CN209218107U - Quantum key distribution time bit-phase decoding device and corresponding system - Google Patents
Quantum key distribution time bit-phase decoding device and corresponding system Download PDFInfo
- Publication number
- CN209218107U CN209218107U CN201821752612.6U CN201821752612U CN209218107U CN 209218107 U CN209218107 U CN 209218107U CN 201821752612 U CN201821752612 U CN 201821752612U CN 209218107 U CN209218107 U CN 209218107U
- Authority
- CN
- China
- Prior art keywords
- beam splitter
- phase
- polarization
- quantum key
- key distribution
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Optical Communication System (AREA)
Abstract
The utility model proposes quantum key distribution time bit-phase decoding devices and corresponding system based on polarized orthogonal rotary reflection.The device is used to carry out time bit-phase decoding to the input optical pulse of random polarization state, comprising: preposition beam splitter receives input optical pulse through input port and exports the two-way light pulse obtained by input optical pulse beam splitting through two output ports；With the phase decoder of one of the two output ports optical coupling, merge the two strip optical paths with two reflection unit optical couplings respectively including the first beam splitter, two reflection units and with the first beam splitter optocoupler, two of them reflection unit is polarized orthogonal rotary reflection device；Positioned at preposition beam splitter front end or positioned at the first beam splitter front end or the phase-modulator in one of two strip optical paths.The utility model provides a kind of time bit-phase code quantum key distribution decoding scheme of anti-polarization induction decline for being easily achieved and applying using polarized orthogonal rotary reflection.
Description
Technical field
The utility model relates to optical transport private communication technology fields, more particularly to one kind to be based on polarized orthogonal rotary reflection
Quantum key distribution time bit-phase decoding method, apparatus and the quantum key distribution system including the device.
Background technique
Quantum Secure Communication is the forward position focus field that quantum physics are combined with information science.Based on quantum key
Distribution technology and one time cryptosystem principle, quantum secret communication can be in the safe transmissions of overt channel realization information.Quantum is close
Key distribution can be realized based on physical principles such as quantum mechanics Heisenberg uncertainty relationship, quantum non-clone principles in user
Between safely shared key, and can detecte potential eavesdropping behavior, it is contour to can be applied to national defence, government affairs, finance, electric power
The field of security information transmission demand.
Time bit-phase code quantum key distribution uses one group of time base and one group of phase base, and time base uses two
The time mode of a different time position encodes, and phase base is encoded using two phase differences of front and back light pulse.Ground amount
Quantum key distribution is based primarily upon fibre channel transmission, and optical fiber fabrication there are the non-circular symmetrical, fiber core refractive indexs in section radially not
Equal non-idealities are uniformly distributed, and optical fiber is influenced by temperature, strain, bending etc. in the actual environment, can generated random double
Refraction effect.It is influenced by optical fiber random birefringence, when light pulse reaches receiving end after long-distance optical fiber transmits, polarization state
It can occur to change at random.Time base decoding in time bit-phase code is not influenced by polarization state variation, however phase base
When interfering decoding, because of the influence of transmission fiber and decoding interferometer fiber birefringence, there are problems that polarization induction decline, lead
It causes decoding interference unstable, causes the bit error rate to increase, need to increase correcting device, increase system complexity and cost, and right
Stable application is difficult to realize in strong jammings situations such as aerial optical cable, road and bridge optical cables.For quantum key distribution time bit-phase
Encoding scheme, how to carry out to stability and high efficiency phase interference decoding is to carry out quantum secret communication based on existing optical cable infrastructure
The hot spot and problem of application.
Utility model content
The main purpose of the utility model is that when proposing a kind of quantum key distribution based on polarized orthogonal rotary reflection
Between bit-phase decoding method and apparatus, to solve phase base decoding in the application of time bit-phase code quantum key distribution
When because polarization induction decline caused by phase decoding interfere unstable problem.
The utility model provides at least following technical scheme:
1. a kind of quantum key distribution time bit-phase decoding device based on polarized orthogonal rotary reflection, for pair
The input optical pulse all the way of incident random polarization state carries out time bit-phase decoding, which is characterized in that the decoding apparatus
Include:
There is input port and two output ports, the input port to be used for for preposition beam splitter, the preposition beam splitter
The input optical pulse is received, described two output ports are respectively used to export the two-way obtained by the input optical pulse beam splitting
Light pulse；And
With the phase decoder of an output port optical coupling in described two output ports of the preposition beam splitter,
The phase decoder include the first beam splitter, two reflection units and merge with the first beam splitter optocoupler respectively with institute
The two strip optical paths of two reflection unit optical couplings are stated, first beam splitter is coupled to described two through the two strips optical path
Reflection unit, wherein described two reflection units are polarized orthogonal rotary reflection device,
Wherein the decoding apparatus have positioned at the preposition beam splitter front end or be located at first beam splitter front end or
The phase-modulator of any sub-light road in the two strips optical path,
Wherein the phase-modulator is used to randomly carry out 0 degree of phase-modulation or 180 degree phase to by its light pulse
Position modulation.
2. quantum key distribution time bit-phase decoding according to scheme 1 based on polarized orthogonal rotary reflection
Device, which is characterized in that described two reflection units are the orthogonal rotary reflection device of circular polarization.
3. quantum key distribution time bit-phase decoding according to scheme 2 based on polarized orthogonal rotary reflection
Device, which is characterized in that described two reflection units respectively include reflecting mirror.
4. according to the quantum key distribution time bit-based on polarized orthogonal rotary reflection any in scheme 1 to 3
Phase decoding device, which is characterized in that first beam splitter is round polarization-maintaining beam splitter.
5. quantum key distribution time bit-phase decoding according to scheme 1 based on polarized orthogonal rotary reflection
Device, which is characterized in that described two reflection units are the orthogonal rotary reflection device of linear polarization.
6. quantum key distribution time bit-phase decoding according to scheme 5 based on polarized orthogonal rotary reflection
Device, which is characterized in that described two reflection units respectively include reflecting mirror and quarter-wave plate, and the reflecting mirror is described four
/ mono- wave plate rear end is integrally formed with the quarter-wave plate, wherein the quarter-wave plate is configured so that through institute
State the polarization direction of one of respective two orthogonal polarisation states of two-way sub-light pulse of two strip optic paths with described four/
The fast axle of one wave plate or the angle of slow axis are 45 degree.
7. quantum key distribution time bit-phase according to scheme 1 or 5 or 6 based on polarized orthogonal rotary reflection
Position decoding apparatus, which is characterized in that first beam splitter is line polarization-maintaining beam splitter.
8. quantum key distribution time bit-phase decoding according to scheme 1 based on polarized orthogonal rotary reflection
Device, which is characterized in that described two reflection units are the orthogonal rotary reflection device of elliptical polarization.
9. quantum key distribution time bit-phase solution according to scheme 1 or 8 based on polarized orthogonal rotary reflection
Code device, which is characterized in that first beam splitter is oval polarization-maintaining beam splitter.
10. according to the quantum key distribution based on polarized orthogonal rotary reflection any in scheme 1,2,3,5,6 and 8
Time bit-phase decoding device, which is characterized in that the two strips optical path is that polarization keeps optical path, the two strips optical path
On optical device be that polarization keeps optical device and/or non-birefringent optical device.
11. quantum key distribution time bit-phase solution according to scheme 1 based on polarized orthogonal rotary reflection
Code device, which is characterized in that described two reflection units respectively include 90 degree of rotation faraday's reflecting mirrors, and first beam splitter is
Polarization-maintaining beam splitter or non-polarization-maintaining beam splitter.
12. quantum key distribution time bit-phase solution according to scheme 1 based on polarized orthogonal rotary reflection
Code device, which is characterized in that the decoding apparatus further includes the second beam splitter, and second beam splitter is optically coupled to described preposition
Another output mouth in described two output ports of beam splitter.
13. a kind of quantum key distribution system, which is characterized in that the quantum key distribution system includes:
According to the quantum key distribution time bit-based on polarized orthogonal rotary reflection any in scheme 1~12
The receiving end of the quantum key distribution system is arranged in phase decoding device, is used for time bit-phase decoding；And/or
According to the quantum key distribution time bit-based on polarized orthogonal rotary reflection any in scheme 1~12
The transmitting terminal of the quantum key distribution system is arranged in phase decoding device, is used for time bit-phase code.
The utility model realizes unexpected beneficial effect by creative configuration.For time bit-phase
Quantum key distribution application is encoded, the utility model utilizes two of light pulse in the control phase base decoding of polarized orthogonal rotary reflection
The phase difference of each comfortable decoding interference ring two-arm transmission of a orthogonal polarisation state is equal, realizes the two orthogonal polarisation states simultaneously defeated
Exit port effectively interferes output, is achieved in the immune phase base decoding function of environmental disturbances, makes it possible to realize stable ring
The immune time bit-phase code quantum key distribution solution of border interference.The utility model provides one kind and is easy to real
Now and the anti-polarization of application induces time bit-phase code quantum key distribution solution of decline, while avoiding to multiple
The needs of miscellaneous correcting device.
Detailed description of the invention
Fig. 1 is the quantum key distribution time ratio based on polarized orthogonal rotary reflection of one preferred embodiment of the utility model
Spy-phase decoding method flow chart；
Fig. 2 is the quantum key distribution time ratio based on polarized orthogonal rotary reflection of one preferred embodiment of the utility model
Spy-phase decoding device composed structure schematic diagram；
Fig. 3 is the quantum key distribution time based on polarized orthogonal rotary reflection of another preferred embodiment of the utility model
Bit-phase decoding device composed structure schematic diagram；
Fig. 4 is the quantum key distribution time based on polarized orthogonal rotary reflection of another preferred embodiment of the utility model
Bit-phase decoding device composed structure schematic diagram；
Fig. 5 is the quantum key distribution time based on polarized orthogonal rotary reflection of another preferred embodiment of the utility model
Bit-phase decoding device composed structure schematic diagram.
Specific embodiment
Specifically describe the preferred embodiment of the utility model with reference to the accompanying drawing, wherein attached drawing constitutes the application one
Point, and be used to illustrate the principles of the present invention together with the embodiments of the present invention.For purpose of clarity and simplification, when it
When the theme of the utility model may be made smudgy, to the detailed specific of the known function and structure of device described herein
Illustrate to omit.
A kind of quantum key distribution time ratio based on polarized orthogonal rotary reflection of one preferred embodiment of the utility model
Spy-phase decoding method is as shown in Figure 1, comprising the following steps:
Step S101: being first via light pulse and the second tunnel by the beam splitting of input optical pulse all the way of incident random polarization state
Light pulse.
Incident input optical pulse is random polarization state, can be linear polarization, circular polarization or elliptical polarization
Complete polarized light is also possible to partial poolarized light or non-polarized light.
Step S102: according to quantum key distribution agreement, phase decoding is carried out to the first via light pulse and to described
Second tunnel light pulse carries out the decoding of time bit.
As skilled in the art will understand, it can regard as per light pulse all the way and be made of two orthogonal polarisation states.From
So, the two-way sub-light pulse obtained by light pulse beam splitting all the way can also be regarded as equally by two identical with the road light pulse
Orthogonal polarisation state composition.
According to the utility model, phase decoding is carried out to the first via light pulse can include:
By the first via light pulse through beam splitter beam splitting be the pulse of two-way sub-light；And
Respectively along two-way sub-light pulse described in two strip optic paths, and the two-way sub-light pulse is subjected to relative time delay
The beam splitter is reflected back to close beam output by the beam splitter through two reflection units respectively afterwards, wherein for the two-way
Each way light pulse in sub-light pulse:
The two of the way light pulse when way light pulse is reflected through the corresponding reflection unit in described two reflection units
A orthogonal polarisation state makees polarized orthogonal rotary reflection, so that after the reflection via the corresponding reflection unit, the way light pulse
Each orthogonal polarisation state be transformed into orthogonal to that polarization state.
For example, it is assumed that the two orthogonal polarisation states are respectively x-polarisation state and y-polarisation state, along optic path to one
It is inclined that the x-polarisation state of reflection unit is transformed into orthogonal to that polarization state i.e. y at reflection unit after polarized orthogonal rotary reflection
Polarization state, along the y-polarisation state of optic path to the reflection unit be transformed into after polarized orthogonal rotary reflection at reflection unit with
Its orthogonal polarization state, that is, x-polarisation state.
In this way, using the polarized orthogonal rotary reflection at reflection unit, the x-polarisation state for every light pulse all the way that beam splitting obtains
The phase difference through the two strips optic path is exactly equal to the light pulse during beam is closed in beam splitter beam splitting to beam splitter
Y-polarisation state beam splitter beam splitting to beam splitter close beam during the phase difference through the two strips optic path.
In the method, the pulse of two-way sub-light is reflected through two reflection unit reflection odd-times or respectively through two respectively
Device, which reflected after even-times (containing zero degree, i.e., directly transmit), closes beam output by the beam splitter.
In the method for Fig. 1, in the process for carrying out phase decoding according to quantum key distribution agreement to first via light pulse
In carry out phase-modulation as described below: before first via light pulse beam splitting, to first via light pulse according to quantum key distribution
Agreement carries out phase-modulation；Alternatively, being uploaded during beam is closed in beam splitter beam splitting to beam splitter in the two strips optical path
At least one of defeated two-way sub-light pulse carries out phase-modulation according to quantum key distribution agreement.In the previous case, example
Such as, carrying out phase-modulation according to quantum key distribution agreement to first via light pulse can be by adjacent in the road light pulse
One of former and later two input optical pulses carry out phase-modulation to realize.
Here, relative time delay and phase-modulation are carried out according to the requirement and regulation of quantum key distribution agreement, are not made herein
It is described in detail.
According to a kind of possible configuration, above-mentioned two reflection unit is the orthogonal rotary reflection device of circular polarization.For example, above-mentioned
Two reflection units respectively include reflecting mirror.In this case, above-mentioned beam splitter can be round polarization-maintaining beam splitter.Here, circle is inclined
The orthogonal rotary reflection device that shakes is to refer to make incident circular polarization state light polarized orthogonal rotary reflection, reflecting incidence
By the polarization conversion of the circular polarization state light at the reflection unit of orthogonal to that polarization state when circular polarization state light, it may be assumed that incident
Left circularly polarized light is transformed into orthogonal to that right-circularly polarized light after the orthogonal rotary reflection device reflection of the circular polarization, enters
The right-circularly polarized light penetrated is transformed into orthogonal to that Left-hand circular polarization after the orthogonal rotary reflection device reflection of the circular polarization
Light.
According to alternatively possible configuration, above-mentioned two reflection unit is the orthogonal rotary reflection device of linear polarization.On for example,
Stating two reflection units respectively includes reflecting mirror and quarter-wave plate, and the reflecting mirror is in the quarter-wave plate rear end and institute
It states quarter-wave plate to be integrally formed, wherein the polarization side of one of respective two orthogonal polarisation states of the two-way sub-light pulse
Angle to fast axle or slow axis with the quarter-wave plate is 45 degree.In this case, above-mentioned beam splitter can be line
Polarization-maintaining beam splitter.This reflection unit including reflecting mirror and quarter-wave plate can referred to as " quarter-wave plate reflection
Mirror ", can be by plating reflecting mirror realization in quarter-wave plate plane of crystal, also can be by transmitting phase phase difference in fast and slow axis
90 degree of polarization maintaining optical fibre end face plating reflecting mirror is realized.Here, the orthogonal rotary reflection device of linear polarization is referred to incident line
Polarization state light makees polarized orthogonal rotary reflection, becomes the polarization state of the linear polarization light in the incident linear polarization light of reflection
Change the reflection unit of orthogonal to that polarization state into, it may be assumed that incident x linearly polarized light is filled through the orthogonal rotary reflection of the linear polarization
It is transformed into orthogonal to that y linearly polarized light after setting reflection, incident y linearly polarized light is through the orthogonal rotary reflection device of the linear polarization
Orthogonal to that x linearly polarized light is transformed into after reflection.
According to another possible configuration, above-mentioned two reflection unit is the orthogonal rotary reflection device of elliptical polarization, above-mentioned
Beam splitter can be oval polarization-maintaining beam splitter.In such a case, it is possible to which according to specific oval polarization-maintaining beam splitter, selection is suitble to
Reflection unit.Here, the orthogonal rotary reflection device of elliptical polarization is to refer to polarize just incident elliptical polarization light
Hand over rotary reflection, i.e. reflection incidence elliptical polarization light when by the polarization conversion of the elliptical polarization light at orthogonal to that
Polarization state reflection unit, it may be assumed that incident left-handed elliptically polarized light is reflected through the orthogonal rotary reflection device of the elliptical polarization
It is transformed into orthogonal to that right-handed elliptical polarization light afterwards, incident right-handed elliptical polarization light is anti-through the orthogonal rotation of the elliptical polarization
Orthogonal to that left-handed elliptically polarized light is transformed into after injection device reflection.
It is every in the two-way sub-light pulse obtained advantageously for first via light pulse beam splitting for above several configurations
Sub-light pulse all the way: two orthogonal polarisation states of the way light pulse are kept to fill in the beam splitter beam splitting to the corresponding reflection
It is remained unchanged during setting reflection, and reflexes to during the beam splitter closes beam and remain unchanged in the corresponding reflection unit.This can
For example by configuring polarization holding optical path for the two strips optical path and configuring the optical device in the two strips optical path
Optical device and/or non-birefringent optical device is kept to realize for polarization.
According to also a kind of possible configuration, above-mentioned two reflection unit respectively includes 90 degree of rotation faraday's reflecting mirrors.At this
In the case of kind, above-mentioned beam splitter can be polarization-maintaining beam splitter or non-polarization-maintaining beam splitter.
To first via light pulse according to quantum key distribution agreement carry out phase-modulation can include: to first via light pulse with
Carry out to machine 0 degree of phase-modulation or 180 degree phase-modulation.To in the two-way sub-light pulse transmitted in the two strips optical path extremely
It is one of few to carry out phase-modulation according to quantum key distribution agreement can include: to two ways transmitted in the two strips optical path
One of light pulse randomly carries out 0 degree of phase-modulation or 180 degree phase-modulation.Here, randomly carry out 0 degree of phase-modulation or
180 degree phase-modulation refers to the phase-modulation randomly carried out in 0 degree of phase-modulation and 180 degree phase-modulation the two.
In the method for Fig. 1, carrying out the decoding of time bit to second tunnel light pulse includes: by the second road Guang Mai
Punching directly output is for detecting；Or output after the second tunnel light pulse beam splitting is used to detect.
A kind of quantum key distribution time ratio based on polarized orthogonal rotary reflection of one preferred embodiment of the utility model
Spy-phase decoding device is as shown in Fig. 2, include consisting of part: preposition beam splitter 201, beam splitter 202 and 205, phase tune
Device 206 and two reflection units 207 and 208 processed.Two strip optical paths between beam splitter 205 and two reflection units 207 and
Between 208, merge with 205 optocoupler of beam splitter respectively with two optical couplings of reflection unit 207 and 208.In one of two strip optical paths
It is provided with phase-modulator 206.205, two reflection units 207 and 208 of beam splitter and two strip optical paths therebetween totally may be used
Referred to as phase decoder.Two reflection units 207 and 208 are respectively a polarized orthogonal rotary reflection device.
Here, polarized orthogonal rotary reflection device refers to that one kind can be to two orthogonal polarisation states of the light pulse reflected
Make polarized orthogonal rotary reflection, i.e. in the incident light pulse of reflection by each orthogonal polarisation state of the light pulse be transformed into and its
The reflection unit of orthogonal polarization state.
Preposition beam splitter 201 is used to the beam splitting of input optical pulse all the way of incident random polarization state be two-way light pulse.
Phase decoder and preposition 201 optical coupling of beam splitter, for receiving the light pulse all the way in above-mentioned two-way light pulse
And phase decoding is carried out to it.For convenience, this all the way light pulse be hereinafter also referred to be first via light pulse.
Beam splitter 202 and preposition 201 optical coupling of beam splitter, for receiving the another way light arteries and veins in above-mentioned two-way light pulse
Punching, and output after the another way light pulse beam splitting is used to carry out time bit decoding.Here, it should be noted that beam splitter
202 be optional.The another way light pulse is directly exported by preposition beam splitter 201 and is used to carry out time bit to decode to be possible
's.
Phase decoder constitutes unequal arm Michelson's interferometer, in which:
Beam splitter 205 is used to the first via light pulse beam splitting be the pulse of two-way sub-light；
The two strips optical path is used to transmit the two-way sub-light pulse respectively, and for realizing the two-way sub-light pulse
Relative time delay；
Phase-modulator 206 is used to carry out phase-modulation according to quantum key distribution agreement to the sub-light pulse by it；
Two reflection units 207 and 208 through the two strips optic path for respectively by coming from beam splitter 205
The two-way sub-light pulse-echo returns the beam splitter to close beam output by the beam splitter.
Since two reflection units 207 and 208 are polarized orthogonal rotary reflection device, for first via light pulse beam splitting
Obtained each way light pulse in two-way sub-light pulse: the way light pulse is through corresponding anti-in described two reflection units
Two orthogonal polarisation states of the way light pulse make polarized orthogonal rotary reflection when injection device reflects, so that via described corresponding anti-
After the reflection of injection device, each orthogonal polarisation state of the way light pulse is transformed into orthogonal to that polarization state.
It can be by adjusting optical path any in two strip optical paths between beam splitter 205 and two reflection units 207 and 208
Physical length realizes the relative time delay of two-way sub-light pulse.
Phase-modulator 206 can be used for randomly carrying out 0 degree of phase-modulation or 180 degree of phases to by its light pulse
Modulation.Phase-modulator 206 can be the unrelated phase-modulator of polarization or polarization dependent phase modulator.
Unrelated phase-modulator is polarized to be suitable for carrying out identical phase-modulation to two orthogonal polarisation states of light pulse, so
It referred to as polarizes unrelated.For example, polarize unrelated phase-modulator can by the series connection of two birefringent phase modulators or
Parallel connection is realized.According to circumstances, phase-modulation can be realized by a variety of specific meanss.For example, these means can include: modulation
The length of the free space optical path perhaps length of modulation optical fiber or using serial or parallel connection optical waveguide phase-modulator etc..Example
Such as, desired phase-modulation can be realized by changing the length of free space optical path with motor.It for another example, can be by utilizing piezoelectricity
The fiber stretcher of effect carrys out the length of modulation optical fiber, is achieved in phase-modulation.In addition, phase-modulator, which can be, is suitable for electricity
The other types of voltage-controlled system, it is orthogonal partially come two to light pulse to unrelated phase-modulator is polarized by applying suitable voltage
Polarization state carries out identical phase-modulation, it can be achieved that desired phase-modulation.
Dependent phase modulator such as birefringent phase modulator is polarized, suitable for applying to by its two orthogonal polarisation states
Add different adjustable phase-modulations.For example, birefringent phase modulator can be lithium niobate phase modulator, applied by control
The voltage of lithium columbate crystal is added to, two orthogonal polarisation states by the lithium niobate phase modulator can be respectively subjected to
Phase-modulation is controlled and is adjusted.
Although Fig. 2 shows in the upper setting phase-modulator of one of two strip optical paths, i.e., in 205 beam splitting of beam splitter to conjunction beam
One of two-way sub-light pulse obtained in the process to first via light pulse beam splitting carries out phase according to quantum key distribution agreement
Modulation, but it is also possible that 205 front end of beam splitter be arranged phase-modulator, i.e., before first via light pulse beam splitting according to
Quantum key distribution agreement carries out phase-modulation to it.Furthermore, it is also possible that phase is arranged before preposition beam splitter 201
Modulator carries out phase-modulation to incident input optical pulse all the way.
In addition, although showing phase decoder in Fig. 2 with only one phase-modulator, in beam splitter 205 and two
Be arranged in every strip optical path in two strip optical paths between a reflection unit 207 and 208 phase-modulator be also can
Can.In setting there are two in the case where phase-modulator, the difference for the phase that two phase-modulators are modulated is by quantum key
Distribution protocol determines.
Above-mentioned phase decoder can optionally have following setting:
A) two reflection units 207 and 208 are the orthogonal rotary reflection device of circular polarization, such as two 207 Hes of reflection unit
208 respectively include reflecting mirror；Beam splitter 205 is round polarization-maintaining beam splitter.
B) two reflection units 207 and 208 are the orthogonal rotary reflection device of linear polarization, such as two 207 Hes of reflection unit
208 include respectively reflecting mirror and quarter-wave plate, and the reflecting mirror is in the quarter-wave plate rear end and a quarter
Wave plate is integrally formed, wherein the polarization direction and described four of one of respective two orthogonal polarisation states of the two-way sub-light pulse
The fast axle of/mono- wave plate or the angle of slow axis are 45 degree；Beam splitter 205 is line polarization-maintaining beam splitter.
C) two reflection units 207 and 208 are the orthogonal rotary reflection device of elliptical polarization；Beam splitter 205 is oval polarization-maintaining
Beam splitter.In such a case, it is possible to select suitable reflection unit according to specific oval polarization-maintaining beam splitter.
D) two reflection units 207 and 208 respectively include 90 degree of rotation faraday's reflecting mirrors；Beam splitter 205 is polarization-maintaining beam splitting
Device or non-polarization-maintaining beam splitter.
Using setting a), b) or c), advantageously, in phase decoder, for first via light pulse point
Each way light pulse in two-way sub-light pulse that beam obtains: keep two orthogonal polarisation states of the way light pulse in beam splitting
Device beam splitting remains unchanged during reflecting to corresponding reflection unit, and reflexes to the beam splitter in the corresponding reflection unit and close beam
Period remains unchanged.This for example can keep optical path and by two sub-lights by configuring polarization for the two strips optical path
The optical device of road is configured to polarization and optical device and/or non-birefringent optical device is kept to realize.
The unequal arm Michelson's interferometer that phase decoder is constituted can be polarization-maintaining unequal arm Michelson's interferometer
Or non-polarization-maintaining unequal arm Michelson's interferometer, depend on concrete configuration.
As needed, the decoding apparatus of Fig. 2 can also include optical circulator.Before the optical circulator can be located at beam splitter 205
End.In the case, the input port and output port for the unequal arm Michelson's interferometer that phase decoder is constituted can
For same port.First via light pulse from preposition beam splitter 201 can input and from the ring of light from the first port of optical circulator
The second port of shape device is exported to beam splitter 205, and the conjunction beam output from beam splitter 205 can be input to the second end of optical circulator
Mouth is simultaneously exported from the third port of optical circulator.
A kind of quantum key distribution time based on polarized orthogonal rotary reflection of another preferred embodiment of the utility model
Bit-phase decoding device is as shown in figure 3, include consisting of part: beam splitter 303 and 304, polarization-maintaining beam splitter 307, phase
Modulator 308 and reflecting mirror 309 and 310.Polarization-maintaining beam splitter 307 is circle polarization-maintaining optical fiber beam splitter.
Beam splitter 303 is used as preposition beam splitter, input terminal of one of two ports 301 and 302 of one side as device
Mouthful.Beam splitter 304 will be exported after the beam splitting of light pulse all the way from beam splitter 303 by port 305 or 306.Polarization-maintaining beam splitter
307 and reflecting mirror 309,310 form polarization-maintaining unequal arm Michelson's interferometer, two strip optical paths therebetween are polarization maintaining optical fibre light
Road.Phase-modulator 308 is inserted into any arm in the two-arm of polarization-maintaining unequal arm Michelson's interferometer.Polarization-maintaining unequal arm is inputted to step
It is exported after the light pulse of Ke Erxun interferometer is decoded by port 311.
When work, input optical pulse enters beam splitter 303 through the port 301 or 302 of beam splitter 303, and by beam splitter 303
It is divided into two-way light pulse to be transmitted.Light pulse all the way from beam splitter 303 is input to beam splitter 304, and by beam splitter 304
It is exported through port 305 or 306 for carrying out time bit decoding after beam splitting.Another way light pulse input from beam splitter 303
It is the pulse of two-way sub-light to polarization-maintaining beam splitter 307, and by 307 beam splitting of polarization-maintaining beam splitter.The phase modulated device of sub-light pulse all the way
It is reflected after 308 0 degree of Stochastic Modulations or 180 degree phase by reflecting mirror 309, another way sub-light pulse is directly passed through polarization maintaining optical fibre
It transports to reflecting mirror 310 and is reflected by reflecting mirror 310.Reflected two-way sub-light pulse through relative time delay is through polarization-maintaining point
Beam device 307 is exported after closing beam by port 311.
A kind of quantum key distribution time based on polarized orthogonal rotary reflection of another preferred embodiment of the utility model
Bit-phase decoding device is as shown in figure 4, include consisting of part: beam splitter 403 and 404, polarization-maintaining beam splitter 407, phase
Modulator 408 and quarter-wave plate reflecting mirror 409 and 410.Quarter-wave plate reflecting mirror 409 and 410 can be four points
One of wave plate plane of crystal plating reflecting mirror realize, also can by fast and slow axis transmit 90 degree of phase phase difference polarization maintaining optical fibre end face plate reflection
Mirror is realized.With the fast axle or slow axis and corresponding a quarter of the polarization maintaining optical fibre that quarter-wave plate reflecting mirror 409 and 410 connects
The fast axle of wave plate or the angle of slow axis are 45 degree.Polarization-maintaining beam splitter 407 is line polarization-maintaining optical fiber beam splitter.
Beam splitter 403 is used as preposition beam splitter, input terminal of one of two ports 401 and 402 of one side as device
Mouthful.Beam splitter 404 exports the beam splitting of light pulse all the way from beam splitter 403 through port 405 or 406 after two-way.Polarization-maintaining point
Beam device 407 and quarter-wave plate reflecting mirror 409,410 form polarization-maintaining unequal arm Michelson's interferometer, two sub-lights therebetween
Road is polarization maintaining optical fibre optical path.Phase-modulator 408 is inserted into any arm in the two-arm of polarization-maintaining unequal arm Michelson's interferometer.It is defeated
Enter polarization-maintaining unequal arm Michelson's interferometer light pulse it is decoded after exported by port 411.
When work, input optical pulse enters beam splitter 403 through the port 401 or 402 of beam splitter 403, and by beam splitter 403
It is divided into two-way light pulse to be transmitted.Light pulse all the way from beam splitter 403 is input to beam splitter 404, and by beam splitter 404
It is exported through port 405 or 406 for carrying out time bit decoding after beam splitting.Another way light pulse input from beam splitter 403
It is the pulse of two-way sub-light to polarization-maintaining beam splitter 407, and by 407 beam splitting of polarization-maintaining beam splitter.The phase modulated device of sub-light pulse all the way
It is reflected after 408 0 degree of Stochastic Modulations or 180 degree phase by quarter-wave plate reflecting mirror 409, another way sub-light pulse is direct
Quarter-wave plate reflecting mirror 410 is transmitted to through polarization maintaining optical fibre and is reflected by quarter-wave plate reflecting mirror 410.Through opposite
The reflected two-way sub-light pulse of delay is exported after polarization-maintaining beam splitter 407 closes beam by port 411.
A kind of quantum key distribution time based on polarized orthogonal rotary reflection of another preferred embodiment of the utility model
Bit-phase decoding device is as shown in figure 5, include consisting of part: beam splitter 503 and 504, polarization-maintaining beam splitter 507, phase
Modulator 508 and 90 degree of rotation faraday reflecting mirrors 509 and 510.
Beam splitter 503 is used as preposition beam splitter, input terminal of one of two ports 501 and 502 of one side as device
Mouthful.Beam splitter 504 will be exported after the beam splitting of light pulse all the way from beam splitter 503 by port 505 or 506.Polarization-maintaining beam splitter
507 and 90 degree of rotation faraday reflecting mirrors 509,510 form polarization-maintaining unequal arm Michelson's interferometer, two strip optical paths therebetween
For polarization maintaining optical fibre optical path.Phase-modulator 508 is inserted into any arm in the two-arm of polarization-maintaining unequal arm Michelson's interferometer.It is defeated
Enter polarization-maintaining unequal arm Michelson's interferometer light pulse it is decoded after exported by port 511.
When work, input optical pulse enters beam splitter 503 through the port 501 or 502 of beam splitter 503, and by beam splitter 503
It is divided into two-way light pulse to be transmitted.Light pulse all the way from beam splitter 503 is input to beam splitter 504, and by beam splitter 504
It is exported after beam splitting through port 505 or 506.Another way light pulse from beam splitter 503 is input to polarization-maintaining beam splitter 507, and by
507 beam splitting of polarization-maintaining beam splitter is the pulse of two-way sub-light.0 degree of phase modulated 508 Stochastic Modulation of device of sub-light pulse or 180 degree all the way
It is reflected after phase by 90 degree of rotation faraday reflecting mirrors 509, another way sub-light pulse is directly transmitted to 90 through polarization maintaining optical fibre
Degree rotation faraday's reflecting mirror 510 is simultaneously reflected by 90 degree of rotation faraday reflecting mirrors 510.Reflecting through relative time delay
The pulse of two-way sub-light exported after polarization-maintaining beam splitter 507 closes beam by port 511.
Although described above is the unequal arm Michelson's interferometers in Fig. 5 to use polarization-maintaining beam splitter 507 and polarization maintaining optical fibre
Optical path, but for the unequal arm Michelson's interferometer, polarization-maintaining beam splitter 507 can be replaced with non-polarization-maintaining coupler, and/or use
Non PM fiber replaces polarization maintaining optical fibre optical path.
For the decoding apparatus of Fig. 3 to Fig. 5, optical circulator can be optionally used.For example, for Fig. 3 to Fig. 5's
Optical circulator can be arranged in the optical path between preposition beam splitter and polarization-maintaining beam splitter in embodiment, so that above-mentioned from preposition
The another way light pulse of beam splitter from the first port of the optical circulator input and from the second port of the optical circulator export to
Polarization-maintaining beam splitter, the conjunction beam output from polarization-maintaining beam splitter are input to the second port of the optical circulator and from the optical circulator
Third port output；In this case, the output port of unequal arm Michelson's interferometer can be same with input port
Port, and port 311, the port 411 in Fig. 4, the port 511 in Fig. 5 being not limited in Fig. 3.
Herein, term " beam splitter " and " bundling device " are used interchangeably, and beam splitter is also referred to as and as bundling device, instead
?.Herein, " polarization maintaining optical fibre optical path " refers to the optical path or polarization maintaining optical fibre connection shape using polarization maintaining optical fibre transmission light pulse
At optical path.
Can the receiving end of quantum key distribution system configure the utility model based on polarized orthogonal rotary reflection
Quantum key distribution time bit-phase decoding device is used for time bit-phase decoding.Alternatively, it is also possible in quantum key
The transmitting terminal of dissemination system configures the quantum key distribution time bit-phase based on polarized orthogonal rotary reflection of the utility model
Position decoding apparatus, is used for time bit-phase code.
It should be able to be the technology hand reaching predetermined purpose and being taken to the utility model by the explanation of specific embodiment
Section and effect have more deeply and it is specific understand, however appended diagram is only to provide reference and description and is used, and is not used to pair
The utility model limits.
Claims (13)
1. a kind of quantum key distribution time bit-phase decoding device based on polarized orthogonal rotary reflection, for incidence
Random polarization state input optical pulse all the way carry out time bit-phase decoding, which is characterized in that the decoding apparatus packet
It includes:
Preposition beam splitter, the preposition beam splitter have input port and two output ports, and the input port is for receiving
The input optical pulse, described two output ports are respectively used to export the two-way light arteries and veins obtained by the input optical pulse beam splitting
Punching；And
It is described with the phase decoder of an output port optical coupling in described two output ports of the preposition beam splitter
Phase decoder includes the first beam splitter, two reflection units and merges with the first beam splitter optocoupler respectively with described two
Two strip optical paths of a reflection unit optical coupling, first beam splitter are coupled to described two reflections through the two strips optical path
Device, wherein described two reflection units are polarized orthogonal rotary reflection device,
Wherein the decoding apparatus has positioned at the preposition beam splitter front end or positioned at first beam splitter front end or is located at
The phase-modulator of any sub-light road in the two strips optical path,
Wherein the phase-modulator is used to randomly carry out 0 degree of phase-modulation or 180 degree phase tune to by its light pulse
System.
2. quantum key distribution time bit-phase decoding according to claim 1 based on polarized orthogonal rotary reflection
Device, which is characterized in that described two reflection units are the orthogonal rotary reflection device of circular polarization.
3. quantum key distribution time bit-phase decoding according to claim 2 based on polarized orthogonal rotary reflection
Device, which is characterized in that described two reflection units respectively include reflecting mirror.
4. the quantum key distribution time ratio according to any one of claim 1 to 3 based on polarized orthogonal rotary reflection
Spy-phase decoding device, which is characterized in that first beam splitter is round polarization-maintaining beam splitter.
5. quantum key distribution time bit-phase decoding according to claim 1 based on polarized orthogonal rotary reflection
Device, which is characterized in that described two reflection units are the orthogonal rotary reflection device of linear polarization.
6. quantum key distribution time bit-phase decoding according to claim 5 based on polarized orthogonal rotary reflection
Device, which is characterized in that described two reflection units respectively include reflecting mirror and quarter-wave plate, and the reflecting mirror is described four
/ mono- wave plate rear end is integrally formed with the quarter-wave plate, wherein the quarter-wave plate is configured so that through institute
State the polarization direction of one of respective two orthogonal polarisation states of two-way sub-light pulse of two strip optic paths with described four/
The fast axle of one wave plate or the angle of slow axis are 45 degree.
7. quantum key distribution time bit-phase described according to claim 1 or 5 or 6 based on polarized orthogonal rotary reflection
Position decoding apparatus, which is characterized in that first beam splitter is line polarization-maintaining beam splitter.
8. quantum key distribution time bit-phase decoding according to claim 1 based on polarized orthogonal rotary reflection
Device, which is characterized in that described two reflection units are the orthogonal rotary reflection device of elliptical polarization.
9. quantum key distribution time bit-phase solution based on polarized orthogonal rotary reflection according to claim 1 or 8
Code device, which is characterized in that first beam splitter is oval polarization-maintaining beam splitter.
10. the according to claim 1, quantum key described in any one of 2,3,5,6 and 8 based on polarized orthogonal rotary reflection point
Send out time bit-phase decoding device, which is characterized in that the two strips optical path is that polarization keeps optical path, two sub-lights
The optical device of road is that polarization keeps optical device and/or non-birefringent optical device.
11. quantum key distribution time bit-phase decoding according to claim 1 based on polarized orthogonal rotary reflection
Device, which is characterized in that described two reflection units respectively include 90 degree of rotation faraday's reflecting mirrors, and first beam splitter is to protect
Inclined beam splitter or non-polarization-maintaining beam splitter.
12. quantum key distribution time bit-phase decoding according to claim 1 based on polarized orthogonal rotary reflection
Device, which is characterized in that the decoding apparatus further includes the second beam splitter, and second beam splitter is optically coupled to described preposition point
Another output mouth in described two output ports of beam device.
13. a kind of quantum key distribution system, which is characterized in that the quantum key distribution system includes:
Quantum key distribution time ratio described according to claim 1~any one of 12 based on polarized orthogonal rotary reflection
Spy-phase decoding device, is arranged in the receiving end of the quantum key distribution system, is used for time bit-phase decoding；
And/or
Quantum key distribution time ratio described according to claim 1~any one of 12 based on polarized orthogonal rotary reflection
Spy-phase decoding device, is arranged in the transmitting terminal of the quantum key distribution system, is used for time bit-phase code.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821752612.6U CN209218107U (en) | 2018-10-29 | 2018-10-29 | Quantum key distribution time bit-phase decoding device and corresponding system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821752612.6U CN209218107U (en) | 2018-10-29 | 2018-10-29 | Quantum key distribution time bit-phase decoding device and corresponding system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209218107U true CN209218107U (en) | 2019-08-06 |
Family
ID=67457096
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821752612.6U Active CN209218107U (en) | 2018-10-29 | 2018-10-29 | Quantum key distribution time bit-phase decoding device and corresponding system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209218107U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109039617A (en) * | 2018-10-29 | 2018-12-18 | 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 |
-
2018
- 2018-10-29 CN CN201821752612.6U patent/CN209218107U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109039617A (en) * | 2018-10-29 | 2018-12-18 | 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 |
| CN109039617B (en) * | 2018-10-29 | 2024-05-03 | 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 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109150525A (en) | Quantum key distribution phase decoding method and apparatus and corresponding system | |
| CN109150522A (en) | Quantum key distribution time bit-phase decoding method and apparatus and corresponding system | |
| CN109039617A (en) | Quantum key distribution time bit-phase decoding method and apparatus and corresponding system | |
| CN109104277A (en) | HVDC Modulation quantum key distribution phase decoding method and apparatus and corresponding system | |
| WO2020182059A1 (en) | Quantum key distribution phase encoder/decoder, corresponding encoding/decoding device and system | |
| CN109120403A (en) | HVDC Modulation quantum key distribution phase decoding method, apparatus and system based on polarized orthogonal rotation | |
| CN109039625A (en) | Quantum key distribution time bit-phase decoding method, apparatus and system based on polarized orthogonal rotation | |
| CN109039621A (en) | HVDC Modulation quantum key distribution phase decoding method and apparatus and corresponding system | |
| CN109039618A (en) | Quantum key distribution phase decoding method and apparatus and corresponding system | |
| CN209134429U (en) | Phase decoding device and quantum key distribution system based on 90 degree of welding difference control | |
| CN109067531A (en) | Phase decoding method, apparatus and quantum key distribution system based on 90 degree of welding difference control | |
| CN209218107U (en) | Quantum key distribution time bit-phase decoding device and corresponding system | |
| CN209120198U (en) | Divide the quantum key distribution phase decoding device and corresponding system of polarization difference control | |
| CN209201092U (en) | Divide the HVDC Modulation quantum key distribution phase decoding device and corresponding system of polarization difference control | |
| CN209330134U (en) | Quantum key distribution time bit-phase decoding device and corresponding system | |
| CN209218106U (en) | HVDC Modulation quantum key distribution phase decoding device and corresponding system | |
| CN109039620A (en) | quantum key distribution time bit-Phase decoding method and apparatus and corresponding system | |
| CN209233846U (en) | Differ the quantum key distribution time bit-phase decoding device and corresponding system of control | |
| CN209659320U (en) | Quantum key distribution phase codec, corresponding coding and decoding device and system | |
| CN209659321U (en) | Quantum key distribution phase codec, corresponding coding and decoding device and system | |
| CN209218113U (en) | Quantum key distribution phase decoding device and quantum key distribution system based on polarized orthogonal rotation | |
| CN209659322U (en) | Quantum key distribution phase codec, corresponding coding and decoding device and system | |
| CN209233847U (en) | Quantum key distribution time bit-phase decoding apparatus and system based on polarized orthogonal rotation | |
| WO2020182055A1 (en) | Quantum key distribution phase encoder/decoder, corresponding encoding/decoding device and system | |
| CN209170393U (en) | HVDC Modulation quantum key distribution phase decoding device and quantum key distribution system based on polarized orthogonal rotation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |