CN209218106U - HVDC Modulation quantum key distribution phase decoding device and corresponding system - Google Patents
HVDC Modulation quantum key distribution phase decoding device and corresponding system Download PDFInfo
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Abstract
The utility model proposes a kind of HVDC Modulation quantum key distribution phase decoding device and corresponding system based on polarized orthogonal rotary reflection.The phase decoding device is used to carry out HVDC Modulation phase decoding to the input optical pulse all the way of random polarization state, include: preposition beam splitter, receives input optical pulse through input port and export the two-way light pulse obtained by input optical pulse beam splitting through two output ports；It is coupled respectively to the first phase decoder and second phase decoder of two output ports of preposition beam splitter.Each phase decoder includes beam splitter, two reflection units, merges the two strip optical paths with two reflection unit optical couplings respectively with beam splitter optocoupler, and the direct current phase-modulator in one of two strip optical paths, two of them reflection unit are polarized orthogonal rotary reflection device.The utility model provides a kind of 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
HVDC Modulation quantum key distribution 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.
Currently, the encoding scheme of quantum key distribution mainly uses polarization encoder and phase code.Ground quantum key point
Hair is based primarily upon fibre channel transmission, and there are the non-circular symmetrical, fiber core refractive index in section radially uneven distributions for optical fiber fabrication
Equal non-idealities, and optical fiber is influenced by temperature, strain, bending etc. in the actual environment, can generate random birefringence effect.
It when using polarization encoder, is influenced by optical fiber random birefringence, the quantum state of polarization encoder reaches after long-distance optical fiber transmits
When receiving end, light pulse polarization state can occur to change at random, and the bit error rate is caused to increase, and result in the need for increasing correcting device, increase
System complexity and cost, and stable application is difficult to realize for strong jammings situations such as aerial optical cable, road and bridge optical cables.Compared to inclined
Vibration coding, the phase difference of phase code light pulse before and after is come encoded information, energy during long-distance optical fiber transmission
Enough stablize keeps.However for phase encoding scheme, when interfering decoding, because transmission fiber and encoding and decoding interferometer optical fiber are two-fold
There is polarization induction decline, cause decoding interference unstable in the influence penetrated.Equally, if increasing correcting device, although only
It needs to rectify a deviation to a kind of polarization state, but also will increase system complexity and cost.For quantum key distribution phase code
Scheme, how to carry out to stability and high efficiency interference decoding is that the heat of quantum secret communication application is carried out based on existing optical cable infrastructure
Point and problem.
Utility model content
The main purpose of the utility model is that proposing that a kind of HVDC Modulation quantum based on polarized orthogonal rotary reflection is close
Key distributes phase decoding method and apparatus, to solve phase caused by polarization induction declines in the application of phase code quantum key distribution
Unstable problem is interfered in position decoding.
The utility model provides at least following technical scheme:
1. a kind of HVDC Modulation quantum key distribution phase decoding device based on polarized orthogonal rotary reflection, for appointing
The input optical pulse all the way for polarization state of anticipating carries out HVDC Modulation phase decoding, which is characterized in that the phase decoding device includes:
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；
With the first phase solution of an output port optical coupling in described two output ports of the preposition beam splitter
Code device, the first phase decoder include the first beam splitter, two the first reflection units and with the first beam splitter light
Couple and respectively with two the first sub-light roads of described two first reflection unit optical couplings, first beam splitter is through described two
The first sub-light of item road is coupled to described two first reflection units, wherein described two first reflection units are polarized orthogonal rotation
Reflection unit；
With the second phase of the another output mouth optical coupling in described two output ports of the preposition beam splitter
Decoder, the second phase decoder include the second beam splitter, two the second reflection units and with second beam splitter
Optocoupler merge respectively with two the second sub-light roads of described two second reflection unit optical couplings, described in second beam splitter warp
Two the second sub-light roads are coupled to described two second reflection units, wherein described two second reflection units are polarized orthogonal rotation
Turn reflection unit,
Wherein the first phase decoder has the direct current phase being located at least one of described two first sub-light roads
Position modulator and/or the second phase decoder have the direct current being located at least one of described two second sub-light roads
Phase-modulator.
2. the HVDC Modulation quantum key distribution phase decoding dress according to scheme 1 based on polarized orthogonal rotary reflection
It sets, which is characterized in that
Described two first reflection units are the orthogonal rotary reflection device of circular polarization；And/or
Described two second reflection units are the orthogonal rotary reflection device of circular polarization.
3. the HVDC Modulation quantum key distribution phase decoding according to scheme 2 based on polarized orthogonal rotary reflection fills
It sets, which is characterized in that
Described two first reflection units respectively include reflecting mirror；And/or
Described two second reflection units respectively include reflecting mirror.
4. according to the HVDC Modulation quantum key distribution 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；And/or
Second beam splitter is round polarization-maintaining beam splitter.
5. the HVDC Modulation quantum key distribution phase decoding dress according to scheme 1 based on polarized orthogonal rotary reflection
It sets, which is characterized in that
Described two first reflection units are the orthogonal rotary reflection device of linear polarization；And/or
Described two second reflection units are the orthogonal rotary reflection device of linear polarization.
6. the HVDC Modulation quantum key distribution phase decoding according to scheme 5 based on polarized orthogonal rotary reflection fills
It sets, which is characterized in that
Described two first reflection units respectively include the first reflecting mirror and the first quarter-wave plate, first reflecting mirror
It is integrally formed in first quarter-wave plate rear end and first quarter-wave plate, wherein described the first four/
One wave plate be configured so that respective two orthogonal polarisation states of two-way sub-light pulse through two first sub- optic paths it
The angle of the fast axle or slow axis of one polarization direction and first quarter-wave plate is 45 degree；And/or
Described two second reflection units respectively include the second reflecting mirror and the second quarter-wave plate, second reflecting mirror
It is integrally formed in second quarter-wave plate rear end and second quarter-wave plate, wherein described the second four/
One wave plate be configured so that respective two orthogonal polarisation states of two-way sub-light pulse through two second sub- optic paths it
The angle of the fast axle or slow axis of one polarization direction and second quarter-wave plate is 45 degree.
7. the HVDC Modulation quantum key distribution phase according to scheme 1 or 5 or 6 based on polarized orthogonal rotary reflection
Decoding apparatus, which is characterized in that
First beam splitter is line polarization-maintaining beam splitter；And/or
Second beam splitter is line polarization-maintaining beam splitter.
8. the HVDC Modulation quantum key distribution phase decoding dress according to scheme 1 based on polarized orthogonal rotary reflection
It sets, which is characterized in that
Described two first reflection units are the orthogonal rotary reflection device of elliptical polarization；And/or
Described two second reflection units are the orthogonal rotary reflection device of elliptical polarization.
9. the HVDC Modulation quantum key distribution 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；And/or
Second beam splitter is oval polarization-maintaining beam splitter.
10. according to the HVDC Modulation quantum based on polarized orthogonal rotary reflection any in scheme 1 to 3,5,6 and 8
Key distributes phase decoding device, which is characterized in that
Two first sub-light roads are that polarization keeps optical path, and the optical device of two first sub-light roads is that polarization is protected
Hold optical device and/or non-birefringent optical device；And/or
Two second sub-light roads are that polarization keeps optical path, and the optical device of two second sub-light roads is that polarization is protected
Hold optical device and/or non-birefringent optical device.
11. the HVDC Modulation quantum key distribution phase decoding according to scheme 1 based on polarized orthogonal rotary reflection
Device, which is characterized in that
Described two first reflection units respectively include 90 degree of rotation faraday's reflecting mirrors, and first beam splitter is polarization-maintaining point
Beam device or non-polarization-maintaining beam splitter；And/or
Described two second reflection units respectively include 90 degree of rotation faraday's reflecting mirrors, and second beam splitter is polarization-maintaining point
Beam device or non-polarization-maintaining beam splitter.
12. a kind of quantum key distribution system, which is characterized in that the quantum key distribution system includes:
According to the HVDC Modulation quantum key distribution phase based on polarized orthogonal rotary reflection any in scheme 1~11
Position decoding apparatus, is arranged in the receiving end of the quantum key distribution system, is used for phase decoding；And/or
According to the HVDC Modulation quantum key distribution phase based on polarized orthogonal rotary reflection any in scheme 1~11
Position decoding apparatus, is arranged in the transmitting terminal of the quantum key distribution system, is used for phase code.
The utility model is by creative configuration, just using two of polarized orthogonal rotary reflection control input optical pulse
Hand over the phase difference of each comfortable decoding interference ring two-arm transmission of polarization state equal, so that two of the input optical pulse of random polarization state
Orthogonal polarisation state can stablize interference output, it is thus achieved that unexpected beneficial effect.Using the embodiment of the utility model,
The input optical pulse of random polarization state may be implemented to stablize interference output at decoding interference ring, solve phase code
Quantum key distribution application in polarization induction decline cause system can not steady operation the problem of.In addition, by will in receiving end
Input optical pulse beam splitting is carries out phase decoding to this two-way light pulse respectively after two-way light pulse, during phase decoding
Direct current is carried out to every road light pulse and selects keynote system, it may be advantageous to reduce and select the relevant requirement of phase-modulation when base with decoding, especially
It avoids decoding for High Speed System and high-speed phase modulation when base is selected to require.The utility model provides one kind and is easy to
The phase code quantum key distribution decoding scheme of the anti-polarization induction decline of implementation and application.
Detailed description of the invention
Fig. 1 is the HVDC Modulation quantum key based on polarized orthogonal rotary reflection point of one preferred embodiment of the utility model
Send out the flow chart of phase decoding method；
Fig. 2 is the HVDC Modulation quantum key based on polarized orthogonal rotary reflection point of one preferred embodiment of the utility model
Send out the composed structure schematic diagram of phase decoding device；
Fig. 3 is the HVDC Modulation quantum key based on polarized orthogonal rotary reflection of another preferred embodiment of the utility model
Distribute the composed structure schematic diagram of phase decoding device；
Fig. 4 is the HVDC Modulation quantum key based on polarized orthogonal rotary reflection of another preferred embodiment of the utility model
Distribute the composed structure schematic diagram of phase decoding device；
Fig. 5 is the HVDC Modulation quantum key based on polarized orthogonal rotary reflection of another preferred embodiment of the utility model
Distribute the composed structure schematic diagram of phase decoding device.
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 HVDC Modulation quantum key based on polarized orthogonal rotary reflection of one preferred embodiment of the utility model point
It is as shown in Figure 1 to send out phase decoding method, 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.
It can be two-way light pulse by 50:50 beam splitting by the input optical pulse all the way of incident random polarization state.
Step S102: the first via light pulse and the second tunnel light pulse are carried out according to quantum key distribution agreement respectively
Phase decoding.
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, the first via light pulse and the second tunnel light pulse are assisted according to quantum key distribution respectively
View carries out phase decoding can include:
For in the first via light pulse and the second tunnel light pulse per light pulse all the way,
By the road 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 two optic paths is exactly equal to the y of the light pulse during beam is closed in beam splitter beam splitting to beam splitter
Polarization state phase difference through two optic paths during beam is closed in beam splitter beam splitting to beam splitter.
In the method, corresponding two-way sub-light pulse is respectively through two reflection unit reflection odd-times or respectively through two
Beam output is closed by corresponding beam splitter after a reflection unit reflection even-times (containing zero degree, i.e., directly transmit).
In the method for Fig. 1, respectively to the first via light pulse and the second tunnel light pulse according to quantum key distribution
Agreement carries out carrying out phase-modulation as described below during phase decoding: closing beam in the beam splitter beam splitting to the beam splitter
Period, at least one of two-way sub-light pulse that the first via light pulse beam splitting is obtained according to quantum key distribution agreement into
At least one of row direct current phase-modulation, and/or the two-way sub-light pulse that obtains to the second tunnel light pulse beam splitting are according to amount
Quantum key distribution agreement carries out direct current phase-modulation.
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, for every light arteries and veins all the way in the first via light pulse and the second tunnel light pulse
Punching: above-mentioned two reflection unit is the orthogonal rotary reflection device of circular polarization, such as above-mentioned two reflection unit respectively includes reflecting mirror；
Above-mentioned beam splitter is round polarization-maintaining beam splitter.Here, the orthogonal rotary reflection device of circular polarization is referred to incident circular polarization state
Light make polarized orthogonal rotary reflection, i.e. in the incident circular polarization state light of reflection by the polarization conversion of the circular polarization state light at
The reflection unit of its orthogonal polarization state, it may be assumed that incident left circularly polarized light is anti-through the orthogonal rotary reflection device of the circular polarization
Orthogonal to that right-circularly polarized light is transformed into after penetrating, incident right-circularly polarized light is filled through the orthogonal rotary reflection of the circular polarization
Orthogonal to that left circularly polarized light is transformed into after setting reflection.
According to alternatively possible configuration, for every light arteries and veins all the way in the first via light pulse and the second tunnel light pulse
Punching: above-mentioned two reflection unit is the orthogonal rotary reflection device of linear polarization, such as above-mentioned two reflection unit respectively includes reflecting mirror
And quarter-wave plate, the reflecting mirror are integrally formed in the quarter-wave plate rear end with the quarter-wave plate,
The wherein fast axle of the polarization direction of one of respective two orthogonal polarisation states of the two-way light pulse and the quarter-wave plate
Or the angle of slow axis is 45 degree；Above-mentioned beam splitter is line polarization-maintaining beam splitter.It is this anti-including reflecting mirror and quarter-wave plate
Injection device can referred to as " quarter-wave plate reflecting mirror ", can be real by plating reflecting mirror in quarter-wave plate plane of crystal
It is existing, also reflecting mirror realization can be plated by transmitting 90 degree of phase phase difference of polarization maintaining optical fibre end face in fast and slow axis.Here, linear polarization is orthogonal
Rotary reflection device is to refer to make incident linear polarization light polarized orthogonal rotary reflection, linear polarization i.e. incident in reflection
By the polarization conversion of the linear polarization light at the reflection unit of orthogonal to that polarization state when state light, it may be assumed that incident x linear polarization
Light is transformed into orthogonal to that y linearly polarized light, incident y linearly polarized light after the orthogonal rotary reflection device reflection of the linear polarization
Orthogonal to that x linearly polarized light is transformed into after the orthogonal rotary reflection device reflection of the linear polarization.
According to another possible configuration, for every light arteries and veins all the way in the first via light pulse and the second tunnel light pulse
Punching: 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 select suitable reflection unit according to specific oval polarization-maintaining beam splitter.Here, elliptical polarization is being just
Handing over rotary reflection device is to refer to make incident elliptical polarization light polarized orthogonal rotary reflection, reflecting the ellipse of incidence
By the polarization conversion of the elliptical polarization light at the reflection unit of orthogonal to that polarization state when circular polarization state light, it may be assumed that incident
Left-handed elliptically polarized light be transformed into orthogonal to that right-handed elliptical after the elliptical polarization orthogonal rotary reflection device reflection
Polarised light, incident right-handed elliptical polarization light are transformed into orthogonal to that after the orthogonal rotary reflection device reflection of the elliptical polarization
Left-handed elliptically polarized light.
For above several configurations, advantageously for every light arteries and veins all the way in first via light pulse and the second tunnel light pulse
The each way light pulse rushed in the two-way sub-light pulse that beam splitting obtains: two orthogonal polarisation states of the way light pulse are kept to exist
The beam splitter beam splitting is remained unchanged to during the corresponding reflection unit reflection, and reflexes to institute in the corresponding reflection unit
It states during beam splitter closes beam and remains unchanged.This can be for example by configuring polarization holding optical path for the two strips optical path and inciting somebody to action
Optical device in the two strips optical path is configured to polarization and optical device and/or non-birefringent optical device is kept to realize.
According to also a kind of possible configuration, for every light arteries and veins all the way in the first via light pulse and the second tunnel light pulse
Punching: above-mentioned two reflection unit respectively includes 90 degree of rotation faraday's reflecting mirrors；Above-mentioned beam splitter is polarization-maintaining beam splitter or non-polarization-maintaining
Beam splitter.
The two-way sub-light pulse that the beam splitting of light pulse all the way in the first via light pulse and the second tunnel light pulse is obtained
At least one of made by direct current phase-modulation with to the another way light arteries and veins in the first via light pulse and the second tunnel light pulse
Can be differed by rushing the made direct current phase-modulation of at least one of the two-way sub-light pulse that beam splitting obtains by 90 degree.
A kind of HVDC Modulation quantum key based on polarized orthogonal rotary reflection of one preferred embodiment of the utility model point
Phase decoding device is sent out as shown in Fig. 2, including consisting of part: preposition beam splitter 201, the first and second optical circulators 202
With the 209, first and second beam splitters 203 and 210, the first and second direct current phase-modulators 204 and 211 and two first
Reflection unit 205 and 206 and two the second reflection units 212 and 213.
First and second optical circulators 202 and 209 are optional；Preposition beam splitter 201 and it in beam splitter 203 and 210
It does not include optical circulator between one or both is possible.
Preposition beam splitter 201 and the optical circulator of beam splitter 203 and 210 between the two are omitted, then the phase decoding of Fig. 2
Device includes: preposition beam splitter 201；First the first reflection unit 205 and 206 of beam splitter 203, two and with the first beam splitting
203 optocoupler of device merges two the first sub-light roads with two the first optical couplings of reflection unit 205 and 206 respectively；And second
210, two the second reflection units 212 and 213 of beam splitter and merge with 210 optocoupler of the second beam splitter respectively with two second
Two the second sub-light roads of the optical coupling of reflection unit 212 and 213.The first direct current phase is provided on one of two first sub-light roads
Position modulator 204, is provided with the second direct current phase-modulator 211 on one of two second sub-light roads.First beam splitter 203, two
A first reflection unit 205 and 206 and two the first sub-light roads totally can be described as first phase decoder, the second beam splitter
210, two the second reflection units 212 and 213 and two the second sub-light roads totally can be described as second phase decoder.Two
One reflection unit 205 and 206 is respectively a polarized orthogonal rotary reflection device.Two the second reflection units 212 and 213 are respectively one
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 first via light pulse
With the second tunnel light pulse.
First phase decoder and preposition 201 optical coupling of beam splitter, for carrying out phase solution to the first via light pulse
Code.
Second phase decoder and preposition 201 optical coupling of beam splitter, for carrying out phase solution to second tunnel light pulse
Code.
The first phase decoder constitutes the first unequal arm Michelson's interferometer, in which:
First beam splitter 203 is used to the first via light pulse beam splitting be the pulse of the first sub-light of two-way；
Two first sub-light roads are used to transmit the first sub-light of two-way pulse respectively, and for realizing the two-way
The relative time delay of first sub-light pulse；
First direct current phase-modulator 204 is used for the first sub-light transmitted through one of two the first sub-light roads where it
Pulse carries out direct current phase-modulation according to quantum key distribution agreement；
Described two first reflection units 205 and 206 for respectively by from the first beam splitter 203 through described two articles the
The two-way the first sub-light pulse-echo that one sub- optic path is come returns the first beam splitter 203 to close beam by the first beam splitter 203
Output.
Since two the first reflection units 205 and 206 are polarized orthogonal rotary reflection device, for first via light pulse
In two-way the first sub-light pulse that beam splitting obtains per the first sub-light pulse all the way: road the first sub-light pulse is through described two the
Two orthogonal polarisation states of corresponding first reflection unit reflection the first sub-light of the road Shi Gai pulse in one reflection unit polarize just
Rotary reflection is handed over, so that each of road the first sub-light pulse is orthogonal partially after the reflection via corresponding first reflection unit
Polarization state is transformed into orthogonal to that polarization state.
The second phase decoder constitutes the second unequal arm Michelson's interferometer, in which:
Second beam splitter 210 is used to the second tunnel light pulse beam splitting be the pulse of the second sub-light of two-way；
Two second sub-light roads are used to transmit the second sub-light of two-way pulse respectively, and for realizing the two-way
The relative time delay of second sub-light pulse；
Second direct current phase-modulator 211 is used for the second sub-light transmitted through one of two the second sub-light roads where it
Pulse carries out direct current phase-modulation according to quantum key distribution agreement；
Described two second reflection units 212 and 213 for respectively by from the second beam splitter 210 through described two articles the
The two-way the second sub-light pulse-echo that two sub- optic paths are come returns the second beam splitter 210 to close beam by the second beam splitter 210
Output.
Since two the second reflection units 212 and 213 are polarized orthogonal rotary reflection device, for the second tunnel light pulse
In two-way the second sub-light pulse that beam splitting obtains per the second sub-light pulse all the way: road the second sub-light pulse is through described two the
Two orthogonal polarisation states of corresponding second reflection unit reflection the second sub-light of the road Shi Gai pulse in two reflection units polarize just
Rotary reflection is handed over, so that each of road the second sub-light pulse is orthogonal partially after the reflection via corresponding second reflection unit
Polarization state is transformed into orthogonal to that polarization state.
For each of the first and second phase decoders phase decoder, can optionally there be following setting:
A) in phase decoder, two reflection units are the orthogonal rotary reflection device of circular polarization, such as two reflection units
It respectively include reflecting mirror；Beam splitter is round polarization-maintaining beam splitter.
B) in phase decoder, two reflection units are the orthogonal rotary reflection device of linear polarization, such as two reflection units
It include respectively reflecting mirror and quarter-wave plate, the reflecting mirror is in the quarter-wave plate rear end and the quarter-wave plate
Be integrally formed, wherein the polarization direction of one of respective two orthogonal polarisation states of the two-way sub-light pulse with described four/
The fast axle of one wave plate or the angle of slow axis are 45 degree；Beam splitter is line polarization-maintaining beam splitter.
C) in phase decoder, two reflection units are the orthogonal rotary reflection device of elliptical polarization；Beam splitter is oval guarantor
Inclined beam splitter.In such a case, it is possible to select suitable reflection unit according to specific oval polarization-maintaining beam splitter.
D) in phase decoder, two reflection units respectively include 90 degree of rotation faraday's reflecting mirrors；Beam splitter is polarization-maintaining point
Beam device or non-polarization-maintaining beam splitter.
Using setting a), b) or c), advantageously, in phase decoder, the two-way that is obtained for beam splitting
Each way light pulse in sub-light pulse: keep two orthogonal polarisation states of the way light pulse in beam splitter beam splitting to corresponding
Reflection unit remains unchanged during reflecting, and reflexes to during the beam splitter closes beam and kept not in the corresponding reflection unit
Become.This for example can keep optical path and by the light device in the two strips optical path by configuring polarization for the two strips optical path
Part is configured to polarization and optical device and/or non-birefringent optical device is kept to realize.
Each of first and second unequal arm Michelson's interferometers can be polarization-maintaining unequal arm Michelson's interferometer
Or non-polarization-maintaining unequal arm Michelson's interferometer, depend on concrete configuration.
Although all having direct current phase-modulator Fig. 2 shows first phase decoder and second phase decoder, first
It is possible that only one in phase decoder and second phase decoder, which has direct current phase-modulator,.In any case,
Available direct current phase-modulator causes in a phase decoder in first phase decoder and second phase decoder
Made direct current phase-modulation is relative to another phase decoder in first phase decoder and second phase decoder
In made direct current phase-modulation can differ 90 degree.
First direct current phase-modulator 204 and the second direct current phase-modulator 211 can be using the unrelated phase-modulations of polarization
Device perhaps polarizes dependent phase modulator such as polarization maintaining optical fibre stretcher or birefringent 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, the direct current phase-modulation to light pulse can be realized by a variety of specific meanss.For example, these
Means can include: modulation free space optical path length perhaps the length of modulation optical fiber or utilize serial or parallel connection optical waveguide
Phase-modulator etc..For example, desired direct current phase-modulation can be realized by changing the length of free space optical path with motor.
For another example, phase-modulation can be achieved in by the fiber stretcher using piezoelectric effect come the length of modulation optical fiber.In addition, phase
Position modulator can be suitable for voltage-controlled other types, by applying suitable DC voltage to polarizing unrelated phase-modulation
Device to carry out identical phase-modulation, it can be achieved that desired direct current phase-modulation to two orthogonal polarisation states of light pulse.Straight
In the case where flowing phase-modulation, without converting the voltage for being applied to phase-modulator.
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.
As shown in Figure 2, the first phase decoder can also include the first optical circulator 202.First ring of light shape
Device 202 is located at 203 front end of the first beam splitter.In the case, one of the input port of the first beam splitter 203 and output port
For same port.First via light pulse from preposition beam splitter 201 can from the first port A of optical circulator 202 input and from
The second port B of optical circulator 202 is exported to the first beam splitter 203, and the conjunction beam output from the first beam splitter 203 can be input to
The second port B of optical circulator 202 is simultaneously exported from the third port C of optical circulator 202.
As shown in Figure 2, the second phase decoder can also include the second optical circulator 209.Second ring of light shape
Device 209 is located at 210 front end of the second beam splitter.In the case, one of the input port of the second beam splitter 210 and output port
For same port.The second tunnel light pulse from preposition beam splitter 201 can from the first port A of optical circulator 209 input and from
The second port B of optical circulator 209 is exported to the second beam splitter 210, and the conjunction beam output from the second beam splitter 210 can be input to
The second port B of optical circulator 209 is simultaneously exported from the third port C of optical circulator 209.
A kind of HVDC Modulation quantum key based on polarized orthogonal rotary reflection of one preferred embodiment of the utility model point
Phase decoding device is sent out as shown in figure 3, including consisting of part: preposition beam splitter 303, optical circulator 304 and 311, polarization-maintaining
Beam splitter 305 and 312, direct current phase-modulator 306 and 313 and reflecting mirror 307,308,314 and 315.Polarization-maintaining beam splitter
305 and 312 be circle polarization-maintaining optical fiber beam splitter.
Input port of one of two ports 301 and 302 of preposition 303 side of beam splitter as device.Polarization-maintaining beam splitter
305 and reflecting mirror 307,308 form the first polarization-maintaining unequal arm Michelson's interferometer, two strip optical paths therebetween are polarization maintaining optical fibre
Optical path.Direct current phase-modulator 306 is inserted into any arm in the two-arm of the first polarization-maintaining unequal arm Michelson's interferometer.Ring of light shape
The first port A and second port B of device 304 are separately connected an output port and polarization-maintaining beam splitter for preposition beam splitter 303
305 input port.It inputs after the light pulse decoding of the first polarization-maintaining unequal arm Michelson's interferometer by polarization-maintaining beam splitter
305 output port 309 output, or another output port through polarization-maintaining beam splitter 305 are transmitted to optical circulator 304
Port B is simultaneously exported from the third port C of optical circulator 304.Polarization-maintaining beam splitter 312 and reflecting mirror 314,315 form the second polarization-maintaining
Unequal arm Michelson's interferometer, two strip optical paths therebetween are polarization maintaining optical fibre optical path.The insertion of direct current phase-modulator 313 second
Any arm in the two-arm of polarization-maintaining unequal arm Michelson's interferometer.The first port A and second port B of optical circulator 311 points
The another output mouth of preposition beam splitter 303 and an input port of polarization-maintaining beam splitter 312 are not connected.Input the second polarization-maintaining
It is exported after the light pulse decoding of unequal arm Michelson's interferometer by an output port 316 of polarization-maintaining beam splitter 312, or warp
Another output port of polarization-maintaining beam splitter 312 is transmitted to the port B of optical circulator 311 and from the third port of optical circulator 311
C output.
When work, port 301 or 302 of the light pulse through beam splitter 303 is into beam splitter 303 and by 303 beam splitting of beam splitter
For first via light pulse and the second tunnel light pulse.First via light pulse inputs and through the port A of optical circulator 304 by ring of light shape
The port B of device 304 is exported to polarization-maintaining beam splitter 305.The first via light pulse beam splitting of input is two-way the by polarization-maintaining beam splitter 305
One sub-light pulse.The first sub-light pulse is reflected back after direct current phase-modulator 306 carries out phase-modulation by reflecting mirror 307 all the way
Come, the pulse of the first sub-light of another way is directly transmitted to reflecting mirror 308 through polarization maintaining optical fibre and is reflected by reflecting mirror 308.Through phase
Reflected two-way the first sub-light pulse of delay is exported after polarization-maintaining beam splitter 305 closes beam by port 309, or by
It exports to the port B of optical circulator 304 and is transmitted to port C and is exported by port 310.Second tunnel light pulse is through optical circulator 311
Port A input and exported by the port B of optical circulator 311 to polarization-maintaining beam splitter 312.Polarization-maintaining beam splitter 312 is by the of input
Two tunnel light pulse beam splitting are the pulse of the second sub-light of two-way.The second sub-light pulse carries out phase through direct current phase-modulator 313 all the way
Reflected after modulation by reflecting mirror 314, the pulse of the second sub-light of another way directly through polarization maintaining optical fibre be transmitted to reflecting mirror 315 and by
Reflecting mirror 315 reflects.Through reflected two-way the second sub-light pulse of relative time delay after polarization-maintaining beam splitter 312 closes beam
It is exported by port 316, or is output to the port B of optical circulator 311 and is transmitted to port C and exported by port 317.Direct current phase
Position modulator 306 and 313 leads to the first polarization-maintaining unequal arm Michelson's interferometer and the second polarization-maintaining unequal arm Michelson interference
A made direct current phase-modulation in instrument differs 90 degree relative to direct current phase-modulation made by another.
A kind of HVDC Modulation quantum key based on polarized orthogonal rotary reflection of another preferred embodiment of the utility model
Distribute phase decoding device as shown in figure 4, including consisting of part: preposition beam splitter 403, is protected optical circulator 404 and 411
407,408,414 and of inclined beam splitter 405 and 412, direct current phase-modulator 406 and 413 and quarter-wave plate reflecting mirror
415.It is real that quarter-wave plate reflecting mirror 407,408,414 and 415 can plate reflecting mirror for quarter-wave plate plane of crystal
It is existing, 90 degree of phase phase difference of polarization maintaining optical fibre end face plating reflecting mirror can be also transmitted by fast and slow axis to be realized.It is reflected with quarter-wave plate
The fast axle or slow axis for the polarization maintaining optical fibre that mirror 407,408,414 and 415 connects are with the fast axle of corresponding quarter-wave plate or slowly
The angle of axis is 45 degree.Polarization-maintaining beam splitter 405 and 412 is line polarization-maintaining optical fiber beam splitter.
Input port of one of two ports 401 and 402 of preposition 403 side of beam splitter as device；Polarization-maintaining beam splitter
405 and quarter-wave plate reflecting mirror 407,408 form the first polarization-maintaining unequal arm Michelson's interferometer, two sub-lights therebetween
Road is polarization maintaining optical fibre optical path.Direct current phase-modulator 406 is inserted into the two-arm of the first polarization-maintaining unequal arm Michelson's interferometer
Any arm.The first port A and second port B of optical circulator 404 are separately connected an output port of preposition beam splitter 403
With an input port of polarization-maintaining beam splitter 405.After inputting the light pulse decoding of the first polarization-maintaining unequal arm Michelson's interferometer
It is exported by an output port 409 of polarization-maintaining beam splitter 405, or another output port through polarization-maintaining beam splitter 405 is transmitted to light
The port B of circulator 404 is simultaneously exported from the third port C of optical circulator 404.Polarization-maintaining beam splitter 412 and quarter-wave plate are anti-
It penetrates mirror 414,415 and forms the second polarization-maintaining unequal arm Michelson's interferometer, two strip optical paths therebetween are polarization maintaining optical fibre optical path.Directly
Flow any arm that phase-modulator 413 is inserted into the two-arm of the second polarization-maintaining unequal arm Michelson's interferometer.Optical circulator 411
First port A and second port B be separately connected preposition beam splitter 403 another output mouth and polarization-maintaining beam splitter 412 one
A input port.It inputs after the light pulse decoding of the second polarization-maintaining unequal arm Michelson's interferometer by the one of polarization-maintaining beam splitter 412
A output port 416 exports, or another output port through polarization-maintaining beam splitter 412 be transmitted to optical circulator 411 port B and from
The third port C of optical circulator 411 is exported.
When work, port 401 or 402 of the light pulse through beam splitter 403 is into beam splitter 403 and by 403 beam splitting of beam splitter
For first via light pulse and the second tunnel light pulse.First via light pulse inputs and through the port A of optical circulator 404 by ring of light shape
The port B of device 404 is exported to polarization-maintaining beam splitter 405.The first via light pulse beam splitting of input is two-way the by polarization-maintaining beam splitter 405
One sub-light pulse.The first sub-light pulse is anti-by quarter-wave plate after direct current phase-modulator 406 carries out phase-modulation all the way
It penetrates mirror 407 to reflect, another way the first sub-light pulse is directly transmitted to quarter-wave plate reflecting mirror 408 simultaneously through polarization maintaining optical fibre
It is reflected by quarter-wave plate reflecting mirror 408.Reflected two-way the first sub-light pulse through relative time delay is through polarization-maintaining
Beam splitter 405 is exported after closing beam by port 409, or is output to the port B of optical circulator 404 and is transmitted to optical circulator
404 third port C is exported by port 410.Second tunnel light pulse inputs and through the port A of optical circulator 411 by optical circulator
411 port B is exported to polarization-maintaining beam splitter 412.Second tunnel light pulse beam splitting of input is two-way the by polarization-maintaining beam splitter 412
Two sub-light pulses.The second sub-light pulse is anti-by quarter-wave plate after direct current phase-modulator 413 carries out phase-modulation all the way
It penetrates mirror 414 to reflect, another way the second sub-light pulse is directly transmitted to quarter-wave plate reflecting mirror 415 simultaneously through polarization maintaining optical fibre
It is reflected by quarter-wave plate reflecting mirror 415.Reflected two-way the second sub-light pulse through relative time delay is through polarization-maintaining
Beam splitter 412 is exported after closing beam by port 416, or is output to the port B of optical circulator 411 and is transmitted to optical circulator
411 port C is exported by port 417.Direct current phase-modulator 406 and 413 leads to the first polarization-maintaining unequal arm Michelson interference
A made direct current phase-modulation in instrument and the second polarization-maintaining unequal arm Michelson's interferometer is relative to made by another
Direct current phase-modulation differs 90 degree.
A kind of HVDC Modulation quantum key based on polarized orthogonal rotary reflection of another preferred embodiment of the utility model
Distribute phase decoding device as shown in figure 5, including consisting of part: preposition beam splitter 503, is protected optical circulator 504 and 511
Inclined beam splitter 505 and 512, direct current phase-modulator 506 and 513 and 90 degree rotate 507,508,514 and of faraday's reflecting mirror
515。
Input port of one of two ports 501 and 502 of preposition 503 side of beam splitter as device.Polarization-maintaining beam splitter
505 and 90 degree of rotation faraday reflecting mirrors 507,508 form the first polarization-maintaining unequal arm Michelson's interferometer, two strips therebetween
Optical path is polarization maintaining optical fibre optical path.Direct current phase-modulator 506 is inserted into the two-arm of the first polarization-maintaining unequal arm Michelson's interferometer
Any arm.The first port A and second port B of optical circulator 504 are separately connected an output port of preposition beam splitter 503
With an input port of polarization-maintaining beam splitter 505.After inputting the light pulse decoding of the first polarization-maintaining unequal arm Michelson's interferometer
It is exported by an output port 509 of polarization-maintaining beam splitter 505, or another output port through polarization-maintaining beam splitter 505 is transmitted to light
The port B of circulator 504 is simultaneously exported from the third port C of optical circulator 504.Polarization-maintaining beam splitter 512 and 90 degree rotates faraday
Reflecting mirror 514,515 forms the second polarization-maintaining unequal arm Michelson's interferometer, and two strip optical paths therebetween are polarization maintaining optical fibre optical path.
Direct current phase-modulator 513 is inserted into any arm in the two-arm of the second polarization-maintaining unequal arm Michelson's interferometer.Optical circulator 511
First port A and second port B be separately connected the another output mouth and polarization-maintaining beam splitter 512 of preposition beam splitter 503
One input port.It inputs after the light pulse decoding of the second polarization-maintaining unequal arm Michelson's interferometer by polarization-maintaining beam splitter 512
One output port 516 exports, or another output port through polarization-maintaining beam splitter 512 is transmitted to the port B of optical circulator 511 simultaneously
It is exported from the third port C of optical circulator 511.
When work, port 501 or 502 of the light pulse through beam splitter 503 is into beam splitter 503 and by 503 beam splitting of beam splitter
For first via light pulse and the second tunnel light pulse.First via light pulse inputs and through the port A of optical circulator 504 by ring of light shape
The port B of device 504 is exported to polarization-maintaining beam splitter 505.The first via light pulse beam splitting of input is two-way the by polarization-maintaining beam splitter 505
One sub-light pulse.The first sub-light pulse is after direct current phase-modulator 506 carries out phase-modulation by 90 degree of rotation faraday all the way
Reflecting mirror 507 reflects, and the pulse of the first sub-light of another way is directly transmitted to 90 degree of rotation faraday's reflecting mirrors through polarization maintaining optical fibre
It 508 and is reflected by 90 degree of rotation faraday reflecting mirrors 508.Reflected two-way the first sub-light arteries and veins through relative time delay
Punching is exported after polarization-maintaining beam splitter 505 closes beam by port 509, or is output to the port B of optical circulator 504 and is transmitted to light
The port C of circulator 504 is exported by port 510.Second tunnel light pulse inputs and through the port A of optical circulator 511 by ring of light shape
The port B of device 511 is exported to polarization-maintaining beam splitter 512.Second tunnel light pulse beam splitting of input is two-way the by polarization-maintaining beam splitter 512
Two sub-light pulses.The second sub-light pulse is after direct current phase-modulator 513 carries out phase-modulation by 90 degree of rotation faraday all the way
Reflecting mirror 514 reflects, and the pulse of the second sub-light of another way is directly transmitted to 90 degree of rotation faraday's reflecting mirrors through polarization maintaining optical fibre
It 515 and is reflected by 90 degree of rotation faraday reflecting mirrors 515.Reflected two-way the second sub-light pulse through relative time delay
It is exported after polarization-maintaining beam splitter 512 closes beam by port 516, or is output to the port B of optical circulator 511 and is transmitted to the ring of light
The port C of shape device 511 is exported by port 517.Direct current phase-modulator 506 and 513 leads to the first polarization-maintaining unequal arm Michelson
A made phase-modulation in interferometer and the second polarization-maintaining unequal arm Michelson's interferometer is relative to made by another
Phase-modulation differs 90 degree.
Although above in conjunction with polarization-maintaining beam splitter 505 and 512 and respective two polarization maintaining optical fibre sub-lights road is used
Situation is described, but for the phase decoding device of Fig. 5,505 He of polarization-maintaining beam splitter can be replaced with non-polarization-maintaining coupler
512, and/or respective two polarization maintaining optical fibre sub-lights road is replaced with two non PM fiber optical paths.
For the phase decoding device of Fig. 3 to Fig. 5, optical circulator is optional；Preposition beam splitter and first and second is not
It does not include optical circulator between one of equiarm Michelson's interferometer or both is possible.Preposition beam splitter and it is any not
In the case where not having optical circulator between equiarm Michelson's interferometer, the corresponding light pulse that preposition beam splitter obtains beam splitting is straight
Output is connect to the unequal arm Michelson's interferometer.
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
HVDC Modulation quantum key distribution phase decoding device is used for phase decoding.Alternatively, it is also possible in quantum key distribution system
Transmitting terminal configures the HVDC Modulation quantum key distribution phase decoding device based on polarized orthogonal rotary reflection of the utility model,
For 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 (12)
1. a kind of HVDC Modulation quantum key distribution phase decoding device based on polarized orthogonal rotary reflection, for any inclined
The input optical pulse all the way of polarization state carries out HVDC Modulation phase decoding, which is characterized in that the phase decoding device 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；
With the first phase decoder of an output port optical coupling in described two output ports of the preposition beam splitter,
The first phase decoder includes the first beam splitter, two the first reflection units and merges with the first beam splitter optocoupler
Respectively with two the first sub-light roads of described two first reflection unit optical couplings, first beam splitter is through described two first
Sub-light road is coupled to described two first reflection units, wherein described two first reflection units are polarized orthogonal rotary reflection dress
It sets；
It is decoded with the second phase of the another output mouth optical coupling in described two output ports of the preposition beam splitter
Device, the second phase decoder include the second beam splitter, two the second reflection units and with the second beam splitter optocoupler
Merge respectively with two the second sub-light roads of described two second reflection unit optical couplings, second beam splitter is through described two
Second sub-light road is coupled to described two second reflection units, wherein described two second reflection units are that polarized orthogonal rotation is anti-
Injection device,
Wherein the first phase decoder has the direct current phase tune being located at least one of described two first sub-light roads
Device processed and/or the second phase decoder have the direct current phase being located at least one of described two second sub-light roads
Modulator.
2. the HVDC Modulation quantum key distribution phase decoding dress according to claim 1 based on polarized orthogonal rotary reflection
It sets, which is characterized in that
Described two first reflection units are the orthogonal rotary reflection device of circular polarization；And/or
Described two second reflection units are the orthogonal rotary reflection device of circular polarization.
3. the HVDC Modulation quantum key distribution phase decoding dress according to claim 2 based on polarized orthogonal rotary reflection
It sets, which is characterized in that
Described two first reflection units respectively include reflecting mirror；And/or
Described two second reflection units respectively include reflecting mirror.
4. the HVDC Modulation quantum key according to any one of claim 1 to 3 based on polarized orthogonal rotary reflection point
Send out phase decoding device, which is characterized in that
First beam splitter is round polarization-maintaining beam splitter；And/or
Second beam splitter is round polarization-maintaining beam splitter.
5. the HVDC Modulation quantum key distribution phase decoding dress according to claim 1 based on polarized orthogonal rotary reflection
It sets, which is characterized in that
Described two first reflection units are the orthogonal rotary reflection device of linear polarization；And/or
Described two second reflection units are the orthogonal rotary reflection device of linear polarization.
6. the HVDC Modulation quantum key distribution phase decoding dress according to claim 5 based on polarized orthogonal rotary reflection
It sets, which is characterized in that
Described two first reflection units respectively include the first reflecting mirror and the first quarter-wave plate, and first reflecting mirror is in institute
It states the first quarter-wave plate rear end to be integrally formed with first quarter-wave plate, wherein first quarter-wave
Piece is configured so that one of respective two orthogonal polarisation states of two-way sub-light pulse through two first sub- optic paths
The angle of the fast axle or slow axis of polarization direction and first quarter-wave plate is 45 degree；And/or
Described two second reflection units respectively include the second reflecting mirror and the second quarter-wave plate, and second reflecting mirror is in institute
It states the second quarter-wave plate rear end to be integrally formed with second quarter-wave plate, wherein second quarter-wave
Piece is configured so that one of respective two orthogonal polarisation states of two-way sub-light pulse through two second sub- optic paths
The angle of the fast axle or slow axis of polarization direction and second quarter-wave plate is 45 degree.
7. the HVDC Modulation quantum key distribution phase described according to claim 1 or 5 or 6 based on polarized orthogonal rotary reflection
Decoding apparatus, which is characterized in that
First beam splitter is line polarization-maintaining beam splitter；And/or
Second beam splitter is line polarization-maintaining beam splitter.
8. the HVDC Modulation quantum key distribution phase decoding dress according to claim 1 based on polarized orthogonal rotary reflection
It sets, which is characterized in that
Described two first reflection units are the orthogonal rotary reflection device of elliptical polarization；And/or
Described two second reflection units are the orthogonal rotary reflection device of elliptical polarization.
9. the HVDC Modulation quantum key distribution 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；And/or
Second beam splitter is oval polarization-maintaining beam splitter.
10. according to claim 1 to described in any one of 3,5,6 and 8 based on the HVDC Modulation amount of polarized orthogonal rotary reflection
Quantum key distribution phase decoding device, which is characterized in that
Two first sub-light roads are that polarization keeps optical path, and the optical device of two first sub-light roads is that polarization keeps light
Device and/or non-birefringent optical device；And/or
Two second sub-light roads are that polarization keeps optical path, and the optical device of two second sub-light roads is that polarization keeps light
Device and/or non-birefringent optical device.
11. the HVDC Modulation quantum key distribution phase decoding according to claim 1 based on polarized orthogonal rotary reflection
Device, which is characterized in that
Described two first 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；And/or
Described two second reflection units respectively include 90 degree of rotation faraday's reflecting mirrors, and second beam splitter is polarization-maintaining beam splitter
Or non-polarization-maintaining beam splitter.
12. a kind of quantum key distribution system, which is characterized in that the quantum key distribution system includes:
Based on the HVDC Modulation quantum key distribution of polarized orthogonal rotary reflection described according to claim 1~any one of 11
The receiving end of the quantum key distribution system is arranged in phase decoding device, is used for phase decoding；And/or
Based on the HVDC Modulation quantum key distribution of polarized orthogonal rotary reflection described according to claim 1~any one of 11
The transmitting terminal of the quantum key distribution system is arranged in phase decoding device, is used for phase code.
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