CN107196715A - A kind of quantum key dispatching system modulated based on interference ring single-phase and method - Google Patents
A kind of quantum key dispatching system modulated based on interference ring single-phase and method Download PDFInfo
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- CN107196715A CN107196715A CN201710629272.1A CN201710629272A CN107196715A CN 107196715 A CN107196715 A CN 107196715A CN 201710629272 A CN201710629272 A CN 201710629272A CN 107196715 A CN107196715 A CN 107196715A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/70—Photonic quantum communication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
- H04L9/0816—Key establishment, i.e. cryptographic processes or cryptographic protocols whereby a shared secret becomes available to two or more parties, for subsequent use
- H04L9/0852—Quantum cryptography
Abstract
A kind of quantum key dispatching system modulated based on interference ring single-phase and method, by increasing a polarization beam apparatus in receiving terminal, flashlight is decomposed into two vertical polarization states, the interference under respective polarization state is completed using polarization maintaining optical fibre interference ring, obtain preferable result of interference, without using deviation-rectifying system, production cost is reduced；One phase is adjusted by an interference ring, to there was only 10 minus six powers magnitudes of existing mode using the requirement of DAC and analogue amplifier, greatly reduce the requirement of system design, the present invention has also been abandoned inveigles optical signal the modulation of state etc. and the selection modulated to optical signal phase of being opened the light using light intensity modulator or light using light intensity modulator, further improves the formation efficiency of key.In addition, the present invention is using the interference ring that is made by planar optical waveguide, because planar optical waveguide has polarization insensitive, and the manufacture craft of waveguide is extremely ripe, can reach sub-micrometer scale, preferably improves the key of system into code check.
Description
Technical field
The present invention relates to optical transport safety communication technology field, more particularly to a kind of amount modulated based on interference ring single-phase
Sub-key distribution system and method.
Background technology
With a wide range of popularization of internet, the information transmission between the mankind has reached unprecedented quantity and frequency,
Various privacy informations expose on the internet more and more, and therefore, the mankind have also arrived unprecedented to the demand of secret communication
Height.The cipher mode of present internet information safety is referred to as " public-key cryptography " cryptosystem, and its principle is by encryption
The public-key cryptography propagated on algorithm, generation network, and the private key of computer-internal is stayed in, two keys must coordinate and make
With complete encryption and decryption processes could be realized.
The encryption standard that modern the Internet is used is the RSA Algorithm being born 1970s, i.e., using matter several greatly because
Son, which is decomposed, to be difficult to calculate to ensure the security of key.
Quantum-key distribution is that physicist Bennett in 1984 and cryptologist Brassard are proposed based on quantum force
The BB84 agreements of measuring principle are learned, quantum-key distribution can fundamentally ensure that the security of key.
Quantum key produces flashlight in transmitting terminal in the prior art, by traditional quantum channel transmitting procedure, by
In by the effect such as fiber channel birefringence, its polarization state is more big changes, and is influenceed the interference effect in optical signal later stage, can be made
The loss of integral key, at present, can increase deviation-rectifying system, by deviation-rectifying system come also to solve the above problems in receiving terminal
The polarization state of former optical signal, but deviation-rectifying system needs complicated hardware and software section composition, to whole encryption key distribution system
System brings the complexity of total system and improves production cost；In addition, optical signal passes through general single mode fiber interference ring
Long galianconism different paths after its polarization state can occur different changes and cause result of interference unobvious, so normal
Need to use extra polarization compensation technology identical come the polarization state for ensureing the light by dissimilar arm in making, further increase
System complexity and improve production cost.
The content of the invention
It is existing to solve present invention aims at a kind of quantum key dispatching system and method based on Waveguide interference ring is provided
There is quantum key distribution system in technology to need system to increase deviation-rectifying system and polarization compensation to improve key generation efficiency
Technology, so that system adds complexity and improves the technical bug of production cost.
The technical proposal of the invention is realized in this way：
A kind of quantum key dispatching system modulated based on interference ring single-phase, including the transmitting connected by quantum channel
End and receiving terminal, the transmitting terminal include transmitting terminal driving plate, eight road signal lasers, synchronous laser, eight road Waveguide interferences
Ring, the first adjustable attenuator, the second adjustable attenuator and transmitting terminal multiplexer, eight road signal laser are divided into two groups,
Per the tunnels of Zu Ge tetra-, one of which is signal state intensity, and another group is trick state intensity, described per the road Waveguide interference ring arm of Zu tetra-
Long difference is different, and its phase difference is respectively 0, pi/2, π, 3 pi/2s, and eight road signal laser is connected respectively eight tunnel waveguides and done
Ring is related to, the eight roads Waveguide interference ring is connected with the first adjustable attenuator, the first adjustable attenuator connection transmitting terminal is answered
With device, the synchronous laser is sequentially connected the second adjustable attenuator and transmitting terminal multiplexer, first adjustable attenuator
Be connected same one end of transmitting terminal multiplexer with the second adjustable attenuator, the transmitting terminal driving plate connect respectively signal laser,
Waveguide interference ring, synchronous laser, the first adjustable attenuator and the second adjustable attenuator；
The receiving terminal includes receiving terminal driving plate, receiving terminal multiplexer, synchroprobe, polarization beam apparatus, two-way ripple
Interference ring and single-photon detector are led, the receiving terminal multiplexer connects transmitting terminal multiplexer by quantum channel, described to connect
The other end of receiving end multiplexer connects synchroprobe and polarization beam apparatus respectively, and the polarization beam apparatus connects two respectively successively
Road Waveguide interference ring, wherein, two-way Waveguide interference ring is respectively connected with two-way single-photon detector, the receiving terminal driving plate difference
Connect synchroprobe, Waveguide interference ring and single-photon detector.
Preferably, the Waveguide interference ring includes front end coupler, long-armed Wave guide unit, galianconism Wave guide unit and rear end
Coupler, the output end of the front end coupler connects long-armed Wave guide unit and galianconism Wave guide unit, the long-armed ripple respectively
The output end for leading unit and galianconism Wave guide unit connects rear end coupler respectively, and the long-armed Wave guide unit includes the first coupling
Device, delay waveguide and the second coupler, first coupler connect the output end of front end coupler by silicon waveguide, described
First coupler connects the second coupler by the waveguide that is delayed, and second coupler connects rear end coupler by silicon waveguide
Input, the galianconism Wave guide unit connects the output end of front end coupler and the input of rear end coupler using silicon waveguide
Phase-modulator is provided with end, long-armed Wave guide unit and/or the galianconism Wave guide unit.
Preferably, the delay waveguide is the waveguide of low-loss silicon, silica waveguide, SiON waveguides, Si3N4Waveguide and poly-
Adjustable attenuator is provided with one kind or combination in compound waveguide, the galianconism Wave guide unit.
Preferably, the signal laser and synchronous laser are same multiplexed laser, and the multiplexed laser can be adopted
With time-multiplexed mode transmission signal light and synchronizable optical, the transmitting terminal multiplexer is adaptive multiplexer, and the receiving terminal is answered
It is solution adaptive multiplexer with device.
A kind of quantum key distribution method modulated based on interference ring single-phase, is comprised the following steps：
1) laser is triggered：Transmitting terminal triggers synchronous laser using a clock signal and launches synchronizable optical, described same
Light is walked as synchronous transmission of signal to receiving terminal as used in synchroprobe response is receiving terminal, meanwhile, the clock signal pair
Being triggered all the way in eight road signal lasers does not trigger generation flashlight, and the flashlight is used as modulation light；
2) state modulation is inveigled：The transmitting luminous power of eight road signal lasers is divided into two groups and each group is four tunnels, and one group is
Signal state intensity, another group is trick state intensity, and vacuum state is modulated using laser is not triggered；
3) transmitting terminal is interfered：Respective four road signal laser corresponds to what four route waveguide fabrications were completed respectively in two groups
Arm Waveguide interference ring, described different per the road Waveguide interference ring arm length differences of Zu tetra-, its phase difference is respectively 0, pi/2, π, 3 pi/2s, is led to
Crossing triggering, signal laser is luminous all the way or does not trigger progress light path selection, completes the selection of transmitting terminal out of phase modulation；
4) automatically controlled adjustable attenuator is decayed to flashlight：Depolarizer flashlight carry out it is depolarized, it is depolarized after flashlight
Light pulse is decayed into single photon magnitude by the first adjustable attenuator, synchronizable optical adjusts synchronizable optical by the second adjustable attenuator
Save the strength range that can be responded to receiving terminal；
5) flashlight and synchronizable optical throughput subchannel transmission：Flashlight passes through quantum with synchronizable optical after transmitting terminal is compound
Transmission is decomposed again to receiving terminal, and in receiving terminal, and flashlight enters polarization beam apparatus, and synchronizable optical passes through synchronous optical detection
Device is detected；
6) polarization beam apparatus beam splitting：The light of asynchronous polarization is decomposed into horizontal polarization direction by polarization beam apparatus and hung down
Straight polarization direction；
7) receiving terminal is interfered：The flashlight of horizontal polarization direction and vertical polarization is respectively connected to two brachiums of two-way
The different Waveguide interference ring of difference carries out phase-modulation, and phase difference is respectively 0, pi/2, completes the selection of receiving terminal out of phase；
8) single-photon detector is detected：Single-photon detector detects optical signals, and safe key is produced for subsequent treatment.
Preferably, the step 5) in, flashlight and synchronizable optical are combined in transmitting terminal can use wavelength-division multiplex or time-division
The mode of multiplexing is carried out, and decompose correspondence in receiving terminal is carried out using solution wavelength-division multiplex or solution time division multiplexing mode.
7th, quantum key distribution method as claimed in claim 6, it is characterised in that the step 5) if flashlight with it is same
When walking the mode of photoreactivation transmission using time division multiplexing, the signal laser can use any one laser with synchronous laser
Device timesharing sends flashlight and synchronizable optical.
Compared with prior art, the present invention has following beneficial effect：
(1) quantum key dispatching system modulated based on interference ring single-phase of the invention and method, by receiving terminal
Increase a polarization beam apparatus, flashlight is decomposed into two vertical polarization states, complete respective using polarization maintaining optical fibre interference ring
Interference under polarization state, obtain preferable result of interference, it is to avoid birefringence effect influence polarization state in optical fiber transmitting procedure
Influence to result of interference, while having abandoned deviation-rectifying system, simplifies the lengthy and jumbled degree of system, also reduces production cost；
(2) present invention only adjusts a phase, the requirement to used DAC and analogue amplifier by an interference ring
10 minus six powers magnitudes of only existing mode, greatly reduce the requirement of system design.In wherein existing mode, in transmitting terminal
Four phases are adjusted using an interference ring, it is necessary to which high-speed DAC is changed to modulation voltage during this regulation again, needed
High speed analog amplifier is wanted to be amplified to the size required by interference ring modulation voltage after conversion, meanwhile, the present invention is used
The modes of the direct-connected eight Waveguide interference rings of eight signal lasers carries out optical signal phase modulation, has abandoned and has used intensity modulation
Device inveigles optical signal the modulation of state etc. and the selection modulated to optical signal phase of being opened the light using light intensity modulator or light, one
Determine to improve the formation efficiency of key in degree；
(3) present invention is using the interference ring made by planar optical waveguide, because planar optical waveguide has polarization insensitive,
So that system is without extra polarization compensation means, traditional fiber interferometer is artificial manufacture, precision about tens mostly in addition
Micron dimension, its manufacturing process is complex, and the manufacture craft of waveguide is extremely ripe, can reach sub-micrometer scale, preferably
The key for improving system into code check.
Brief description of the drawings
The theory diagram for the quantum key dispatching system that Fig. 1 is modulated for the present invention based on interference ring single-phase；
Fig. 2 is the theory diagram of Waveguide interference ring of the present invention.
In figure：Transmitting terminal 100, transmitting terminal driving plate 101, signal laser 102, synchronous laser 103, Waveguide interference ring
104, the first adjustable attenuator 105, Waveguide interference ring 104, the first adjustable attenuator 105, the second adjustable attenuator 106, transmitting
Hold multiplexer 107, depolarizer 108, receiving terminal 200, receiving terminal driving plate 201, receiving terminal multiplexer 202, synchroprobe
203rd, polarization beam apparatus 204, single-photon detector 205, front end coupler 1041, rear end coupler 1042, the first coupler
1043, be delayed waveguide 1044, the second coupler 1045, silicon waveguide 1046, phase-modulator 1047, the 3rd adjustable attenuator
1048, quantum channel 300.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the present invention is clearly and completely described.
As shown in figure 1, a kind of quantum key dispatching system modulated based on interference ring single-phase, including pass through quantum channel
The transmitting terminal 100 of connection and receiving terminal 200, the transmitting terminal 100 includes transmitting terminal driving plate 101, signal laser 102, same
Walk laser 103, eight road Waveguide interference rings 104, the first adjustable attenuator 105, the second adjustable attenuator 106 and transmitting terminal multiple
With device 107,104 points of eight road signal laser is two groups, per the tunnels of Zu Ge tetra-, and one of which is signal state intensity, another group
To inveigle state intensity, vacuum state is modulated using not trigger signal laser 102, wherein, transmitting terminal multiplexer 107 can be used
Wavelength division multiplexer or adaptive multiplexer, described different per the arm length difference of tetra- road Waveguide interference rings of Zu 104, its phase difference is respectively
0, pi/2, π, 3 pi/2s, eight road signal laser 102 is connected respectively eight road Waveguide interference rings 104, eight tunnel waveguide
Interference ring 104 is connected with the first adjustable attenuator 105, wherein, first adjustable attenuator 107 passes through a depolarizer 108
Each road signal laser 104 is connected respectively, and the depolarizer 108 is used to polarised light being converted to non-polarized light, to ensure signal
The security of optical transmission process, the connection transmitting terminal of the first adjustable attenuator 105 multiplexer 107, the synchronous laser 103
It is sequentially connected the second adjustable attenuator 106 and transmitting terminal multiplexer 107, first adjustable attenuator 105 and second adjustable
Same one end of the connection transmitting terminal of attenuator 106 multiplexer 107, the transmitting terminal driving plate 101 connects signal laser respectively
102nd, Waveguide interference ring 104, synchronous laser 103, the first adjustable attenuator 105 and the second adjustable attenuator 106；
The receiving terminal 200 includes receiving terminal driving plate 201, receiving terminal multiplexer 202, synchroprobe 203, polarization point
Beam device 204, two-way Waveguide interference ring 104 and single-photon detector 205, wherein, receiving terminal multiplexer 202 can be using solution wavelength-division
Multiplexer or solution adaptive multiplexer, the receiving terminal multiplexer 202 connect transmitting terminal multiplexer 107 by quantum channel 300,
The other end of the receiving terminal multiplexer 202 connects synchroprobe 203 and polarization beam apparatus 204, the polarization beam splitting respectively
Device 204 connects two-way Waveguide interference ring 104 respectively successively, wherein, two-way Waveguide interference ring 104 is respectively connected with two-way single-photon detecting
Device 205 is surveyed, the receiving terminal driving plate 201 connects synchroprobe 203, Waveguide interference ring 104 and single photon detection respectively
Device 205.
As shown in Fig. 2 the Waveguide interference ring 104 includes front end coupler 1041, long-armed Wave guide unit, galianconism waveguide list
Member and rear end coupler 1042, the output end of the front end coupler 1041 connect long-armed Wave guide unit and galianconism ripple respectively
Unit is led, the output end of long-armed Wave guide unit and the galianconism Wave guide unit connects rear end coupler 1042, the length respectively
Arm Wave guide unit includes the first coupler 1043, the delay coupler 1045 of waveguide 1044 and second, first coupler
1043 connect the output end of front end coupler 1041 by silicon waveguide 1046, and first coupler 1043 passes through the waveguide that is delayed
1044 the second couplers 1045 of connection, second coupler 1045 connects the defeated of rear end coupler 1042 by silicon waveguide 1046
Enter end, the galianconism Wave guide unit connects the output end and rear end coupler of front end coupler 1041 using silicon waveguide 1046
Phase-modulator 1047 is provided with 1042 input, long-armed Wave guide unit and/or the galianconism Wave guide unit.
The phase-modulator 1047 makes PN junction using the plasma dispersion effect principle of silicon in silicon waveguide 1046
Structure, the cross section structure of its silicon waveguide 1046 is ridged, and the doped structure of its PN junction includes but is not limited to be PIN-type, reverse PN
Type, MOS structure type.The Carrier Profile for changing PN junction is driven by external voltage, and then changes the refraction of doped region silicon waveguide
Rate reaches the purpose for changing AMZI (unequal arm interferometer) two-arm phase difference.The response speed of phase-modulator 1047 is subnanosecond
Level, it is possible to achieve the high speed adjustment of phase.
The delay waveguide 1044 is the waveguide of low-loss silicon, silica waveguide, SiON waveguides, Si3N4Waveguide and polymer
One kind or combination in waveguide.The function of described delay waveguide 1044 is to provide the delay of light, and it is adopted as low-loss
Waveguide, the loss of unit length is significantly lower than ordinary silicon waveguide.For example, the loss of ordinary silicon waveguide is 2-3dB/cm, and it is sharp
The loss only 0.02dB/cm of the delay waveguide 1044 made of silica material, loss is about the 1/100 of ordinary silicon waveguide.
The material of delay waveguide 1044 includes silicon, silica, SiON, Si3N4, polymer (Polymer) etc..Made using silicon materials
Delay waveguide 1044 is, it is necessary to silicon waveguide be handled by special process such as hydrogen annealing or thermal oxides, the side of reduction silicon waveguide
Wall roughness, to improve the loss of waveguide.Using silica, SiON, Si3N4The delay waveguide 1044 that material makes, it is necessary first to
Material is deposited on silicon base chip using chemical vapour deposition technique (such as PECVD or LPCVD), ultraviolet photolithographic technique is recycled
The mask pattern of delay waveguide 8 is formed, finally mask pattern is shifted using ICP (inductively coupled plasma etching) etching technics
Delay waveguide 1044 is formed on to the material of deposition.When making delay waveguide 1044 using polymer, generally require polymer
Material is uniformly spin-coated on silicon base chip by whirl coating technique, recycles the formation polymerization of the technique such as photoetching process or nano impression
The delay waveguide 1044 of thing material.The structure of delay waveguide includes bar shaped, ridged, circle, platypelloid type etc..
In another embodiment, the 3rd adjustable attenuator 1048 is provided with the galianconism Wave guide unit, it is described adjustable to decline
Subtract device 1068 can by by the attenuated optical signal in galianconism to it is long-armed in it is consistent, it is possible to decrease to the delay low-loss of waveguide 1044
Requirement.
The first described coupler 1043 provides optical coupled, the second coupler of silicon waveguide 1046 and delay waveguide 1044
1045 provide delay waveguides 1044 and silicon waveguide 1046 it is optical coupled.The knot of first coupler 1043 and the second coupler 1045
Structure includes adiabatic waveguide coupled structure, back taper coupled structure, evanescent wave coupled structure.
The signal laser 102 is same multiplexed laser with synchronous laser 104, and the multiplexed laser can be used
Time-multiplexed mode transmission signal light and synchronizable optical, the transmitting terminal multiplexer 107 are adaptive multiplexer, and the receiving terminal is answered
It is solution adaptive multiplexer with device 202.
Present invention also offers a kind of quantum key distribution method modulated based on interference ring single-phase, including following step
Suddenly：
1) laser is triggered：Transmitting terminal triggers synchronous laser using a clock signal and launches synchronizable optical, described same
Light is walked as synchronous transmission of signal to receiving terminal as used in synchroprobe response is receiving terminal, meanwhile, the clock signal pair
Being triggered all the way in eight road signal lasers does not trigger generation flashlight, and the flashlight is used as modulation light；
2) state modulation is inveigled：The transmitting luminous power of eight road signal lasers is divided into two groups and each group is four tunnels, and one group is
Signal state intensity, another group is trick state intensity, and vacuum state is modulated using laser is not triggered；
3) transmitting terminal is interfered：Respective four road signal laser corresponds to what four route waveguide fabrications were completed respectively in two groups
Arm Waveguide interference ring, described different per the road Waveguide interference ring arm length differences of Zu tetra-, its phase difference is respectively 0, pi/2, π, 3 pi/2s, is led to
Crossing triggering, signal laser is luminous all the way or does not trigger progress light path selection, completes the selection of transmitting terminal out of phase modulation；
4) automatically controlled adjustable attenuator is decayed to flashlight：Depolarizer flashlight carry out it is depolarized, it is depolarized after flashlight
Light pulse is decayed into single photon magnitude by the first adjustable attenuator, synchronizable optical adjusts synchronizable optical by the second adjustable attenuator
Save the strength range that can be responded to receiving terminal；
5) flashlight and synchronizable optical throughput subchannel transmission：Flashlight passes through quantum with synchronizable optical after transmitting terminal is compound
Transmission is decomposed again to receiving terminal, and in receiving terminal, and flashlight enters polarization beam apparatus, and synchronizable optical passes through synchronous optical detection
Device is detected；
6) polarization beam apparatus beam splitting：The light of asynchronous polarization is decomposed into horizontal polarization direction by polarization beam apparatus and hung down
Straight polarization direction；
7) receiving terminal is interfered：The flashlight of horizontal polarization direction and vertical polarization is respectively connected to two brachiums of two-way
The different Waveguide interference ring of difference carries out phase-modulation, and phase difference is respectively 0, pi/2, completes the selection of receiving terminal out of phase；
8) single-photon detector is detected：Single-photon detector detects optical signals, and safe key is produced for subsequent treatment.
The step 5) in, flashlight and synchronizable optical are combined in transmitting terminal can use wavelength-division multiplex or time-multiplexed side
Formula is carried out, and decompose correspondence in receiving terminal is carried out using solution wavelength-division multiplex or solution time division multiplexing mode.
The step 5) if the mode of flashlight and synchronizable optical multiplexing of transmission is used when being time-multiplexed, the signal laser
Flashlight and synchronizable optical can be sent using any one laser timesharing with synchronous laser, single laser is driven in systems
Using time-multiplexed mode transmission signal light and synchronizable optical, the numerous and diverse degree and production cost of system are effectively reduced.
Knowable to the system architecture and principle of the comprehensive present invention, the invention has the advantages that：
(1) quantum key dispatching system modulated based on interference ring single-phase of the invention and method, by receiving terminal
Increase a polarization beam apparatus, flashlight is decomposed into two vertical polarization states, complete respective using polarization maintaining optical fibre interference ring
Interference under polarization state, obtain preferable result of interference, it is to avoid birefringence effect influence polarization state in optical fiber transmitting procedure
Influence to result of interference, while having abandoned deviation-rectifying system, simplifies the lengthy and jumbled degree of system, also reduces production cost；
(2) present invention only adjusts a phase, the requirement to used DAC and analogue amplifier by an interference ring
10 minus six powers magnitudes of only existing mode, greatly reduce the requirement of system design.In wherein existing mode, in transmitting terminal
Four phases are adjusted using an interference ring, it is necessary to which high-speed DAC is changed to modulation voltage during this regulation again, needed
High speed analog amplifier is wanted to be amplified to the size required by interference ring modulation voltage after conversion, meanwhile, the present invention is used
The modes of the direct-connected eight Waveguide interference rings of eight signal lasers carries out optical signal phase modulation, has abandoned and has used intensity modulation
Device inveigles optical signal the modulation of state etc. and the selection modulated to optical signal phase of being opened the light using light intensity modulator or light, one
Determine to improve the formation efficiency of key in degree；
(3) present invention is using the interference ring made by planar optical waveguide, because planar optical waveguide has polarization insensitive,
So that system is without extra polarization compensation means, traditional fiber interferometer is artificial manufacture, precision about tens mostly in addition
Micron dimension, its manufacturing process is complex, and the manufacture craft of waveguide is extremely ripe, can reach sub-micrometer scale, preferably
The key for improving system into code check.
Claims (7)
1. a kind of quantum key dispatching system modulated based on interference ring single-phase, it is characterised in that：Including passing through quantum channel
The transmitting terminal and receiving terminal of connection, the transmitting terminal include transmitting terminal driving plate, eight road signal lasers, synchronous laser, eight
Road Waveguide interference ring, the first adjustable attenuator, the second adjustable attenuator and transmitting terminal multiplexer, eight road signal laser
It is divided into two groups, per the tunnels of Zu Ge tetra-, one of which is signal state intensity, and another group is trick state intensity, described per the road ripples of Zu tetra-
Lead interference ring arm length difference different, its phase difference is respectively 0, pi/2, π, 3 pi/2s, and eight road signal laser is connected respectively
Eight road Waveguide interference rings, the eight roads Waveguide interference ring is connected with the first adjustable attenuator, and first adjustable attenuator connects
Transmitting terminal multiplexer is connect, the synchronous laser is sequentially connected the second adjustable attenuator and transmitting terminal multiplexer, described first
Adjustable attenuator is connected same one end of transmitting terminal multiplexer with the second adjustable attenuator, and the transmitting terminal driving plate connects letter respectively
Number laser, Waveguide interference ring, synchronous laser, the first adjustable attenuator and the second adjustable attenuator；
The receiving terminal is done including receiving terminal driving plate, receiving terminal multiplexer, synchroprobe, polarization beam apparatus, two-way waveguide
Ring and single-photon detector are related to, the receiving terminal multiplexer connects transmitting terminal multiplexer, the receiving terminal by quantum channel
The other end of multiplexer connects synchroprobe and polarization beam apparatus respectively, and the polarization beam apparatus connects two-way ripple respectively successively
Interference ring is led, wherein, two-way Waveguide interference ring is respectively connected with two-way single-photon detector, and the receiving terminal driving plate is connected respectively
Synchroprobe, Waveguide interference ring and single-photon detector.
2. the quantum key dispatching system as claimed in claim 1 modulated based on interference ring single-phase, it is characterised in that described
Waveguide interference ring includes front end coupler, long-armed Wave guide unit, galianconism Wave guide unit and rear end coupler, the front end coupling
The output end of device connects long-armed Wave guide unit and galianconism Wave guide unit, long-armed Wave guide unit and galianconism the waveguide list respectively
The output end of member connects rear end coupler respectively, and the long-armed Wave guide unit includes the first coupler, delay waveguide and second
Coupler, first coupler connects the output end of front end coupler by silicon waveguide, and first coupler passes through delay
Waveguide connects the second coupler, and second coupler connects the input of rear end coupler, the galianconism ripple by silicon waveguide
Lead unit and the output end of front end coupler and the input of rear end coupler, the long-armed Wave guide unit are connected using silicon waveguide
And/or it is provided with phase-modulator on galianconism Wave guide unit.
3. the quantum key dispatching system as claimed in claim 2 modulated based on interference ring single-phase, it is characterised in that described
The waveguide that is delayed is the waveguide of low-loss silicon, silica waveguide, SiON waveguides, Si3N4One kind in waveguide and polymer waveguide or
Adjustable attenuator is provided with combination, the galianconism Wave guide unit.
4. the quantum key dispatching system as claimed in claim 2 modulated based on interference ring single-phase, it is characterised in that described
Signal laser is same multiplexed laser with synchronous laser, and the multiplexed laser can be launched using time-multiplexed mode
Flashlight and synchronizable optical, the transmitting terminal multiplexer are adaptive multiplexer, and the receiving terminal multiplexer is solution adaptive multiplexer.
5. a kind of quantum key distribution method modulated based on interference ring single-phase, it is characterised in that comprise the following steps：
1) laser is triggered：Transmitting terminal triggers synchronous laser using a clock signal and launches synchronizable optical, the synchronizable optical
As synchronous transmission of signal to receiving terminal as used in synchroprobe response is receiving terminal, meanwhile, the clock signal is to eight tunnels
Being triggered all the way in signal laser does not trigger generation flashlight, and the flashlight is used as modulation light；
2) state modulation is inveigled：The transmitting luminous power of eight road signal lasers is divided into two groups and each group is four tunnels, and one group is signal
State intensity, another group is trick state intensity, and vacuum state is modulated using laser is not triggered；
3) transmitting terminal is interfered：Respective four road signal laser corresponds to the unequal arm ripple that four route waveguide fabrications are completed respectively in two groups
Interference ring is led, described different per the road Waveguide interference ring arm length differences of Zu tetra-, its phase difference is respectively 0, pi/2, π, 3 pi/2s, by touching
Signal laser is luminous all the way or does not trigger progress light path selection for hair, completes the selection of transmitting terminal out of phase modulation；
4) automatically controlled adjustable attenuator is decayed to flashlight：Depolarizer flashlight carry out it is depolarized, it is depolarized after flashlight pass through
Light pulse is decayed to single photon magnitude by the first adjustable attenuator, synchronizable optical by the second adjustable attenuator by synchronizable optical adjust to
The strength range that receiving terminal can be responded；
5) flashlight and synchronizable optical throughput subchannel transmission：Flashlight passes through quantum channel with synchronizable optical after transmitting terminal is compound
Transmit to receiving terminal, and decomposed again in receiving terminal, flashlight enters polarization beam apparatus, synchronizable optical is visited by synchronous photo-detector
Survey；
6) polarization beam apparatus beam splitting：The light of asynchronous polarization is decomposed into horizontal polarization direction and vertical inclined by polarization beam apparatus
Shake direction；
7) receiving terminal is interfered：The flashlight of horizontal polarization direction and vertical polarization is respectively connected to two arm length differences of two-way not
Same Waveguide interference ring carries out phase-modulation, and phase difference is respectively 0, pi/2, completes the selection of receiving terminal out of phase；
8) single-photon detector is detected：Single-photon detector detects optical signals, and safe key is produced for subsequent treatment.
6. quantum key distribution method as claimed in claim 5, it is characterised in that the step 5) in, to flashlight and together
Walk light and be combined and can be carried out using wavelength-division multiplex or time-multiplexed mode in transmitting terminal, decomposing corresponding use in receiving terminal solves wavelength-division
Multiplexing or solution time division multiplexing mode are carried out.
7. quantum key distribution method as claimed in claim 6, it is characterised in that the step 5) if flashlight and synchronizable optical
When the mode of multiplexing of transmission is using time division multiplexing, the signal laser can be using any one laser point with synchronous laser
When send flashlight and synchronizable optical.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710629272.1A CN107196715A (en) | 2017-07-28 | 2017-07-28 | A kind of quantum key dispatching system modulated based on interference ring single-phase and method |
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| CN201710629272.1A CN107196715A (en) | 2017-07-28 | 2017-07-28 | A kind of quantum key dispatching system modulated based on interference ring single-phase and method |
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| CN107196715A true CN107196715A (en) | 2017-09-22 |
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| CN201710629272.1A Pending CN107196715A (en) | 2017-07-28 | 2017-07-28 | A kind of quantum key dispatching system modulated based on interference ring single-phase and method |
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| CN109962770A (en) * | 2017-12-14 | 2019-07-02 | 科大国盾量子技术股份有限公司 | Silicon-based monolithic integrates quantum key distribution sender chip structure and its encapsulating structure |
| CN110389406A (en) * | 2018-04-17 | 2019-10-29 | 华为技术有限公司 | A kind of waveguide assemblies, unequal arm Mach-Zehnder interferometer and parameter determination method |
| CN111307282A (en) * | 2020-02-24 | 2020-06-19 | 四川九洲电器集团有限责任公司 | Single photon source preparation system and method |
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| CN114499685A (en) * | 2022-01-28 | 2022-05-13 | 中国科学技术大学 | Signal processing method, transmitting end system, electronic device and storage medium |
| CN114499685B (en) * | 2022-01-28 | 2023-10-20 | 中国科学技术大学 | Signal processing method, transmitting terminal system, electronic device and storage medium |
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