CN206775514U - Time phase without phase-modulator encodes quantum key distribution system and its component - Google Patents
Time phase without phase-modulator encodes quantum key distribution system and its component Download PDFInfo
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- CN206775514U CN206775514U CN201720613066.7U CN201720613066U CN206775514U CN 206775514 U CN206775514 U CN 206775514U CN 201720613066 U CN201720613066 U CN 201720613066U CN 206775514 U CN206775514 U CN 206775514U
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Abstract
The utility model provides quantum key distribution system and its light source, the encoding apparatus and decoding apparatus that a kind of time phase without phase-modulator encodes.Wherein, light-source structure of the present utility model can realize the phase-modulation under phase basic vector coding in the case of not by phase-modulator, so as to eliminate phase-modulator in the prior art and the modulation to main laser modulated signal, the complexity of quantum key distribution system is reduced, is advantageous to the application of quantum communication network technology.
Description
Technical field
It the utility model is related to Quantum Secure Communication field, and in particular to without phase-modulator based on time phase
The quantum key distribution system of position coding and the light source for the system, encoding apparatus and decoding apparatus.
Background technology
The coding in BB84 quantum key distribution systems mainly uses polarization encoder or phase code at present.Compiled compared to polarization
Code, existing phase code systematic difference scene is relatively adapted to the more violent situation of polarization variations, but it is surely fine to differ
Ground is applied to long range aerial optical cable environment.Time phase encoding scheme can address all of these issues, and it can not only do
To complete polarization independence, and receiving terminal Insertion Loss can be substantially reduced, so as to improve system into code check, into code distance, with
And realize the stability of anti-external environment disturbance；Simultaneously, additionally it is possible to better adapt to long range aerial optical cable environment.
Existing based in the quantum key distribution system of time phase coding, the light based on injection lock mode is employed
Source structure, thus improve the performance of X, Z basic vector.But in these quantum key distribution systems, or need to adjust by phase
Device PM processed load-modulate phase 0 or π between 2 light pulses of X basic vectors, thus phase in deadline phase code compile
Code (pending undocumented earlier application CN201611217678.0 for example, see the applicant etc.), or by main laser
The modulation of the modulated signal of device carries out phase-modulation to realize the coding under X basic vectors (for example, see Chinese patent application
CN201611199570.3).However, applicants have discovered that prior art time phase coding quantum key distribution system still
So there are problems that.
System for using phase-modulator PM encode under X basic vectors, it needs to set phase-modulation in transmitting terminal
Device PM carrys out phase modulation, correspondingly needs to set the photoelectricity drive circuit of phase-modulation.In this scheme, it needs what is set
It is very expensive in phase-modulator price, and require that electrical signal needs to meet about 5V's or so in phase-modulation drive circuit
Flat π voltages, thus it is very high to modulation circuit requirement.In addition, cause driving voltage output unstable in extraneous environmental change
In the case of fixed, phase-modulation is likely to occur deviation, therefore, to avoid thus caused bit error rate rise and potential safety hazard etc. from asking
Topic, it is also necessary to which corresponding calibrator (-ter) unit is set, so as to add the cost of whole quantum key distribution system and complexity.
For providing the scheme encoded under X basic vectors by the modulation of main laser modulated signal, needed in transmitting terminal
Point-device control is carried out to the modulated signal of main laser and modulation rate requires very high, this driving electricity to electronics
Road proposes very high requirement.In addition, in the case where extraneous environmental change causes driving voltage output unstable, phase is adjusted
Make it is equally possible there is deviation, therefore, the problems such as to avoid thus caused bit error rate rise and potential safety hazard, it may also be necessary to
Corresponding calibrator (-ter) unit is set, so as to add the cost of whole quantum key distribution system and complexity.
Utility model content
In view of the shortcomings of the prior art, the utility model provides what a kind of time phase without phase-modulator encoded
Quantum key distribution system and its light source, wherein, light-source structure of the present utility model can be by the feelings of phase-modulator
The phase-modulation under phase basic vector coding is realized under condition, so as to eliminate phase-modulator in the prior art and main laser is adjusted
The modulation of signal processed, the complexity of quantum key distribution system is reduced, be advantageous to the application of quantum communication network technology.
The utility model discloses a kind of light source that can be used for time encoding and phase code simultaneously.The light source can wrap
Include：Main laser, the driving of its main drive signal provided within a system cycle based on main source driving signal export one
Main laser pulse, for forming seed light；And from laser, its based on from source driving signal provide from drive signal
Driving under the excitation of the seed light by inject lock in a manner of export from laser pulse, for encoded signal light arteries and veins
Punching.Wherein, it is described to include first, second, and third from drive signal from drive signal, and within a system cycle, institute
State first, second, and third randomly exported from one in drive signal it is described from laser to drive.Also, described
First under the driving of drive signal, described that one first is only exported from laser from laser arteries and veins within a system cycle
Punching, and described first from laser pulse be derived from main laser pulse positioned at the pulse portion of very first time position
What shunt excitation was encouraged；It is described that one is only exported from laser within a system cycle under the described second driving from drive signal
Second from laser pulse, and described second is derived from when being located at second of main laser pulse from laser pulse
Between position segment pulse excitation；And under the 3rd driving from drive signal, within a system cycle, institute
State from laser and export continuous two the 3rd from laser pulse, and described two three be to come from one respectively from laser pulse
The segment pulse excitation for being located at the 3rd time location and the 4th time location of the individual main laser pulse.
Of the present utility model in a first aspect, light source can also include the first beam splitter, and the main laser can wrap
Include the first main laser and the second main laser.Wherein, first beam splitter can include first port, second port, the
Three ports and the 4th port, and be configured to：The first master of the first main laser output is received via the first port
Laser pulse is to be divided into two segment pulses of the first main laser pulse, and respectively via the 3rd port
Described two segment pulses of the first main laser pulse are exported to described from laser with the 4th port；And
The second main laser pulse of second main laser output is received via the second port to be divided into described second
Two segment pulses of main laser pulse, and respectively via the 3rd port and the 4th port by second main laser
Described two segment pulses of pulse are exported to described from laser.
Further, the 3rd port of first beam splitter and the light path and institute from light path between laser
Stating the 4th port of the first beam splitter can be configured to different from the light path from light path between laser so that institute
Two segment pulses are stated on different time locations into described from laser.Preferably, it is described from laser with it is described
Adjustable time delayses element can be provided between beam splitter, to realize the difference of the light path.
Further, the very first time position can be identical with the 3rd time location, second time location
Can be identical with the 4th time location.
Further, in the light source of the utility model first aspect, the second beam splitter can also be included, it can be with institute
State the first beam splitter and form a unequal arm interferometer.Wherein, the unequal arm interferometer and described from can be between laser
Provided with the first optical transmission components, first optical transmission components include three transmission ports.
Further, in the light source of the utility model first aspect, the 3rd main laser can also be included, and it is described
3rd main laser is configured to be connected with second beam splitter so that the 3rd main laser of the 3rd main laser output
Device pulse is divided into two segment pulses to be injected separately into first main laser and described through the unequal arm interferometer
Two main lasers.
Further, in the light source of the utility model first aspect, the 3rd main laser and second can also be included
Optical transmission components, wherein, second optical transmission components are arranged on the long-armed or galianconism of the unequal arm interferometer, and
Connect the 3rd main laser so that the 3rd main laser pulse of the 3rd main laser output is through the beam splitter point
Into two segment pulses to be injected separately into first main laser and second main laser.
According to second aspect of the present utility model, in light source, it is described from laser can include first from laser and
Second is configured to receive the output of the 4th port of first beam splitter from laser, described first from laser,
Described second is configured to receive the output of the 3rd port of first beam splitter from laser.
Further, in the light source of the utility model second aspect, first beam splitter is with described first from laser
The first optical transmission components are also provided between device, first beam splitter and described second can also set between laser
There are the second optical transmission components, and the optical transmission components include three transmission ports.Also, described first can from laser
Can distinguish via first optical transmission components and described second from laser via second optical transmission components
Connect the second beam splitter.Further, second beam splitter can be polarization beam apparatus, so that by the light source output
Light pulse can be used for carrying out efficiently encoding and decoding.
Further, in the light source of the utility model second aspect, the 3rd main laser can also be included, described
Three main lasers connect first beam splitter via the 3rd optical transmission components so that the of the 3rd main laser output
Three main laser pulses through first beam splitter be divided into two segment pulses to be injected separately into first main laser and
Second main laser.
According to the third aspect of the present utility model, in light source, it is described from laser can include first from laser and
Second from laser, and described first connects described the of first beam splitter from laser and described second from laser respectively
Four ports and the 3rd port, and one in first, second main laser also sets between first beam splitter
There are the first optical transmission components, the optical transmission components include three transmission ports.
Further, the 3rd main laser can also be included in light source, the 3rd main laser connects the second beam splitting
Device so that the 3rd main laser pulse of the 3rd main laser output is divided into two segment pulses through second beam splitter
To be injected separately into first main laser and second main laser.
Further, can lead between second beam splitter, first main laser and first beam splitter
Cross the connection of the second optical transmission components, second beam splitter, second main laser and first optical transmission components
Between can be connected by the 3rd optical transmission components.
The invention also discloses a kind of code device available for phase code without phase-modulator, it can be with
Including any one in above-mentioned light source.
Further, code device of the present utility model can further include intensity modulator, the intensity modulated
Device is used to modulate described first from laser pulse, second from laser pulse, the 3rd from the light relatively between laser pulse
By force.
The invention also discloses a kind of decoding apparatus available for time phase encoding scheme, it can be suitable for
The time phase coding sent to above-mentioned code device decodes.Decoding apparatus of the present utility model can include basic vector and select
Unit, time basic vector decoding unit and phase basic vector decoding unit, wherein, the basic vector selecting unit is configured to according to default
Probability is by one in the basic vector pulse input of reception to the time basic vector decoding unit and the phase basic vector decoding unit.
Further, the phase basic vector decoding unit can include unequal arm interferometer.
Further, the unequal arm interferometer can be PBS-BS types MZ interferometers, it include polarization beam apparatus,
Beam splitter and the long-armed and galianconism to fall between.In order to realize two under the phase basic vector perpendicular to one another to polarization direction
Pulse is efficiently decoded, and the polarization beam apparatus can be configured to make previous in continuous two pulses under phase basic vector
Individual pulse is transmitted along the long-armed transmission, the latter pulse along the galianconism.
The invention also discloses a kind of quantum key distribution system based on time phase coding, it can include upper
State any one in any one or the above-mentioned decoding apparatus in light source.
Brief description of the drawings
Fig. 1 diagrammatically illustrates a kind of time phase code device of prior art；
Fig. 2A diagrammatically illustrates the light-pulse generator structure of the utility model first embodiment；
Fig. 2 B diagrammatically illustrate the operation principle in the light source of the utility model first embodiment；
Fig. 3 A diagrammatically illustrate the light-pulse generator structure of the utility model second embodiment；
Fig. 3 B diagrammatically illustrate the operation principle in the light source of the utility model second embodiment；
Fig. 4 A diagrammatically illustrate the light-pulse generator structure of the utility model 3rd embodiment；
Fig. 4 B diagrammatically illustrate the operation principle in the light source of the utility model 3rd embodiment；
Fig. 5 diagrammatically illustrates the light-pulse generator structure of the utility model fourth embodiment；
Fig. 6 diagrammatically illustrates the light-pulse generator structure of the embodiment of the utility model the 5th；
Fig. 7 diagrammatically illustrates the light-pulse generator structure of the utility model sixth embodiment；
Fig. 8 diagrammatically illustrates the light-pulse generator structure of the embodiment of the utility model the 7th；And
Fig. 9 diagrammatically illustrates decoding apparatus of the present utility model.
Embodiment
Hereinafter, exemplary embodiment of the present utility model is with reference to the accompanying drawings to be described in detail.The following examples with
Way of example provides, fully to pass on spirit of the present utility model to the utility model those skilled in the art.Cause
This, the utility model is not limited to embodiment disclosed herein.
According to the utility model, light source can include：Main laser, its main drive signal provided in main source driving signal
The lower output main laser pulse of driving, for forming seed light；And from laser, its from source driving signal provide from
The lower output of drive signal driving is from laser pulse, for being encoded.It can include first, second and the from drive signal
Three from drive signal, and can randomly export first, second, and third from one in drive signal from source driving signal.
In one system cycle, one first is only exported from laser pulse under the first driving from drive signal from laser, and
First is derived from the segment pulse excitation positioned at very first time position of main laser pulse from laser pulse.One
In the individual system cycle, one second is only exported under the second driving from drive signal from laser from laser pulse, and
Two are derived from what the segment pulse positioned at the second time location of main laser pulse encouraged from laser.In a system
In cycle, continuous two the 3rd are exported from laser pulse under the 3rd driving from drive signal from laser, and the two
3rd from laser pulse be come from main laser pulse respectively be located at the 3rd time location and the 4th time location
Segment pulse excitation.Due to for encouraging the two the 3rd to be derived from same main laser from the seed light of laser pulse
Two segment pulses of pulse, fixed phase relation can be formed between two seed lights, therefore in the luminous of injection locking
Under mechanism, continuous two caused by the two seed light stimulus for be made up of two segment pulses of same main laser pulse
3rd between laser pulse from will also form fixed and nonrandom phase relation.
In order in the case where that need not be modulated by phase-modulator or to main laser modulated signal
The phase-modulation to light pulse is realized, beam splitter can also be included in light source of the present utility model, and main laser can wrap
Include the first main laser and the second main laser.Wherein, beam splitter can include first to fourth port, and be configured to：Through
First main laser pulse is received to be divided into two the first main laser segment pulses by first port, and respectively via the
Three and the 4th port exports the two first main laser segment pulses to from laser；And receive the via second port
Two main laser pulses to be divided into two the second main laser segment pulses, and respectively via the third and fourth port by this
Two the second main laser segment pulses are exported to from laser.
3rd port of beam splitter and the 4th port from the light path between laser and beam splitter and between laser
Light path can be configured to different so that two segment pulses formed by same main laser pulse beam splitting are different
Enter on time location from laser, for exciting seed light from laser to inject lock mode.Those skilled in the art
It will be appreciated that the two main laser segment pulses be form it is foregoing come from main laser pulse positioned at not
With the segment pulse of time location.The difference of this light path can be adopted in various manners to realize, such as passes through different optical fiber
Length realizes, or in one or two light path sets delay element (such as electric adjustable time delay) to realize wherein.It is excellent
Selection of land, can by the way of delay element is set, thus come meet different decoding apparatus may have the different time between
Every requiring, the controllability of this time interval enables light source to be flexibly applied to coding corresponding with various decoding apparatus
Device.
Because the two main laser segment pulses formed through beam splitter beam splitting correspond respectively to same main laser pulse
Transmitted light part and reflected beam portion on beam splitter, and those skilled in the art know, now will on reflected beam portion
There is the phase place change of pi/2, i.e. the phase difference of pi/2, in other words, two are will appear between the transmitted light part and reflected beam portion
It is poor that pi/2 phase will be formed between individual main laser segment pulse.Therefore, in this light-source structure, the first main laser arteries and veins
Between two main laser segment pulses that punching is formed through beam splitter phase difference (for example, its can be transmitted light part with it is anti-
The phase difference penetrated between light part, 0- pi/2s=- pi/2), two masters formed relative to the second main laser pulse through beam splitter
Phase difference between laser pulse part is (for example, it can be correspondingly the phase between reflected beam portion and transmitted light part
Potential difference, pi/2-0=pi/2s), there is phase difference π.Correspondingly, made by the first main laser with injecting lock mode from laser
Two of output from the phase difference between laser pulse, with by the second main laser with inject lock mode make it is defeated from laser
Two gone out compare from the phase difference between laser pulse, and there is also π phase difference.As can be seen here, set in this structure
Put down, two can be realized from the π phases of phase difference between laser pulse simply by selecting different main lasers
Modulation, this phase-modulation obviously disclosure satisfy that the phase-modulation demand required for X basic vectors coding in time phase coding, so as to
Without other setting phase-modulator in conventional phase coding techniques with two from modulating 0 or π between laser pulse
The step of phase difference.
Herein, first, second, third or the 4th the time location such as time location could be used to indicate that one
Relative time locations in the system cycle.
Light source of the present utility model particularly suitable for time bit-phase code, wherein, first and second from laser
The coding that pulse can be used under Z basic vectors, i.e. time encoding；Continuous two the 3rd can be used under X basic vectors from laser pulse
Coding, i.e. phase code.In other words, when carrying out Z basic vectors coding, first, second can be exported from drive from source driving signal
One in dynamic signal, so that exporting one from excitation of the laser based on a main laser pulse has set time feature
(such as on the time it is preceding or rear) from laser pulse, for time encoding；When carrying out X basic vectors coding, from driving
Signal source can export the 3rd from drive signal, have so as to be based on a main laser pulse from laser and export continuous two
Stabilization time and phase relation from laser pulse, to meet the need of phase code.
Preferably, first, second can be configured to identical intensity from laser pulse, and continuous two the 3rd
The first and second half from laser pulse can be set to from the intensity of each of laser pulse.The very first time
Position can be identical with the 3rd time location.Second time location can be identical with the 4th time location.
Believe it will be readily appreciated by those skilled in the art that first, second, and third can be not limited to from drive signal from driving
Number, but can also have other from drive signal.Correspondingly, under the excitation of a main laser pulse, from the defeated of laser
Go out to be not limited to first, second, and third from laser pulse, but unique one can also be exported on other times position
It is individual from laser pulse, or export more it is continuous with stabilization time and phase relation from laser pulse.
In order to more fully understand principle of the present utility model, by taking the application in time bit-phase encoding scheme as an example,
Fig. 2-8 shows several embodiments of light source of the present utility model.In these embodiments, for illustrative
Purpose, only with from source driving signal output first, second, and third from drive signal, and the first, the 3rd time location is identical
And the second, the 4th time location it is identical exemplified by.However, those skilled in the art it will be appreciated that these embodiments only
It is exemplary, it is not desired to which the utility model is limited to these embodiments.
<Embodiment one>
The first exemplary embodiment according to light source of the present utility model is shown in Fig. 2A, the light source can include first
Main laser 11, the second main laser 12, from laser 13, the first beam splitter 141, the second beam splitter 142 and the first optics pass
Defeated element 15.
Optical transmission components 15 can include three port 1-3, and be configured to：The light entered from first port 1 can be with
Left from second port 2, the light entered from second port 2 can leave from the 3rd port 3.
Beam splitter 141,142 can include first to fourth port 1-4 respectively, wherein can by the incident light of first port 1
To be left through reflection by the 4th port 4, and left by the 3rd port 3 through transmiting；Can be through anti-by the incident light of second port 2
Penetrate and left by the 3rd port 3, and left through transmiting by the 4th port 4.
As shown in Figure 2 A, the first main laser 11 and the second main laser 12 connect the first of the first beam splitter 141 respectively
Port 1 and second port 2.Light is formed between 4th port 4 of the first beam splitter 141 and the 4th port 4 of the second beam splitter 142
Connection is learned, optics connection is formed between the 3rd port 3 of the first beam splitter 141 and the 3rd port 3 of the second beam splitter 142, and
Light path between two the 4th ports 4 is different from the light path between two the 3rd ports 3 so that by the of the first beam splitter 141
The segment pulse of three and the 4th port output reaches the third and fourth end of the second beam splitter 142 on different time locations
Mouthful.The segment pulse inputted by the third and fourth port of the second beam splitter 142 is by the first port 1 of the second beam splitter 142
Output, the first port 1 of the second beam splitter 142 connect the port 1 of optical transmission components 15, while the end of optical transmission components 15
Mouthfuls 2 connections are from laser 13, so that the segment pulse for exporting the first port 1 of the second beam splitter 142 is transmitted to from laser
In 13, for exciting from laser pulse.
In this light-source structure, those skilled in the art will be it will be appreciated that the port 3 of optical transmission components 15 will be outside
Output is from laser pulse, so as to form the output port of light source.Meanwhile first beam splitter 141, the second beam splitter 142 and it
Between light path effectively form unequal arm interferometer 14, it is used to an input pulse being divided into continuous two segment pulses
Output.
In embodiment, the first optical transmission components 15 can be circulator or beam splitter.
The operation principle of light source is illustrated with reference to Fig. 2 B.In the present embodiment, main laser pulse is passed through
Arm interferometer 14 is divided into continuous two segment pulses, and the two segment pulses are injected on different time position from laser
13.By the relative time delay for adjusting master and slave laser so that within a system cycle, the two arteries and veins of main laser pulse
Rushing one in part can cover from one in laser 13 from laser pulse, separately on first (the 3rd) time location
One can cover on second (the 4th) time location from another in laser 13 from laser pulse, so as to make respectively
For seed light inject lock by way of on predetermined time location from laser excitation produce accordingly from laser
Device pulse.The two on different time position will export from laser pulse at the port 3 of optical transmission components 15,
So as to provide the output pulse of light source.
In the embodiment, the working frequency of main laser can be system frequency；In addition, require nothing more than main laser pulse
Width is more than or equal to a width from laser pulse, and the width without main laser pulse can be covered under X basic vectors
Continuous two from laser pulse, therefore the requirement to main laser performance is relatively low.
When Z basic vectors to be carried out encode, within a system cycle, appointing in the first and second main lasers can be selected
One output main laser pulse with to from laser provide two main laser segment pulses.Also, by from source driving signal
Random output first and second is from one in drive signal, to drive from laser so that correspondingly in very first time position
Or second on time location, generated under excitation of the laser in the main laser segment pulse of injection in a manner of injecting and locking
One first from laser pulse or one second from laser pulse.Therefore, first or second from the defeated of laser pulse
Going out the time corresponds respectively to the first or second time location.Therefore, have the first and the of each different output time feature
Two can be used directly to represent different time encodings from laser pulse, for example, when light source within a system cycle it is only defeated
Go out first from laser pulse when, first may be used to indicate that the thang-kng and second on very first time position from laser pulse
The phenomenon of delustring on time location, you can be used to represent time encoding 1；The only output the within a system cycle when light source
Two from laser pulse when, second may be used to indicate that delustring and the second time on very first time position from laser pulse
The phenomenon of thang-kng on position, you can be used to represent time encoding 0；Vice versa.
When X basic vectors to be carried out encode, within a system cycle, one in the first and second main lasers can be selected
It is individual to export main laser pulse to provide two main laser segment pulses to from laser.Within a system cycle, from drive
Dynamic signal source output the 3rd is from drive signal so that from laser on the third and fourth time location in the main laser of injection
Two the 3rd are generated under the excitation of segment pulse from laser pulse, the two the 3rd from laser pulse through optical transmission components
Output, so as to provide continuous two pulses with predetermined time interval.Due within a system cycle, injecting from laser
Two seed lights be two segment pulses being divided to by a main laser pulse through beam splitter, therefore the two seed lights
With identical wavelength characteristic and fixed phase relation, correspondingly, continuous two the 3rd of light source final output from swashing
There is also fixed phase relation between light device pulse.Further, those skilled in the art are it will be appreciated that when selection first
When main laser 11 exports main laser pulse, there will be one between two segment pulses exported via unequal arm interferometer 14
The phase difference △ θ of individual fixation, correspondingly between continuous two pulses (i.e. two from laser pulse) of light source output there is also
Corresponding fixed skew △ Φ；When selecting the output main laser pulse of the second main laser 12, interfere via unequal arm
There will be the phase difference △ θ+π that another is fixed between two segment pulses that instrument 14 exports, correspondingly light source output is continuous
There is also corresponding fixed skew △ Φ+π between two pulses (i.e. two from laser pulse).Continuous two exported
The difference of this π phases on phase difference between individual pulse can be used in the different coding represented under X basic vectors, such as have
Continuous two pulses for having fixed skew △ Φ can be used to indicate the phase code 0 under X basic vectors, have fixed skew
△ Φ+π continuous two pulses can be used to indicate the phase code 1 under X basic vectors.
In brief, two eigenstates of X basic vectorsCoding can by control touch
Sending out main laser corresponding lights to realize.For example, prepare phase statesWhen, the master of triggering first can be selected to swash
Light device 11；And in phase states to be preparedWhen, then it can select to trigger the second main laser 12.
For two eigenstates of Z basic vectors | t0>、|t1>Coding, any one main laser can be triggered and lighted, and led to
Cross corresponding time location of the control out of laser a system cycle and only export a light pulse to realize, such as only preceding
One is exported on one time location from laser pulse, or only on the latter time location export one from laser pulse.
As can be seen here, under the light-source structure of the embodiment, the pulse under the X basic vectors that light source is provided without passing through phase again
Phase code can be achieved in the phase-modulation of position modulator.
<Embodiment two>
Fig. 3 A show the second exemplary embodiment according to light-pulse generator of the present utility model, and it is the light source to Fig. 2A
The further improvement of structure.As shown in Figure 3A, the light source of second embodiment adds the 3rd compared with the light source of first embodiment
Main laser 10, and the 3rd main laser 10 is configured to connect the second port 2 of the second beam splitter 142, so as to by not
3rd main laser pulse is divided into two segment pulses to be injected separately into the first and second main lasers by equiarm interferometer 14.
In this way, the first and second main lasers can be based on the seed light that the 3rd main laser exports in the side of injection locking
Worked under formula, so that the first and second main lasers there can be identical wavelength characteristic, solve two main lasers certainly
By exciting the problem of output wavelength is inconsistent under mode of operation.
With reference to Fig. 3 B, it should be readily apparent to one skilled in the art that subsequently by the first main laser 11, the second main laser 12
Realize that the principle that X basic vectors and Z basic vectors encode is similar to first embodiment with from laser 13, therefore will not be described in great detail.
Compared with first embodiment, the light source of second embodiment can be further improved in consistent wavelength, this
Sample can improve the interference contrast of the decoding of X basic vectors, so as to reduce the decoded bit error rate of X basic vectors.
<Embodiment three>
Fig. 4 A show the 3rd exemplary embodiment according to light-pulse generator of the present utility model, and it is also the light to Fig. 2A
The further improvement of source structure.As shown in Figure 4 A, the light source of 3rd embodiment adds compared with the light source of first embodiment
Three main lasers 10 and the second optical transmission components 16.
Optical transmission components 16 can be arranged on the long-armed or galianconism of unequal arm interferometer 14, including three port 1-
3 and it is configured to：The light entered from first port 1 can leave from second port 2, and the light entered from second port 2 can be from
Leave 3rd port 3.
3rd main laser 10 can be configured to connect the first port 1 of the second optical transmission components 16 so that the 3rd
Second port 2 of the main laser pulse through the second optical transmission components 16 exports, and the first beam splitter 141 is divided into two
Segment pulse is to be injected separately into the first and second main lasers.In this way, the first and second main lasers being capable of base
Worked in the seed light of the 3rd main laser output under the mode of injection locking, so that the first and second main laser energy
Enough there is identical wavelength characteristic, solve the problems, such as that two main lasers freely excite output wavelength under mode of operation inconsistent.
With reference to Fig. 4 B, it should be readily apparent to one skilled in the art that subsequently by the first main laser 11, the second main laser 12
Realize that the principle that X basic vectors and Z basic vectors encode is similar to first embodiment with from laser 13, therefore will not be described in great detail.
Compared with first embodiment, the light source of 3rd embodiment can be further improved in consistent wavelength, this
Sample can improve the interference contrast of the decoding of X basic vectors, so as to reduce the decoded bit error rate of X basic vectors；It is meanwhile real compared to second
Apply example, it is possible to increase the utilization rate of the power output of the 3rd main laser 10, reduce the power requirement to the 3rd main laser.
<Example IV>
Fig. 5 shows the 4th exemplary embodiment according to light source of the present utility model, and the light source can include the first master
Laser 21, the second main laser 22, first are from laser 23, second from laser 24, the first beam splitter 25, the second beam splitter
26th, the first optical transmission components 27 and the second optical transmission components 28.
Optical transmission components 27,28 can include three port 1-3 and be configured to：The light entered from first port 1 can
To be left from second port 2, the light entered from second port 2 can leave from the 3rd port 3.
Beam splitter 25,26 can include first to fourth port 1-4, wherein can be through anti-by the incident light of first port 1
Penetrate and left by the 4th port 4, and left through transmiting by the 3rd port 3；Can be through reflection by the by the incident light of second port 2
Three ports 3 are left, and are left through transmiting by the 4th port 4.
As shown in figure 5, the first main laser 21 and the second main laser 22 connect the first end of the first beam splitter 25 respectively
Mouth 1 and second port 2.Port 1 and port 2 of 4th port 4 of the first beam splitter 25 through the first optical transmission components 27 connect
First connects from laser 23, port 1 and port 2 of the 3rd port 3 through the second optical transmission components 28 of the first beam splitter 25
Second from laser 24.First connects the second beam splitter from port 2 of the laser 23 through the first optical transmission components 27 and port 3
26 second port 2, second connects the second beam splitter from port 2 of the laser 24 through the second optical transmission components 28 and port 3
26 first port 1.3rd port 3 of the second beam splitter 26 uses as the output port of light source.Preferably, the second beam splitter
26 could alternatively be polarization beam apparatus, so that the light pulse of the light source output can be used for carrying out efficiently encoding and decoding.
The first beam splitter 25, first is sequentially connected to be set from the light path of the light path of the beam splitter 26 of laser 23 and second
It is set to different from being sequentially connected the first beam splitter 25, second from the light path of the light path of the beam splitter 26 of laser 24 and second.
In this embodiment, main laser pulse acts on through the first beam splitter 25, respectively through reflect and transmission effect be divided into
Two segment pulses, the two segment pulses are injected separately into accordingly from laser through different light paths.For example, pulse all the way
Part is injected into first from laser 23 through the first optical transmission components 27, and another way segment pulse is through the second optical transmission components
28 are injected into second from laser 24.By the relative time delay for adjusting master and slave laser so that within a system cycle,
One in the two segment pulses of main laser pulse can cover first from laser on first (the 3rd) time location
From laser pulse, another can cover second from one in laser on second (the 4th) time location by one in device
It is individual from laser pulse, so as to respectively as seed light by way of injecting and locking on predetermined time location from laser
Excitation is produced accordingly from laser pulse in device.First from one of laser output from laser pulse and second from laser
One of device output is finally coupled into from laser pulse at the second beam splitter 26 to be exported all the way, there is provided the output arteries and veins of light source
Punching.
In the embodiment, the working frequency of main laser can be system frequency, and can be with from the working frequency of laser
It is identical with main laser；In addition, the width for requiring nothing more than main laser pulse is more than or equal to a width from laser pulse,
Width without main laser pulse can cover continuous two under X basic vectors from laser pulse, therefore to main laser
The requirement of performance is relatively low.
When Z basic vectors to be carried out encode, within a system cycle, appointing in the first and second main lasers can be selected
One output main laser pulse with to from laser provide two main laser segment pulses.Also, by from source driving signal
Output first and second is from one in drive signal, to drive first or second from laser so that correspondingly at first
Between on position or the second time location, first or second under excitation of the laser in the main laser segment pulse of injection with note
The mode for entering locking generates one first from laser pulse or one second from laser pulse.Therefore, first or second
The first or second time location is corresponded respectively to from the output time of laser pulse.Therefore, when there is each different output
Between feature first and second can be used directly to represent different time encodings from laser pulse, such as when light source is one
In the individual system cycle only output first from laser pulse when, first may be used to indicate that in the very first time from laser pulse
On position on thang-kng and the second time location delustring phenomenon, you can be used to represent time encoding 1；When light source is at one
Unite the cycle in only output second from laser pulse when, second may be used to indicate that in very first time position from laser pulse
The phenomenon of thang-kng in upper delustring and the second time location, you can be used to represent time encoding 0；Vice versa.
When X basic vectors to be carried out encode, within a system cycle, one in the first and second main lasers can be selected
It is individual to export main laser pulse to provide two main laser segment pulses to from laser.Within a system cycle, from drive
Dynamic signal source output the 3rd is from drive signal so that first from laser on the 3rd time location in the main laser arteries and veins of injection
Rush under the excitation of part and generate one the 3rd from laser pulse, and second is injecting from laser on the 4th time location
Main laser segment pulse excitation under generation one the 3rd from laser pulse, the two the 3rd from laser pulse the
It is coupled at two beam splitters and exports all the way, so as to provides continuous two pulses with predetermined time interval.Due to being at one
Unite in the cycle, be injected separately into two two seed lights from laser and formed by a main laser pulse through beam splitter point
Two segment pulses, therefore the two seed lights have identical wavelength characteristic and fixed phase relation, correspondingly, light
There is also fixed phase relation between laser pulse by continuous two the 3rd of source final output.
Those skilled in the art it will be appreciated that when select the first main laser 21 output main laser pulse when, via
There will be a fixed phase difference △ θ between two segment pulses that first beam splitter is divided into, the correspondingly company of light source output
There is also fixed skew △ Φ accordingly between continuous two pulses (i.e. two from laser pulse)；When selection is by the second master
It is solid there will be another between two segment pulses being divided into via the first beam splitter when laser 22 exports main laser pulse
Fixed phase difference △ θ+π, correspondingly between continuous two pulses (i.e. two from laser pulse) of light source output there is also
Corresponding fixed skew △ Φ+π.The difference of this π phases on phase difference between continuous two pulses exported can
To be used in the different coding represented under X basic vectors, for example, continuous two pulses with fixed skew △ Φ can by with
In representing the phase code 0 under X basic vectors, continuous two pulses with fixed skew △ Φ+π can be used to indicate X bases
Phase code 1 under arrow, vice versa.
Similar to the above embodimentsly, the coding of two eigenstates of X basic vectors can be by controlling the master of triggering first and second
One in laser lights to realize.For the coding of two eigenstates of Z basic vectors, any one main laser can be triggered
It is luminous, and by controlling triggering first and second to be lighted from one in laser to realize.
As can be seen here, under the light-source structure of the embodiment, the pulse under the X basic vectors that light source is provided is again without again
Phase code can be achieved by the phase-modulation of phase-modulator.
Similarly, in this embodiment, optical transmission components can be circulator or beam splitter.
<Embodiment five>
Fig. 6 shows the 5th exemplary embodiment according to light-pulse generator of the present utility model, and it is the light source knot to Fig. 5
The further improvement of structure.As shown in fig. 6, the light source of the 5th embodiment compared with the light source of fourth embodiment, adds the 3rd master
The optical transmission components 29 of laser 20 and the 3rd.
3rd optical transmission components 29 can include three port 1-3 and be configured to：The light entered from first port 1 can
To be left from second port 2, the light entered from second port 2 can leave from the 3rd port 3.
3rd main laser 20 connects the port 1 of the 3rd optical transmission components 29, the port 2 of the 3rd optical transmission components 29
Connect the 3rd port 3 of the first beam splitter 25 so that the 3rd main laser pulse being capable of the end through the 3rd optical transmission components 29
Mouthfuls 2 export, and two segment pulses are divided into by the first beam splitter 25 be injected separately into the first and second main lasers 21,
22.In this way, the first and second main lasers can be locked based on the seed light that the 3rd main laser exports in injection
Mode under work so that the first and second main lasers can have an identical wavelength characteristic, solve two main lasers
Device freely excites the problem of output wavelength is inconsistent under mode of operation.
It will be appreciated by those skilled in the art that subsequently by the first main laser 21, the second main laser 22, first from swash
Light device 23 and second realizes that the process of X basic vectors and Z basic vectors coding is similar to fourth embodiment from laser 24, will no longer go to live in the household of one's in-laws on getting married herein
State.
Compared with fourth embodiment, the light source of the 5th embodiment can be further improved in consistent wavelength, this
Sample can improve the interference contrast of the decoding of X basic vectors, so as to reduce the decoded bit error rate of X basic vectors.
<Embodiment six>
Fig. 7 shows the 6th exemplary embodiment according to light source of the present utility model, and the light source can include the first master
Laser 31, the second main laser 32, first are from laser 33, second from laser 34, the first beam splitter 35 and the first optics
Transfer element 36.
Optical transmission components 36 can include three port 1-3 and be configured to：The light entered from first port 1 can be from
Second port 2 is left, and the light entered from second port 2 can leave from the 3rd port 3.
Beam splitter can include first to fourth port 1-4, wherein can be through reflection by the by the incident light of first port 1
Four ports 4 are left, and are left through transmiting by the 3rd port 3；Can be through reflecting by the 3rd port by the incident light of second port 2
3 leave, and are left through transmiting by the 4th port 4.
As shown in fig. 7, the first main laser 31 connect the first beam splitter 35 first port 1, the second main laser 32 according to
Secondary port 1 and port 2 through the first optical transmission components 36 connect the second port 2 of the first beam splitter 35.First beam splitter 35
The connection first of the 4th port 4 from laser 33, the 3rd port 3 connection second of the first beam splitter 35 is from laser 34.First
The port 3 of optical transmission components 36 uses as the output port of light source.
First beam splitter 35 and first can be configured to be different from the first beam splitter 35 from the light path between laser 33
And second from the light path between laser 34.
In this embodiment, main laser pulse acts on through the first beam splitter, respectively through reflect and transmission effect be divided into two
Individual segment pulse.The two segment pulses are injected separately into accordingly from laser through different light paths.It is master and slave sharp by adjusting
The relative time delay of light device so that within a system cycle, one in the two segment pulses of main laser pulse can
From one in laser from laser pulse, another can be second for covering first on first (the 3rd) time location
Covering second is from one in laser from laser pulse on (the 4th) time location, so as to pass through note respectively as seed light
The mode for entering locking is encouraging generation accordingly from laser pulse on predetermined time location from laser.First from swash
One of light device output is from laser pulse and second from one of laser output from laser pulse finally in the first beam splitting
It is coupled at device and exports all the way, there is provided the output pulse of light source.
In the embodiment, the working frequency of main laser can be system frequency, and can be with from the working frequency of laser
It is identical with main laser；In addition, the width for requiring nothing more than main laser pulse is more than or equal to a width from laser pulse,
Width without main laser pulse can cover continuous two under X basic vectors from laser pulse, therefore to main laser
The requirement of performance is relatively low.
When Z basic vectors to be carried out encode, within a system cycle, appointing in the first and second main lasers can be selected
One output main laser pulse with to from laser provide two main laser segment pulses.Also, by from source driving signal
Random output first and second is from one in drive signal, with driving first or second from laser so that correspondingly the
On one time location or the second time location, first or second from laser the main laser segment pulse of injection excitation
Under one first is generated in a manner of injecting and lock from laser pulse or one second from laser pulse.Therefore, first
Or second correspond respectively to the first or second time location from the output time of laser pulse.Therefore, have each different
The first and second of output time feature can be used directly to represent different time encodings from laser pulse, such as work as light
When only output first is from laser pulse within a system cycle in source, first may be used to indicate that the from laser pulse
On one time location on thang-kng and the second time location delustring phenomenon, you can be used to represent time encoding 1；When light source exists
In one system cycle only output second from laser pulse when, second may be used to indicate that at first from laser pulse
Between on position on delustring and the second time location thang-kng phenomenon, you can be used to represent time encoding 0；Vice versa.
When X basic vectors to be carried out encode, within a system cycle, can randomly choose in the first and second main lasers
An output main laser pulse with to from laser provide two main laser segment pulses.Within a system cycle,
From source driving signal output the 3rd from drive signal so that first from laser on the 3rd time location in the main laser of injection
One the 3rd is generated under the excitation of device segment pulse from laser pulse, and second from laser on the 4th time location
One the 3rd is generated under the excitation of the main laser segment pulse of injection from laser pulse, the two are the 3rd from laser pulse
It is coupled at the first beam splitter and exports all the way, so as to provides continuous two pulses with predetermined time interval.Due to one
In the individual system cycle, be injected separately into two from two seed lights of laser be by a main laser pulse through beam splitter point and
Into two segment pulses, therefore the two seed lights have identical wavelength characteristic and fixed phase relation, accordingly
Ground, there is also fixed phase relation between laser pulse by continuous two the 3rd of light source final output.
Those skilled in the art it will be appreciated that when select the first main laser 31 output main laser pulse when, via
There will be a fixed phase difference △ θ between two segment pulses that first beam splitter is divided into, the correspondingly company of light source output
There is also fixed skew △ Φ accordingly between continuous two pulses (i.e. two from laser pulse)；When selection second, master swashs
When light device 32 exports main laser pulse, there will be another between two segment pulses being divided into via the first beam splitter to fix
Phase difference △ θ+π, correspondingly there is also phase between continuous two pulses (i.e. two from laser pulse) of light source output
The fixed skew △ Φ+π answered.The difference of this π phases on phase difference between continuous two pulses exported can be with
The different coding represented under X basic vectors is used in, such as continuous two pulses with fixed skew △ Φ can be used for
The phase code 0 under X basic vectors is represented, continuous two pulses with fixed skew △ Φ+π can be used to indicate X basic vectors
Under phase code 1, vice versa.
Similar to the above embodimentsly, the coding of two eigenstates of X basic vectors can be by controlling the master of triggering first and second
One in laser lights to realize.For the coding of two eigenstates of Z basic vectors, any one main laser can be triggered
It is luminous, and by controlling triggering first and second to be lighted from one in laser to realize.
As can be seen here, under the light-source structure of the embodiment, the pulse under the X basic vectors that light source is provided is again without again
Phase code can be achieved by the phase-modulation of phase-modulator；Meanwhile the optical element needed under the embodiment is less,
Advantageously reduce the complexity of system.
Similarly, in this embodiment, optical transmission components can be circulator or beam splitter.
<Embodiment seven>
Fig. 8 shows the 7th exemplary embodiment according to light-pulse generator of the present utility model, and it is the light source knot to Fig. 7
The further improvement of structure.As shown in figure 8, the light source of the 7th embodiment compared with the light source of sixth embodiment, adds the 3rd master
Laser 30, the second beam splitter 37 and second and the 3rd optical transmission components 38,39.
The setting of optical transmission components and beam splitter can be identical with described in sixth embodiment, therefore here is omitted.
3rd main laser 30 connects the second beam splitter 37 so that the 3rd main laser pulse can be by the second beam splitter
It is divided into two segment pulses.One in the two segment pulses can be via the port 1 and end of the second optical transmission components 38
Mouthfuls 2 are injected into the first main laser 31, the pulse of the first main laser 31 output via the second optical transmission components 38 port 2
Transmitted with port 3 to the first port 1 of the first beam splitter 35；Another in the two segment pulses can be via the 3rd optics
The port 1 and port 2 of transfer element 39 are injected into the second main laser 32, and the pulse of the second main laser 32 output is via the 3rd
The port 2 and port 3 of optical transmission components 39 are transmitted to the port 1 of the first optical transmission components 36.
In this way, the seed light that the first and second main lasers can be exported based on the 3rd main laser is being injected
Worked under the mode of locking, so that the first and second main lasers there can be identical wavelength characteristic, solve two masters
Laser freely excites the problem of output wavelength is inconsistent under mode of operation.
It will be appreciated by those skilled in the art that subsequently by the first main laser 31, the second main laser 32, first from swash
Light device 33 and second realizes that the process of X basic vectors and Z basic vectors coding is similar to sixth embodiment from laser 34, will no longer go to live in the household of one's in-laws on getting married herein
State.
Compared with sixth embodiment, the light source of the 7th embodiment can be further improved in consistent wavelength, this
Sample can improve the interference contrast of the decoding of X basic vectors, so as to reduce the decoded bit error rate of X basic vectors.
<Code device>
Another aspect of the present utility model also proposed a kind of coding dress that can carry out time encoding and phase code simultaneously
Put, the code device is included according to light source of the present utility model, and it is used for the output under X basic vectors and closed with set time and phase
The two neighboring light pulse of system, and export under Z basic vectors one in two neighboring light pulse.Alternatively, the code device
Intensity modulator can also be included, it is used to adjust the overall strength of the two neighboring light pulse under X basic vectors, and under Z basic vectors it is defeated
The relation between the intensity of one in the two neighboring light pulse gone out, and signal state, trick state, vacuum state equal strength, with
Meet non-equilibrium basic vector and inveigle state encoding scheme.
Need not be set compared with the code device of prior art, in code device of the present utility model phase-modulator and
The modulation of high-precision main laser modulated signal, and without extra feedback mechanism, can be achieved with precision it is high and stable when
Between coding and phase code, structure is more simple, and can be used for efficiently decoding；Simultaneously as light source offer is used to encode
Light pulse consistent wavelength it is more preferable, therefore the code device can have it is higher into code check and stability.
<Decoding apparatus>
Another aspect of the present utility model also proposed a kind of code device for being applied to include light source of the present utility model
Decoding apparatus.As shown in figure 9, decoding apparatus can include basic vector selecting unit 41, time basic vector decoding unit 42 and phase
Basic vector decoding unit 43.
Basic vector selecting unit 41 can be used for basic vector pulse input to time basic vector decoding unit according to predetermined probabilities
42 and phase basic vector decoding unit 43 in one.
Time basic vector decoding unit 42 can include the first photodetector 421 and time basic vector lsb decoder.Wherein, photoelectricity
Detector 421 detects to basic vector pulse, and time basic vector lsb decoder receives the result of detection that photodetector 421 exports and evidence
This carries out time basic vector decoding.
Phase basic vector decoding unit 43 can include unequal arm interferometer 431, the second photodetector 432, the 3rd photoelectricity
Detector 433 and phase basic vector lsb decoder.
Wherein, unequal arm interferometer 431 can be Michelson's interferometer or Mach Zeng De (MZ) interferometer, for making
Continuous two pulse shapings obtained under phase basic vector are interfered and export result of interference.For example, unequal arm interferometer 431 can include
First polarization-maintaining beam splitting element 4311, the second polarization-maintaining beam splitting element 4312 and the long-armed and galianconism to fall between, wherein long-armed
The time interval that arm length difference between galianconism can be configured between continuous two pulses under phase basic vector is consistent.
The result of interference that second photodetector 432 and the 3rd photodetector 433 export to unequal arm interferometer 431 is entered
Row detection, and export result of detection.The result of detection that phase basic vector lsb decoder exports according to photodetector 432,433 carries out phase
The decoding of position basic vector.
In the preferred embodiment of decoding apparatus, the first beam splitting element 4311 can be polarization beam apparatus PBS, correspondingly not
Equiarm interferometer is polarization beam apparatus-beam splitter (PBS-BS) type.The decoding apparatus of the preferred embodiment is especially suitable for and can
The code device for making the polarization direction of two under X basic vectors pulses perpendicular to one another is used cooperatively, therefore, in the preferred embodiment
In, unequal arm interferometer can be set such that previous pulse in continuous two pulses under X basic vectors along long-armed transmission,
The latter pulse is transmitted along galianconism, so as to avoid due to time misaligned caused energy loss, it is thus possible to realize efficient
Phase decoding.
<Quantum key distribution system based on time phase coding>
Further aspect of the present utility model also proposed a kind of quantum key distribution system based on time phase coding, should
System can be included according to one or more in light source of the present utility model, code device and decoding apparatus.
Described above is only embodiment of the present utility model, it should be pointed that is come for one of ordinary skill in the art
Say, on the premise of the utility model technical principle is not departed from, some improvement and modification can also be made, these improvement and modification
Also it should be regarded as the scope of protection of the utility model.
Claims (22)
1. a kind of light source that can be used for time encoding and phase code simultaneously, it includes：
Main laser, the driving of its main drive signal provided within a system cycle based on main source driving signal export one
Main laser pulse, for forming seed light；
From laser, its based on the driving from drive signal provided from source driving signal under the excitation of the seed light with note
The mode for entering locking is exported from laser pulse, for encoded signal light pulse；
It is described to include first, second, and third from drive signal from drive signal, and within a system cycle, described first,
Second and the 3rd randomly exported from one in drive signal it is described from laser to drive；Wherein, described first from
It is described that one first is only exported from laser from laser pulse within a system cycle under the driving of drive signal, and institute
State the first segment pulse excitation positioned at very first time position that a main laser pulse is derived from from laser pulse
's；Under the described second driving from drive signal, within a system cycle, it is described only exported from laser one second from
Laser pulse, and described second is located at the second time location from what laser pulse was derived from main laser pulse
Segment pulse excitation；And under the 3rd driving from drive signal, it is described from sharp within a system cycle
Continuous two the 3rd of light device output is from laser pulse, and described two three from laser pulse come from respectively described in one
The segment pulse excitation for being located at the 3rd time location and the 4th time location of main laser pulse；
Characterized by further comprising the first beam splitter；
The main laser includes the first main laser and the second main laser；And
First beam splitter includes first port, second port, the 3rd port and the 4th port, and is configured to, via institute
State first port and receive the first main laser pulse of first main laser output to be divided into first main laser
Two segment pulses of device pulse, and respectively via the 3rd port and the 4th port by the first main laser arteries and veins
Described two segment pulses of punching are exported to described from laser；And receive second main laser via the second port
Second main laser pulse of device output is passed through respectively with being divided into two segment pulses of the second main laser pulse
By the 3rd port and the 4th port by described two segment pulses of the second main laser pulse export to it is described from
Laser.
2. light source as claimed in claim 1, the 3rd port of first beam splitter and described from light between laser
The 4th port and the light path from light path between laser of the light path on road and first beam splitter are configured to not
Together so that described two segment pulses enter described from laser on different time locations.
3. light source as claimed in claim 2, wherein being provided with the adjustable time between laser and the beam splitter described
Delay cell.
4. light source as claimed in claim 1, wherein the very first time position is identical with the 3rd time location, described
Two time locations are identical with the 4th time location.
5. light source as claimed in claim 1, it also includes the second beam splitter, first beam splitter and second beam splitter
It is used to form unequal arm interferometer.
6. light source as claimed in claim 5, wherein, the unequal arm interferometer and described from being provided with the first light between laser
Transfer element is learned, first optical transmission components include three transmission ports.
7. the light source as described in claim 5 or 6, it also includes the 3rd main laser, and the 3rd main laser is set
It is connected into second beam splitter so that the 3rd main laser pulse of the 3rd main laser output is through the unequal arm
Interferometer is divided into two segment pulses to be injected separately into first main laser and second main laser.
8. the light source as described in claim 5 or 6, it also includes the 3rd main laser and the second optical transmission components, wherein, institute
State the second optical transmission components to be arranged on the long-armed or galianconism of the unequal arm interferometer, and connect the 3rd main laser
Device so that the 3rd main laser pulse of the 3rd main laser output is divided into two segment pulses to divide through the beam splitter
First main laser and second main laser are not injected into.
9. light source as claimed in claim 1, wherein, it is described to include first from laser and second from laser from laser,
Described first is configured to receive the output of the 4th port of first beam splitter from laser, and described second from laser
Device is configured to receive the output of the 3rd port of first beam splitter.
10. light source as claimed in claim 9, wherein, first beam splitter and described first is additionally provided between laser
First optical transmission components, first beam splitter and described second from being additionally provided with the second optical transmission components between laser,
And the optical transmission components include three transmission ports；And
Described first from laser via first optical transmission components and described second from laser via second light
Learn transfer element and connect the second beam splitter respectively.
11. light source as claimed in claim 10, wherein, second beam splitter is polarization beam apparatus.
12. such as the light source any one of claim 9-11, it also includes the 3rd main laser, the 3rd main laser
First beam splitter is connected via the 3rd optical transmission components so that the 3rd main laser of the 3rd main laser output
Pulse is divided into two segment pulses to be injected separately into first main laser and second master through first beam splitter
Laser.
13. light source as claimed in claim 1, wherein, it is described to include first from laser and second from laser from laser,
Described first connects the 4th port of first beam splitter and described from laser and described second from laser respectively
3rd port, and one in first, second main laser is additionally provided with the first optics biography between first beam splitter
Defeated element, the optical transmission components include three transmission ports.
14. light source as claimed in claim 13, it also includes the 3rd main laser, and the 3rd main laser connects second point
Beam device so that the 3rd main laser pulse of the 3rd main laser output is divided into two pulse portions through second beam splitter
Divide to be injected separately into first main laser and second main laser.
15. light source as claimed in claim 14, wherein, second beam splitter, first main laser and described first
Connected between beam splitter by the second optical transmission components, second beam splitter, second main laser and described first
Connected between optical transmission components by the 3rd optical transmission components.
16. a kind of code device available for phase code without phase-modulator, it is included as appointed in claim 1-14
Light source described in one.
17. code device as claimed in claim 16, it still further comprises intensity modulator, and the intensity modulator is used for
Described first is modulated from laser pulse, second from laser pulse, the 3rd from the relative light intensity between laser pulse.
18. a kind of decoding apparatus, it is used to encode the time phase that the code device as described in claim 16 or 17 is sent
Being decoded, the decoding apparatus includes basic vector selecting unit, time basic vector decoding unit and phase basic vector decoding unit, its
In, the basic vector selecting unit is configured to be decoded the basic vector pulse input of reception to the time basic vector according to predetermined probabilities
One in unit and the phase basic vector decoding unit.
19. decoding apparatus as claimed in claim 18, wherein, the phase basic vector decoding unit includes unequal arm interferometer.
20. decoding apparatus as claimed in claim 19, wherein, the unequal arm interferometer includes polarization beam apparatus, beam splitter
And the long-armed and galianconism to fall between, the polarization beam apparatus are configured to make in continuous two pulses under phase basic vector
Previous pulse transmitted along the long-armed transmission, the latter pulse along the galianconism.
21. a kind of quantum key distribution system based on time phase coding, it is included such as any one of claim 1-15 institutes
The light source stated.
22. a kind of quantum key distribution system based on time phase coding, it is included such as any one of claim 18-20 institutes
The decoding apparatus stated.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018121053A1 (en) * | 2016-12-26 | 2018-07-05 | 科大国盾量子技术股份有限公司 | Light source for quantum communication system, and encoding device |
| CN108933661A (en) * | 2017-05-26 | 2018-12-04 | 科大国盾量子技术股份有限公司 | Time phase without phase-modulator encodes quantum key distribution system and its component |
-
2017
- 2017-05-26 CN CN201720613066.7U patent/CN206775514U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018121053A1 (en) * | 2016-12-26 | 2018-07-05 | 科大国盾量子技术股份有限公司 | Light source for quantum communication system, and encoding device |
| US10972187B1 (en) | 2016-12-26 | 2021-04-06 | Quantumctek Co., Ltd. | Light source for quantum communication system, and encoding device |
| CN108933661A (en) * | 2017-05-26 | 2018-12-04 | 科大国盾量子技术股份有限公司 | Time phase without phase-modulator encodes quantum key distribution system and its component |
| CN108933661B (en) * | 2017-05-26 | 2023-08-22 | 科大国盾量子技术股份有限公司 | Time-phase coded quantum key distribution system without phase modulator and components thereof |
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