion compensating fiber
Quantum key distribution system carries out dispersion compensation.
Optionally, when quantum key production rate is less than preset value, judge whether quantum key production rate is less than preset value
It is as caused by the dispersion of transmission fiber；It is strictly to be led by the dispersion of transmission fiber when quantum key production rate is less than preset value
When cause, optical fiber dispersion compensation is carried out.
Optionally, when quantum key production rate, which is less than preset value, to be caused by the dispersion of transmission fiber, without light
Fine dispersion compensation.
According to second aspect, the embodiment of the invention provides a kind of devices for promoting quantum key production rate, are used for optical fiber
Quantum key distribution system, fiber optic quantum key distribution system include that quantum pulse sending device, transmission fiber, dispersion compensation are set
Standby, quantum pulse receiving device, device include: acquisition module, and for obtaining quantum key production rate, quantum key production rate is
The quantum key bit number generated in unit time；Judgment module, for judging whether quantum key production rate is less than preset value；
Compensating module, for carrying out optical fiber dispersion compensation when quantum key production rate is less than preset value.
According to the third aspect, the embodiment of the invention provides a kind of controllers, comprising: at least one processor；And with
The memory of at least one processor communication connection；Wherein, memory is stored with the instruction that can be executed by a processor, instruction
It is executed by least one processor, so that at least one processor is executed as in first aspect or any embodiment of first aspect
Promotion quantum key production rate method.
According to fourth aspect, the embodiment of the invention provides a kind of fiber optic quantum key distribution systems, comprising: quantum pulse
Sending device；Transmission fiber；Dispersion compensation unit；Quantum pulse receiving device；As the third aspect or the third aspect are arbitrarily implemented
Controller in mode.
Optionally, dispersion compensation unit includes: at least one chirped fiber grating and/or dispersion compensating fiber.
The embodiment of the invention provides a kind of methods for promoting quantum key production rate, by quantum key production rate mistake
Low fiber optic quantum key distribution system carries out optical fiber dispersion compensation, can will lead to broadening due to the fibre-optical dispersion of long range
Quantum pulse re-compresses, or even recovers the pulse shape before transmission, the quantum arteries and veins for receiving quantum pulse receiving device
It rushes width and is restored to initial transmission state, is i.e. quantum pulse possesses relatively narrow pulsewidth and higher peak power, so as to reach
To the trigger threshold of detector, so as to promote the final key production rate of fiber optic quantum key distribution system.
Detailed description of the invention
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art be briefly described, it should be apparent that, it is described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, is also possible to obtain other drawings based on these drawings.
Fig. 1 shows the method flow diagram that the embodiment of the present invention promotes quantum key production rate；
Fig. 2 shows the F-M of the embodiment of the present invention (Faraday-Michelson) type GHz phase-modulation quantum secrecy
The structural schematic diagram of communication system；
It is bent that Fig. 3 a shows the dispersion of dispersion compensating fiber of the embodiment of the present invention and G652 optical fiber near 1550nm wavelength
Line schematic diagram；
Fig. 3 b shows chirped fiber gratings schematic diagram of the embodiment of the present invention；
Fig. 4 shows the structural block diagram that the embodiment of the present invention promotes the device of quantum key production rate；
Fig. 5 shows the structural schematic diagram of controller of the embodiment of the present invention.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those skilled in the art are not having
Every other embodiment obtained under the premise of creative work is made, shall fall within the protection scope of the present invention.
The embodiment of the invention provides a kind of methods for promoting quantum key production rate, are used for fiber optic quantum key distribution system
System, fiber optic quantum key distribution system include that quantum pulse sending device, transmission fiber, dispersion compensation unit, quantum pulse connect
Receiving unit, this method are as shown in Figure 1, comprising:
S101. quantum key production rate is obtained, quantum key production rate is the quantum key bit generated in the unit time
Number.
S102. judge whether quantum key production rate is less than preset value.
In the present embodiment, if quantum key production rate is greater than preset value, enter S104；If quantum key generates
Rate is less than preset value, then enters S103.Preset value is the numerical value obtained according to actual needs setting or a large amount of practical experiences, this
Embodiment does not do specific restriction to preset value.
S103. when quantum key production rate is less than preset value, optical fiber dispersion compensation is carried out.
In the present embodiment, when quantum pulse is after long-distance optical fiber transmits, other than pulse power is attenuated, arteries and veins
Rush width as effect of dispersion and obviously broaden, peak power is remarkably decreased, due to the trigger threshold of detector is not achieved
Ignored number of pulses is significantly increased, and the final key production rate of system also accordingly can be reduced quickly.Fortunately, draw with optical fiber
The power attenuation of the quantum pulse risen is different, and pulse spreading process caused by fibre-optical dispersion is reversible, that is, passes through certain color
Scattered compensation method can re-compress the pulse being broadened, and restore original relatively high pulse peak power, in turn
Promote the final key production rate of fiber optic quantum key distribution system.Optical fiber dispersion compensation implantation of device position is more flexible, both may be used
It after being laid in transmission fiber, can also be laid in front of transmission fiber, it might even be possible to be integrated in quantum pulse sending device
Or in quantum pulse receiving device.
S104. without optical fiber dispersion compensation.
By carrying out optical fiber dispersion compensation to the too low fiber optic quantum key distribution system of quantum key production rate, can incite somebody to action
Since the fibre-optical dispersion of long range causes the quantum pulse of broadening to re-compress, or even the pulse shape before transmission is recovered, made
The quantum pulse width that quantum pulse receiving device receives is restored to initial transmission state, i.e. quantum pulse possesses relatively narrow arteries and veins
Wide and higher peak power, so as to reach the trigger threshold of detector, so as to promote fiber optic quantum key distribution
The final key production rate of system.
In an alternate embodiment of the invention, carrying out optical fiber dispersion compensation includes: the abbe number and length value for obtaining transmission fiber；
According to abbe number and length value, the dispersion measure of transmission fiber is determined；According to the dispersion measure of optical fiber to fiber optic quantum key distribution
System carries out dispersion compensation.
In the present embodiment, it is with F-M (Faraday-Michelson) type GHz phase-modulation quantum secret signalling
It is illustrated for fiber optic quantum key distribution system, as shown in Fig. 2, including transmitting terminal Alice, transmission fiber G652, dispersion
Compensate equipment, receiving end Bob.The pulse that quantum pulse light source (Pulse Laser) in transmitting terminal Alice issues is through annular
The port 1 of device (Circulator) inputs, and port 2 becomes the two-arm that dipulse respectively enters Michelson Length discrepancy after exporting,
It is wherein directly reflected back port 2 through Faraday mirror (FM) all the way to be exported by port 3, another way is by PM phase-modulation load letter
After number, port 2 is reflected back through Faraday mirror (FM) and is exported by port 3.Two pulses at this time will separate in time (pulse it
Between time interval depend on Michelson two-arm arm length difference), and pulse have relatively narrow pulsewidth and higher peak work
Rate.The burst pulse of output in addition to being influenced by optical fiber attenuation, also will receive fibre-optical dispersion after the transmission of long range G652 optical fiber
Influence, this causes pulse width obviously to broaden, and peak power declines to a great extent, finally because power is unable to reach sonde door limit value
System key production rate is caused rapidly to reduce, or even can not be at code.Carrying out optical fiber dispersion compensation includes: the color for obtaining G652 optical fiber
Dissipate the length value of coefficient and G652 optical fiber；The product of the abbe number and length value is calculated to get the dispersion measure of G652 optical fiber is arrived；
Increase suitable dispersion compensation module to F-M (Faraday-Michelson) type GHz phase tune according to the dispersion measure of G652 optical fiber
Quantum secret communication system processed carries out dispersion compensation.After increasing suitable dispersion compensation module in transmission line, dispersion
Compensating effect can re-compress the pulse after broadening, in addition recover transmission before pulse shape (certain power loss can not
Restore), then after received end Bob interferometric demodulation, the pulse possessed compared with narrow spaces and high peak power can triggered as normal light
Sub- detector (Photon Detector) simultaneously enters post-processing (Post Processing) stage into code, hence it is evident that lifting system is close
Key production rate.
In an alternate embodiment of the invention, dispersion compensation packet is carried out to fiber optic quantum key distribution system according to the dispersion measure of optical fiber
It includes: at least one chirped fiber grating and/or dispersion compensating fiber being called to carry out dispersion benefit to fiber optic quantum key distribution system
It repays.
In the present embodiment, there are mainly two types of current relatively common optical fiber dispersion compensation methods, one kind is mended based on dispersion
It repays optical fiber (DCF), another kind is based on chirped fiber grating, and basic principle is as shown in Fig. 3.Fig. 3 a is G652 optical fiber and DCF
Dispersion curve schematic diagram near 1550nm wavelength, horizontal axis are wavelength (unit nm), and the longitudinal axis is what unit length of fibre introduced
Time delay (unit ps/km), any point in curve indicate that the light of specific wavelength transmits 1km introduced time delay in the optical fiber,
The slope of curve is not that there are effect of dispersion (i.e. the light transmission speed of different wave length are different) for this kind of optical fiber of 0 explanation.It can be sent out from figure
The chromatic dispersion gradient of existing G652 optical fiber is about 17ps/ (nmkm), illustrates that the time delay of light in the medium increases with the increase of wavelength
Add；And the chromatic dispersion gradient of DCF illustrates the time delay of light in the medium with the increasing of wavelength usually at -80~-150ps/ (nmkm)
Add and reduce, and the reduction amount of every transmission 1km time delay is about 5~9 times of G652 optical fiber.Using DCF chromatic dispersion gradient with
The feature that G652 chromatic dispersion gradient symbol is opposite and absolute value is larger, we can be by shorter DCF and longer G652 optical fiber group
It closes and uses, both make after cascading overall dispersion curve slope level off to 0 by reasonable Design of length, i.e., own in light pulse
Wavelength component time delay after the transmission of this combination of fiber-optic is approximately equal, and pulse shape will not be substantially change, and be utilized in other words
DCF compensates for the pulse broadening effect as caused by long range G652 optical fiber.Fig. 3 b is the dispersion compensation based on chirped fiber grating
Schematic diagram, input pulse pulsewidth after the transmission of long range G652 optical fiber obviously broaden, and enter chirped light by optical circulator later
Grid.The grating Bragg period of chirp grating is in periodical linear change along optical fiber direction, therefore the light of different wave length passes through Zhou
Sing grating when the position reflected it is different, cause the time delay introduced different, be equivalent to effect of dispersion.For the dispersion of G652 optical fiber
Compensation, we can design the length and chirp value of grating, the light (blue shift) for making the distal end reflecting short of grating long, proximal end reflection
The light (red shift) of long wavelength, makes up the delay inequality between each wavelength component, to recover the shape of input pulse.
In an alternate embodiment of the invention, call at least one chirped fiber grating and/or dispersion compensating fiber to Fiber quantum
It includes: to obtain chirped fiber grating and/or dispersion compensating fiber unit dispersion compensation values that key distribution system, which carries out dispersion compensation,；
The chirped fiber grating and/or dispersion compensating fiber that need to be called according to the dispersion measure of transmission fiber and the determination of unit dispersion compensation values
Quantity；Chirped fiber grating and/or dispersion compensation light are called according to the quantity of chirped fiber grating and/or dispersion compensating fiber
Fibre carries out dispersion compensation to fiber optic quantum key distribution system.
In the present embodiment, chirped fiber grating and dispersion compensating fiber can be made the mould of known compensation dispersion measure respectively
Block, according to the dispersion compensation values of the dispersion measure of transmission fiber, single chirped fiber grating or single dispersion compensated optical fibre module, just
The quantity that can determine the chirped fiber grating and/or dispersion compensating fiber that need to call, by required amount of chirped fiber grating
And/or dispersion compensation can be carried out to fiber optic quantum key distribution system after dispersion compensating fiber cascade.
In an alternate embodiment of the invention, when quantum key production rate is less than preset value, judge that quantum key production rate is less than
Whether preset value is as caused by the dispersion of transmission fiber；It is strictly by transmission light when quantum key production rate is less than preset value
When fine dispersion causes, optical fiber dispersion compensation is carried out, is not the color by transmission fiber when quantum key production rate is less than preset value
It dissipates when causing, without optical fiber dispersion compensation.In the present embodiment, judge quantum key production rate be less than preset value whether be by
It can be judged by experience caused by the dispersion of transmission fiber, be transmitted such as high frequency (~1GHz) long-distance optical fiber
Phase modulation-type QKD equipment, if the loss value of transmission fiber lower than equipment normally but can not be at code at the nominal value of code,
It can be by least one chirped fiber grating and/or dispersion compensating fiber being inserted into before/after transmission fiber come observed quantity
Whether sub-key production rate improves, if quantum key production rate improves, it is default to judge that quantum key production rate is less than
Value is as caused by the dispersion of transmission fiber.Certainly, in other examples, can also be judged by other methods
Quantum key production rate is less than whether preset value is as caused by the dispersion of transmission fiber.When quantum key production rate is less than in advance
If value is strictly when being caused by the dispersion of transmission fiber, to carry out optical fiber dispersion compensation.When quantum key production rate is less than preset value
It is not to illustrate that there are some problems for possible fiber optic quantum key distribution system itself when being caused by the dispersion of transmission fiber.At this
In embodiment, the repetition rate for improving light-pulse generator can promote remote quantum key production rate to a certain extent, it is logical
The quantum pulse number for increasing and issuing in the unit time is crossed, the pulse that detector can detect after transmitting at a distance is promoted
Number, to be conducive to the final key production rate of system.The repetition rate of quantum pulse sending device inner light source can be
40MHz, 1GHz even more high frequency are illustrated in the present embodiment, current by taking the repetition rate of light source is 1GHz as an example
Technical conditions under, when the repetition rate of light source be less than 1GHz when, low speed QKD equipment can be replaced with into GHz equipment to be promoted
Remote quantum key production rate.After using GHz equipment and excluding the influence of fibre-optical dispersion, quantum key production rate is still
Lower than preset value, then fiber optic quantum key distribution system can be checked, whether judge fiber optic quantum key distribution system
Failure.
The embodiment of the invention provides a kind of devices for promoting quantum key production rate, are used for fiber optic quantum key distribution system
System, fiber optic quantum key distribution system include that quantum pulse sending device, transmission fiber, dispersion compensation unit, quantum pulse connect
Receiving unit, the device are as shown in Figure 4, comprising: module 41 are obtained, for obtaining quantum key production rate, quantum key production rate
For the quantum key bit number generated in the unit time；Judgment module 42, for judging it is pre- whether quantum key production rate is less than
If value；Compensating module 43, for carrying out optical fiber dispersion compensation when quantum key production rate is less than preset value.
The embodiment of the invention provides a kind of controllers, comprising: at least one processor 71；And it is handled at least one
The memory 72 of device communication connection；In Fig. 5 by taking a processor 71 as an example.
Detection device can also include: input unit 73 and output device 74.
Processor 71, memory 72, input unit 73 and output device 74 can be connected by bus or other modes,
In Fig. 5 for being connected by bus.
Processor 71 can be central processing unit (CentralProcessingUnit, CPU).Processor 71 can also be
Other general processors, digital signal processor (DigitalSignalProcessor, DSP), specific integrated circuit (Appli
CationSpecificIntegratedCircuit, ASIC), field programmable gate array (Field-
ProgrammableGateArray, FPGA) either other programmable logic device, discrete gate or transistor logic, point
The combination of the chips such as vertical hardware component or above-mentioned all kinds of chips.General processor can be microprocessor or the processor
It is also possible to any conventional processor etc..
Memory 72 is used as a kind of non-transient computer readable storage medium, can be used for storing non-transient software program, non-
Transient computer executable program and module, the method such as the promotion quantum key production rate in the embodiment of the present application are corresponding
Program instruction/module.Non-transient software program, instruction and the module that processor 71 is stored in memory 72 by operation,
Thereby executing the various function application and data processing of server, i.e. realization above method embodiment promotes quantum key and generates
The method of rate.
Memory 72 may include storing program area and storage data area, wherein storing program area can storage program area,
Application program required at least one function；Storage data area can store the use of the processing unit according to user terminal operations
The data etc. created.In addition, memory 72 may include high-speed random access memory, it can also include non-transient storage
Device, for example, at least a disk memory, flush memory device or other non-transient solid-state memories.In some embodiments,
Optional memory 72 includes the memory remotely located relative to processor 71, these remote memories can pass through network connection
To image detection, processing unit.The example of above-mentioned network includes but is not limited to internet, intranet, local area network, moves and lead to
Letter net and combinations thereof.
Input unit 73 can receive the number or character information of input, and generate the use with the processing unit of user terminal
Family setting and the related key signals input of function control.Output device 74 may include that display screen etc. shows equipment.
One or more module is stored in memory 72, when being executed by one or more processor 71, is executed
Method as shown in Figure 1.
The embodiment of the invention provides a kind of fiber optic quantum key distribution systems, comprising: quantum pulse sending device；Transmission
Optical fiber；Dispersion compensation unit；Quantum pulse receiving device；Such as the controller in above-mentioned any embodiment.In the present embodiment,
Controller can be set in dispersion compensation unit, and dispersion compensation unit installation position is more flexible, can both be laid in transmission
It after optical fiber, can also be laid in front of transmission fiber, it might even be possible to be integrated in quantum pulse sending device or quantum pulse connects
In receiving unit.Dispersion compensation unit further include: at least one chirped fiber grating and/or dispersion compensating fiber.
It is that can lead to it will be understood by those skilled in the art that realizing all or part of the process in above-described embodiment method
Computer program is crossed to instruct relevant hardware and complete, the program can be stored in a computer-readable storage medium
In, the program is when being executed, it may include such as the process of the embodiment of above-mentioned each method.Wherein, the storage medium can for magnetic disk,
CD, read-only memory (Read-Only Memory, ROM), random access memory (Random Access
Memory, RAM), flash memory (Flash Memory), hard disk (Hard Disk Drive, abbreviation: HDD) or solid state hard disk
(Solid-State Drive, SSD) etc.；The storage medium can also include the combination of the memory of mentioned kind.
Although being described in conjunction with the accompanying the embodiment of the present invention, those skilled in the art can not depart from the present invention
Spirit and scope in the case where various modifications and variations can be made, such modifications and variations are each fallen within by appended claims institute
Within the scope of restriction.
Claims (10)
1. a kind of method for promoting quantum key production rate, which is characterized in that be used for fiber optic quantum key distribution system, the light
Fine quantum key distribution system include quantum pulse sending device, transmission fiber, dispersion compensation unit, quantum pulse reception set
It is standby, which comprises
Quantum key production rate is obtained, the quantum key production rate is the quantum key bit number generated in the unit time；
Judge whether the quantum key production rate is less than preset value；
When the quantum key production rate is less than preset value, optical fiber dispersion compensation is carried out.
2. the method according to claim 1 for promoting quantum key production rate, which is characterized in that the carry out fibre-optical dispersion
Compensation includes:
Obtain the abbe number and length value of the transmission fiber；
According to the abbe number and length value, the dispersion measure of the transmission fiber is determined；
Dispersion compensation is carried out to the fiber optic quantum key distribution system according to the dispersion measure of the optical fiber.
3. the method according to claim 2 for promoting quantum key production rate, which is characterized in that described according to the optical fiber
Dispersion measure to the fiber optic quantum key distribution system carry out dispersion compensation include:
At least one chirped fiber grating and/or dispersion compensating fiber is called to carry out color to the fiber optic quantum key distribution system
Dissipate compensation.
4. the method according to claim 3 for promoting quantum key production rate, which is characterized in that described to call at least one
Chirped fiber grating and/or dispersion compensating fiber carry out dispersion compensation to the fiber optic quantum key distribution system and include:
Obtain the chirped fiber grating and/or dispersion compensating fiber unit dispersion compensation values；
The chirped fiber grating that need to be called according to the dispersion measure of the transmission fiber and the unit dispersion compensation values determination
And/or the quantity of dispersion compensating fiber；
The chirped fiber grating and/or dispersion are called according to the quantity of the chirped fiber grating and/or dispersion compensating fiber
Compensated optical fiber carries out dispersion compensation to the fiber optic quantum key distribution system.
5. the method according to claim 1 for promoting quantum key production rate, which is characterized in that when the quantum key is raw
When being less than preset value at rate,
Judge that quantum key production rate is less than whether preset value is as caused by the dispersion of the transmission fiber；
When quantum key production rate, which is less than preset value, to be caused by the dispersion of the transmission fiber, optical fiber dispersion compensation is carried out.
6. the method according to claim 5 for promoting quantum key production rate, which is characterized in that when quantum key production rate
It is not when being caused by the dispersion of the transmission fiber, without optical fiber dispersion compensation less than preset value.
7. a kind of device for promoting quantum key production rate, which is characterized in that be used for fiber optic quantum key distribution system, the light
Fine quantum key distribution system include quantum pulse sending device, transmission fiber, dispersion compensation unit, quantum pulse reception set
Standby, described device includes:
Module is obtained, for obtaining quantum key production rate, the quantum key production rate is the quantum generated in the unit time
Key bit number；
Judgment module, for judging whether the quantum key production rate is less than preset value；
Compensating module, for carrying out optical fiber dispersion compensation when the quantum key production rate is less than preset value.
8. a kind of controller characterized by comprising
At least one processor；And the memory being connect at least one described processor communication；Wherein, the memory is deposited
Contain the instruction that can be executed by one processor, described instruction is executed by least one described processor so that it is described extremely
The method that a few processor executes promotion quantum key production rate as claimed in any one of claims 1 to 6.
9. a kind of fiber optic quantum key distribution system characterized by comprising
Quantum pulse sending device；
Transmission fiber；
Dispersion compensation unit；
Quantum pulse receiving device；
Controller as claimed in claim 8.
10. fiber optic quantum key distribution system according to claim 9, which is characterized in that the dispersion compensation unit packet
It includes:
At least one chirped fiber grating and/or dispersion compensating fiber.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110880971A (en) * | 2019-11-22 | 2020-03-13 | 中南大学 | Chirp-based continuous variable quantum key distribution method and distribution system |
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| CN115276824A (en) * | 2022-07-26 | 2022-11-01 | 中国人民解放军国防科技大学 | Quantum noise stream encryption transmitter, receiver, communication system and method |
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