CN206042013U - Quantum key distribution system and coding device and decoding device based on time phase coding - Google Patents
Quantum key distribution system and coding device and decoding device based on time phase coding Download PDFInfo
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- CN206042013U CN206042013U CN201620925220.XU CN201620925220U CN206042013U CN 206042013 U CN206042013 U CN 206042013U CN 201620925220 U CN201620925220 U CN 201620925220U CN 206042013 U CN206042013 U CN 206042013U
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Abstract
The utility model discloses a based on the time phase coding's quantum key distribution system and corresponding coding device and decoding device, transmitting terminal and receiving terminal that the quantum key distribution system connects including mutual light, coding unit in the transmitting terminal include Z basic vector time coding module and phase coding module, the phase coding module is X basic vector phase coding module or Y basic vector phase coding module, decoding units in the receiving terminal includes Z basic vector time measured module and phase place measured module, and phase place measured module is X basic vector phase place measured module or Y basic vector phase place measured module, and with the phase coding module suits. The utility model discloses need not add phase modulator at the receiving terminal, can greatly reduced insertion loss, improve into the code check.
Description
Technical field
This utility model is related to quantum encryption communication technical field, it is more particularly to a kind of based on when m- phase code amount
Quantum key distribution system and corresponding encoding apparatus and decoding apparatus.
Background technology
As the development of society, information become more and more important, thing followed Communication Security Problem also becomes increasingly to dash forward
Go out, once sensational " prism door " event has caused compatriots with regard to the thinking of national information safety, and so far, classical is close
Code system is mainly by complexity of the calculation to guarantee the safety of information, but its from cardinal principle cannot guarantee information it is exhausted
To safety, and with the continuous lifting of computing power, the appearance of particularly following quantum computer so that classical secrecy system
System receives stern challenge, therefore finds new, and the secrecy technology with absolute safety becomes particularly important.Quantum is protected
The novel information area of security that close communication technology grows up as recent two decades, its based on quantum theory, theoretically
The method being perfectly safe is exchanged there is provided security information.2009, quantum E-gov Network, quantum communications net were built up in China in succession,
This causes to rest on rationale originally and the Quantum Secure Communication of laboratory stage starts in daily life
Occur.Quantum key distribution (QKD) as the research emphasis in quantum secret communication, while and wherein closest to practical
Field, has received more and more attention.
Since BB84 agreements are proposed, various forms of QKD agreements are emerged in large numbers one after another, and such as Ekert91 agreements, BBM92 are assisted
View, B92 agreements, six-state pr otocol etc., but compared with these agreements, BB84 schemes operate simpler practicality, and safety coefficient
Height, therefore BB84 schemes are still the QKD schemes being most widely used at present.The coded system of QKD be generally divided into polarization encoder and
Phase code, wherein, earliest phase code uses equiarm Mach-Zehnder interferometer schemes, and the program needs to use
Two fiber-optic transfer, the arm length difference change that path disturbance brings are very serious, therefore are not suitable for long range propagation.Later,
Bennett proposes double unequal arm MZI schemes (C.H.Bennett, " Quantum cryptography using any two
Nonorthogonal states ", Physical Review Letters, vol.68, no.21, pp.3121-3124,
1992.), transmitting terminal and receiving terminal have the equal interferometer of a pair of arm length differences, through transmitting terminal interferometer is long-armed, receiving terminal is interfered
The light pulse of instrument galianconism and interfere through the long-armed light pulse of transmitting terminal interferometer galianconism, receiving terminal interferometer, so as to reality
Existing encoding and decoding, but pass by galianconism-galianconism in the program and long-armed-long-armed light pulse is not interfered, so as to interfere effect
Rate (energy of the light for interfering and the ratio of gross energy) only 50%, in order to improve interference efficiency, Dixon et al. using inclined
Shake and select method (Dixon A, Yuan Z, Dynes J, et al. " the Continuous operation of high in path
bit rate quantum key distribution”,Applied Physics Letters,2010,96(16):
161102) so that only (or long through receiving terminal interferometer galianconism through the light pulse of transmitting terminal interferometer long-armed (or galianconism)
Arm) so that interference efficiency brings up to 100%.
The quantum key distribution system of existing phase code, as shown in figure 1, single including transmitting terminal, receiving terminal and control
First (not shown).During work, control unit control transmitting terminal coding module according to random number generation unit produce with
Machine number is encoded accordingly to flashlight, and the flashlight after being encoded sends receiving terminal to by quantum channel, is selected by receiving terminal
Select basic vector to be decoded accordingly, and measuring basic vector and measurement result are recorded.Optics in control unit with it is hard
Part data processing unit carries out process to the measurement result for obtaining and obtains after primary key information, by software processing elements to original
Key carries out Data Post work, successively including basic vector comparison, certification, error correction, errors validity, privacy amplification factor calculate and
Privacy is amplified, and final transmitting terminal and receiving terminal can obtain identical and safe final key.
Transmitting terminal includes light source module and coding module, and wherein light source module includes light-pulse generator 1, and coding unit includes
One 2, first guarantor's inclined phase-modulator 3 (i.e. X, Y basic vector phase code module) of polarization-maintaining beam splitter, first protect inclined delay line 4, first
Protect inclined polarization beam apparatus 5.
Receiving terminal includes decoding unit, and wherein decoding unit includes that as X the second guarantor of Y basic vector selecting modules wilfully shakes
Beam splitter 7, second is protected inclined phase-modulator 8, second and protects inclined delay line 9, the second polarization-maintaining beam splitter 10, the first single-photon detector
11st, the second single-photon detector 12, is quantum channel 6 between transmitting terminal and receiving terminal.
The light pulse of the light source module transmitting linear polarization of transmitting terminal enters coding module, and light pulse is divided by coding module
Beam, relative time delay simultaneously use X to one of them, and Y basic vector phase code module codings, output polarization state are orthogonal two
Light pulse inlet subchannel transmission is to receiving terminal.Detailed process：Light-pulse generator 1 launches the light pulse of linear polarization, light pulse
After reaching the A ports of the first polarization-maintaining beam splitter 2, two beam horizontal polarization light pulses are beamed into, a branch of light pulse protects inclined by first
The B ports output of beam splitter 2 reaches the first C-terminal mouth for protecting inclined polarization beam apparatus 5, now defines the B ends of the first polarization-maintaining beam splitter 2
Mouth is transmitting terminal galianconism to the first C-terminal mouth for protecting inclined polarization beam apparatus 5；C-terminal of another beam light pulse by the first polarization-maintaining beam splitter 2
Mouth output reaches first and protects inclined phase-modulator (X, Y basic vector phase code module), and first protects inclined phase-modulator 3 to light pulse
Four kinds of phase places 0 of random coded, pi/2, π, 3 pi/2s, the light pulse Jing first after coding are protected inclined delay line 4 and reach first and protect and wilfully shake
The B ports of inclined polarization beam apparatus 5 are protected for sending out to first in the B ports of beam splitter 5, the C-terminal mouth for now defining the first polarization-maintaining beam splitter 2
Sending end is long-armed, and two-way light pulse is protected inclined polarization beam apparatus 5 through first and transmits and be reflected into the orthogonal two light arteries and veins of polarization
Punching is simultaneously exported from the first A ports for protecting inclined polarization beam apparatus 5, reaches receiving terminal by quantum channel 6.
The light pulse for carrying coding information that receiving terminal decoding unit decoding transmitting terminal is transmitted, to two light arteries and veins
Beam splitting, relative time delay is rushed, and is exported according to coding information different choice detector.Detailed process：Two light of transmitting terminal output
Pulse Jing quantum channels reach the A ports that the second of receiving terminal protects inclined polarization beam apparatus 7, and horizontal polarization light pulse protects inclined by second
The B ports of polarization beam apparatus 7 are exported to the A ports of the second polarization-maintaining beam splitter 10, are now defined second and are protected inclined polarization beam apparatus 7
B ports to the second polarization-maintaining beam splitter 10 A ports be receiving terminal galianconism；Vertical polarization light pulse Jing second protects inclined polarization beam splitting
The reflection of device 7 is changed into horizontal polarization light pulse and exports phase-modulator 8 inclined to the second guarantor from C-terminal mouth, and second protects inclined phase-modulator 8
To light pulse random coded phase place 0, pi/2 selects X or Y measurement basic vectors, the light pulse Jing second after coding to protect inclined delay line 9 and reach
The C-terminal mouth of the second polarization-maintaining beam splitter 10, now defines second and protects the C-terminal mouth of inclined polarization beam apparatus 7 to the second polarization-maintaining beam splitter 10
C-terminal mouth be that receiving terminal is long-armed, according to the method that polarization selects path, the equivalent optical path that two-beam pulse is passed by, and polarization state
It is identical, therefore two-beam pulse is interfered in the second polarization-maintaining beam splitter 10, is arrived separately at according to interference information difference different single
Photon detector is exported.
Additionally, also a kind of mode is to realize phase using the unequal arm Michelson interferometers comprising faraday rotation mirror
Position coding, such as Publication No. CN 1651947A, patent name are " a kind of polarization controlling encoding method, encoder and quantum key
The Chinese invention patent of distribution system ", discloses a kind of a pair of unequal arm F-Ms of use based on four port beam splitters
(Faraday-Michelson) interferometer is realizing the QKD system of the phase code of Polarization Control, coherent detection, but its use
Common X-coupler so that the path random selection of single photon, reduces interference efficiency；Publication No. CN
101150371A, patent name are public for the Chinese invention patent of " a kind of quantum key dispatching system of phase code Polarization Detection "
A kind of a pair of unequal arm F-Ms (Faraday Michelson) interferometer of use based on four port polarization beam splitters has been driven come real
The phase code of existing Polarization Control, the QKD system of Polarization Detection, which equally selects the side in path with Dixon et al. using polarization
Improving interference efficiency, in such scheme, receiving terminal is required to add a phase-modulator to select X method, Y measurement basic vectors, no
But extra insertion loss can be brought, and so that system is affected into code check, and which makes phase-modulation not smart due to inherently problem
Really, cause finally to interfere contrast not high enough, so that it is low into code check, which greatly limits the development of QKD technologies.
In sum, there is following point in prior art：
1. existing phase code system needs to add phase-modulator to select X, Y measurement basic vectors, and phase place in receiving terminal
The rear end insertion loss of manipulator can reduce system into code check；
2. existing phase code system due to the phase-modulation precision of receiving terminal phase-modulator it is low, cause final dry
Relate to contrast not high enough, so that low into code check；
3. the existing coding system based on non-equilibrium basic vector scheme needs to produce random telecommunications at a high speed using signal generator
Number come the selection of the non-equilibrium basic vector of active control, program high cost, and device performance itself limit the accurate modulation of phase place,
So as to reduce into code check.
Utility model content
For the deficiencies in the prior art, this utility model provide it is a kind of based on when m- phase code quantum key point
Send out system and encoding apparatus and decoding apparatus, can effectively improve quantum key distribution system into code check.
It is a kind of based on when m- phase code quantum key distribution system, the transmitting terminal and reception including mutual light connects
End, transmitting terminal include the light source module for forming flashlight and for carrying out corresponding coding time phase to the flashlight
The coding unit of process, is correspondingly provided with receiving terminal for carrying out coded treatment time phase to the coding unit in transmitting terminal
Flashlight afterwards carries out the decoding unit of decoding process time phase, and described coding unit includes Z basic vector time encoding modules
With phase code module, the phase code module is X basic vector phase code modules or Y basic vector phase code modules；The solution
Code unit includes Z basic vector measure of time modules and phase measurement module, and phase measurement module is X basic vector phase measurement modules or Y
Basic vector phase measurement module, and be adapted with the phase code module.
During practical application, it is described based on when m- phase code quantum key distribution system also include sending out for control
Sending end and receiving terminal work make the control unit of the quantum key for forming therebetween share in different areas, the coding in the transmitting terminal
Unit is provided with phase code module and Z basic vector time encoding modules, and control unit makes one of them at random according to the first likelihood ratio
The random number loading for being encoded to produce random number generation unit in transmitting terminal to the flashlight that light source in transmitting terminal sends
To on the flashlight and being sent to receiving terminal；Decoding unit in the receiving terminal is provided with corresponding phase measurement module, Z bases
Arrow measure of time module and basic vector selecting module, the basic vector selecting module will be for will come from transmitting terminal according to the second likelihood ratio
Flashlight (flashlight after elapsed time phase code) be input in phase measurement module and Z basic vector measure of time modules
One measures to obtain carrying decoded result and measure the measurement result of basic vector information and feed back to control unit.
The random number that random number generation unit is produced is loaded onto on flashlight in this utility model real by the following method
It is existing：
Control unit forms corresponding control signal according to the random number that random number generation unit is produced and goes control time phase
Position coding unit carries out corresponding coding time phase to flashlight.
The first described likelihood ratio is the probability and selection phase for selecting Z basic vector time encoding modules to encode flashlight
The ratio of the probability encoded to flashlight by position coding module, the probability of selected phase coding module and selection in this utility model
The probability sum of Z basic vector time encoding modules is 1.
The second described probability is the probability and selected phase for selecting Z basic vector measure of time modules to decode flashlight
The ratio of the probability decoded to flashlight by measurement module, in this utility model select Z basic vector measure of time modules probability and
The probability sum of selected phase measurement module is 1.
Preferably, first likelihood ratio and the second likelihood ratio are not 0 and 1, and the two direct proportionality.
Encoded in this utility model (i.e. based on when m- phase place coding) when by control unit select it is general according to first
Rate is than selecting using Z basic vector time encoding modules or phase code module.
Receiving terminal is connected by quantum channel with transmitting terminal, described quantum channel can for optical fiber, planar light waveguide, from
By space etc..
The basic vector and actual decoded result adopted when measurement result that this utility model is obtained and decoding has certain right
(it is believed that in decoded result, carrying decoded result and measurement basic vector information) should be related to.For example：The survey that control unit is received
Amount result comes from phase decoding module, then it is assumed that use X basic vectors (or Y basic vectors) during decoding；Anyway, if measurement result is come
From in Z basic vector measure of time modules, then it is assumed that use Z basic vectors during decoding.
Therefore, control unit is according to decoded result and measures the corresponding relation between basic vector and measurement result, by surveying
Amount result carry out when post processing is obtained last solution code result and decoding the measurement basic vector that adopts for carry out basic vector comparison,
The processes such as error correction, privacy amplification further make transmitting terminal and receiving terminal form quantum key.
Decoding unit of the present utility model is independently arranged basic vector selecting module to select basic vector, constitutes structure by itself direct
Determine that the flashlight that receiving terminal is received enters phase measurement module or Z basic vector time decoder modules, can directly by setting
Count basic vector selecting module to adjust the second likelihood ratio.Therefore, this utility model is not controlled by third party, and it is general to be easily achieved second
The further flexibility of rate ratio, makes system into code check highest in order to adjust the second likelihood ratio according to practical situations, especially fits
For non-equilibrium basic vector selection scheme (i.e. the first likelihood ratio and the second likelihood ratio situation not for 1).
Basic vector selecting module can realize above-mentioned functions according to the combination of some optical devices, it is also possible to complete by single optical device
Into.Preferably, directly using the beam splitter of three ports as basic vector selecting module in this utility model, the strand-separating appts
Have an input, two be connected with phase measurement module respectively and the connection of Z basic vector measure of time module outfan, and and Z
The energy of the outfan output light of basic vector measure of time module connection is the ratio and second of the energy of another outfan output light
Likelihood ratio is corresponding：If the second likelihood ratio is to select the probability of Z basic vector measure of time modules general with selected phase measurement module
Rate ratio, then the ratio is equal with the second likelihood ratio, conversely, then the ratio is the inverse of the second likelihood ratio.When needing regulation second
During likelihood ratio, it is only necessary to be replaced by the beam splitter of corresponding splitting ratio.
The coding unit also includes the first beam splitting module, for described flashlight is divided into two the first subsignal lights of beam
And by being transmitted for phase code module in different light paths and Z basic vector time encoding modules are encoded.
Described phase code module makes two the first subsignals of beam for carrying out phase-modulation to two the first subsignal lights of beam
To complete coding, (when phase code module is as X basic vector phase codes, described phase contrast is the default phase contrast of presence of light
0 or π, when phase code module is Y basic vector phase codes, described phase contrast is pi/2 or 3 pi/2s), the Z basic vectors time compiles
It is 0 to complete that code module makes the intensity of first subsignal light of beam for carrying out intensity modulated to wherein a branch of first subsignal light
Coding.
Directly can arrange in the light path of the first subsignal light of two-way and be controlled by the intensity modulator and phase place of control unit
Manipulator is realized.For cost-effective, reduction insertion loss, a phase-modulator and an intensity modulator is only configured, the two
Can be installed in any one light path therein, the two installation position is mutually incoherent, can be installed in simultaneously in same light path,
Can also be installed in different light paths.
Preferably, the first beam splitting module is for being divided into the first equal subsignal of two beam energies by the flashlight
Light.
The energy of the first subsignal light of two-way is identical, now, the energy of the first subsignal light of two-way that receiving terminal is received
It is equal, using interference during phase decoding than highest, and then improve into code check.During practical application, due to two the first subsignals of beam
, may there are different losses in the discordance of optical transport to phase measurement module institute Jing light paths, therefore, it is to ensure receiving terminal
The two ways of optical signals energy coincidence that middle phase measurement module is received, the first beam splitting module is for the flashlight is divided into
Two beam energy ratios can be 1:1 nearby finely tunes by a small margin.In view of cost of implementation, in this utility model, the first beam splitting module is adopted and is divided
Beam ratio is close to 1：1 beam splitter is realized.
Two the first subsignal lights of beam occur time, phase place, polarization during transmitting to receiving terminal by different light paths
State etc. changes inconsistent situation, and then causes interference efficiency not high, and during due to being long-distance transmissions, the situation is more serious.For
The situation is avoided to occur, in quantum key dispatching system of the present utility model：Pass through one between the transmitting terminal and receiving terminal
Quantum channel is connected, and the coding unit also includes：
First time delay module, carries out relative time delay for two the first subsignal lights of beam to transmitting in different light paths；Close
Road module, is sent to receiving terminal by the quantum channel all the way afterwards for two described the first subsignal lights of beam are combined into.
Accordingly, the phase measurement module also includes：
Second beam splitting module, for being divided into two-way the second son letter by two the first subsignal lights of beam being combined into all the way for receiving
Number light is simultaneously exported by different light paths；Second time delay module, is matched with the first time delay module, for defeated to the second beam splitting module
The second subsignal light of two-way for going out carries out relative time delay to be interfered.
The second subsignal light of two-way can correspond to a branch of of two the first subsignal lights of beam respectively, and (i.e. wherein all the way second
Subsignal light is a branch of first subsignal light, and the second subsignal light of another road is the first subsignal light of another beam), or it is every
All include the part in two the first subsignal lights of beam all the way in second subsignal light, be specifically dependent upon system light path.
According to the composition per the second subsignal light all the way, interference can be partial coherence, or interfere completely.When two
The second subsignal light of road can correspond to a branch of of two the first subsignal lights of beam respectively, can be interfered completely.
First time delay module and the second time delay module carry out the duration of relative time delay without particular/special requirement, can be answered according to actual
Set with demand.However it is necessary that ensure that final the second subsignal light of two-way can be reached after the second time delay module time delay simultaneously
A certain position, it is ensured that can interfere carries out X basic vector decodings.
Preferably, the coding unit also includes Polarization Control Module, for adjusting the inclined of two the first subsignal lights of beam
Polarization state makes wherein a branch of for horizontal polarization light, and another beam is orthogonal polarized light.
Accordingly, the second described beam splitting module according to the polarization state of two the first subsignal lights of beam by combining after two beams
One subsignal light is divided into again the second subsignal light of two-way and is adjusted to unanimously the polarization state of the second subsignal light of two-way.
By adjust polarization state after carried out after Path selection according to the polarization state of light, phase measurement module beam splitting obtain two
The second subsignal light of road is actually two the first subsignal lights of beam after transmitting terminal combining, therefore interference efficiency when interfering is theoretical
On can reach 100%, code check is greatly improved into.
M- phase code device when this utility model additionally provides a kind of, including for forming the light source module of flashlight
And for carrying out the coding unit of coding time phase to the flashlight, described coding unit includes phase code module
With Z basic vector time encoding modules, the phase code module is X basic vector phase code modules or Y basic vector phase code modules.
When X basic vector phase code modules and Z basic vectors in practical application, when described, m- phase code device is according to first
Likelihood ratio makes a flashlight sent to light source in transmitting terminal in phase code module and Z basic vector time encoding modules at random
Encoded to be loaded onto on the flashlight and be sent to reception the random number that random number generation unit in transmitting terminal is produced
End.
Preferably, first likelihood ratio is not 0 and 1.Likelihood ratio is not 1, realizes non-equilibrium basic vector coding, improves into
Code check.
Preferably, code device time phase also includes the first beam splitting module, for described flashlight is divided
The first subsignal light transmitted in different light paths for two beams is so that phase code module and Z basic vector time encoding modules are compiled
Code.
Wherein, the first beam splitting module is for being divided into the first equal subsignal light of two beam energies by the flashlight.
Further preferably, code device time phase also includes：First time delay module, in different light paths
Two the first subsignal lights of beam of transmission carry out relative time delay；Combining module, for two described the first subsignal lights of beam are combined into
Send afterwards all the way.
More excellent, code device time phase also includes Polarization Control Module, for adjusting two the first subsignals of beam
The polarization state of light makes a branch of for horizontal polarization light, and another beam is orthogonal polarized light.
Polarization Control Module can only include a part, it is also possible to make the combination of multiple devices, and be multiple device groups
During conjunction, the plurality of device can become one, it is also possible to distinguish scattering device as needed in time phase code device
The diverse location of light path, further for ease of realizing device miniaturization, can be directly integrated into light path in a certain device.
M- phase decoding device when this utility model additionally provides a kind of, including for the elapsed time phase to receiving
The flashlight of position coding carries out the decoding unit of decoding time phase, when the decoding unit includes phase measurement module, Z basic vectors
Between measurement module and basic vector selecting module, the basic vector selecting module be used for the flashlight is input to into phase measurement mould at random
One in block and Z basic vector measure of time modules is measured to carry out corresponding decoding process, and the phase measurement module is X
Basic vector measurement module or Y basic vector measurement modules.
In this utility model basic vector selecting module for according to the second likelihood ratio will come from transmitting terminal optical signal input
Measure to complete corresponding decoding process in phase measurement module and Z basic vector measure of time modules.By solution
The decoded result that code is obtained carries measurement basic vector information.Preferably, second likelihood ratio is not 0 and 1.
Described when m- phase decoding device also includes：
Second beam splitting module, for being divided into two-way the second son letter by two the first subsignal lights of beam being combined into all the way for receiving
Number light is simultaneously exported by different light paths；Second time delay module, for the second subsignal light of two-way exported to the second beam splitting module
Carry out relative time delay to interfere.
Wherein, the second described beam splitting module according to the polarization state of two the first subsignal lights of beam by combining after two beams first
Subsignal light is divided into the second subsignal light of two-way again and the polarization state of just the second subsignal light of two-way is adjusted to unanimously.
Compared with prior art, this utility model has the advantage that：
Existing phase code system needs to add phase-modulator in the measurement part of receiving terminal, for selecting X or Y measurements
Basic vector, the phase-modulator for being added can bring extra insertion loss to reduce into code check.This utility model need not in receiving terminal
Plus phase-modulator, insertion loss can be substantially reduced, code check is improved into；
Existing phase code system needs to produce at a high speed with the non-equilibrium base of dynamoelectric signal active control using signal generator
The selection of arrow, it is relatively costly, and as device performance itself limits the accurate modulation of system phase, so as to reduce into code check.
This utility model can change reflected light as needed into Z basic vector time detecting module beam splitting ratios, without the need for actively modulation be
The efficient QKD schemes of the passive non-equilibrium basic vector of achievable measurement end.
Description of the drawings
Fig. 1 is the structured flowchart of the existing quantum key distribution system based on phase code；
Fig. 2 for embodiment 1 based on when m- phase code quantum key distribution system structured flowchart；
Fig. 3 a are the schematic diagrams of the coding unit of embodiment 2；
Fig. 3 b are the schematic diagrams of the phase measurement module of embodiment 2；
Fig. 4 a are the schematic diagrams of the coding unit of embodiment 3；
Fig. 4 b are the schematic diagrams of the decoding unit of embodiment 3；
Fig. 5 a are the schematic diagrams of the coding unit of embodiment 4；
Fig. 5 b are the schematic diagrams of the phase measurement module of embodiment 4；
Fig. 6 a are the schematic diagrams of the coding unit of embodiment 5；
Fig. 6 b are the schematic diagrams of the decoding unit of embodiment 5；
Fig. 7 a are the schematic diagrams of the coding unit of embodiment 6；
Fig. 7 b are the schematic diagrams of the phase measurement module of embodiment 6.
Specific embodiment
This utility model is further described by specific embodiment below in conjunction with the accompanying drawings.
Embodiment 1
As shown in Fig. 2 the present embodiment based on when m- phase code quantum key distribution system, including by quantum
Channel carries out the transmitting terminal (Alice) and receiving terminal (Bob) of mutual light connects, and transmitting terminal includes the light source for forming flashlight
Module and the coding unit for carrying out coded treatment time phase to flashlight, are correspondingly provided with receiving terminal for passing through
In transmitting terminal, coding unit carries out the flashlight after coded treatment time phase and carries out the decoding unit of decoding process time phase.
The quantum channel of the present embodiment is optical fiber, free space and slab guide.
In the present embodiment, light source module is light-pulse generator 1, is the weak coherent light source that state is inveigled in perfect single-photon source or combination,
The flashlight that can be sent is single photon pulses.
In practical application, randomizer, synchronous light source etc., and transmitting terminal in the transmitting terminal of QKD system, is additionally provided with
Corresponding main control unit is respectively equipped with receiving terminal with each ingredient in controlling receiving terminal and transmitting terminal (or unit, module)
Work and between transmitting terminal and the control unit of receiving terminal communicate to connect, information transmission can be carried out, and then complete quantum key
Distribution, to realize the quantum key of share in different areas between transmitting terminal and receiving terminal.
Coding unit includes Z basic vector time encoding modules and phase code module, and phase code module is compiled for X basic vectors phase place
Code module or Y basic vector phase code modules；Decoding unit includes Z basic vector measure of time modules and phase measurement module, and phase place is surveyed
Amount module is X basic vector phase measurement modules or Y basic vector phase measurement modules, and is mutually fitted with the phase code module in transmitting terminal
Should.
In this utility model, phase measurement module is interpreted as with the phase code module in transmitting terminal：
When phase code module is X basic vector phase code modules, phase measurement module should be X basic vector measurement modules；
Conversely, when phase code module is Y basic vector phase code modules, phase measurement module should be Y basic vector measurement modules.
To illustrate so that phase code module is for X basic vector phase code modules as an example below, for phase code module
Situation for Y basic vector phase code modules is repeated no more.
Coding unit also includes the first beam splitting module, and the flashlight for light source module is sent is divided into two beam the first son letters
Number light is simultaneously encoded for X phase codes module and Z basic vector time encoding modules by exporting in different light paths.And first point
Flashlight is divided into the first equal subsignal light of two beam energies by beam module.
In the present embodiment, the first beam splitting module is beam splitter 2, and its splitting ratio is 1:1 (actually can be 1:1 is micro- nearby
Adjust).Specifically as shown in Fig. 2 the beam splitter 2 includes three ports, respectively 2A, 2B, 2C, wherein 2A is input port, is used for
The flashlight of light source module output is received, 2B, 2C are respectively output port, two the first subsignal lights of beam for obtaining beam splitting respectively
Export in different light paths.
In the present embodiment, X basic vectors phase code module is realized based on phase-modulation principle, by via the first beam splitting mould
Block is divided into the first subsignal light of two beams carries out phase-modulation makes phase contrast therebetween complete phase code for 0 or π.
In the present embodiment, Z basic vectors time encoding module is realized based on intensity modulated principle, by sub to wherein a branch of first
Flashlight carry out intensity modulated make the intensity of first subsignal light of beam be close to 0 vacuum state, and further to two beams believe
Number light carries out relative time delay to realize difference and then deadline coding on the time.
Only one quantum channel between transmitting terminal and receiving terminal in the present embodiment.For ensureing that the flashlight after beam splitting can be
Transmit in same quantum channel, coding unit also includes combining module, after two the first subsignal lights of beam are combined into all the way
Receiving terminal is sent to by the quantum channel.
In the present embodiment, combining module is a beam splitter (beam splitter 5 in figure), and its splitting ratio is 1:1, three ports are provided with,
Respectively 5A, 5B and 5C, wherein, used as input port, 5A is used as output port for 5B, 5C.5B passes through phase-modulator 3 and time delay
Line 4 is connected with the port 2C of beam splitter 2, and 5C is connected with the port 2B of beam splitter 2.
As a kind of implementation of phase code：A phase can be set in wherein a branch of light path of two bundle subsignal lights
Position manipulator 3, also can be arranged on phase-modulator 3 in the light path after combining, i.e., in the 5A ports of beam splitter 5 and quantum channel
Between 7 to two bundle subsignal lights in a branch of phase-modulation that carries out make the phase contrast of two bundle subsignal lights reach 0 or π.
As shown in Fig. 2 intensity modulator is arranged in the light path after combining in the present embodiment, even if the 5A of beam splitter 5
Even intensity modulated is carried out so that the flashlight closed after beam is sent to intensity modulator 6 with intensity modulator phase 6.Now, Jing intensity
Flashlight after manipulator 6 is modulated directly is sent to receiving terminal via quantum channel 7.
As a kind of implementation of time encoding：
First time delay module is set in wherein a branch of light path of two bundle subsignal lights, for entering to two bundle subsignal lights
To differentiate on the time of carrying out, in the present embodiment, the first time delay module is delay line 4 to row relative time delay；
And two intensity modulators are set in the light path of two bundle subsignal lights or one is arranged in the light path after combining
Intensity modulator 6, to carry out intensity modulated.
In the present embodiment, phase-modulator and intensity modulator are controlled by the main control unit in transmitting terminal, and the two is in master control
Cooperateing with the control of unit carries out phase-modulation or intensity modulated to flashlight, for example, within the default time period, if to signal
Light has carried out phase-modulation, then no longer carry out intensity modulated to the flashlight.And phase-modulation or time are carried out to flashlight
Modulation completes random, and in the present embodiment, selected phase modulation is different with the probability of selection time modulation, but probability sum is 1.
As shown in Fig. 2 the decoding unit in receiving terminal includes phase measurement module and Z basic vector measure of time modules.For protecting
The optical signal that card is received carries out Path selection, and decoding unit is additionally provided with basic vector selecting module, and the basic vector selecting module is used for pressing
The optical signal (optical signal after elapsed time phase code) for coming from transmitting terminal is input to into phase place survey according to default likelihood ratio
One in amount module and Z basic vector measure of time modules measures to obtain carrying decoded result and measure basic vector information
Measurement result simultaneously feeds back to the control unit in receiving terminal.
In the present embodiment, basic vector selecting module is realized using beam splitter 8, and its splitting ratio is equal to default likelihood ratio, concrete root
Set with the likelihood ratio using time encoding using phase code according in transmitting terminal, and make probability into phase measurement module with
Into the probability of Z basic vector measure of time modules ratio be proportional in transmitting terminal using phase code probability and adopt time encoding
Probability ratio.
Beam splitter 8 is provided with 3 ports, respectively 8A, 8B and 8C, and wherein 8A is received by quantum channel 7 as input
From the flashlight (after elapsed time phase code) of transmitting terminal, 8B and 8C respectively with phase measurement module and Z basic vector times
Measurement module is connected with input signal light.
As flashlight is single photon pulses, according to the indivisible principle of single photon, will through the flashlight of beam splitter 8
Exported by 8B, or being exported by 8C.
As shown in Fig. 2 Z basic vector measure of time modules include a single-photon detector 12, the single-photon detector and conduct
Port 8C connections in the beam splitter 8 of basic vector selecting module carry out ionization meter with the flashlight to receiving.
Phase decoding is realized based on principle of interference, as shown in Fig. 2 the phase measurement module in the present embodiment includes second point
Beam module, the second time delay module, conjunction beam module and detector module.It is specific as follows：
Second beam splitting module, for being divided into two-way the second son letter by two the first subsignal lights of beam being combined into all the way for receiving
Number light is simultaneously exported by different light paths；
In the present embodiment, the second beam splitting module is directly realized using beam splitter (beam splitter 9), and beam splitter 9 is provided with 3 ports,
It is divided into 9A, 9B and 9C, wherein 9A is connected with the output port 8B of beam splitter 8 as input to receive flashlight, and 9B and 9C makees
For output port, the flashlight that 9A is received is divided into after two-way and is exported.
Second time delay module, is matched with the first time delay module, and the two-way second for exporting to the second beam splitting module is sub
Flashlight carries out relative time delay so that the second subsignal light of two-way can be interfered；
Identical with the first time delay module, the second time delay module is delay line 10, and the delay duration with the first time delay module
Identical, concrete delay duration is defined by ensureing that single-photon detector can be detected.As a kind of implementation, in the present embodiment
Delay line 10 is arranged in the light path all the way of 9C outputs of beam splitter 9.
Beam module is closed, for two-way the second subsignal combiner for separating the second beam splitting module interfering and by two
Plant result of interference and be divided into two-way output.Two kinds of result of interference refer to the phase contrast (corresponding first of the second subsignal light of two-way respectively
The phase contrast of subsignal light) result interfered when being 0 and phase contrast be result when π interferes.
Actually include two-beam in the present embodiment per the second subsignal light all the way, the two-beam corresponds respectively to two beams the
One subsignal light enters the part on the road after the second beam splitting module beam splitting.Therefore, the interference of the present embodiment is partial coherence.
Beam module is closed in the present embodiment realizes that splitting ratio is 1 using beam splitter 11:1, beam splitter is provided with 4 ports, respectively
For 11A, 11B, 11C and 11D, as receiving terminal, 11A is connected wherein 11A and 11C with the 9B of beam splitter 9, and 11C passes through time delay
Line 10 is connected with the 9C of beam splitter 9, and 11B and 11D is outfan, exports two kinds of result of interference respectively.
Detector module, measures for two kinds of different result of interference after the interference of pairing beam module output.
Two single-photon detectors, respectively single-photon detector 13 and monochromatic light are provided with the present embodiment in detector module
Sub- detector 14, separately detects from two kinds of different result of interference for closing beam module.In the present embodiment single-photon detector 13 with
The 11B connections of beam splitter 11 carry out ionization meter with the result exported to which, and single-photon detector 14 is connected with the 11D of beam splitter 11
The result for connecing to export which carries out ionization meter.
Under Z basic vectors, detection changes into bit value, X according to the presence or absence of the light pulse for receiving (whether receiving light pulse)
Under basic vector, detection is to change into bit value according to the different detectors of the different arrival of phase contrast, passes through classical letter after generating bit value
Road carries out the last handling processes such as basic vector comparison, error correction, privacy amplification and ultimately generates quantum key.
Embodiment 2
Same as Example 1, difference is that the present embodiment is sent using in polarization beam apparatus 5a alternate embodiments 1
The beam splitter 5 at end, wherein 5B is transmission end, 5C is reflection end, accordingly, is received using in polarization beam apparatus 9a alternate embodiments
The beam splitter 9 at end, wherein 9B is transmission end, 9C is reflection end, and sets up one 90 ° of polarizations between beam splitter 9 and delay line 10
Rotator 15, concrete transfer portion is referring to Fig. 3 a and Fig. 3 b.
In fact, 90 ° of polarization rotators 15 can be arranged in another light path of beam splitter output.
During work, coding and decoding methods are identical with embodiment 1, except for the difference that：
For transmitting terminal, the flashlight of the linear polarization that light-pulse generator sends forms two-way polarization through 2 beam splitting of beam splitter
The first subsignal light of information identical two input ports (5B and 5C) via different light paths arrival polarization beam apparatus 5a, two
Way flashlight obtains two beams through the transmission and reflection of polarization beam apparatus 5 and polarizes mutually perpendicular light pulse and from polarization beam splitting
The output port 5A outputs of device 5a.
For receiving terminal, the flashlight which receives is orthogonal first subsignal light of two beam polarization states, accordingly
Polarization beam apparatus 9a in phase measurement module is transmitted and is reflected to the flashlight for receiving according to polarization state, and then makes two
The first subsignal light of beam separates and transmits in different light paths respectively obtain the second subsignal light of two-way (two-way the second son letter
Number light is respectively two the first subsignals of beam), wherein effect polarization state of second subsignal light via 90 ° of polarization rotators 15 all the way
It is rotated by 90 °, makes the polarization state of two-way subsignal light consistent, and then can interferes at beam splitter 11, and for interfering completely.
Embodiment 3
Same as Example 2, difference is that the first of walk long distances (4 place light path of delay line) is sub in the present embodiment
Flashlight enters polarization beam apparatus 5a by reflector port 5B, and the first subsignal light for walking short circuit enters inclined through transmission port 5C
Shaking, (i.e. delay line 4 is connected beam splitter 5a with the reflector port 5B of polarization beam apparatus 5a, the 2B and polarization beam apparatus 5a of beam splitter 2
Transmission port 5C connection).
Accordingly, in order to finally interfere in two beam signal luminous energy of decoding unit, need to be in beam splitter 8 and polarization beam apparatus
Set up one 90 ° of polarization rotators 28 between 9a, the polarization state of two the first subsignal lights of beam be changed so that it is wherein a branch of from
Horizontal polarization light is changed into orthogonal polarized light, and another beam is changed into horizontal polarization light from orthogonal polarized light, and concrete transfer portion is referring to figure
4a and Fig. 4 b.
Embodiment 4
Same as Example 1, difference is, the present embodiment by the phase-modulator in embodiment 1, delay line, point
Beam device (in addition to beam splitter 8) is substituted using the inclined phase-modulator 3a of guarantor using inclined device replacement is protected accordingly, i.e., to be implemented
Phase-modulator 3, employing in example 1 is protected inclined polarization beam apparatus 5b, 9b and substitutes beam splitter 5 and 9 respectively, adopts polarization-maintaining beam splitter
4 and of delay line that 2a, 11a are substituted beam splitter 2 and 11 respectively, distinguished using guarantor inclined delay line 4a and 10a in alternate embodiment 1
10.Accordingly, the quantum channel of the present embodiment is only optical fiber.Referring specifically to shown in Fig. 5 a and Fig. 5 b.
During work, coding and decoding methods are identical with embodiment 1, except for the difference that：
For transmitting terminal, the flashlight of the linear polarization that light-pulse generator sends forms two beams through polarization-maintaining beam splitter 2a beam splitting
The first subsignal light of polarization information identical simultaneously reaches two inputs that polarization protects inclined polarization beam apparatus 5c via different light paths
Mouthful (5B and 5C), to obtain two beams polarization mutually perpendicular through the transmission and reflection of polarization beam apparatus 5c for two the first subsignal lights of beam
Light pulse is simultaneously exported from the output port 5A of polarization beam apparatus 5b.
For receiving terminal, the flashlight which receives is orthogonal first subsignal light of two beam polarization states, accordingly,
The inclined polarization beam apparatus 9c of guarantor in phase measurement module is transmitted and is reflected to the flashlight for receiving according to polarization state, and then
The polarization state that makes two the first subsignal lights of beam is identical, and transmit in being divided among different light paths and obtain the second subsignal light of two-way
(correspond to a branch of of two the first subsignal lights of beam in the second subsignal light of two-way all the way, believe for corresponding to two the first sons of beam all the way
Another beam of number light and polarization state is rotated by 90 °), and then can interfere at polarization-maintaining beam splitter 11a.
Embodiment 5
Same as Example 4, difference is, the of walk long distances (protecting inclined delay line 4a places light path) in the present embodiment
One subsignal light enters the reflector port 5B for protecting inclined polarization beam apparatus 5b through reflector port 5B, walks the first subsignal light of short circuit
Enter through transmission port 5C and protect inclined polarization beam apparatus 5b.
Accordingly, in order to finally interfere in two beam signal luminous energy of decoding unit, need to be in beam splitter 8 and polarization beam apparatus
Set up one 90 ° of polarization rotators 29 between 9b, the polarization state of two the first subsignal lights of beam be changed so that it is wherein a branch of from
Horizontal polarization light is changed into orthogonal polarized light, and another beam is changed into horizontal polarization light from orthogonal polarized light, and concrete transfer portion is referring to figure
6a and Fig. 6 b.
Embodiment 6
Same as Example 1, difference is, in the decoding unit in coding unit and receiving terminal in transmitting terminal
Phase measurement module is different.
As shown in Figure 7a, the coding unit of the present embodiment includes polarization beam apparatus 16, is provided with 4 ports, respectively 16A,
16B, 16C and 16D, wherein, 16A is connected with light-pulse generator, and 16B is connected with delay line 17 and 90 ° of faraday rotation mirrors 18 in turn,
16C includes phase-modulator 19 and 90 ° of faraday rotation mirrors 20 successively, and 16D is connected with intensity modulator 21, intensity modulated in turn
Device 21 is directly connected for the flashlight after coding to be sent to receiving terminal with quantum channel.
16A receives the flashlight that light-pulse generator 1 sends, and the flashlight beam splitting exported light-pulse generator 1 according to polarization state
Device is transmitted and is reflected so that the flashlight for receiving is divided into the orthogonal two-way of polarization state, and wherein transmissive portion is level
Polarized light, exports to corresponding light path from 16C, and reflecting part is orthogonal polarized light, is exported to corresponding light path from 16B.
The flashlight exported through 16C and 16B is acted on by corresponding 90 ° of faraday rotation mirrors in corresponding optical path, partially
Polarization state is back to polarization beam apparatus 16 along original optical path after being rotated by 90 °, wherein：The flashlight returned from 16B is changed into horizontal polarization
Light, all transmits, and exports from 16D；The flashlight returned from 16C is changed into orthogonal polarized light, all reflects, and exports from 16D.
And as the light path that 16B is connected is provided with delay line 17, therefore, final 16D can export two beam polarization states and be mutually perpendicular to, Yi Shuwei
Orthogonal polarized light, another beam are horizontal polarization light, and horizontal polarization light has time delay relative to orthogonal polarized light.
Accordingly, the decoding unit in receiving terminal should also carry out adaptations, the change of decoding unit in the present embodiment
It is phase measurement module, specifically as shown in Figure 7b.Phase measurement module includes polarization beam apparatus 22, is provided with 4 ports, respectively
For 22A, 22B, 22C and 22D, wherein 22A is connected with basic vector selecting module to connect flashlight, and 22B is connected with λ/2 wave plate 23 in turn
And detector module, 22C is connected with delay line 24 and 90 ° of faraday rotation mirrors 25 in turn, and 22D is connected with 90 ° of Faraday rotations
Mirror 26.
According to the work of coding unit, the flashlight that the 22A of polarization beam apparatus 22 is received includes two beam subsignals
Light, a branch of for orthogonal polarized light, another beam is horizontal polarization light, and horizontal polarization light has time delay relative to orthogonal polarized light.
The flashlight for receiving is divided into the output of two beams according to polarization state by 22A, specifically：
Orthogonal polarized light is reflected and is exported by 22C, after 24 time delay of delay line, then through 90 ° of faraday rotation mirrors
25 are adjusted to horizontal polarization light and are back to the 22C of polarization beam apparatus 22 along original optical path, export from 22B after directly transmiting.
Horizontal polarization light is transmitted and is exported by 22D, is adjusted to orthogonal polarized light and along former through 90 ° of faraday rotation mirrors 26
Light path is back to the 22D of polarization beam apparatus 22, exports from 22B after directly reflecting.
It can be seen that, there is no relative time delay in the horizontal polarization light and orthogonal polarized light of the 22B outputs of polarization beam apparatus 22,
The two is consistent in time.
In the present embodiment, two polarization basic vectors of the fast axle of λ/2 wave plate or slow-axis direction and polarization beam apparatus 22 are into 22.5 °
Or -22.5 ° of angles, equivalent projection measurement of the polarization beam apparatus 27 under H/V basic vectors that make be changed under+45 °/- 45 ° basic vectors
Interference between projections, and result of interference measured by detector module.
Claims (15)
1. it is a kind of based on when m- phase code quantum key distribution system, including the transmitting terminal and receiving terminal of mutual light connects,
Transmitting terminal includes the light source module for forming flashlight and for carrying out coded treatment time phase to the flashlight
Coding unit, is correspondingly provided with receiving terminal for carrying out after corresponding coded treatment time phase through coding unit in transmitting terminal
Flashlight carry out the decoding unit of decoding process time phase, it is characterised in that described coding unit includes the Z basic vector times
Coding module and phase code module, the phase code module are X basic vector phase code modules or Y basic vector phase code moulds
Block；The decoding unit includes Z basic vector measure of time modules and phase measurement module, and phase measurement module is surveyed for X basic vectors phase place
Amount module or Y basic vector phase measurement modules, and be adapted with the phase code module.
2. it is as claimed in claim 1 based on when m- phase code quantum key distribution system, it is characterised in that the volume
Code unit also include the first beam splitting module, for by the flashlight be divided into two the first subsignal lights of beam and pass through different light paths it is defeated
Go out and encoded for phase code module and Z basic vector time encoding modules.
3. it is as claimed in claim 2 based on when m- phase code quantum key distribution system, it is characterised in that described the
One beam splitting module is for being divided into the first equal subsignal light of two beam energies by the flashlight.
4. as described in Claims 2 or 3 based on when m- phase code quantum key distribution system, it is characterised in that institute
State by a quantum channel connection between transmitting terminal and receiving terminal, the coding unit also includes：First time delay module, is used for
Relative time delay is carried out to two the first subsignal lights of beam；Combining module, for two described the first subsignal lights of beam are combined into all the way
Receiving terminal is sent to by the quantum channel afterwards.
5. it is as claimed in claim 4 based on when m- phase code quantum key distribution system, it is characterised in that the phase
Position measurement module also includes：
Second beam splitting module, for being respectively divided into two-way the second son letter by two the first subsignal lights of beam being combined into all the way for receiving
Number light is simultaneously exported by different light paths；Second time delay module, is matched with the first time delay module, for defeated to the second beam splitting module
The second subsignal light of two-way for going out carries out relative time delay to be interfered.
6. it is as claimed in claim 5 based on when m- phase code quantum key distribution system, it is characterised in that the volume
Code unit also includes Polarization Control Module, and the polarization state for adjusting two the first subsignal lights of beam makes wherein a branch of for horizontal polarization
Light, another beam are orthogonal polarized light.
7. it is as claimed in claim 6 based on when m- phase code quantum key distribution system, it is characterised in that it is described
Second beam splitting module according to the polarization state of two the first subsignal lights of beam by combining after two the first subsignal lights of beam be divided into again two
The second subsignal light of road and the polarization state of the second subsignal light of two-way is adjusted to unanimously.
8. m- phase code device when a kind of, including for forming the light source module of flashlight and for the flashlight
Carry out the coding unit of coding time phase, it is characterised in that when described coding unit includes phase code module and Z basic vectors
Between coding module, the phase code module is X basic vector phase code modules or Y basic vector phase code modules.
9. m- phase code device when as claimed in claim 8, it is characterised in that the coding unit also includes first point
Beam module, for being divided into two the first subsignal lights of beam by described flashlight and being exported for phase code mould by different light paths
Block and Z basic vector time encoding modules are encoded.
10. m- phase code device when as claimed in claim 9, it is characterised in that the first beam splitting module is for by institute
State flashlight and be divided into the first equal subsignal light of two beam energies.
11. m- phase code devices when as claimed in claim 10, it is characterised in that also include：First time delay module, uses
Relative time delay is carried out in two the first subsignal lights of beam to exporting in the first beam splitting module；Combining module, for by described two
The first subsignal light of beam is combined into and sends afterwards all the way.
12. m- phase code devices when as claimed in claim 9, it is characterised in that also including Polarization Control Module, be used for
The polarization state for adjusting two the first subsignal lights of beam makes a branch of for horizontal polarization light, and another beam is orthogonal polarized light.
13. m- phase decoding devices when a kind of, when carrying out including the flashlight for the elapsed time phase code to receiving
Between phase decoding decoding unit, it is characterised in that the decoding unit includes phase measurement module, Z basic vector measure of time moulds
Block and basic vector selecting module, the basic vector selecting module are used for the flashlight to be input to phase measurement module and Z bases at random
One in arrow measure of time module is measured to carry out corresponding decoding process, and the phase measurement module is surveyed for X basic vectors
Amount module or Y basic vector measurement modules.
14. m- phase decoding devices when as claimed in claim 13, it is characterised in that also include：
Second beam splitting module, for being divided into the second subsignal light of two-way by two the first subsignal lights of beam being combined into all the way for receiving
And exported by different light paths；Second time delay module, for carrying out to the second subsignal light of two-way that the second beam splitting module is exported
Relative time delay is being interfered.
15. m- phase decoding devices when as claimed in claim 14, it is characterised in that the second described beam splitting module according to
The polarization state of two the first subsignal lights of beam by combining after two the first subsignal lights of beam be divided into again the second subsignal light of two-way and
The polarization state of the second subsignal light of two-way is adjusted to unanimously.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106161009A (en) * | 2016-08-19 | 2016-11-23 | 浙江神州量子网络科技有限公司 | Quantum key distribution system based on coding time phase and encoding apparatus and decoding apparatus |
| CN109150522A (en) * | 2018-10-29 | 2019-01-04 | 中国电子科技集团公司电子科学研究院 | Quantum key distribution time bit-phase decoding method and apparatus and corresponding system |
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2016
- 2016-08-19 CN CN201620925220.XU patent/CN206042013U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106161009A (en) * | 2016-08-19 | 2016-11-23 | 浙江神州量子网络科技有限公司 | Quantum key distribution system based on coding time phase and encoding apparatus and decoding apparatus |
| CN106161009B (en) * | 2016-08-19 | 2023-05-05 | 浙江神州量子网络科技有限公司 | Quantum key distribution system based on time-phase encoding |
| CN109150522A (en) * | 2018-10-29 | 2019-01-04 | 中国电子科技集团公司电子科学研究院 | Quantum key distribution time bit-phase decoding method and apparatus and corresponding system |
| CN109150522B (en) * | 2018-10-29 | 2024-03-26 | 中国电子科技集团公司电子科学研究院 | Quantum key distribution time bit-phase decoding method and device and corresponding system |
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