CN204761454U - Multi -user quantum key distribution network system based on sagnac ring - Google Patents
Multi -user quantum key distribution network system based on sagnac ring Download PDFInfo
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Abstract
The utility model discloses a multi -user quantum key distribution network system based on sagnac ring, including the cyclic annular pulse transmission link of alice control end, multi -user bob customer end and sagnac, multi -user bob customer end includes that multi -wavelength pulsed laser produces device, photon interference signal probe end, multiuser multiplexing module and coupler, the cyclic annular pulse transmission link of sagnac includes clockwise's CW link and anticlockwise's CCW link, the multi -wavelength pulse is through the coupler with 50: 50 the proportion enters into all follow at last behind CW link and the CCW link the coupler merges output, and the information loading is carried out through the user of difference through wavelength devision multiplex demultiplexer respectively with the mode of wave length addressing to the light pulse of different wavelength, transmits to from the coupler at last the photon interference signal probe end survey. The utility model has the advantages that the whole structure is simple list, convenient to use, its photon utilization ratio and one -tenth code check are high, the good multi -user's transmission that just can realize a pair of N of transmission stability.
Description
Technical field
The utility model relates to quantum information and technical field of optical fiber communication, specifically based on the multi-user quantum key distribution network system of Sagnac ring.
Background technology
Quantum cryptology is the emerging cross discipline that information science, quantum mechanics and a cryptography combine, quantum mechanics and the application of information science in cryptography, relate generally to the multiple subjects such as quantum physics, information science and computer science, there is potential using value and great scientific meaning.Quantum communications refer to a kind of novel communication mode utilizing quantum effect to carry out information transmission, quantum uncertainty principle and cloning theorem etc. can not ensure that the absolute safety of quantum cryptography from principle.
In Technique on Quantum Communication, point-to-point two side's quantum key distribution technology have been tending towards ripe, but its photon utilance and transmission stability also need to strengthen further, simultaneously, along with the development of world information, increasing complicated fiber optic network is established and puts into operation.Important practical problem needs to develop into a pair N based on man-to-man communication mode in QKD future face one, N is to one, even N is to the quantum key distribution network of N, the fusion of quantum network and classical communication network can be carried out simultaneously, avoid quantum communication must set up the great input of dedicated network with this, meet multi-user communication efficiently.
Quantum key distribution constructing network topology mainly contains two kinds of modes: the trunking plan based on trusted node and the transparent optical link scheme based on optical switch.The former can the distance of arbitrary extension key distribution, but must ensure the physical security of all nodes; The latter in believable network, can need not realize the quantum key distribution between multi-user.Adopt the network of optical nodes, the core devices of QKD encoding and decoding has phase-modulator, polarizer, single-photon detector etc., and the optical nodes of QKD optical-fiber network has beam splitter, light opens the light, fiber grating, Wavelength division multiplexer/demultiplexer etc.Adopt the network of optical switch to have to be easy to the advantage realized, but also Shortcomings.Multiple communication members can link together by this network, but in fact remains point-to-point communication.Early stage employing luminous-power distributor carries out multi-user quantum key distribution, the average key of N number of user produces speed when being unique user secret-key rate 1 N.Along with the increase of number of users, the code check of each user can decline, so efficiency can reduce, is unfavorable for that adding users quantity carries out extension of network.In the quantum key distribution network of the employing wavelength-division multiplex technique developed subsequently, user carries out QKD by wave length addressing.This scheme synchronization can only produce a kind of light pulse of wavelength, in fact still man-to-man scheme.
Two schemes described above limits user all to a great extent to be increased, and user's expansion causes producing the problems such as secret generating rate reduction.The scheme proposed successively afterwards, although add number of users, create such as crosstalk between user, increase the problems such as the error rate, its feasibility also needs actual experiment to verify.This group proposes the scheme utilizing Wavelength division multiplexer/demultiplexer and faraday mirror to carry out multi-user quantum key distribution, utilizes the phase drift of the reflection compensation circuit of faraday mirror, solves the multi-user such as plug and play, M-Z type QKD network insertion problem.
This programme is based on Sagnac effect principle, and the Sagnac ring interferometer of employing is characterized in that the two-beam sent by same light source is divided into two bundles, makes it in interferometer, transmit junction bundle after a week in opposite directions and produces interference.Therefore there is zero optical path difference, automatically eliminate the noise of interfering two-arm not etc. to cause, and require lower to coherent source, wideband light source can be used, be also suitable for Disturbance Detection.After Sagnac effect is suggested, current people mainly make use of its interference structure on its basis and have made optical fiber Sagnac ring, and are used in sensory field of optic fibre, are used for carrying out the sensing of temperature, strain, angular speed etc.Make optic fiber gyroscope, optical fiber Sagnac ring wave filter, fibre optic hydrophone etc.
This programme, based on the QKD scheme of Sagnac ring, utilizes it can the feature such as compensated birefringence and phase drift.This programme solves Sagnac ring-type QKD network insertion by Wavelength division multiplexer/demultiplexer, proposes the classical coalescing network system of multi-user quantum based on Sagnac ring and quantum cryptography key distribution method, realizes multi-user quantum key distribution.The utility model system configuration is reasonable, and easy and simple to handle, cost is low, adopts the structure of Sagnac ring, phase fluctuation and polarization variations are compensated automatically, and can compensated birefringence, and then improves photon utilance and become code check.Utilize wavelength programme and the pulse delay technology accurately of secondary equal difference frequency interval simultaneously, eliminate the crosstalk between different user.By wavelength division multiplexing demodulation multiplexer quantum signal is multiplexed in classical channel, cost-saving further.For the practicality improving China quantum secret communication, the integrated fail safe with information of Strengthens network scale, has important scientific meaning and using value.
Based on the state of development of above-mentioned prior art, existingly urgently develop that a kind of structure is simple, easy to use, photon utilance with become that code check is high, transmission is stable and the multi-user quantum key distribution network system of a pair N can be realized.
Utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art, provide that a kind of structure is simple, easy to use, photon utilance with become that code check is high, transmission is stable and the multi-user quantum key distribution network system based on Sagnac ring of a pair N can be realized.
The technical solution of the utility model is achieved in that the multi-user quantum key distribution network system based on Sagnac ring, comprises Alice control end, multi-user Bob client, Sagnac annular pulse transmission link, wherein:
Described multi-user Bob client comprises multi-Wavelength Pulses laser generator, coupler, interference of photons signal detecting device and multiuser multiplexing module;
Described Sagnac annular pulse transmission link comprises clockwise CW link and anticlockwise CCW link, and the optical pulse propagation route of described CW link is that the light pulse exported from coupler finally gets back to described coupler through Polarization Controller, multiuser multiplexing module, the first common fiber, Alice control end, the second common fiber successively; The optical pulse propagation route of described CCW link is that the light pulse exported from coupler finally gets back to described coupler through the second common fiber, Alice control end, the first common fiber, multiuser multiplexing module, Polarization Controller successively;
Described multi-Wavelength Pulses generation device produces multi-Wavelength Pulses and after described coupler, is divided into two-beam pulse and merges from described coupler after entering into the CW link of described Sagnac annular pulse transmission link and CCW link with 50:50 ratio again and export, and the light pulse merging output from described coupler is transported to again described interference of photons signal detecting device and detects.
Further, described multiuser multiplexing module comprises multiple Bob user, first Wavelength division multiplexer/demultiplexer and the second Wavelength division multiplexer/demultiplexer, multiple Bob user is connected between described first Wavelength division multiplexer/demultiplexer and the second Wavelength division multiplexer/demultiplexer side by side.
Particularly, the number of described Bob user is 4.
Particularly, described Bob user comprises the delay line, Bob end Polarization Controller and the Bob that are linked in sequence and holds phase-modulator, described delay line is connected with described first Wavelength division multiplexer/demultiplexer, and described Bob holds phase-modulator to be connected with described second Wavelength division multiplexer/demultiplexer.
Further, described first Wavelength division multiplexer/demultiplexer is connected with described Alice control end by the first common fiber, and described second Wavelength division multiplexer/demultiplexer is connected with described coupler by Polarization Controller.
Further, described Alice control end comprises Alice end variable optical attenuator, Alice holds Polarization Controller and Alice end phase-modulator; Light pulse holds phase modulator modulation additional generation phase through CW link from described Alice
a, then hold Polarization Controller through Alice, then hold variable optical attenuator to be attenuated to every pulsed light subnumber through described Alice and be μ=0.1, eventually pass common fiber and turn back in described coupler; Light pulse holds phase modulator modulation additional generation phase through CCW link from described Bob
b, and then turn back in described coupler.
Particularly, be linked in sequence between described Alice control end and described coupler the 3rd Wavelength division multiplexer/demultiplexer and the 4th Wavelength division multiplexer/demultiplexer, merges channel connect between described 3rd Wavelength division multiplexer/demultiplexer and the 4th Wavelength division multiplexer/demultiplexer by quantum classics.
Particularly, described multi-Wavelength Pulses laser generator comprises multiple-wavelength laser, wavelength selector and circulator, and the light pulse that described multiple-wavelength laser produces enters into described coupler successively after described wavelength selector and circulator.
Further, described interference of photons signal detecting device comprises the first multi-wavelength single-photon detector and the second multi-wavelength single-photon detector, described first multi-wavelength single-photon detector is connected with described coupler by circulator, and described second multi-wavelength single-photon detector is directly connected with described coupler.
Compared with prior art, the beneficial effects of the utility model have:
1), share a multiple-wavelength laser and wavelength selector, save cost; 2), adopt Sagnac ring principle to carry out quantum key distribution, phase fluctuation and polarization variations are compensated automatically, and can self-alignment compensated birefringence; Adopt Polarization Controller control Alice control end, Bob user side and coupler respectively, accurately control polarization variations; 3), for eliminating frequency secondary equal difference interval wavelength management that pulse crosstalk between user adopts and utilizing delay line, the crosstalk of different wave length signal can be reduced, reduce error rate of system; 4), there is good network extension function: be that a pair N quantum key distribution provides possibility, and the key rate of each user can not increase along with user and reduce; User organize use wavelength division multiplexing demodulation multiplexer, provide conveniently for adding and deleting user; 5), by time management mode, multiple user is same interference of photons signal detecting device altogether, simplifies device, cost-saving; 6), method that overall plan adopts be suitable for, required device is comparatively ripe, has higher exploitativeness.
Accompanying drawing explanation
Fig. 1 is the overall structure block diagram of the novel multi-user quantum key distribution network system based on Sagnac ring of this use.
Fig. 2 is that this use is novel based on Alice control end structural representation in the multi-user quantum key distribution network system of Sagnac ring.
Fig. 3 is the novel overall structure block diagram based on multiuser multiplexing module in the multi-user quantum key distribution network system of Sagnac ring of this use.
Fig. 4 is the concrete structure schematic diagram of the novel multi-user quantum key distribution network system based on Sagnac ring of this use.
Embodiment
Be described further this use is novel below in conjunction with accompanying drawing:
As Figure 1-Figure 4, based on the multi-user quantum key distribution network system of Sagnac ring, comprise Alice control end, multi-user Bob client, Sagnac annular pulse transmission link.Wherein:
Described multi-user Bob client comprises multi-Wavelength Pulses laser generator, coupler, interference of photons signal detecting device and multiuser multiplexing module;
Described Sagnac annular pulse transmission link comprises clockwise CW link and anticlockwise CCW link, and the transmission route of described CW link is that the light pulse exported from coupler finally gets back to described coupler through Polarization Controller, user's Multiplexing module, the first common fiber, Alice control end, the second common fiber successively; The transmission route of described CCW link is that the light pulse exported from coupler finally gets back to described coupler through the second common fiber, Alice control end, the first common fiber, multiuser multiplexing module, Polarization Controller successively, and the first common fiber mentioned here and the second common fiber refer to the optical fiber between described first Wavelength division multiplexer/demultiplexer and described Alice control end and between described Alice control end and described coupler respectively;
Described multi-Wavelength Pulses generation device produces multi-Wavelength Pulses and after described coupler, is divided into two light beams and merges from described coupler after entering into the CW link of described Sagnac annular pulse transmission link and CCW link with 50:50 ratio again and export, and the light pulse merging output from described coupler is transported to again described interference of photons signal detecting device and detects.
Described multiuser multiplexing module comprises multiple Bob user, first Wavelength division multiplexer/demultiplexer and the second Wavelength division multiplexer/demultiplexer, each Bob end carries out work according to wave length addressing, does not disturb mutually, particularly, the number of users of Bob described in the present embodiment is set to 4.Each Bob user is connected between described first Wavelength division multiplexer/demultiplexer and the second Wavelength division multiplexer/demultiplexer side by side by optical fiber.And described Bob user comprises the delay line, Bob end Polarization Controller and the Bob end phase-modulator that are linked in sequence, described delay line length ensure that coupler in CW link to be greater than in CCW link coupler to the length of described Alice control end link to the linkage length of Alice control end, thus make Alice control end can not have CW pulse and CCW pulse simultaneously, described delay line is connected with described first Wavelength division multiplexer/demultiplexer, and described Bob holds phase-modulator to be connected with described second Wavelength division multiplexer/demultiplexer.Described first Wavelength division multiplexer/demultiplexer is connected with described Alice control end by the first common fiber, and described second Wavelength division multiplexer/demultiplexer is connected with described coupler by Polarization Controller.
Described Alice control end comprises Alice and holds variable optical attenuator, Alice to hold Polarization Controller and Alice to hold phase-modulator, described Alice holds phase-modulator simultaneously for all users in network load phase information, while ensure that phase-modulation consistency and stability, also reduce cost.Light pulse holds phase modulator modulation additional generation phase through CW link from described Alice
a, and then hold Polarization Controller through Alice, then hold variable optical attenuator to be attenuated to every pulsed light subnumber through described Alice to be μ=0.1, to eventually pass common fiber and turn back in described coupler.And be linked in sequence between described Alice control end and described coupler the 3rd Wavelength division multiplexer/demultiplexer and the 4th Wavelength division multiplexer/demultiplexer, merge channel by quantum classics between described 3rd Wavelength division multiplexer/demultiplexer and the 4th Wavelength division multiplexer/demultiplexer and connect.
Described multi-Wavelength Pulses laser generator comprises multiple-wavelength laser, wavelength selector and circulator, and described multiple-wavelength laser is for generation of the multiwavelength laser pulse that can meet multiple user and communicate required simultaneously.The wavelength pulse being suitable for each Bob user and using selected by described wavelength selector according to Wavelength Assignment planning, and user's wavelength that the flexibility of its wavelength chooses is multiple-user network changes and user's increase and decrease provides possibility, add the expansibility of network, described wavelength selector is selected to select required multi-wavelength according to the method for secondary equal difference frequency interval during wavelength.The light pulse that described multiple-wavelength laser produces enters into described coupler successively after described wavelength selector and circulator.
Described interference of photons signal detecting device comprises the first multi-wavelength single-photon detector and the second multi-wavelength single-photon detector, described first multi-wavelength single-photon detector and the second multi-wavelength single-photon detector are respectively used to record result of interference, whether it responds, and is whether wavelength pulse corresponding with it there occurs constructive interference.Described first multi-wavelength single-photon detector and the second multi-wavelength single-photon detector can enter dormancy time after each detection event, namely eliminating by adding the dead time interference counting that afterpulse causes, reducing error rate of system.Described first multi-wavelength single-photon detector is connected with described coupler by circulator, and described second multi-wavelength single-photon detector is directly connected with described coupler.
Below in conjunction with accompanying drawing, specifying information transmittance process of the present utility model is described.
As shown in Figure 4, the parts that in figure, each label is corresponding are: 101-Alice holds phase-modulator, and 102-Alice holds Polarization Controller, and 103-Alice holds variable optical attenuator; 201-first Wavelength division multiplexer/demultiplexer, 202-second separates Wavelength division multiplexer/demultiplexer, 203-coupler, 213,223,233,243-Bob holds phase-modulator, 212,222,232,242-Bob holds Polarization Controller, 211,221,231,241-delay line; 301-multiple-wavelength laser, 302-wavelength selector, 303-circulator; 401-the 3rd multi-wavelength single-photon detector, 402-the 4th multi-wavelength single-photon detector; 501-Polarization Controller; 601-the 3rd Wavelength division multiplexer/demultiplexer, 602-the 4th separates Wavelength division multiplexer/demultiplexer; 701-first common fiber, 702-second common fiber; 801-quantum classics merge channel.
First stage: described multiple-wavelength laser 301 produces required multiwavelength laser pulse, described laser pulse through Optical Fiber Transmission to described wavelength selector 302, described wavelength selector 302 carries out wavelength chooses according to wavelength planning and period planning, and the laser pulse after selection enters into described coupler 203 through described circulator 303.The effect of described circulator 303 ensures that multi-wavelength light pulse single direction flows to coupler 203, and can not flow to described first multi-wavelength single-photon detector 401.
Second stage: after light pulse enters described coupler 203, is divided into two-beam line and enters respectively in the CW link of described Sagnac annular fiber transmission link and the CCW link of counterclockwise broadcasting with the ratio of 50:50.Light pulse in light pulse in CW link and CCW link is propagated in opposite direction, behind identical path, merges interfere at described coupler 203 place.
CW link: the light pulse in described CW link enters Second Wave successively and divides multiplexing demultiplexing device 202 after described Polarization Controller 501, be multiplexed in the special optic fibre of each Bob user in described second Wavelength division multiplexer/demultiplexer 202 place's wave length addressing mode, then be transferred to described first Wavelength division multiplexer/demultiplexer 201 and carry out demultiplexing, then enter into the first common fiber 701 and hold phase-modulator 101 by the Alice of described Alice control end successively again, Alice holds Polarization Controller 102, Alice holds variable optical attenuator 103, wherein hold modulated generation phase after phase-modulator 301 through described Alice
aunder the effect of described variable attenuator 103, decaying to every pulsed light subnumber through the light pulse of phase modulation is μ=0.1, and then by the second common fiber 703 enter into the 3rd Wavelength division multiplexer/demultiplexer, quantum classics merge channel 801 the 4th separate Wavelength division multiplexer/demultiplexer 602 carry out multiplexing, finally enter into and get back to described coupler.
CCW link: light pulse separates Wavelength division multiplexer/demultiplexer 602 by the second common fiber 702 the 4th, quantum classics merge channel 801 and the 3rd Wavelength division multiplexer/demultiplexer 601 place is multiplexed in the second common fiber 702 according to wave length addressing mode, then light pulse holds variable optical attenuator 103 place to decay at described Alice, when described Alice holds Polarization Controller 302 and Alice end phase-modulator 301, the information that do not occur loads, then described first Wavelength division multiplexer/demultiplexer 201 is entered into by the first common fiber 701, wave length addressing is passed through at described first Wavelength division multiplexer/demultiplexer 201, enter into the special optic fibre of each Bob user respectively, then successively through the delay line 211 of each Bob user, 221, 231, 241, Bob holds Polarization Controller 212, 222, 232, 242 and Bob hold phase-modulator 213, 223, 233, entering into described second Wavelength division multiplexer/demultiplexer 202 after 243 carries out multiplexing, enter into described coupler finally by described Polarization Controller 501 and produce to go out to produce at described coupler 203 with the light pulse that described CW link exports and interfere.Wherein, light pulse modulated generation phase when through each Bob end phase-modulator 213,223,233,243 in CCW link
b.
The described Alice that it may be noted that holds Polarization Controller 102, Bob to hold the effect of Polarization Controller 212,222,232,242 and Polarization Controller 501 to be that respective independent tuning pulse adapts to described Alice end phase-modulator 101 respectively, Bob holds phase-modulator 213,223,233,243 and coupler 203.
Described first multi-wavelength single-photon detector 401 and the second multi-wavelength single-photon detector 402 are for recording photon detection events.According to the difference of the information that Alice control end and each Bob user load, there will be different interference events.Make Δ φ=φ
a-φ
b, when two-beam pulse has π phase difference and Δ φ=π, described first multi-wavelength single-photon detector 401 can respond, and records photon detection events; When two-beam phase difference is zero, described second multi-wavelength single-photon detector 402 produces response, and records photon detection events.
The delay line 211,221,231,241 of each Bob user is used for control respectively to be made to be present in Alice control end when light pulse is different with light pulse in CCW link in CW link.The Sagnac circulus that the utility model adopts, can compensation of phase fluctuation and polarization variations automatically, and can self-alignment compensated birefringence.Structure is simple, and it is convenient to realize, and by the fusion of the classical channel of quantum, can save cost, avoid the waste of quantum channel special optic fibre.
Because quantum signal is in single photon level, pickup electrode is weak.Quantum communication network not only will meet ITU-T standard of wavelength, also must consider the impact of four-wave mixing effect on Signal transmissions.For this problem, adopt the method reply of wavelength planning, planned by wavelength, allow the new frequency light produced away from signal wavelength.The utility model adopts wavelength planning and uses the less optical fiber two kinds of methods of nonlinear effect to suppress four-wave mixing effect.Wavelength selector adopts the way selection wavelength of secondary equal difference frequency interval, and the new frequency light allowing four wave mixing produce is as far as possible away from the wavelength of these four pulse signals; The wavelength channel planning and designing of this suitable unequal-interval, the new frequencies of light major part of generation can be made away from other signal wavelengths, and the efficiency of four wave mixing strengthen along with wavelength interval and reduce, and reduces further systematic influence.For several wavelength below, fk, fk+1, fk+2, fk+3 ... side frequency is spaced apart Δ f, and fk+n-fk+n-1=Δ f, Δ f meet ITU-T frequency interval standard.The new frequencies of light that fk and fk+1, fk+3 and fk+6 produce is fk+2, fk+6, fk+12, the new frequencies of light that fk+1 and fk+3 and fk+6 produces is respectively fk+5 and fk+11, the new frequencies of light that fk+3 and fk+6 produces is fk+9, because the interval of fk and fk+3 is larger, the new frequency light fk+6 produced is relatively weak, therefore the utility model adopts the physical support of light pulse as information transmission of fk, fk+1, fk+3, fk+6, fk+10 etc.
The utility model has the advantages that: 1), share a multiple-wavelength laser and wavelength selector, saved cost; 2), utilize Sagnac ring principle to carry out quantum key distribution, phase fluctuation and polarization variations are compensated automatically, and can self-alignment compensated birefringence; Adopt Polarization Controller control Alice control end, Bob user side and coupler respectively, accurately control polarization variations; 3), for eliminating frequency secondary equal difference interval wavelength management that pulse crosstalk between user adopts and utilizing delay line, the crosstalk of different wave length signal can be reduced, reduce error rate of system; 4), there is good network extension function: be that a pair N quantum key distribution provides possibility, and the key rate of each user can not increase along with user and reduce; User organize use wavelength division multiplexing demodulation multiplexer, provide conveniently for adding and deleting user; 5), by time management mode, multiple user is same interference of photons signal detecting device altogether, simplifies device, cost-saving; 6), method that overall plan adopts be suitable for, required device is comparatively ripe, has higher exploitativeness.
The announcement of book and instruction according to the above description, the utility model those skilled in the art can also change above-mentioned execution mode and revise.Therefore, the utility model is not limited to embodiment disclosed and described above, also should fall in the protection range of claim of the present utility model modifications and changes more of the present utility model.In addition, although employ some specific terms in this specification, these terms just for convenience of description, do not form any restriction to the utility model.
Claims (9)
1. based on the multi-user quantum key distribution network system of Sagnac ring, it is characterized in that, comprise Alice control end, multi-user Bob client, Sagnac annular pulse transmission link, wherein:
Described multi-user Bob client comprises multi-Wavelength Pulses laser generator, coupler, Polarization Controller, multiuser multiplexing module and interference of photons signal detecting device;
Described Sagnac annular pulse transmission link comprises clockwise CW link and anticlockwise CCW link, and the optical pulse propagation route in described CW link finally gets back to described coupler through described Polarization Controller, multiuser multiplexing module, the first common fiber, Alice control end, the second common fiber successively after exporting from coupler; Optical pulse propagation route in described CCW link is that the light pulse exported from coupler finally gets back to described coupler through the second common fiber, Alice control end, the first common fiber, multiuser multiplexing module, Polarization Controller successively;
Described multi-Wavelength Pulses generation device produces multi-Wavelength Pulses, described multi-Wavelength Pulses is divided into two-beam through described coupler with the ratio of 50:50, all merge from described coupler after entering into the CW link of described Sagnac ring-type transmission link and CCW link respectively and export, the light pulse of output is transferred to again described interference of photons signal detecting device and detects.
2. as claimed in claim 1 based on the multi-user quantum key distribution network system of Sagnac ring, it is characterized in that, described multiuser multiplexing module also comprises multiple Bob user, the first Wavelength division multiplexer/demultiplexer, the second Wavelength division multiplexer/demultiplexer, and multiple Bob user is connected between described first Wavelength division multiplexer/demultiplexer and the second Wavelength division multiplexer/demultiplexer side by side.
3., as claimed in claim 1 based on the multi-user quantum key distribution network system of Sagnac ring, it is characterized in that, the number of described Bob user is 4.
4. as claimed in claim 2 based on the multi-user quantum key distribution network system of Sagnac ring, it is characterized in that, described Bob user comprises the delay line, Bob end Polarization Controller and the Bob that connect successively and holds phase-modulator, described delay line is connected with described first Wavelength division multiplexer/demultiplexer, and described Bob holds phase-modulator to be connected with described second Wavelength division multiplexer/demultiplexer.
5. as claimed in claim 2 based on the multi-user quantum key distribution network system of Sagnac ring, it is characterized in that, described first Wavelength division multiplexer/demultiplexer is connected with described Alice control end by the first common fiber, and described second Wavelength division multiplexer/demultiplexer is connected with described coupler by Polarization Controller successively.
6. as claimed in claim 1 based on the multi-user quantum key distribution network system of Sagnac ring, it is characterized in that, described Alice control end comprises Alice and holds variable optical attenuator, Alice to hold Polarization Controller and Alice to hold phase-modulator; Light pulse holds phase modulator modulation additional generation phase through CW link from described Alice
a, and then hold Polarization Controller through Alice, then hold variable optical attenuator to be attenuated to every pulsed light subnumber through described Alice to be μ=0.1, to eventually pass common fiber and turn back in described coupler; Light pulse holds phase modulator modulation additional generation phase through CCW link from described Bob
b, and then turn back in described coupler.
7. as claimed in claim 6 based on the multi-user quantum key distribution network system of Sagnac ring, it is characterized in that, be linked in sequence between described Alice control end and described coupler the 3rd Wavelength division multiplexer/demultiplexer and the 4th Wavelength division multiplexer/demultiplexer, merges channel connect between the 3rd Wavelength division multiplexer/demultiplexer and the 4th Wavelength division multiplexer/demultiplexer by quantum classics.
8. as claimed in claim 1 based on the multi-user quantum key distribution network system of Sagnac ring, it is characterized in that, described multi-Wavelength Pulses laser generator comprises multiple-wavelength laser, wavelength selector and circulator, and the light pulse that described multiple-wavelength laser produces enters into described coupler successively after described wavelength selector and circulator.
9. as claimed in claim 8 based on the multi-user quantum key distribution network system of Sagnac ring, it is characterized in that, described interference of photons signal detecting device comprises the first multi-wavelength single-photon detector and the second multi-wavelength single-photon detector, described first multi-wavelength single-photon detector is connected with described coupler by circulator, and described second multi-wavelength single-photon detector is directly connected with described coupler.
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| CN106161010A (en) * | 2016-08-19 | 2016-11-23 | 浙江神州量子网络科技有限公司 | The high one-tenth point-to-point QKD system of code check and transmitting terminal, receiving terminal and QKD method |
| CN106161010B (en) * | 2016-08-19 | 2023-06-20 | 浙江神州量子网络科技有限公司 | High-bit-rate point-to-point QKD system, transmitting end, receiving end and QKD method |
| CN114342313A (en) * | 2019-06-28 | 2022-04-12 | 康宁股份有限公司 | Quantum communication system comprising a multi-channel quantum repeater |
| CN111510290A (en) * | 2020-04-15 | 2020-08-07 | 中国人民解放军国防科技大学 | Phase fluctuation testing method in quantum key distribution system based on phase coding |
| CN111510290B (en) * | 2020-04-15 | 2022-04-22 | 中国人民解放军国防科技大学 | Phase fluctuation testing method in quantum key distribution system based on phase coding |
| CN112804056A (en) * | 2021-02-02 | 2021-05-14 | 上海循态信息科技有限公司 | Device and method for realizing independent quantum key distribution of continuous variable measurement equipment |
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