CN209233846U - Differ the quantum key distribution time bit-phase decoding device and corresponding system of control - Google Patents
Differ the quantum key distribution time bit-phase decoding device and corresponding system of control Download PDFInfo
- Publication number
- CN209233846U CN209233846U CN201821752692.5U CN201821752692U CN209233846U CN 209233846 U CN209233846 U CN 209233846U CN 201821752692 U CN201821752692 U CN 201821752692U CN 209233846 U CN209233846 U CN 209233846U
- Authority
- CN
- China
- Prior art keywords
- phase
- beam splitter
- optical
- polarization
- 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 Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
- Optical Communication System (AREA)
Abstract
The utility model proposes the quantum key distribution time bit-phase decoding devices and quantum key distribution system of a kind of difference control.The device includes: 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 two output ports of preposition beam splitter optical coupling, merge including beam splitter, bundling device and with beam splitter optocoupler and is configured so that the phase difference through two strip optic paths in each comfortable phase decoder of two orthogonal polarisation states of corresponding light pulse differs the integral multiple of 2 π with two strip optical paths of bundling device optical coupling, two of them sub-light road and optical device thereon.The device also have positioned at preposition beam splitter front end or positioned at the beam splitter front end of phase decoder or in two strip optical paths it is any on phase-modulator.Using the utility model, it is able to achieve the immune time bit-phase code quantum key distribution solution of environmental disturbances.
Description
Technical field
The utility model relates to optical transport private communication technology field more particularly to a kind of quantum keys point of difference control
Send out 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.
Utility model content
The main purpose of the utility model is that proposing a kind of quantum key distribution time bit-phase of difference control
Coding/decoding method and device, because polarization lures when solving phase base decoding in time bit-phase code quantum key distribution application
It leads phase decoding caused by decline and interferes unstable problem.
The utility model provides at least following technical scheme:
1. a kind of quantum key distribution time bit-phase decoding device of difference control, for any inclined of incidence
The input optical pulse all the way of polarization state carries out time bit-phase decoding, which is characterized in that the decoding apparatus 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 first obtained by the input optical pulse beam splitting
Road light pulse and the second tunnel 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 includes the first beam splitter, the first bundling device and merges with the first beam splitter optocoupler and described first
Two strip optical paths of bundling device optical coupling, first beam splitter are coupled to first bundling device through the two strips optical path,
Wherein the two strips optical path and optical device thereon are configured so that two orthogonal polarisation states of the first via light pulse are each
The comfortable first beam splitter beam splitting to first bundling device closes the phase through the two strips optic path during beam
The integral multiple of 2 π of difference difference,
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 device of difference control according to scheme 1, feature exist
In,
The two strips optical path is free space optical path, and the optical device in the two strips optical path is non-birefringent optical device
And/or polarization keeps optical device；Or
The two strips optical path is polarization maintaining optical fibre optical path, and the optical device in the two strips optical path is non-birefringent optical device
And/or polarization keeps optical device.
3. quantum key distribution time bit-phase decoding device of difference control, special according to scheme 1 or 2
Sign is, the phase decoder further include:
The polarization maintaining optical fibre stretcher of any sub-light road in the two strips optical path；And/or
The birefringent phase modulator of any sub-light road in the two strips optical path.
4. quantum key distribution time bit-phase decoding device of difference control according to scheme 1, feature exist
In the phase-modulator is to polarize unrelated phase-modulator.
5. quantum key distribution time bit-phase decoding device of difference control according to scheme 1, feature exist
In the phase decoder uses the structure of unequal arm Mach-Zender interferometer or unequal arm Michelson's interferometer.
6. quantum key distribution time bit-phase decoding device of difference control according to scheme 1 or 2 or 5,
It is characterized in that,
The phase decoder uses the structure of unequal arm Mach-Zender interferometer, and the two strips optical path is polarization-maintaining
Optic fibre light path, wherein the difference of the polarization maintaining optical fibre length of the two strips optical path is the integral multiple of beat length of polarization maintaining optical fiber；And/or
The phase decoder uses the structure of unequal arm Michelson's interferometer, and the two strips optical path is polarization maintaining optical fibre
Optical path, wherein the difference of the polarization maintaining optical fibre length of the two strips optical path is the integral multiple of the half of beat length of polarization maintaining optical fiber.
7. quantum key distribution time bit-phase decoding device of difference control, special according to scheme 1 or 5
Sign is,
The phase decoder uses the structure of unequal arm Michelson's interferometer, first bundling device and described first
Beam splitter is same device, the phase decoder further include:
Two reflecting mirrors, described two reflecting mirrors are located in the two strips optical path, and being respectively used to will be from described
The two-way light pulse of first beam splitter come through the two strips optic path is reflected back first bundling device；With,
Optical circulator, the optical circulator are located at first beam splitter front end, the optical circulator have first port,
Second port and third port, for receiving the first via light pulse, the second port is optically coupled to the first port
First beam splitter, the third port are used to export,
Wherein the input port of the unequal arm Michelson's interferometer and output port are same port.
8. quantum key distribution time bit-phase decoding device of difference control according to scheme 1, feature exist
In first beam splitter and first bundling device are that polarization keeps optical device.
9. quantum key distribution time bit-phase decoding device of difference control according to scheme 1, feature exist
In the decoding apparatus further includes the second beam splitter, and second beam splitter is optically coupled to described the two of the preposition beam splitter
Another output mouth in a output port.
10. a kind of quantum key distribution system, which is characterized in that the quantum key distribution system includes:
Quantum key distribution time bit-phase decoding device of difference control according to any in scheme 1~9,
Its receiving end that the quantum key distribution system is arranged in is used for time bit-phase decoding；And/or
Quantum key distribution time bit-phase decoding device of difference control according to any in scheme 1~9,
Its transmitting terminal that the quantum key distribution system is arranged in is used for time bit-phase code.
Using the embodiment of the utility model, it can be achieved that multiple advantages.For example, close for time bit-phase code quantum
Key distribution application, the utility model are dry by each comfortable unequal arm of two orthogonal polarisation states of light pulse in control phase base decoding
The difference of the phase difference transmitted in the two-arm of interferometer realizes that the two orthogonal polarisation states effectively interfere output in output port simultaneously,
It is achieved in the immune phase base decoding function of environmental disturbances, makes it possible to realize the immune time ratio of stable environmental disturbances
Spy-phase code quantum key distribution solution.The quantum key distribution decoding scheme of the utility model can resist polarization to lure
Decline is led, while avoid the need for complicated correcting device.
Detailed description of the invention
Fig. 1 is quantum key distribution time bit-phase decoding of the difference control of one preferred embodiment of the utility model
The flow chart of method；
Fig. 2 is quantum key distribution time bit-phase decoding of the difference control of one preferred embodiment of the utility model
The composed structure schematic diagram of device；
Fig. 3 is quantum key distribution time bit-phase solution of the difference control of another preferred embodiment of the utility model
The composed structure schematic diagram of code device；
Fig. 4 is quantum key distribution time bit-phase solution of the difference control of another preferred embodiment of the utility model
The composed structure schematic diagram of code device；
Fig. 5 is quantum key distribution time bit-phase solution of the difference control of another preferred embodiment of the utility model
The composed structure schematic diagram of code device；
Fig. 6 is quantum key distribution time bit-phase solution of the difference control of another preferred embodiment of the utility model
The composed structure schematic diagram of code device；
Fig. 7 is quantum key distribution time bit-phase solution of the difference control of another preferred embodiment of the utility model
The composed structure schematic diagram of code device；
Fig. 8 is quantum key distribution time bit-phase solution of the difference control of another preferred embodiment of the utility model
The composed structure schematic diagram of code device.
Specific embodiment
Specifically describe the preferred embodiment of the utility model with reference to the accompanying drawing, wherein attached drawing constitutes the one of the application
Part, 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
When it may make the theme of the utility model smudgy, to the detailed tool of the known function and structure of device described herein
Body explanation will be omitted.
A kind of quantum key distribution time bit-phase decoding side of difference control of one preferred embodiment of the utility model
Method as shown in Figure 1, specifically includes 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.
Specifically, incident input optical pulse is random polarization state, it is can be linear polarization, circular polarization or oval
The complete polarized light of polarization 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 first via light pulse and to the second road 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 first via light pulse beam splitting can also equally regard as by with the road light pulse identical two
A orthogonal polarisation state composition.
According to a kind of possible embodiment, phase decoding is carried out to first via light pulse can include:
It is the pulse of two-way sub-light by first via light pulse beam splitting；And
The two-way sub-light pulse is transmitted in two strip optical paths respectively, and relative time delay is made into the two-way sub-light pulse
Beam output is closed afterwards,
Wherein through described two during each comfortable beam splitting to conjunction beam of two orthogonal polarisation states of control first via light pulse
The phase difference of strip optic path differs the integral multiple of 2 π.
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 to during closing beam in the two strips optical path in first via light pulse beam splitting
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.
Through corresponding two strip during each comfortable beam splitting to conjunction beam of two orthogonal polarisation states about light pulse all the way
The phase difference of optic path differs the integral multiple of 2 π, for example, it is assumed that the two orthogonal polarisation states are respectively x-polarisation state and y
X-polarisation state is shown as Δ x in beam splitting to the phase meter through two strip optic paths during closing beam, by y-polarisation by polarization state
State is shown as Δ y in beam splitting to the phase meter through two strip optic paths during closing beam, and two of the road Ze Gai light pulse are just
The integral multiple that the phase difference through two strip optic paths differs 2 π during handing over each comfortable beam splitting of polarization state extremely to close beam can be with table
It is shown as:
Δ x-Δ y=2 π .m,
Wherein m is integer, can be positive integer, negative integer or zero.
In a kind of possible embodiment, it is used for transmission the two of the two-way sub-light pulse that first via light pulse beam splitting obtains
Strip optical path includes that there are birefringent optical paths for two orthogonal polarisation states of the road light pulse, and/or in this two sub-lights
Road has two orthogonal polarisation states for the road light pulse, and there are birefringent optical devices.In this case, control should
Phase difference through the two strips optic path during each comfortable beam splitting to conjunction beam of two orthogonal polarisation states of road light pulse
The integral multiple for differing 2 π includes: during keeping each comfortable beam splitting to conjunction beam of the two orthogonal polarisation states respectively at described two
Polarization state is constant when sub-light road is transmitted；And adjustment is there are the length of birefringent optical path and/or there are birefringent smooth devices
The birefringent size of part, so that being passed during each comfortable beam splitting to conjunction beam of the two orthogonal polarisation states through the two strips optical path
Defeated phase difference differs the integral multiple of 2 π.Optionally, this can pass through following any realization: i) configure the two strips optical path
For polarization maintaining optical fibre optical path, non-birefringent optical device is configured by the optical device in the polarization maintaining optical fibre optical path and/or polarization is kept
Optical device；Ii free space optical path) is configured by the two strips optical path, configures the optical device in two optical paths to partially
Vibration keeps optical device.Herein, " polarization maintaining optical fibre optical path " refers to the optical path or polarization maintaining optical fibre using polarization maintaining optical fibre transmission light pulse
Connect the optical path formed." non-birefringent optical device ", which refers to, has different polarization states (for example, two orthogonal polarisation states)
The optical device of identical refractive index.In addition, polarization keeps optical device to be alternatively referred to as polarization-maintaining optical device.
In a kind of possible embodiment, free space optical path can be configured by above-mentioned two strips optical path, by described two
Optical device in optical path is configured to non-birefringent optical device.In this case, make each comfortable beam splitting of two orthogonal polarisation states
When transmitting in the two strips optical path, polarization state is remained unchanged to closing during beam, and the two orthogonal polarisation states are respectively
The phase difference through the two strips optic path can be identical during beam splitting to conjunction beam.
In a kind of possible realization, transmitted in the two-way sub-light pulse for being obtained to first via light pulse beam splitting
Two strip optical paths at least one sub-light road configuration polarization maintaining optical fibre stretcher and/or birefringent phase modulator.Polarization-maintaining
Fiber stretcher is suitable for adjusting the polarization maintaining optical fibre length of the optical path where it.Birefringent phase modulator is suitable for by its two
A orthogonal polarisation state applies different adjustable phase-modulations, thus can be provided to influence and adjust two of the road light pulse
The difference of phase difference through the two strips optic path during each comfortable beam splitting to conjunction beam of orthogonal polarisation state.For example, two-fold
The voltage of lithium columbate crystal can be applied to by controlling for lithium niobate phase modulator by penetrating phase-modulator, can be to passing through
The phase-modulation that two orthogonal polarisation states of the lithium niobate phase modulator are respectively subjected to is controlled and is adjusted.It is double as a result,
Refractive phase modulator can be used for influencing and adjusting each comfortable beam splitting of two orthogonal polarisation states of the road light pulse to the mistake of conjunction beam
The difference of the phase difference of two strip optic paths described in Cheng Zhongjing.
Carrying out phase-modulation to a light pulse can be realized by polarizing unrelated phase-modulator.Polarize unrelated phase-modulation
Device is suitable for carrying out identical phase-modulation to two orthogonal polarisation states of light pulse, so referred to as polarizing unrelated.Citing and
Speech, polarizing unrelated phase-modulator can be realized by two birefringent phase modulator serial or parallel connections.According to circumstances, Ke Yitong
A variety of specific meanss are crossed to realize phase-modulation.For example, these means can include: the length of modulation free space optical path, or
The length of modulation optical fiber, or utilize serial or parallel connection optical waveguide phase-modulator etc..For example, can be by being changed freely with motor
The length of space optical path realizes desired phase-modulation.For another example, it can be modulated by the fiber stretcher using piezoelectric effect
The length of optical fiber, is achieved in phase-modulation.In addition, phase-modulator can be suitable for voltage-controlled other types, pass through
Apply suitable voltage to polarizing unrelated phase-modulator to carry out identical phase tune to two orthogonal polarisation states of light pulse
System is, it can be achieved that desired phase-modulation.
In a preferred embodiment, phase-modulation packet is carried out according to quantum key distribution agreement to first via light pulse
It includes: randomly carrying out 0 degree of phase-modulation or 180 degree phase-modulation to first via light pulse.In a preferred embodiment, to
At least one of two-way sub-light pulse transmitted in the two strips optical path carries out phase-modulation according to quantum key distribution agreement
It include: that 0 degree of phase-modulation or 180 degree are randomly carried out to one of two-way sub-light pulse transmitted in the two strips optical path
Phase-modulation.Here, it randomly carries out 0 degree phase-modulation or 180 degree phase-modulation and refers to randomly to carry out being selected from 0 degree of phase tune
Phase-modulation in system and 180 degree phase-modulation the two.
According to a kind of possible embodiment, including: to second tunnel light pulse progress time bit decoding will be described
Second tunnel light pulse is directly exported for detecting；Or output after the second tunnel light pulse beam splitting is used to detect.
A kind of quantum key distribution time bit of difference control of one preferred embodiment of the utility model-phase decoding dress
It sets as shown in Fig. 2, including consisting of part: preposition beam splitter 201, beam splitter 202 and 203, phase-modulator 204, and
Bundling device 205.Beam splitter 203, bundling device 205 and two strip optical paths between them totally can be described as phase decoder.
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.
Beam splitter 203 will be for that will be the pulse of two-way sub-light from the first via light pulse beam splitting of preposition beam splitter 201, to divide
Beam output is not closed through two strip optic paths and by bundling device 205 after by this two strips optical path making relative time delay.Phase-modulator
204 for carrying out phase tune according to quantum key distribution agreement to the sub-light pulse transmitted through one of the two strip optical paths where it
System.Specifically, two strip optical paths are used to transmit this two-way sub-light pulse respectively, and for realizing the opposite of this two-way sub-light pulse
Delay.It can be realized by adjusting optical path physical length any in two strip optical paths between beam splitter 203 and bundling device 205
The relative time delay of two-way sub-light pulse.Beam is closed in this two-way sub-light pulse of bundling device 205 for that will come through two strip optic paths
Output.
Preferably, phase-modulator 204 is used to randomly carry out 0 degree of phase-modulation or 180 degree to by its light pulse
Phase-modulation.
According to the utility model, in phase decoder, two strip optical paths and optical device thereon are configured so that first
Phase difference difference 2 through two strip optic paths during each comfortable beam splitting to conjunction beam of two orthogonal polarisation states of road light pulse
The integral multiple of π.
In this regard, an optical path depends on for two orthogonal polarisation states there may be birefringent or there is no birefringent
In the type of the optical path.For example, free space optical path for input optical pulse all the way two orthogonal polarisation states there is no two-fold
Penetrate, and polarization maintaining optical fibre optical path for input optical pulse all the way two orthogonal polarisation states usually exist differ greatly each other it is two-fold
It penetrates.In addition, an optical device in optical path for two orthogonal polarisation states there may be birefringent or there is no birefringent, depend on
In the type of the optical device.For example, a non-birefringent optical device for input optical pulse all the way two orthogonal polarisation states not
There are birefringent, and a polarization keeps optical device usually to there are each other two orthogonal polarisation states of input optical pulse all the way
What is differed greatly is birefringent.
For phase decoder, can optionally there be following setting:
Two strip optical paths between beam splitter and bundling device in phase decoder are free space optical path, this two strip
Optical device in optical path, including phase-modulator --- it is that non-birefringent optical device and/or polarization keep light device if any
Part.For the setting, in the case where there is polarization to keep optical device, polarization keeps optical device itself to cause to be input to the phase solution
Two orthogonal polarisation states of the light pulse of code device differ 2 in beam splitting to phase difference during closing beam through two strip optic paths
The integral multiple of π.
Two strip optical paths between beam splitter and bundling device in phase decoder are polarization maintaining optical fibre optical path, this two strip
Optical device in optical path, including phase-modulator --- if any, optical device and/or non-birefringent smooth device are kept for polarization
Part.
Phase decoder further includes fiber stretcher and/or birefringent phase modulator.Fiber stretcher can be located at phase
Any sub-light road in two strip optical paths between the beam splitter and bundling device of position decoder, can be used for adjusting the son where it
The polarization maintaining optical fibre length of optical path.By adjusting polarization maintaining optical fibre length by means of fiber stretcher, it may be advantageous to be easily achieved input
Each comfortable beam splitting of two orthogonal polarisation states to the light pulse of the phase decoder is passed during beam through two strip optical paths to closing
Defeated phase difference differs the integral multiple of 2 π.In addition, fiber stretcher also is used as phase-modulator use.Birefringent phase modulation
Device can be located at any sub-light road in the two strips optical path, can be used for two orthogonal polarisation states to the light pulse by it
Apply different phase-modulations.By controlling the birefringent phase modulator, pass through two orthogonal polarisation states of its light pulse
The difference for the phase-modulation being respectively subjected to is adjustable.In this way, by utilizing birefringent phase modulator, it is convenient to influence and adjust
Through described two during each comfortable beam splitting to conjunction beam of two orthogonal polarisation states of the whole light pulse for being input to phase decoder
The difference of the phase difference of sub- optic path, it is easy to accomplish the integral multiple that the difference is 2 π.Before the birefringent phase modulator can be
Lithium niobate phase modulator described in text.
Phase decoder uses the structure of unequal arm Mach-Zender interferometer, and the optical path of interferometer two-arm is (that is, phase
Two strip optical paths between the beam splitter and bundling device of position decoder) use polarization maintaining optical fibre, the polarization maintaining optical fibre of this two strips optical path
The difference of length is the integral multiple of beat length of polarization maintaining optical fiber.In this case, the optical device in two strip optical paths causes to be input to the phase
Phase through two strip optic paths during each comfortable beam splitting to conjunction beam of two orthogonal polarisation states of the light pulse of position decoder
Potential difference differs the integral multiple of 2 π.
Phase decoder uses the structure of unequal arm Michelson's interferometer.At this point, the bundling device of phase decoder with
Beam splitter is same device.In the case, phase decoder further includes two reflecting mirrors, the two reflecting mirrors are located at use
In in two strip optical paths of the two-way sub-light pulse that the beam splitter beam splitting of transmission phase decoder obtains, it is respectively used to that phase will be come from
The two-way sub-light pulse-echo of the beam splitter of position decoder come through the two strips optic path is gone back so as to by phase decoding
Device closes beam output with beam splitter for the bundling device of same device.In addition, the input port of unequal arm Michelson's interferometer and
Output port can be same port, and phase decoder further includes optical circulator.The optical circulator can be located at phase decoding
The beam splitter front end of device.Corresponding light pulse all the way from preposition beam splitter 201 can input simultaneously from the first port of optical circulator
The bundling device to the beam splitter of phase decoder, from phase decoder is exported (with phase solution from the second port of optical circulator
The beam splitter of code device is same device) conjunctions beam export the second port that can be input to optical circulator and third from optical circulator
Port output.
Phase decoder uses structure --- the bundling device of phase decoder at this time of unequal arm Michelson's interferometer
It is same device with beam splitter.Interferometer two-arm optical path (that is, with for same device beam splitter and bundling device optical coupling,
It is respectively used to the two strip optical paths of two-way sub-light pulse that the beam splitter beam splitting of transmission phase decoder obtains) using polarization-maintaining light
Fibre, the difference of the polarization maintaining optical fibre length of this two strips optical path are the integral multiple of the half of beat length of polarization maintaining optical fiber.In this case, two
Other optical devices in sub-light road lead to each comfortable beam splitting of two orthogonal polarisation states of the light pulse for being input to the phase decoder
To the integral multiple for closing phase difference through two strip optic paths during beam and differing 2 π.
" beat length of polarization maintaining optical fiber " is concept well known in the art, refers to two polarization eigen states of polarization maintaining optical fibre along polarization maintaining optical fibre
Transmission generates polarization maintaining optical fibre length corresponding to the phase difference of 2 π.
Although Fig. 2 shows phase-modulator is arranged between beam splitter 203 and bundling device 205, i.e., in beam splitting to conjunction beam
One of two-way sub-light pulse obtained in the process to beam splitting carries out phase-modulation according to quantum key distribution agreement, it is also possible to
, phase-modulator is set in 203 front end of beam splitter, i.e., is assisted before first via light pulse beam splitting according to quantum key distribution
View carries out phase-modulation to it.Furthermore, it is also possible that phase-modulator is arranged before preposition beam splitter 201, i.e., to incidence
Input optical pulse all the way carry out phase-modulation.
In addition, in beam splitter 203 and being closed although showing phase decoder in Fig. 2 with only one phase-modulator
It is also possible that a phase-modulator, which is arranged, in every strip optical path in two strip optical paths between beam device 205.It is being arranged
There are two in the case where phase-modulator, the difference for the phase that two phase-modulators are modulated is true by quantum key distribution agreement
It is fixed.
For the embodiment of Fig. 2, beam splitter 203 and bundling device 205 preferably polarize and keep optical device.Polarization is mentioned to keep
Optical device, there are two orthogonal polarization eigen states, keep polarization state constant the light pulse of incident polarization eigen state, such as
It is well known by persons skilled in the art.
A kind of quantum key distribution time bit-phase solution of difference control of another preferred embodiment of the utility model
Code device is as shown in figure 3, phase decoder therein uses the structure of unequal arm Mach-Zender interferometer.The decoding apparatus
Including consisting of part: beam splitter 303 and 304, polarization-maintaining beam splitter 307, phase-modulator 308, polarization-maintaining bundling device 309.
Beam splitter 303 is used as preposition beam splitter, and one of two ports 301 and 302 of one side are as the defeated of decoding apparatus
Enter end.Polarization-maintaining beam splitter 307 and polarization-maintaining bundling device 309 constitute the component part of polarization-maintaining unequal arm Mach-Zender interferometer, protect
Two strip optical paths between inclined beam splitter 307 and polarization-maintaining bundling device 309 are (that is, the two of polarization-maintaining unequal arm Mach-Zender interferometer
Arm) it is polarization maintaining optical fibre optical path, phase-modulator 308 is inserted into appointing in two arms of polarization-maintaining unequal arm Mach-Zender interferometer
One arm.
When work, incident light pulse enters beam splitter 303 through the port 301 or 302 of preposition beam splitter 303, by beam splitter
303, which are divided into two-way light pulse, is transmitted.Light pulse all the way from preposition beam splitter 303 is input to beam splitter 304, and by dividing
Through port 305 or the output of port 306 for carrying out time bit decoding after 304 beam splitting of beam device.From the another of preposition beam splitter 303
Light pulse is input to polarization-maintaining beam splitter 307 all the way, and is the pulse of two-way sub-light respectively through protecting by 307 beam splitting of polarization-maintaining beam splitter
Two strip optic paths between inclined beam splitter 307 and polarization-maintaining bundling device 309.In this two-way sub-light pulse all the way through phase tune
It is transmitted to polarization-maintaining bundling device 309 after 308 Stochastic Modulation of device processed, 0 degree of phase or 180 degree phase, another way is directly passed through polarization maintaining optical fibre
Polarization-maintaining bundling device 309 is transported to, this two-way sub-light pulse closes beam and after closing beam by holding through polarization-maintaining bundling device 309 after relative time delay
Mouth 310 exports.The difference of two strip optical path polarization maintaining optical fibre length between polarization-maintaining beam splitter 307 and polarization-maintaining bundling device 309 is polarization-maintaining
Optical fiber claps long integral multiple.
A kind of quantum key distribution time bit of difference control of one preferred embodiment of the utility model-phase decoding dress
It sets as shown in figure 4, phase decoder therein uses the structure of unequal arm Mach-Zender interferometer.The decoding apparatus includes
Consisting of part: beam splitter 403 and 404, polarization-maintaining beam splitter 408, phase-modulator 407, polarization-maintaining bundling device 409.
Beam splitter 403 is used as preposition beam splitter, and one of two ports 401 and 402 of one side are as the defeated of decoding apparatus
Enter end.Polarization-maintaining beam splitter 408 and polarization-maintaining bundling device 409 constitute the component part of polarization-maintaining unequal arm Mach-Zender interferometer, protect
Two strip optical paths between inclined beam splitter 408 and polarization-maintaining bundling device 409 are (that is, the two of polarization-maintaining unequal arm Mach-Zender interferometer
Arm) it is polarization maintaining optical fibre optical path, phase-modulator 407 is located at before polarization-maintaining beam splitter 408.
When work, incident light pulse enters beam splitter 403 through the port 401 or 402 of preposition beam splitter 403, by beam splitter
403, which are divided into two-way light pulse, is transmitted.Light pulse all the way from preposition beam splitter 403 is input to beam splitter 404, and by dividing
Through port 405 or the output of port 406 for carrying out time bit decoding after 404 beam splitting of beam device.From the another of preposition beam splitter 403
It is input to polarization-maintaining beam splitter 408 after light pulse 0 degree of phase of phase modulated 407 Stochastic Modulation of device or 180 degree phase all the way, and
It is the pulse of two-way sub-light respectively through between polarization-maintaining beam splitter 408 and polarization-maintaining bundling device 409 by 408 beam splitting of polarization-maintaining beam splitter
Two strip optic paths.This two-way sub-light pulse is respectively through this two strips optic path to polarization-maintaining bundling device 409, this two way
Light pulse is closed beam through polarization-maintaining bundling device 409 after relative time delay and is exported after closing beam by port 410.Polarization-maintaining beam splitter 408 with
The difference of two strip optical path polarization maintaining optical fibre length between polarization-maintaining bundling device 409 is the integral multiple of beat length of polarization maintaining optical fiber.
A kind of quantum key distribution time bit-phase solution of difference control of another preferred embodiment of the utility model
Code device is as shown in figure 5, phase decoder therein uses the structure of unequal arm Mach-Zender interferometer.The decoding apparatus
Including consisting of part: beam splitter 503, polarization-maintaining beam splitter 505, phase-modulator 506, polarization-maintaining bundling device 507.
Beam splitter 503 is used as preposition beam splitter, and one of two ports 501 and 502 of one side are as the defeated of decoding apparatus
Enter end.Polarization-maintaining beam splitter 505 and polarization-maintaining bundling device 507 constitute the component part of polarization-maintaining unequal arm Mach-Zender interferometer, protect
Two strip optical paths between inclined beam splitter 505 and polarization-maintaining bundling device 507 are (that is, the two of polarization-maintaining unequal arm Mach-Zender interferometer
Arm) it is polarization maintaining optical fibre optical path, phase-modulator 506 is inserted into appointing in two arms of polarization-maintaining unequal arm Mach-Zender interferometer
One arm.
When work, incident light pulse enters beam splitter 503 through the port 501 or 502 of preposition beam splitter 503, by beam splitter
503, which are divided into two-way light pulse, is transmitted.One of this two-way light pulse is directly exported through port 504 by preposition beam splitter 503
For carrying out time bit decoding.Another way light pulse from preposition beam splitter 503 is input to polarization-maintaining beam splitter 505, and by
505 beam splitting of polarization-maintaining beam splitter is the pulse of two-way sub-light respectively through two between polarization-maintaining beam splitter 505 and polarization-maintaining bundling device 507
Sub- optic path.After 506 Stochastic Modulation of device phase modulated all the way, 0 degree of phase or 180 degree phase in this two-way sub-light pulse
It is transmitted to polarization-maintaining bundling device 507, another way is directly transmitted to polarization-maintaining bundling device 507 through polarization maintaining optical fibre, this two-way sub-light pulse exists
Beam is closed through polarization-maintaining bundling device 507 after relative time delay and is exported after closing beam by port 508.Polarization-maintaining beam splitter 505 and polarization-maintaining close beam
The difference of two strip optical path polarization maintaining optical fibre length between device 507 is the integral multiple of beat length of polarization maintaining optical fiber.
A kind of quantum key distribution time bit of difference control of one preferred embodiment of the utility model-phase decoding dress
It sets as shown in fig. 6, phase decoder therein uses the structure of unequal arm Michelson's interferometer.The decoding apparatus includes following
Component part: beam splitter 603 and 604, polarization-maintaining beam splitter 607, phase-modulator 609 and reflecting mirror 608 and 610.
Beam splitter 603 is used as preposition beam splitter, and one of two ports 601 and 602 of one side are as the defeated of decoding apparatus
Enter end.Polarization-maintaining beam splitter 607 and reflecting mirror 608,610 constitute the component part of polarization-maintaining unequal arm Michelson's interferometer, polarization-maintaining
Two strip optical paths (that is, two-arm of polarization-maintaining unequal arm Michelson's interferometer) between beam splitter 607 and reflecting mirror 608,610
Using polarization maintaining optical fibre optical path, phase-modulator 609 is inserted into any arm in the two-arm of polarization-maintaining unequal arm Michelson's interferometer.
When work, port 601 or 602 of the incident light pulse through beam splitter 603 is into beam splitter 603 and by beam splitter 603
Two-way light pulse is beamed into be transmitted.Light pulse all the way from preposition beam splitter 603 is input to beam splitter 604, and by dividing
Through port 605 or the output of port 606 for carrying out time bit decoding after 604 beam splitting of beam device.From the another of preposition beam splitter 603
Light pulse inputs polarization-maintaining beam splitter 607 all the way, is then the pulse of two-way sub-light respectively through protecting by 607 beam splitting of polarization-maintaining beam splitter
The two-arm transmission of inclined unequal arm Michelson's interferometer.It is directly transferred to reflecting mirror 608 all the way simultaneously in this two-way sub-light pulse
It is reflected, is transmitted to after another way 0 degree of phase of phase modulated 609 Stochastic Modulation of device or 180 degree phase anti-by reflecting mirror 608
It penetrates mirror 610 to be reflected by reflecting mirror 610 again, the reflected two-way sub-light pulse after relative time delay is through polarization-maintaining beam splitter
607 conjunction beams are simultaneously exported after closing beam by port 611.Two strip optical paths between polarization-maintaining beam splitter 607 and reflecting mirror 608,610 are protected
The difference of inclined fiber lengths is the integral multiple of beat length of polarization maintaining optical fiber half.
A kind of quantum key distribution time bit-phase solution of difference control of another preferred embodiment of the utility model
Code device is as shown in fig. 7, phase decoder therein uses the structure of unequal arm Michelson's interferometer.The decoding apparatus includes
Consisting of part: beam splitter 703 and 704, polarization-maintaining beam splitter 708, phase-modulator 707 and reflecting mirror 709 and 710.
Beam splitter 703 is used as preposition beam splitter, and one of two ports 701 and 702 of one side are as the defeated of decoding apparatus
Enter end.Polarization-maintaining beam splitter 708 and reflecting mirror 709,710 constitute the component part of polarization-maintaining unequal arm Michelson's interferometer, polarization-maintaining
Two strip optical paths (that is, two-arm of polarization-maintaining unequal arm Michelson's interferometer) between beam splitter 708 and reflecting mirror 709,710
Using polarization maintaining optical fibre optical path, phase-modulator 707 is located at before polarization-maintaining beam splitter 708.
When work, incident light pulse enters beam splitter 703 through the port 701 or 702 of preposition beam splitter 703, by beam splitter
703, which are divided into two-way light pulse, is transmitted.Light pulse all the way from preposition beam splitter 703 is input to beam splitter 704, and by dividing
Through port 705 or the output of port 706 for carrying out time bit decoding after 704 beam splitting of beam device.From the another of preposition beam splitter 703
It is input to polarization-maintaining beam splitter 708 after light pulse 0 degree of phase of phase modulated 707 Stochastic Modulation of device or 180 degree phase all the way, so
It is afterwards the pulse of two-way sub-light with the two-arm biography respectively through polarization-maintaining unequal arm Michelson's interferometer by 708 beam splitting of polarization-maintaining beam splitter
It is defeated.It is directly transferred to reflecting mirror 709 all the way and is reflected by reflecting mirror 709 in this two-way sub-light pulse, another way is direct
It is transmitted to reflecting mirror 710 to be reflected by reflecting mirror 710 again, the reflected two-way sub-light pulse after relative time delay is through protecting
Inclined beam splitter 708 closes beam and is exported after closing beam by port 711.Two between polarization-maintaining beam splitter 708 and reflecting mirror 709,710
The difference of sub-light road polarization maintaining optical fibre length is the integral multiple of beat length of polarization maintaining optical fiber half.
A kind of quantum key distribution time bit-phase solution of difference control of another preferred embodiment of the utility model
Code device is as shown in figure 8, phase decoder therein uses the structure of unequal arm Michelson's interferometer.The decoding apparatus includes
Consisting of part: beam splitter 803, polarization-maintaining beam splitter 805, phase-modulator 807 and reflecting mirror 806 and 808.
Beam splitter 803 is used as preposition beam splitter, and one of two ports 801 and 802 of one side are as the defeated of decoding apparatus
Enter end.Polarization-maintaining beam splitter 805 and reflecting mirror 806,808 constitute the component part of polarization-maintaining unequal arm Michelson's interferometer, polarization-maintaining
Two strip optical paths (that is, two-arm of polarization-maintaining unequal arm Michelson's interferometer) between beam splitter 805 and reflecting mirror 806,808
Using polarization maintaining optical fibre optical path, phase-modulator 807 is inserted into any arm in the two-arm of polarization-maintaining unequal arm Michelson's interferometer.
When work, port 801 or 802 of the incident light pulse through beam splitter 803 is into beam splitter 803 and by beam splitter 803
Two-way light pulse is beamed into be transmitted.One of this two-way light pulse is directly exported through port 804 by preposition beam splitter 803 and is used
In progress time bit decoding.Another way light pulse from preposition beam splitter 803 inputs polarization-maintaining beam splitter 805, then by protecting
Inclined 805 beam splitting of beam splitter is the pulse of two-way sub-light with the two-arm transmission respectively through polarization-maintaining unequal arm Michelson's interferometer.This two
It is directly transferred to reflecting mirror 806 all the way and is reflected by reflecting mirror 806 in way light pulse, the phase modulated device of another way
Reflecting mirror 808 is transmitted to after 807 0 degree of Stochastic Modulation phases or 180 degree phase to be reflected by reflecting mirror 808 again, is reflected
The two-way sub-light pulse after relative time delay close and beam and exported by port 809 after closing beam through polarization-maintaining beam splitter 805.Polarization-maintaining point
The difference of two strip optical path polarization maintaining optical fibre length between beam device 805 and reflecting mirror 806,808 is the whole of beat length of polarization maintaining optical fiber half
Several times.
For quantum key distribution time bit-phase decoding device of the difference control of the utility model, when therein
When phase decoder uses the structure of unequal arm Michelson's interferometer, optical circulator can be optionally used.For example, right
In the embodiment of Fig. 6 or Fig. 8, optical circulator can be set in the optical path between preposition beam splitter and polarization-maintaining beam splitter, so that
The above-mentioned another way light pulse from preposition beam splitter inputs from the first port of the optical circulator and from the of the optical circulator
Two-port netwerk is exported to polarization-maintaining beam splitter, and the conjunction beam output from polarization-maintaining beam splitter is input to the second port of the optical circulator simultaneously
It is exported from the third port of the optical circulator；In this case, the output port and input terminal of unequal arm Michelson's interferometer
Mouth can be same port, rather than the port 611 in Fig. 6 or the port in Fig. 8 809.It similarly, can for the embodiment of Fig. 7
Circulator is arranged between phase-modulator 707 and polarization-maintaining beam splitter 708, so that the light pulse from phase-modulator 707
It inputs from the first port of the optical circulator and exports from the second port of the optical circulator to polarization-maintaining beam splitter 708, Lai Zibao
The conjunctions beam of inclined beam splitter 708 exports the second port for being input to the optical circulator and defeated from the third port of the optical circulator
Out；In this case, the output port of unequal arm Michelson's interferometer and input port can be same port, rather than Fig. 7
In port 711.
Herein, term " beam splitter " and " bundling device " are used interchangeably, and beam splitter is also referred to as and as bundling device, instead
?.
The quantum key distribution that can be controlled in the difference that the receiving end of quantum key distribution system configures the utility model
Time bit-phase decoding device is used for time bit-phase decoding.Alternatively, it is also possible in the hair of quantum key distribution system
The quantum key distribution time bit-phase decoding device for penetrating the difference control of end configuration the utility model, is used for time bit-
Phase code.
In general, environmental disturbances cause communicating pair transmission fiber and the generation of encoding and decoding interferometer optical fiber birefringent, lead to light
Pulse polarization state when reaching receiving end changes at random, so that decoding interference has polarization induction decline, influence time bit-phase
The decoded stability of phase base in position decoding quantum key distribution.The utility model can be realized light pulse in the decoding of phase base
Two orthogonal polarisation states effectively interfere output in output port simultaneously, are equivalent to and carry out at polarization diversity to two orthogonal polarisation states
Reason can effectively solve interference decoding instability problem caused by polarization induction decline, realize the immune stable phase angle of environmental disturbances
In addition decoding also eliminates pair without using polarization beam apparatus and two interferometers to be decoded two polarization states respectively
The needs of correction.
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 (10)
1. a kind of quantum key distribution time bit-phase decoding device of difference control, for incident random polarization state
Input optical pulse all the way carry out time bit-phase decoding, which is characterized in that the decoding apparatus 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 first via light obtained by the input optical pulse beam splitting
Pulse and the second tunnel light pulse；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, the first bundling device and merges with the first beam splitter optocoupler and the first conjunction beam
Two strip optical paths of device optical coupling, first beam splitter are coupled to first bundling device through the two strips optical path, wherein
The two strips optical path and optical device thereon are configured so that two each leisures of orthogonal polarisation state of the first via light pulse
The first beam splitter beam splitting to first bundling device closes the phase difference phase through the two strips optic path during beam
The integral multiple of poor 2 π,
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 device of difference control according to claim 1, feature exist
In,
The two strips optical path is free space optical path, the optical device in the two strips optical path be non-birefringent optical device and/
Or polarization keeps optical device；Or
The two strips optical path is polarization maintaining optical fibre optical path, the optical device in the two strips optical path be non-birefringent optical device and/
Or polarization keeps optical device.
3. quantum key distribution time bit-phase decoding device of difference control according to claim 1 or 2, special
Sign is, the phase decoder further include:
The polarization maintaining optical fibre stretcher of any sub-light road in the two strips optical path；And/or
The birefringent phase modulator of any sub-light road in the two strips optical path.
4. quantum key distribution time bit-phase decoding device of difference control according to claim 1, feature exist
In the phase-modulator is to polarize unrelated phase-modulator.
5. quantum key distribution time bit-phase decoding device of difference control according to claim 1, feature exist
In the phase decoder uses the structure of unequal arm Mach-Zender interferometer or unequal arm Michelson's interferometer.
6. quantum key distribution time bit-phase decoding device of difference control described according to claim 1 or 2 or 5,
It is characterized in that,
The phase decoder uses the structure of unequal arm Mach-Zender interferometer, and the two strips optical path is polarization maintaining optical fibre
Optical path, wherein the difference of the polarization maintaining optical fibre length of the two strips optical path is the integral multiple of beat length of polarization maintaining optical fiber；And/or
The phase decoder uses the structure of unequal arm Michelson's interferometer, and the two strips optical path is polarization maintaining optical fibre light
Road, wherein the difference of the polarization maintaining optical fibre length of the two strips optical path is the integral multiple of the half of beat length of polarization maintaining optical fiber.
7. quantum key distribution time bit-phase decoding device of control is differed according to claim 1 or 5, it is special
Sign is,
The phase decoder uses the structure of unequal arm Michelson's interferometer, first bundling device and first beam splitting
Device is same device, the phase decoder further include:
Two reflecting mirrors, described two reflecting mirrors are located in the two strips optical path, and being respectively used to will be from described first
The two-way light pulse of beam splitter come through the two strips optic path is reflected back first bundling device；With,
Optical circulator, the optical circulator are located at first beam splitter front end, and the optical circulator has first port, second
Port and third port, the first port are optically coupled to described for receiving the first via light pulse, the second port
First beam splitter, the third port are used to export,
Wherein the input port of the unequal arm Michelson's interferometer and output port are same port.
8. quantum key distribution time bit-phase decoding device of difference control according to claim 1, feature exist
In first beam splitter and first bundling device are that polarization keeps optical device.
9. quantum key distribution time bit-phase decoding device of difference control according to claim 1, feature exist
In the decoding apparatus further includes the second beam splitter, and second beam splitter is optically coupled to described the two of the preposition beam splitter
Another output mouth in a output port.
10. a kind of quantum key distribution system, which is characterized in that the quantum key distribution system includes:
The quantum key distribution time bit of difference control described according to claim 1~any one of 9-phase decoding dress
It sets, the receiving end of the quantum key distribution system is set, be used for time bit-phase decoding；And/or
The quantum key distribution time bit of difference control described according to claim 1~any one of 9-phase decoding dress
It sets, the transmitting terminal of the quantum key distribution system is set, be used for time bit-phase code.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821752692.5U CN209233846U (en) | 2018-10-29 | 2018-10-29 | Differ the quantum key distribution time bit-phase decoding device and corresponding system of control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821752692.5U CN209233846U (en) | 2018-10-29 | 2018-10-29 | Differ the quantum key distribution time bit-phase decoding device and corresponding system of control |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209233846U true CN209233846U (en) | 2019-08-09 |
Family
ID=67500993
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821752692.5U Active CN209233846U (en) | 2018-10-29 | 2018-10-29 | Differ the quantum key distribution time bit-phase decoding device and corresponding system of control |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209233846U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110995359A (en) * | 2019-11-19 | 2020-04-10 | 武汉邮电科学研究院有限公司 | Phase modulation method and system based on digital DSP demodulation |
-
2018
- 2018-10-29 CN CN201821752692.5U patent/CN209233846U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110995359A (en) * | 2019-11-19 | 2020-04-10 | 武汉邮电科学研究院有限公司 | Phase modulation method and system based on digital DSP demodulation |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109150525A (en) | Quantum key distribution phase decoding method and apparatus and corresponding system | |
| CN208849779U (en) | A kind of phase decoding device and quantum key distribution 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 | |
| CN109039617A (en) | Quantum key distribution time bit-phase decoding method and apparatus and corresponding system | |
| CN109150524A (en) | A kind of phase decoding method, apparatus and quantum key distribution system | |
| CN109150522A (en) | Quantum key distribution time bit-phase decoding method and apparatus and corresponding system | |
| CN109039621A (en) | HVDC Modulation quantum key distribution phase decoding method and apparatus and corresponding system | |
| CN109104277A (en) | HVDC Modulation quantum key distribution phase decoding method and apparatus and corresponding system | |
| CN110460384A (en) | Quantum key distribution phase codec, corresponding coding and decoding device and system | |
| CN109039622A (en) | quantum key distribution time bit-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 | |
| CN109039618A (en) | Quantum key distribution phase decoding method and apparatus and corresponding system | |
| CN109120404A (en) | HVDC Modulation quantum key distribution phase decoding method, apparatus and system based on 90 degree of welding difference control | |
| CN109120401A (en) | HVDC Modulation quantum key distribution time bit-phase decoding methods, devices and systems of polarized orthogonal rotation | |
| CN109067531A (en) | Phase decoding method, apparatus and quantum key distribution system based on 90 degree of welding difference control | |
| CN208874580U (en) | HVDC Modulation quantum key distribution phase decoding device and corresponding system | |
| CN209233846U (en) | Differ the quantum key distribution time bit-phase decoding device and corresponding system of control | |
| CN109039620B (en) | Quantum key distribution time bit-phase decoding method and 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 | |
| CN209233847U (en) | Quantum key distribution time bit-phase decoding apparatus and system based on polarized orthogonal rotation | |
| CN209170393U (en) | HVDC Modulation quantum key distribution phase decoding device and quantum key distribution system based on polarized orthogonal rotation | |
| CN209218107U (en) | Quantum key distribution time bit-phase decoding device and corresponding system | |
| CN209151179U (en) | HVDC Modulation quantum key distribution phase decoding device and corresponding system based on 90 degree of welding difference control |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |