CN204231375U - A kind of synchronizer of quantum key distribution system - Google Patents
A kind of synchronizer of quantum key distribution system Download PDFInfo
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- CN204231375U CN204231375U CN201420531615.2U CN201420531615U CN204231375U CN 204231375 U CN204231375 U CN 204231375U CN 201420531615 U CN201420531615 U CN 201420531615U CN 204231375 U CN204231375 U CN 204231375U
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Abstract
The utility model provides a kind of synchronizer of quantum key distribution system, this quantum key distribution system is duplexing QKD system, comprise the synchronizable optical laser that can send the synchronizable optical of two kinds of different wave lengths respectively of the Alice of the QKD equipment being configured in QKD system two ends respectively, the Bob of the QKD equipment at QKD system two ends is all configured with discriminator, adopts corresponding discriminator to screen synchronizable optical.The utility model has the advantage of: the required device cost increased of system equipment is lower, and structurally can realize QKD equipment _ identical feature of L and QKD equipment _ R, reach any two QKD equipment and all can realize point to point connect and the function communicated, equipment operating is simple and convenient, is convenient to batch production.
Description
Technical field
The utility model relates to field of quantum secure communication, in particular, provides a kind of synchronizer of quantum key distribution system.
Background technology
Quantum key distribution (Quantum Key Distribution, QKD) be with the fundamental difference of classic key system, it adopts single photon or entangled photon pairs as the carrier of key, by quantum-mechanical general principle ensure that can not the eavesdropping of this process, can not the property decoded, thus provide a kind of safer key code system.At present, the technology utilizing entangled photon pairs to realize quantum key distribution is not also very ripe, and distance is practical also has suitable distance; And based on the quantum key distribution technology that single photon realizes, then ripe day by day.
The quantum key distribution technology realized based on single photon has two kinds of coded systems usually: polarization encoder and phase code.In polarization encoder mode, the basic process of quantum key distribution is:
1) system transmit leg (agreement is called Alice) selects two groups of basic vectors, a string photon with different polarization states of random transmission;
2) system acceptance side's (agreement is called Bob) selects at random and measures basic vector and receive, and due to the problem of detection efficient and path attenuation, Bob can not detect all photons, can only be random detect photon in some locations;
3) Bob notify Alice he on the position detecting photon, use any basic vector;
4) basic vector used when Alice contrasts the basic vector and Bob measurement that use when oneself sends, if the basic vector that both use at certain position place is consistent, namely the basic vector used when Bob measures is correct, then retain the information on this position, and tell Bob that the measurement basic vector that he uses on which position is correct;
5) Bob leaves the information measured on the correct position of basic vector;
6) Alice and Bob just have shared a string random key like this.
As can be seen from said process, in the process of quantum key distribution, Alice and Bob needs to carry out basic vector comparison, and namely comparison Alice sends on some positions whether the measurement basic vector that basic vector that photon uses and Bob use when detecting the photon of this position is consistent.In order to ensure that Alice and Bob carries out basic vector comparison on same position, need accurate " position " synchronous between transmit leg and recipient, otherwise the key at final Alice and Bob two ends there will be inconsistent phenomenon.So the synchronous method of system just seems and is even more important.
Above-mentioned " position ", the description of image is exactly which pulse in one group of light pulse.At transmitting terminal, the light pulse of flashlight sends continuously with fixed frequency, have fixing time slot, and the light pulse of synchronizable optical sends continuously with the fixed frequency more much lower than flashlight transmission frequency between adjacent two light pulses.When flashlight and synchronizable optical send simultaneously, the continuously flashlight sent between two synchronizable optical pulses is one group of light pulse.Receiving terminal receive continuously flashlight time, by detecting the signal pulse between two synchronizable optical pulses, one group of light pulse can be determined.Described " position " information, namely by which pulse signal in one group of signal pulse is determined.Owing to having fixing time slot between adjacent two signal pulses, above-mentioned " position " is also temporal information.
Fig. 1 represents the synchronous method of prior art.The method of QKD system synchronization is, the Alice of QKD equipment sends synchronizable optical, and Bob receives synchronizable optical and completes examination, produces synchronizing signal.Quantum channel in system only has an optical fiber, and namely flashlight and synchronizable optical are transmitted in same optical fiber.
In the realization of QKD system, Alice may comprise N number of flashlight laser (concrete quantity is depending on adopted QKD coding protocol) and a synchronizable optical laser, and the wavelength of flashlight is λ
signal, the wavelength of synchronizable optical is λ
sync, and λ
signal≠ λ
sync, these two kinds are optically coupled in same optical fiber, are transferred to Bob end by optical fiber link.Bob end comprises an optical filter part, and such as dense wavelength division multiplexing (DWDM) device, its centre wavelength is λ
signal, flashlight and synchronizable optical can be separated, then the flashlight separated be done corresponding subsequent treatment, the synchronizable optical separated be sent in synchronizable optical discriminator and screens.The signal that discriminator is screened out as synchronizing signal, for flashlight subsequent processes.
Based on unidirectional (one-way) of the existing method of synchronization, duplexing QKD system as shown in Figure 2, every platform equipment all comprises transmitting terminal Alice and receiving terminal Bob, can set up two QKD links between two QKD equipment simultaneously.Article two, QKD link respectively: the Bob link setup of Alice and the QKD equipment _ R of QKD equipment _ L; The Bob link setup of Alice and the QKD equipment _ L of QKD equipment _ R.The synchronizable optical sent by the synchronizable optical laser of the Alice of QKD equipment _ L, after optical fiber link transmission, is screened by the synchronizable optical discriminator of the Bob of QKD equipment _ R; The synchronizable optical sent by the synchronizable optical laser of the Alice of QKD equipment _ R, after optical fiber link transmission, is screened by the synchronizable optical discriminator of the Bob of QKD equipment _ L.
As can be seen from prior art, traditional based on synchronous duplexing QKD system, the synchronizable optical that the Alice of Alice with the QKD equipment _ R of its QKD equipment _ L sends is that wavelength is identical.
In the middle of this area, be defined as " two-way QKD system ", this refers in the implementation of QKD, and flashlight is sent to the 2nd QKD end from a QKD end, returns a QKD end subsequently along original optical path.In general, the flashlight issuing the 2nd QKD end from a QKD end is stronger, average each pulse hundreds of or several thousand photons, and before returning to a QKD end, be attenuated to single photon magnitude (average each pulse photon or less) at the 2nd QKD end.The optical fiber link of system only having a QKD link, is the process of two-way (two-way), single work.
Documents is as " having the two-way QKD system that back scattering suppresses " (patent No. is 200580025415.3) of MAGIQ Technologies Inc., its QKD station has with the lasing light emitter of different wavelength luminescences, and multiple single-photon detector (SPD) unit.In two-way QKD system, produce in the optical fiber link that rear orientation light is generally stood at connection first and second QKD by stronger output signal light.In order to reduce or avoid rear orientation light to disturb the detection of the flashlight returning to a QKD station from the 2nd QKD station, when each pair SPD of this patent in Sequential Activation the one QKD stands in SPD unit, the light source that Sequential Activation is different.This patent is to be solved is the problem that in two-way QKD system, the detection of flashlight is subject to rear orientation light interference, and it is higher to the requirement of related Control System, need the length according to actual fiber link, calculate the Expected Arrival Time of flashlight, the active control of different light sources, SPD unit is carried out at Expected Arrival Time, control precision requires high, and the process lasts of this Sequential Activation carries out.
When existing synchronous method is applied to unidirectional (one-way), duplex system, as shown in Figure 2, the synchronizable optical wavelength that the Alice of Alice and the QKD equipment _ R of QKD equipment _ L sends is identical, and transmits in same optical fiber.Because actual fiber chain environment is undesirable, there is fiber end face reflex.Such as, after the Bob link startup of Alice and the QKD equipment _ R of QKD equipment _ L, may reflex be there is in the synchronizable optical that the Alice of QKD equipment _ L sends, its reverberation enters the Bob of QKD equipment _ L, thus causes the synchronizing signal in the Bob link of Alice and the QKD equipment _ L of QKD equipment _ R to be screened by mistake; Like this after the Bob link startup of Alice and the QKD equipment _ L of QKD equipment _ R, the synchronizable optical that the Alice of QKD equipment _ R sends can be interfered, and causes system normally not run.
Utility model content
The utility model provides a kind of synchronizer of quantum key distribution system, wavelength for the Alice synchronizable optical solving Alice and the QKD equipment _ R due to QKD equipment _ L in duplexing QKD system is identical, and the synchronizable optical caused reflects the problem that will two QKD links caused simultaneously not run.
The utility model solves the problems of the technologies described above by the following technical solutions: a kind of synchronizer of quantum key distribution system, this quantum key distribution system is duplexing QKD system, comprise the synchronizable optical laser of the Alice of the QKD equipment being configured in QKD system two ends respectively, the synchronizable optical laser of the QKD equipment at QKD system two ends can send the synchronizable optical of two kinds of different wave lengths respectively, and the Bob of the QKD equipment at QKD system two ends is all configured with discriminator, corresponding discriminator is adopted to screen synchronizable optical.
Concrete apparatus structure can be following any one:
1, the synchronizable optical laser of the Alice of the QKD equipment at QKD system two ends all has two, two synchronizable optical lasers can send different wavelength, and the Bob of the QKD equipment at QKD system two ends is all configured with the discriminator that optical filter part and two kinds can screen two kinds of different wave lengths that synchronizable optical laser sends respectively, isolated synchronizable optical is sent among corresponding discriminator and is screened by optical filter part.
Because actual fiber chain environment is undesirable, there is fiber end face reflex, article one, QKD active link may exist the different synchronizable optical of two-way wavelength, the wherein synchronizable optical of a kind of synchronizable optical of wavelength and the another kind of wavelength of reflection, after optical filter part, among corresponding discriminator of being made a gift to someone respectively.Such as, the centre frequency of optical filter part is λ
1(this centre frequency is generally fixed value), when use wavelength is λ
1synchronizable optical time, then after optical filter part, send in discriminator 1 and screen; When use wavelength is λ
2synchronizable optical time, then after optical filter part, except λ
1other light signal in addition is all sent in discriminator 2 and is screened, and the examination impact of the interference such as the noise in optical fiber link on synchronizable optical is very little, negligible, and therefore correctly can screen out wavelength is λ
2synchronizable optical.(process of " isolated synchronizable optical sent among corresponding discriminator and screen " of mentioning in following content all refers to this process)
In this kind of structure, configuration control module is gone back in described duplexing QKD system, the synchronizable optical laser of the QKD equipment at control module control QKD system two ends sends the synchronizable optical of any wavelength respectively, and the signal which kind of discriminator detects by Bob that control module also control the QKD equipment at two ends is respectively as synchronizing signal.
Or the signal which kind of discriminator detects by Bob that the synchronizable optical laser of the QKD equipment at QKD system two ends sends the synchronizable optical of any wavelength and the QKD equipment at two ends respectively, as synchronizing signal, determines through system initial configuration.
2, the Alice of the QKD equipment at QKD system two ends is all furnished with the synchronizable optical laser of a Wavelength tunable, the synchronizable optical laser of this Wavelength tunable can send the different synchronizable optical of two kinds of wavelength, and the Bob of the QKD equipment at QKD system two ends is all configured with the discriminator that optical filter part and two kinds can screen two kinds of different wave lengths that synchronizable optical laser sends respectively, isolated synchronizable optical is sent among corresponding discriminator and is screened by optical filter part.
In this kind of structure, configuration control module is gone back in described duplexing QKD system, the synchronizable optical that the synchronizable optical laser of the Wavelength tunable of the Alice of the QKD equipment at two ends sends any wavelength is respectively dispatched by control module, and the signal which kind of discriminator detects by Bob that control module also control the QKD equipment at two ends is respectively as synchronizing signal.
Or the signal which kind of discriminator detects by Bob that the synchronizable optical laser of the Wavelength tunable of the QKD equipment at QKD system two ends sends the synchronizable optical of any wavelength and the QKD equipment at two ends respectively, as synchronizing signal, determines through system initial configuration.
3, the synchronizable optical laser that the Alice of the QKD equipment at described QKD system two ends is furnished with is the synchronizable optical laser of a fixed wave length, the wavelength that the synchronizable optical laser at two ends sends is different, and the Bob of the QKD equipment at QKD system two ends is all configured with the discriminator can fixed and screen the wavelength received.
It should be noted that " two-way QKD system " in " the duplexing QKD system " concept that the utility model uses and documents is not same concept.
What propose in documents " have back scattering suppress two-way QKD system " is a kind of implementation of QKD, is not the synchronous method of system.In this documents, the definition of " bilateral system " is that the QKD equipment (Bob) of system one end sends stronger flashlight, transfer to the QKD equipment (Alice) of the system other end, after flashlight is decayed to single photon magnitude by Alice, flashlight is back to Bob again by original optical path, and light path is a round process.Optical fiber link in whole process between two QKD equipment only having a QKD active link, is the process of two-way (two-way), single work.
And in the utility model patent application " duplex system " be defined as can " full duplex " system of working, every one end of duplex system all contains Alice and Bob, can set up two QKD links simultaneously.Weak signal light (single photon magnitude) can transfer to the receiving terminal Bob of QKD equipment _ R from the transmitting terminal Alice of QKD equipment _ L, also can transfer to the Bob (Fig. 4) of QKD_L from the Alice of QKD equipment _ R simultaneously.Like this, can run two QKD active links between the two ends QKD equipment of duplex system on optical fiber link, be the process of unidirectional a, full duplex simultaneously.Very large difference is there is in " bilateral system " of this and documents in structure and optical signal transmission.
The utility model has the advantage of:
1, according to embodiment one and embodiment two, compare original QKD system, its QKD equipment only need increase a synchronizable optical laser at Alice end more, or Alice uses the synchronizable optical laser of Wavelength tunable, reaches the function that can send two kinds of different wave lengths; Only many increases optical filter part and a synchronizable optical discriminator is needed at Bob end.The required device cost increased of system equipment is lower, and structurally can realize QKD equipment _ identical feature of L and QKD equipment _ R, reach any two QKD equipment and all can realize point to point connect and the function communicated, equipment operating is simple and convenient, is convenient to batch production;
2, the Bob end at duplexing QKD system two ends uses optical filter part and two kinds of discriminators, is convenient to differentiate link-quality, system debug and positioning problems.Such as, the Bob on Alice and the QKD_R on QKD_L establishes the link, and brings into operation, if find, on QKD_L, Bob holds the discriminator corresponding to the synchronizable optical wavelength that local terminal Alice sends to have output, then illustrate that optical fiber link exists synchronizable optical reflection.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the synchronous method in prior art.
Fig. 2 is unidirectional (one-way), duplexing QKD system schematic based on the existing method of synchronization.
Fig. 3 is synchronous method scene one schematic diagram of the synchronizer of a kind of quantum key distribution system of the utility model.
Fig. 4 is duplex system schematic diagram.
Fig. 5 is based on duplexing QKD system schematic of the present utility model.
Fig. 6 is the duplexing QKD system schematic that Alice uses the synchronizable optical laser of two different wave lengths.
Fig. 7 is the duplexing QKD system schematic that Alice uses the synchronizable optical laser of a variable wavelength.
Fig. 8 is the duplexing QKD system schematic that Alice and Bob uses the synchronizable optical laser of different wave length respectively.
Fig. 9 is synchronous method scene two schematic diagram of the synchronizer of a kind of quantum key distribution system of the utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in detail.
In duplex QKD system, the transmission of flashlight and synchronizable optical has two kinds of typical scenes.Scene one (Fig. 3) is that the Alice end signal light of system two ends QKD equipment and synchronizable optical can be coupling in same optical fiber and transmit, in this case, the Bob of system two ends QKD equipment needs two-stage optical filter part and two discriminators, flashlight is separated with synchronizable optical by first order optical filter part, and isolated synchronizable optical is sent among corresponding discriminator and screened by second level optical filter part.Scene two (Fig. 9) be system two ends QKD equipment Alice end flashlight and synchronizable optical transmit in two optical fiber respectively, in this case, the Bob of system two ends QKD equipment only needs one-level optical filter part and two discriminators, and isolated synchronizable optical is sent among corresponding discriminator and screened by optical filter part.
Following embodiment is all the introductions carried out for scene one.
Fig. 3 is a schematic diagram of the synchronous method scene one adopting the utility model structure, this system shown in figure is a typical case, and not exclusive situation, this schematic diagram is just in order to the Alice of detailed description duplex QKD system two ends QKD equipment sends wherein a kind of process of the different synchronizable optical of two kinds of wavelength respectively, and the Bob of two ends QKD equipment adopts optical filter part to be separated with synchronizable optical by flashlight, adopt the detailed process that corresponding discriminator is screened synchronizable optical again, be mainly used to optical filter part separation signal light and the process of synchronizable optical and the selection of optical filter part are described.
Eliminate the Bob end of QKD equipment _ L and the Alice end of QKD equipment _ R in Fig. 3, only embody the process of Alice end to unidirectional synchronizable optical of the Bob end transmission of QKD equipment _ R of QKD equipment _ L; The Alice of QKD equipment _ R is identical with it to the process of the Bob transmission synchronizable optical of QKD equipment _ L.
The Alice of QKD equipment _ L contains multiple flashlight laser and two synchronizable optical lasers, and synchronizable optical laser 1 can send the different synchronizable optical λ of two kinds of wavelength respectively with 2
1and λ
2.Alice choice for use wherein a kind of wavelength (λ of QKD equipment _ L
1or λ
2) synchronizable optical, such as select wavelength be λ
1synchronizable optical, i.e. the central wavelength lambda of synchronizable optical
sync=λ
1, be λ with N Lu Zhizheng wavelength
signalflashlight be coupling in the Bob sending to QKD equipment _ R in same optical fiber link.Correspondingly, Alice (not shown in Fig. 3) the choice for use wavelength of QKD equipment _ R is λ
2synchronizable optical.
The Bob of QKD equipment _ R uses first order optical filter part to isolate flashlight, re-uses second level optical filter part and isolates synchronizable optical.Preferably, first order optical filter part can select dense wavelength division multiplexing (Dense Wavelength Division Multiplexing, DWDM) device, and its centre wavelength is λ
signal.Flashlight and synchronizable optical, after DWDM device, isolate flashlight according to centre wavelength, carry out flashlight subsequent treatment; Synchronizable optical signal except flashlight is unified sends into second level optical filter part.Preferably, second level optical filter part can select DWDM device, and its centre wavelength is λ
1or λ
2, separable go out the different synchronizable optical of two kinds of wavelength, be λ by wavelength
1synchronizable optical send in discriminator 1, be λ by wavelength
2synchronizable optical send in discriminator 2, to screen synchronizable optical.Namely the signal screened out from discriminator 1 or discriminator 2 as synchronizing signal (in this example is and λ
1corresponding synchronizing signal), for flashlight subsequent processes.
Based in the duplexing QKD system configuration of synchronous method described in Fig. 3, every platform QKD equipment all comprises transmitting terminal Alice and receiving terminal Bob, can carry out full duplex work, can transmitting two paths synchronizable optical in optical fiber link, as shown in Figure 4.The Alice of duplex system two ends QKD equipment is all containing the laser that can send two kinds of different wave length synchronizable optical, the Bob of two ends QKD equipment is all containing two-stage optical filter part, first order optical filter part separable go out flashlight and synchronizable optical, isolated synchronizable optical is sent among corresponding discriminator and is screened by second level optical filter part.
The described duplexing QKD system based on this method of synchronization, can also comprise a top level control module, and as shown in Figure 5, the major function of this control module is synchronizable optical control QKD link using which wavelength.When a link selection wavelength is λ
1synchronizable optical sync1 time, an other link then uses wavelength for λ
2synchronizable optical sync2.Control module can pass through the hardware implementing such as single-chip microcomputer, FPGA, DSP.
Duplexing QKD system described in the utility model, its structure as shown in Figure 5, QKD equipment _ L and QKD equipment _ R all comprises Alice and Bob, two QKD links can be set up between two equipment simultaneously, link between the Bob of i.e. Alice and the QKD equipment _ R of QKD equipment _ L, and the link between the Bob of Alice and the QKD equipment _ L of QKD equipment _ R.Whole duplexing QKD system uses full-duplex mode work.The feature of duplex QKD system is, article two, QKD link uses the synchronizable optical of different wave length, avoid when the wavelength of the synchronizable optical that two links use is identical, article one, the reverberation of link synchronization light can disturb the problem of the normal examination of another link synchronization light, solve the problem that two QKD links can not run simultaneously, achieve the full duplex function of QKD system.
The Alice of QKD equipment _ L and QKD equipment _ R can be the synchronizable optical laser containing sending two kinds of different wave lengths, also can be that the Alice of QKD equipment _ L and QKD equipment _ R uses the synchronizable optical laser of different wave length respectively.If the Alice of QKD equipment _ L and QKD equipment _ R is the first situation, then the Bob of QKD equipment _ L and QKD equipment _ R all containing two-stage optical filter part, the synchronizable optical of separable flashlight and two kinds of different wave lengths; If the Alice of QKD equipment _ L and QKD equipment _ R is the second situation, then the Bob of QKD equipment _ L and QKD equipment _ R only contains one-level optical filter part, separable flashlight and synchronizable optical.
In described duplexing QKD system, the synchronizable optical laser of the Alice of QKD equipment _ L and QKD equipment _ R can comprise but be not limited to following several form:
Embodiment one (using the synchronizable optical laser of two different wave lengths)
option1 (wavelength of the synchronizable optical that Alice sends is determined by control module):
As shown in Figure 6, the Alice of QKD equipment _ L and QKD equipment _ R is all configured with two synchronizable optical lasers---and synchronizable optical laser 1 and synchronizable optical laser 2, wherein synchronizable optical laser 1 sends synchronizable optical sync1 regularly, and wavelength is λ
1, synchronizable optical laser 2 sends synchronizable optical sync2 regularly, and wavelength is λ
2, and λ
1≠ λ
2.The Bob of QKD equipment _ L and QKD equipment _ R is all configured with two-stage optical filter part, first order optical filter part separable go out flashlight and synchronizable optical, second level optical filter part separable go out the different synchronizable optical of two-way wavelength, as shown in Figure 3.Isolated two-way synchronizable optical is sent among corresponding discriminator by second level optical filter part respectively, and discriminator 1 regularly screening center's wavelength is λ
1synchronizable optical sync1, discriminator 2 regularly screening center's wavelength is λ
2synchronizable optical sync2.
Be configured with control module in described duplexing QKD system, send wavelength different synchronizable optical sync1 and sync2 respectively in order to control QKD equipment _ L with QKD equipment _ R; Meanwhile, correspond to the synchronizable optical that Alice sends, the signal which kind of discriminator detects by Bob that control module also control QKD equipment _ L and QKD equipment _ R is respectively as synchronizing signal.
Specifically be implemented as follows: on the link between the Bob of Alice and the QKD equipment _ R of QKD equipment _ L, the Alice of control module scheduling QKD equipment _ L uses synchronizable optical laser 1, and transmission wavelength is λ
1synchronizable optical sync1; Then hold at the Bob of QKD equipment _ R, isolate flashlight by first order optical filter part, then isolate synchronizable optical sync1 by second level optical filter part.Through control module scheduling, the signal detected by discriminator 1 is as synchronizing signal.
Accordingly, on the link between the Bob of Alice and the QKD equipment _ L of QKD equipment _ R, the Alice of control module scheduling QKD equipment _ R uses synchronizable optical laser 2, and transmission wavelength is λ
2synchronizable optical sync2; Then hold at the Bob of QKD equipment _ L, isolate flashlight by first order optical filter part, then isolate synchronizable optical sync2 by second level optical filter part.Through control module scheduling, the signal detected by discriminator 2 is as synchronizing signal.
The benefit of use control module is, when synchronously the going wrong of a certain QKD link, such as synchronizable optical laser or the discriminator appearance exception of this QKD link, then can carry out scheduling to the synchronizable optical laser in the QKD equipment of two ends and discriminator easily by control module to switch, full duplex QKD system still can normally be worked.Such as, if synchronizable optical laser 1 operation irregularity that the Alice of QKD equipment _ L uses, then the Alice of control module scheduling QKD equipment _ L uses synchronizable optical laser 2, and the signal that discriminator 2 detects by the Bob dispatching QKD equipment _ R is as synchronizing signal; Meanwhile, the Alice of control module scheduling QKD equipment _ R uses synchronizable optical laser 1, and the signal that discriminator 1 detects by the Bob dispatching QKD equipment _ L is as synchronizing signal.
option2 (wavelength of the synchronizable optical that Alice sends is by initial configuration):
The Alice of QKD equipment _ L and QKD equipment _ R is all configured with two synchronizable optical lasers---synchronizable optical laser 1 and synchronizable optical laser 2.Synchronizable optical laser 1 sends synchronizable optical sync1 regularly, and wavelength is λ
1; Synchronizable optical laser 2 sends synchronizable optical sync2 regularly, and wavelength is λ
2, and λ
1≠ λ
2.
The Bob of QKD equipment _ L and QKD equipment _ R is all configured with two-stage optical filter part, first order optical filter part separable go out flashlight, second level optical filter part separable go out the different synchronizable optical of two kinds of wavelength, as shown in Figure 3.Isolated two-way synchronizable optical is sent among corresponding discriminator by second level optical filter part respectively, and discriminator 1 regularly screening center's wavelength is λ
1synchronizable optical sync1, discriminator 2 regularly screening center's wavelength is λ
2synchronizable optical sync2.
After system initial configuration, QKD equipment _ L adopts synchronizable optical laser 1 to send synchronizable optical sync1, and the signal detected by discriminator 2 is as synchronizing signal; QKD equipment _ R adopts synchronizable optical laser 2 to send synchronizable optical sync2, and the signal detected by discriminator 1 is as synchronizing signal.
When synchronously the going wrong of a certain QKD link, such as synchronizable optical laser or the discriminator appearance exception of this QKD link, then can by modes such as system re-initialization, carry out scheduling to the synchronizable optical laser in the QKD equipment of two ends and discriminator to switch, full duplex QKD system still can normally be worked.Such as, if synchronizable optical laser 1 operation irregularity that the Alice of QKD equipment _ L uses, then initialization is re-started to duplexing QKD system, when initial configuration, the Alice of configuration QKD equipment _ L uses synchronizable optical laser 2, and the signal that discriminator 2 detects by the Bob configuring QKD equipment _ R is as synchronizing signal; Meanwhile, the Alice of configuration QKD equipment _ R uses synchronizable optical laser 1, and the signal that discriminator 1 detects by the Bob configuring QKD equipment _ L is as synchronizing signal.
Embodiment two (using the synchronizable optical laser of a variable wavelength)
option1 (wavelength of the synchronizable optical that Alice sends is determined by control module):
As shown in Figure 7, the Alice of QKD equipment _ L and QKD equipment _ R all uses the synchronizable optical laser of a Wavelength tunable, and the synchronizable optical laser of this Wavelength tunable can send synchronizable optical sync1, and wavelength is λ
1, also can send synchronizable optical sync2, wavelength is λ
2, and λ
1≠ λ
2, its wavelength sending synchronizable optical is dispatched by control module.The Bob of QKD equipment _ L and QKD equipment _ R is all configured with two-stage optical filter part, first order optical filter part separable go out flashlight and synchronizable optical, second level optical filter part separable go out the synchronizable optical of different wave length, as shown in Figure 3.Isolated two-way synchronizable optical sent into respectively among corresponding discriminator, wavelength screened regularly by discriminator 1 is λ
1synchronizable optical sync1, wavelength screened regularly by discriminator 2 is λ
2synchronizable optical sync2.
Be configured with control module in described duplexing QKD system, the Alice in order to Alice with the QKD equipment _ R of control QKD equipment _ L sends wavelength different synchronizable optical sync1 and sync2 respectively.Meanwhile, correspond to the synchronizable optical that Alice sends, the signal which kind of discriminator detects by Bob that control module also control QKD equipment _ L and QKD equipment _ R is respectively as synchronizing signal.
Specifically be implemented as follows: on the link between the Bob of Alice and the QKD equipment _ R of QKD equipment _ L, the Alice of control module scheduling QKD equipment _ L uses the synchronizable optical laser of Wavelength tunable, and transmission wavelength is λ
1synchronizable optical sync1; Then hold at the Bob of QKD equipment _ R, isolate flashlight by first order optical filter part, then isolate synchronizable optical sync1 by second level optical filter part.Through control module scheduling, the signal detected by discriminator 1 is as synchronizing signal.
Accordingly, on the link between the Bob of Alice and the QKD equipment _ L of QKD equipment _ R, the Alice of control module scheduling QKD equipment _ R uses the synchronizable optical laser of Wavelength tunable, and transmission wavelength is λ
2synchronizable optical sync2; Then hold at the Bob of QKD equipment _ L, isolate flashlight by first order optical filter part, then isolate synchronizable optical sync2 by second level optical filter part.Through control module scheduling, the signal detected by discriminator 2 is as synchronizing signal.
option2 (wavelength of the synchronizable optical that Alice sends is by initial configuration):
The Alice of QKD equipment _ L and QKD equipment _ R all uses the synchronizable optical laser of a Wavelength tunable, and the synchronizable optical laser of this Wavelength tunable can send synchronizable optical sync1, and wavelength is λ
1, also can send synchronizable optical sync2, wavelength is λ
2, and λ
1≠ λ
2.
The Bob of QKD equipment _ L and QKD equipment _ R is all configured with two-stage optical filter part, first order optical filter part separable go out flashlight and synchronizable optical, second level optical filter part separable go out the synchronizable optical of two kinds of different wave lengths, as shown in Figure 3.Isolated two-way synchronizable optical sent into respectively among corresponding discriminator, discriminator 1 regularly screening center's wavelength is λ
1synchronizable optical sync1, discriminator 2 regularly screening center's wavelength is λ
2synchronizable optical sync2.
When system initial configuration, it is λ that configurable QKD equipment _ L sends wavelength
1synchronizable optical sync1, and the signal detected by discriminator 2 is as synchronizing signal; It is λ that configuration QKD equipment _ R sends wavelength
2synchronizable optical sync2, and the signal detected by discriminator 1 is as synchronizing signal.
Embodiment three (system two ends use the synchronizable optical laser of a different wave length respectively)
As shown in Figure 8, QKD equipment _ L and QKD equipment _ R uses the synchronizable optical laser of a different wave length respectively, and it is λ that synchronizable optical laser 1 sends wavelength regularly
1synchronizable optical sync1, it is λ that synchronizable optical laser 2 sends wavelength regularly
2synchronizable optical sync2, and λ
1≠ λ
2.The Bob of QKD equipment _ L and QKD equipment _ R all adopts one-level optical filter part, in order to isolate flashlight and synchronizable optical.Synchronizable optical after separation is sent in discriminator, and discriminator 1 regularly screening center's wavelength is λ
1synchronizable optical sync1, discriminator 2 regularly screening center's wavelength is λ
2synchronizable optical sync2.
Specifically be implemented as follows: on the link between the Bob of Alice and the QKD equipment _ R of QKD equipment _ L, the Alice of QKD equipment _ L uses synchronizable optical laser 1, and sending wavelength is regularly λ
1synchronizable optical sync1, then hold at the Bob of QKD equipment _ R, after one-level optical filter part isolates synchronizable optical, use discriminator 1 carry out screening center's wavelength for λ
1synchronizable optical sync1.Accordingly, on the link between the Bob of Alice and the QKD equipment _ L of QKD equipment _ R, the Alice of QKD equipment _ R uses synchronizable optical laser 2, and sending wavelength is regularly λ
2synchronizable optical sync2, then hold at the Bob of QKD equipment _ L, after one-level optical filter part isolates synchronizable optical, use discriminator 2 carry out screening center's wavelength for λ
2synchronizable optical sync2.
Fig. 9 is a schematic diagram of the synchronous method Scene two adopting the utility model structure.This system shown in Fig. 9 is a typical case, and not exclusive situation.Eliminate the Bob end of QKD equipment _ L and the Alice end of QKD equipment _ R in Fig. 9, only embody the process of Alice end to unidirectional synchronizable optical of the Bob end transmission of QKD equipment _ R of QKD equipment _ L; The Alice of QKD equipment _ R is identical with it to the process of the Bob transmission synchronizable optical of QKD equipment _ L.
Flashlight shown in scene two and synchronizable optical use two optical fiber links to transmit respectively, are equally applicable to several situations described in embodiment one, two, three in the utility model.
The foregoing is only the preferred embodiment that the utility model is created; do not create in order to limit the utility model; the any amendment done within all spirit of creating at the utility model and principle, equivalent to replace and improvement etc., all should be included within protection range that the utility model creates.
Claims (6)
1. the synchronizer of a quantum key distribution system, this quantum key distribution system is duplexing QKD system, it is characterized in that: the synchronizable optical laser that can send the synchronizable optical of two kinds of different wave lengths respectively comprising the system transmit leg of the QKD equipment being configured in QKD system two ends respectively, the system acceptance Fang Jun of the QKD equipment at QKD system two ends is configured with discriminator, adopts corresponding discriminator to screen synchronizable optical.
2. the synchronizer of quantum key distribution system as claimed in claim 1, it is characterized in that: the system transmit leg of the QKD equipment at QKD system two ends all has two synchronizable optical lasers that can send different wavelength, and the system acceptance Fang Jun of the QKD equipment at QKD system two ends is configured with the discriminator that optical filter part and two kinds can screen two kinds of different wave lengths that synchronizable optical laser sends respectively, isolated synchronizable optical is sent among corresponding discriminator and is screened by optical filter part.
3. the synchronizer of quantum key distribution system as claimed in claim 2, it is characterized in that: in described duplexing QKD system, go back configuration control module, the synchronizable optical laser of the QKD equipment at control module control QKD system two ends sends the synchronizable optical of any wavelength respectively, and the signal which kind of discriminator detects by system acceptance side that control module also control the QKD equipment at two ends is respectively as synchronizing signal.
4. the synchronizer of quantum key distribution system as claimed in claim 1, it is characterized in that: the system transmit leg of the QKD equipment at QKD system two ends is all furnished with the synchronizable optical laser of a Wavelength tunable, and the system acceptance Fang Jun of the QKD equipment at QKD system two ends is configured with the discriminator that optical filter part and two kinds can screen two kinds of different wave lengths that synchronizable optical laser sends respectively, isolated synchronizable optical is sent among corresponding discriminator and is screened by optical filter part.
5. the synchronizer of quantum key distribution system as claimed in claim 4, it is characterized in that: in described duplexing QKD system, go back configuration control module, the synchronizable optical that the synchronizable optical laser of the Wavelength tunable of the system transmit leg of the QKD equipment at two ends sends any wavelength is respectively dispatched by control module, and the signal which kind of discriminator detects by system acceptance side that control module also control the QKD equipment at two ends is respectively as synchronizing signal.
6. the synchronizer of quantum key distribution system as claimed in claim 1, it is characterized in that: the synchronizable optical laser that the system transmit leg of the QKD equipment at described QKD system two ends is furnished with is the synchronizable optical laser of a fixed wave length, the system acceptance Fang Jun of the QKD equipment at QKD system two ends is configured with the discriminator can fixed and screen the wavelength received.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104202157A (en) * | 2014-09-16 | 2014-12-10 | 安徽量子通信技术有限公司 | Quantum key distribution (QKD) system synchronization method and device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104202157A (en) * | 2014-09-16 | 2014-12-10 | 安徽量子通信技术有限公司 | Quantum key distribution (QKD) system synchronization method and device |
| CN104202157B (en) * | 2014-09-16 | 2018-01-02 | 科大国盾量子技术股份有限公司 | The synchronous method and device of a kind of quantum key distribution system |
| CN107947926A (en) * | 2014-09-16 | 2018-04-20 | 科大国盾量子技术股份有限公司 | The synchronous method and device of a kind of quantum key distribution system |
| CN107947926B (en) * | 2014-09-16 | 2021-07-30 | 科大国盾量子技术股份有限公司 | Synchronization method and device of quantum key distribution system |
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Address after: 230001, D3 building, Hefei Innovation Industrial Park, 800 Wangjiang West Road, Hefei hi tech Zone, Anhui Patentee after: QUANTUM COMMUNICATION TECHNOLOGY CO., LTD. Address before: 230001, D3 building, Hefei Innovation Industrial Park, 800 Wangjiang West Road, Hefei hi tech Zone, Anhui Patentee before: Anhui Liangzi Communication Technology Co., Ltd. |