CN106856429A - A kind of quantum key dispatching system and method based on receiving terminal polarization beam splitting - Google Patents
A kind of quantum key dispatching system and method based on receiving terminal polarization beam splitting Download PDFInfo
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- CN106856429A CN106856429A CN201710135254.8A CN201710135254A CN106856429A CN 106856429 A CN106856429 A CN 106856429A CN 201710135254 A CN201710135254 A CN 201710135254A CN 106856429 A CN106856429 A CN 106856429A
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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
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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
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/614—Coherent receivers comprising one or more polarization beam splitters, e.g. polarization multiplexed [PolMux] X-PSK coherent receivers, polarization diversity heterodyne coherent receivers
-
- 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
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/615—Arrangements affecting the optical part of the receiver
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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
- H04L9/0858—Details about key distillation or coding, e.g. reconciliation, error correction, privacy amplification, polarisation coding or phase coding
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Theoretical Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Optics & Photonics (AREA)
- Optical Communication System (AREA)
Abstract
A kind of quantum key dispatching system based on receiving terminal polarization beam splitting, including transmitting terminal and receiving terminal, the transmitting terminal includes transmitting terminal driving plate, signal laser, synchronous laser, intensity modulator, polarization-maintaining beam splitter, first adjustable attenuator, second adjustable attenuator and transmitting terminal wavelength division multiplexer, the receiving terminal includes receiving terminal driving plate, receiving terminal wavelength division multiplexer, synchroprobe, polarization beam apparatus, polarization-maintaining beam splitter and single-photon detector, the receiving terminal wavelength division multiplexer connects transmitting terminal wavelength division multiplexer by quantum channel, the present invention also provides a kind of quantum key distribution method based on receiving terminal polarization beam splitting.Compared with prior art, the present invention increases a polarization beam apparatus by 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, deviation-rectifying system has been abandoned simultaneously, the lengthy and jumbled degree of system has been simplified, production cost has been also reduced.
Description
Technical field
The present invention relates to optical transport safety communication technology field, more particularly to a kind of quantum based on receiving terminal polarization beam splitting
Key dispatching system and method.
Background technology
With the popularization on a large scale of internet, the information transmission between the mankind has reached unprecedented quantity and frequency,
Various privacy informations expose on the internet more and more, 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
Algorithm, the public-key cryptography propagated on 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 that 20 century 70s are born, i.e., using big number matter because
Son decomposes and is difficult to calculate 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.
In the prior art quantum key transmitting terminal produce flashlight, by traditional quantum channel transmitting procedure in, by
Acted in by fiber channel birefringence etc., its polarization state is more big changes, influence the interference effect in optical signal later stage, can 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, existing key dispatching system at least needs four tunnels
Single-photon detector carries out detection treatment, further increased the complexity and production cost of system.
The content of the invention
Present invention aim at a kind of quantum key dispatching system and method based on receiving terminal polarization beam splitting is provided, to solve
Certainly correction can be increased in receiving terminal to solve the problems, such as that flashlight transmits polarization state change in quantum channel in the prior art
System, the polarization state of optical signal is reduced by deviation-rectifying system, but deviation-rectifying system needs complicated hardware and software section
Composition, brings the complexity of total system and improves the technical bug of production cost to whole key dispatching system.
The technical proposal of the invention is realized in this way：
A kind of quantum key dispatching system based on receiving terminal polarization beam splitting, including transmitting terminal and receiving terminal, the transmitting
End be connected by quantum channel with receiving terminal, the transmitting terminal including transmitting terminal driving plate, signal laser, synchronous laser,
Intensity modulator, interference unit, the first adjustable attenuator, the second adjustable attenuator and transmitting terminal wavelength division multiplexer, the letter
Number laser is sequentially connected intensity modulator, interference unit, the first adjustable attenuator and transmitting terminal wavelength division multiplexer, described same
Step laser is sequentially connected the second adjustable attenuator and transmitting terminal wavelength division multiplexer, and first adjustable attenuator and second can
Controlled attenuator connects same one end of transmitting terminal wavelength division multiplexer, and transmitting terminal driving plate connects signal laser, intensity modulated respectively
Device, phase regulator, synchronous laser, the first adjustable attenuator and the second adjustable attenuator；
The receiving terminal includes receiving terminal driving plate, receiving terminal wavelength division multiplexer, synchroprobe, polarization beam apparatus, two
Road interference unit arranged side by side and two-way single-photon detector, the receiving terminal wavelength division multiplexer is connected by quantum channel to be launched
End wavelength division multiplexer, the other end of the receiving terminal wavelength division multiplexer connects synchroprobe and polarization beam apparatus respectively, described
Polarization beam apparatus connect two-way interference unit respectively, and the receiving terminal driving plate connects synchroprobe, phase regulator respectively
And two-way single-photon detector,
The interference unit includes front end polarization-maintaining beam splitter and rear end polarization-maintaining beam splitter, and front end polarization-maintaining beam splitter passes through respectively
Long-armed polarization maintaining optical fibre and galianconism polarization maintaining optical fibre are connected with rear end polarization-maintaining beam splitter, and phase is connected with the long-armed polarization maintaining optical fibre
Adjuster, the two-way interference unit of the receiving terminal part includes exporting all the way respectively, and two-way output connects single all the way respectively
Photon detector.
Preferably, the quantum channel is single-mode fiber.
Preferably, the transmitting terminal also includes depolarizer, and the depolarizer is arranged on rear end polarization-maintaining beam splitter and
Between one adjustable attenuator.
A kind of quantum key distribution method based on receiving terminal polarization beam splitting based on claim 1, comprises the following steps：
1) laser triggering：Transmitting terminal distinguishes trigger signal laser and synchronous laser hair using same clock signal
Project flashlight and synchronizable optical, the flashlight as modulation light, the synchronizable optical as synchronous transmission of signal to receiving terminal by
Synchroprobe response is used by receiving terminal；
2) state modulation is inveigled：The flashlight of signal laser transmitting carries out random strength modulation by intensity modulator, into
For signal state, inveigle state or vacuum state；
3) transmitting terminal interference：Unequal arm MZ is made using interference unit to interfere, flashlight is divided into two by polarization-maintaining beam splitter
Individual pulse, wherein all the way by long-armed, it is long-armed in added with phase-modulator, random 4 phase-modulation is carried out to flashlight, respectively
0, pi/2, π, 3 pi/2s, galianconism does not do phase-modulation；
4) automatically controlled adjustable attenuator is decayed to flashlight：Flashlight decays light pulse by the first adjustable attenuator
To single photon magnitude, synchronizable optical is adjusted the strength range that can be responded to receiving terminal by synchronizable optical by the second adjustable attenuator；
5) flashlight and synchronizable optical throughput subchannel transmission：The different flashlight of wavelength and synchronizable optical are passed through in transmitting terminal
Cross transmitting terminal wavelength division multiplexer and be incorporated into a transmission, and decomposed again by receiving terminal wavelength division multiplexer in receiving terminal；
6) polarization beam apparatus beam splitting：The light of asynchronous polarization is decomposed into horizontal polarization direction and hung down by polarization beam apparatus
Straight polarization direction；
7) receiving terminal interference：The unequal arm MZ equal with transmitting terminal arm length difference is made using front end polarization-maintaining beam splitter to interfere
Ring, flashlight is divided into two pulses by front end polarization-maintaining beam splitter, wherein all the way by long-armed, it is long-armed in added with phase-modulation
Device, carries out random 4 phase-modulation to flashlight, and respectively 0, pi/2, π, 3 pi/2s, galianconism is not modulated；
8) single-photon detector detection：Single-photon detector detects optical signals, and safe key is produced for subsequent treatment.
Compared with prior art, the present invention has following beneficial effect：
Quantum key dispatching system and method based on receiving terminal polarization beam splitting of the invention, one is increased by receiving terminal
Individual polarization beam apparatus, two vertical polarization states are decomposed into by flashlight, and respective polarization state is completed using polarization maintaining optical fibre interference ring
Under interference, obtain preferable result of interference, it is to avoid birefringence effect influence polarization state is to interference during Optical Fiber Transmission
The influence of result, while having abandoned deviation-rectifying system, simplifies the lengthy and jumbled degree of system, also reduces production cost, in addition, the system is only
Need to carry out detection treatment using two-way single-photon detector, reduce further the lengthy and jumbled degree of system, reduce production cost.
Brief description of the drawings
Fig. 1 is the theory diagram of quantum key dispatching system of the present invention based on receiving terminal polarization beam splitting；
Fig. 2 is the flow chart of quantum key distribution method of the present invention based on receiving terminal polarization beam splitting；
Fig. 3 signal light modulation table of the invention.
In figure：Transmitting terminal 1, transmitting terminal driving plate 101, signal laser 102, synchronous laser 103, intensity modulator
104, the first adjustable attenuator 105, the second adjustable attenuator 106, transmitting terminal wavelength division multiplexer 107, depolarizer 108, receiving terminal
2, receiving terminal driving plate 201, receiving terminal wavelength division multiplexer 202, synchroprobe 203, polarization beam apparatus 204, single photon detection
Device 205, quantum channel 3, interference unit 4, phase regulator 401, front end polarization-maintaining beam splitter 402, rear end polarization-maintaining beam splitter 403.
Specific 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 based on receiving terminal polarization beam splitting, including transmitting terminal 1 and reception
End 2, the transmitting terminal 1 is connected with receiving terminal 2 by quantum channel 3, and the transmitting terminal 1 includes transmitting terminal driving plate 101, signal
Laser 102, synchronous laser 103, intensity modulator 104, interference unit 4, the first adjustable attenuator 105, second is adjustable declines
Subtract device 106 and transmitting terminal wavelength division multiplexer 107, the signal laser 102 is sequentially connected intensity modulator 104, interference list
First 4, first adjustable attenuator 105 and transmitting terminal wavelength division multiplexer 107, the synchronous laser 103 is sequentially connected second can
Controlled attenuator 106 and transmitting terminal wavelength division multiplexer 107, first adjustable attenuator 105 connect with the second adjustable attenuator 106
Same one end of transmitting terminal wavelength division multiplexer 107 is connect, transmitting terminal driving plate 101 connects signal laser 102, intensity modulator respectively
104th, phase regulator 401, synchronous laser 103, the first adjustable attenuator 105 and the second adjustable attenuator 106, the hair
Penetrate the phase regulator 401 and intensity modulator 104, the first adjustable attenuator 105, the second adjustable attenuator 106 of 1 part of end
Transmitting terminal driving plate 101 is connected by analog control signal line respectively, the signal laser 102, synchronous laser 103 are distinguished
Transmitting terminal driving plate 101 is connected by digital controlled signal line；
The receiving terminal 2 includes receiving terminal driving plate 201, receiving terminal wavelength division multiplexer 202, synchroprobe 203, polarization
Beam splitter 204, two-way interference unit 4 arranged side by side and two-way single-photon detector 205, the receiving terminal wavelength division multiplexer 202
Transmitting terminal wavelength division multiplexer 107 is connected by quantum channel 3, the other end of the receiving terminal wavelength division multiplexer 202 is connected respectively
Synchroprobe 203 and polarization beam apparatus 204, the polarization beam apparatus 204 connect two-way interference unit 4, the reception respectively
End driving plate 201 connects synchroprobe 203, phase regulator 401 and single-photon detector 205, the receiving terminal 2 respectively
Partial phase regulator 401 connects receiving terminal driving plate 201 by analog control signal line.The interference unit 4 includes preceding
End polarization-maintaining beam splitter 402 and rear end polarization-maintaining beam splitter 403, front end polarization-maintaining beam splitter 402 respectively by long-armed polarization maintaining optical fibre and
Galianconism polarization maintaining optical fibre is connected with rear end polarization-maintaining beam splitter 403, and phase regulator 401, institute are connected with the long-armed polarization maintaining optical fibre
Stating the two-way interference unit 4 of the part of receiving terminal 2 includes exporting all the way respectively, and two-way output connects single photon detection all the way respectively
Device 205.
In the present embodiment, the quantum channel 3 is single-mode fiber, if quantum channel 3 can also be adopted apart from need not be long
Transmitted with polarization maintaining optical fibre, to increase the stability of signal polarization state.The transmitting terminal 1 also includes depolarizer 108, described to disappear
Inclined device 108 is arranged between the adjustable attenuator 104 of rear end polarization-maintaining beam splitter 403 and first, and the depolarizer 108 can be by signal
The degree of polarization of light is reduced to 0 so that the polarization state of flashlight is nature light state, is effectively guaranteed the safety of system transfers key
Property.
As shown in Fig. 2 close present invention also offers a kind of quantum based on receiving terminal polarization beam splitting based on claim 1
Key distribution method, the distribution method can be realized based on above-mentioned quantum key dispatching system, comprised the following steps：
1) laser triggering：Transmitting terminal distinguishes trigger signal laser and synchronous laser hair using same clock signal
Project flashlight and synchronizable optical, the flashlight as modulation light, the synchronizable optical as synchronous transmission of signal to receiving terminal by
Synchroprobe response is used by receiving terminal；
2) state modulation is inveigled：The flashlight of signal laser transmitting carries out random strength modulation by intensity modulator, into
For signal state, inveigle state or vacuum state；
3) transmitting terminal interference：Unequal arm MZ is made using interference unit to interfere, flashlight is divided into two by polarization-maintaining beam splitter
Individual pulse, wherein all the way by long-armed, it is long-armed in added with phase-modulator, random 4 phase-modulation is carried out to flashlight, respectively
0, pi/2, π, 3 pi/2s, galianconism does not do phase-modulation；
4) automatically controlled adjustable attenuator is decayed to flashlight：Flashlight decays light pulse by the first adjustable attenuator
To single photon magnitude, synchronizable optical is adjusted the strength range that can be responded to receiving terminal by synchronizable optical by the second adjustable attenuator；
5) flashlight and synchronizable optical throughput subchannel transmission：The different flashlight of wavelength and synchronizable optical are passed through in transmitting terminal
Cross transmitting terminal wavelength division multiplexer and be incorporated into a transmission, and decomposed again by receiving terminal wavelength division multiplexer in receiving terminal；
6) polarization beam apparatus beam splitting：The light of asynchronous polarization is decomposed into horizontal polarization direction and hung down by polarization beam apparatus
Straight polarization direction；
7) receiving terminal interference：The unequal arm MZ equal with transmitting terminal arm length difference is made using front end polarization-maintaining beam splitter to interfere
Ring, flashlight is divided into two pulses by front end polarization-maintaining beam splitter, wherein all the way by long-armed, it is long-armed in added with phase-modulation
Device, carries out random 4 phase-modulation to flashlight, and respectively 0, pi/2, π, 3 pi/2s, galianconism is not modulated；
8) single-photon detector detection：Single-photon detector detects optical signals, and safe key is produced for subsequent treatment.
As shown in figure 3, wherein 1. representing photon by there is the end of single-photon detector 205, photon is 2. represented by without monochromatic light
The end of sub- detector 205,1/2 representative respectively has half probability, from following table it can be seen that when receiving terminal uses 4 phase-modulation, only needing
Key distribution can be just completed using single single-photon detector 205, cost is so not only can be reduced, can also reduce many
The safety issue that detector brings when matching.
Knowable to comprehensive structure of the invention and principle, the quantum-key distribution system based on receiving terminal polarization beam splitting of the invention
System and method, a polarization beam apparatus are increased by receiving terminal, flashlight are decomposed into two vertical polarization states, using guarantor
Inclined fiber interferometer completes the interference under respective polarization state, obtains preferable result of interference, it is to avoid double during Optical Fiber Transmission
Refraction effect influences influence of the polarization state to result of interference, while having abandoned deviation-rectifying system, simplifies the lengthy and jumbled degree of system, also drops
Low production cost, in addition, the system only needs to carry out detection treatment using two-way single-photon detector, reduce further and be
The lengthy and jumbled degree of system, reduces production cost.
Claims (4)
1. a kind of quantum key dispatching system based on receiving terminal polarization beam splitting, it is characterised in that：Including transmitting terminal and receiving terminal,
The transmitting terminal is connected with receiving terminal by quantum channel, and the transmitting terminal includes transmitting terminal driving plate, signal laser, synchronization
Laser, intensity modulator, interference unit, the first adjustable attenuator, the second adjustable attenuator and transmitting terminal wavelength division multiplexer,
The signal laser is sequentially connected intensity modulator, interference unit, the first adjustable attenuator and transmitting terminal wavelength division multiplexer,
The synchronous laser is sequentially connected the second adjustable attenuator and transmitting terminal wavelength division multiplexer, first adjustable attenuator with
Second adjustable attenuator connects same one end of transmitting terminal wavelength division multiplexer, and transmitting terminal driving plate connects signal laser, strong respectively
Degree modulator, phase regulator, synchronous laser, the first adjustable attenuator and the second adjustable attenuator；
The receiving terminal includes receiving terminal driving plate, receiving terminal wavelength division multiplexer, synchroprobe, polarization beam apparatus, two-way simultaneously
The interference unit and two-way single-photon detector of row, the receiving terminal wavelength division multiplexer connect transmitting terminal ripple by quantum channel
Division multiplexer, the other end of the receiving terminal wavelength division multiplexer connects synchroprobe and polarization beam apparatus, the polarization respectively
Beam splitter connects two-way interference unit respectively, the receiving terminal driving plate connect respectively synchroprobe, phase regulator and
Two-way single-photon detector,
The interference unit includes front end polarization-maintaining beam splitter and rear end polarization-maintaining beam splitter, and front end polarization-maintaining beam splitter is respectively by long-armed
Polarization maintaining optical fibre and galianconism polarization maintaining optical fibre are connected with rear end polarization-maintaining beam splitter, and phase adjusted is connected with the long-armed polarization maintaining optical fibre
Device, the two-way interference unit of the receiving terminal part includes exporting all the way respectively, and two-way output connects single photon all the way respectively
Detector.
2. the quantum key dispatching system of receiving terminal polarization beam splitting is based on as claimed in claim 1, it is characterised in that the amount
Subchannel is single-mode fiber.
3. the quantum key dispatching system of receiving terminal polarization beam splitting is based on as claimed in claim 1, it is characterised in that the hair
Penetrate end and also include depolarizer, the depolarizer is arranged between rear end polarization-maintaining beam splitter and the first adjustable attenuator.
4. a kind of quantum key distribution method based on receiving terminal polarization beam splitting based on claim 1, it is characterised in that including
Following steps：
1) laser triggering：Transmitting terminal using same clock signal, launch respectively by trigger signal laser and synchronous laser
Flashlight and synchronizable optical, used as modulation light, the synchronizable optical is as synchronous transmission of signal to receiving terminal by synchronization for the flashlight
Explorer response is used by receiving terminal；
2) state modulation is inveigled：The flashlight of signal laser transmitting carries out random strength modulation by intensity modulator, as letter
Number state, inveigle state or vacuum state；
3) transmitting terminal interference：Unequal arm MZ is made using interference unit to interfere, flashlight is divided into two arteries and veins by polarization-maintaining beam splitter
Punching, wherein all the way by long-armed, it is long-armed in added with phase-modulator, carry out random 4 phase-modulation to flashlight, respectively 0, π/
2, π, 3 pi/2s, galianconism does not do phase-modulation；
4) automatically controlled adjustable attenuator is decayed to flashlight：Light pulse is decayed to list by flashlight by the first adjustable attenuator
Synchronizable optical is adjusted the strength range that can be responded to receiving terminal by photon magnitude, synchronizable optical by the second adjustable attenuator；
5) flashlight and synchronizable optical throughput subchannel transmission：By the different flashlight of wavelength and synchronizable optical in transmitting terminal by sending out
Penetrate end wavelength division multiplexer and be incorporated into a transmission, and decomposed again by receiving terminal wavelength division multiplexer in receiving terminal；
6) polarization beam apparatus beam splitting：By the light of asynchronous polarization by polarization beam apparatus be decomposed into horizontal polarization direction and it is vertical partially
Shake direction；
7) receiving terminal interference：The unequal arm MZ interference ring equal with transmitting terminal arm length difference, letter are made using front end polarization-maintaining beam splitter
Number light is divided into two pulses by front end polarization-maintaining beam splitter, wherein all the way by long-armed, it is long-armed in added with phase-modulator, to letter
Number light carries out random 4 phase-modulation, and respectively 0, pi/2, π, 3 pi/2s, galianconism is not modulated；
8) single-photon detector detection：Single-photon detector detects optical signals, and safe key is produced for subsequent treatment.
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| WO2018161733A1 (en) * | 2017-03-08 | 2018-09-13 | 浙江九州量子信息技术股份有限公司 | Quantum key distribution system and method |
| CN109962772A (en) * | 2017-12-14 | 2019-07-02 | 科大国盾量子技术股份有限公司 | Silicon substrate based on coupled polarization beam splitter integrates quantum key distribution chip structure |
| CN110351071A (en) * | 2018-04-02 | 2019-10-18 | 浙江九州量子信息技术股份有限公司 | A kind of transmitting terminal is not necessarily to the quantum key distribution system and method for interference ring |
| CN110351068A (en) * | 2018-04-02 | 2019-10-18 | 浙江九州量子信息技术股份有限公司 | A kind of quantum key distribution system and method based on waveguide |
| CN110380853A (en) * | 2019-07-24 | 2019-10-25 | 赵义博 | A kind of polarization encoder quantum key distribution system |
| CN110430049A (en) * | 2019-07-24 | 2019-11-08 | 赵义博 | A kind of phase code quantum key distribution system of anti-polarization scrambling |
| CN111130780A (en) * | 2019-12-31 | 2020-05-08 | 无锡太湖学院 | Cross-medium device-independent and discrete modulation continuous variable quantum key distribution system |
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