CN106656494A - Quantum key allocation system and method based on continuous light chopping - Google Patents
Quantum key allocation system and method based on continuous light chopping Download PDFInfo
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- CN106656494A CN106656494A CN201710134189.7A CN201710134189A CN106656494A CN 106656494 A CN106656494 A CN 106656494A CN 201710134189 A CN201710134189 A CN 201710134189A CN 106656494 A CN106656494 A CN 106656494A
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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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- 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
- 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
- H04B10/80—Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water
- H04B10/85—Protection from unauthorised access, e.g. eavesdrop protection
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- Optics & Photonics (AREA)
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- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The invention discloses a quantum key allocation system and method based on continuous light chopping. A transmitting end comprises a continuous light signal laser, a synchronous laser, a continuous light chopping strength modulator, a decoy state strength modulator, a phase modulator, a first adjustable attenuator, a second adjustable attenuator and a transmitting end wavelength division multiplexer. A receiving end comprises a receiving end wavelength division multiplexer, a synchronous detector, a polarization beam splitter, a polarization-maintaining beam splitter and single photon detector. Compared with the prior art, the system and the method have the advantages that the polarization beam splitter is increased at the receiving end to split signal light into two vertical polarization states; interference under the polarization states is finished through utilization of polarization-maintaining optical fibers; a better interference result is obtained; the system tedious degree is simplified; moreover, a continuous light chopping form is employed at the transmitting end to obtain two light pulses with the consistent polarization states; the production of an interference ring of the transmitting end is avoided; the system tedious degree is further simplified; and the production cost is reduced.
Description
Technical field
The present invention relates to optical transport safety communication technology field, more particularly to a kind of quantum key based on continuous light copped wave
Distribution system and method.
Background technology
With the popularization on a large scale of the 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 to be made
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 decomposition is difficult to calculate to ensure the safety 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 safety of key.
Quantum key produces flashlight in transmitting terminal in prior art, in traditional quantum channel transmitting procedure, by
In through the effect such as fiber channel birefringence, its polarization state is more big changes, and affects the interference effect in optical signal later stage, can make
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.
The content of the invention
Present invention aim at provide a kind of quantum key dispatching system and method, to solve prior art in order to solve
Flashlight transmits the problem of polarization state change in quantum channel can increase deviation-rectifying system in receiving terminal, by deviation-rectifying system come also
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 the technical bug of production cost.
The technical scheme is that what is be achieved in that：
A kind of quantum key dispatching system based on continuous light copped wave, including transmitting terminal and receiving terminal, the transmitting terminal with
Receiving terminal is connected by quantum channel, and the transmitting terminal includes transmitting terminal driving plate, continuous optical signal laser instrument, synchronous laser
Device, continuous light chopping intensity manipulator, state intensity modulator, phase-modulator, the first adjustable attenuator, second is inveigled adjustable to decline
Subtract device and transmitting terminal wavelength division multiplexer, the continuous optical signal laser instrument is sequentially connected continuous light chopping intensity manipulator, lures
Deceive state intensity modulator, phase-modulator, the first adjustable attenuator and transmitting terminal wavelength division multiplexer, the synchronous laser according to
The second adjustable attenuator of secondary connection and transmitting terminal wavelength division multiplexer, first adjustable attenuator and the second adjustable attenuator connect
Same one end of transmitting terminal wavelength division multiplexer is connect, transmitting terminal driving plate connects respectively continuous optical signal laser instrument, synchronous laser, company
Continuous light chopping intensity manipulator, trick state intensity modulator, phase-modulator, the first adjustable attenuator and the second adjustable damping
Device；
The receiving terminal include receiving terminal driving plate, receiving terminal wavelength division multiplexer, synchroprobe, polarization beam apparatus, the
One polarization-maintaining beam splitter, the second polarization-maintaining beam splitter and single-photon detector, the receiving terminal wavelength division multiplexer passes through quantum channel
Connection transmitting terminal wavelength division multiplexer, the other end of the receiving terminal wavelength division multiplexer connects respectively synchroprobe and polarization beam splitting
Device, the polarization beam apparatus are sequentially connected the first polarization-maintaining beam splitter and the second polarization-maintaining beam splitter, first polarization-maintaining beam splitter point
Not Tong Guo long-armed polarization maintaining optical fibre and galianconism polarization maintaining optical fibre be connected with the second polarization-maintaining beam splitter, connect in the long-armed polarization maintaining optical fibre
The other end for having phase regulator, second polarization-maintaining beam splitter is connected with two-way single-photon detector, and the receiving terminal drives
Plate connects respectively synchroprobe, phase regulator and single-photon detector.
Preferably, the quantum channel is single-mode fiber.
Preferably, the receiving terminal also includes the 3rd polarization-maintaining beam splitter and the 4th polarization-maintaining beam splitter, the polarization beam splitting
Device is sequentially connected the 3rd polarization-maintaining beam splitter and the 4th polarization-maintaining beam splitter, and the 3rd polarization-maintaining beam splitter protects inclined by long-armed respectively
Optical fiber and galianconism polarization maintaining optical fibre are connected with the 4th polarization-maintaining beam splitter, and in the long-armed polarization maintaining optical fibre phase regulator is connected with,
The other end of the 4th polarization-maintaining beam splitter is connected with two-way single-photon detector.
Preferably, the transmitting terminal also includes depolarizer, and the depolarizer is arranged on the phase-modulation of transmitting terminal part
Between device and the first adjustable attenuator.
Present invention also offers a kind of quantum key distribution method based on continuous light copped wave based on claim 1, bag
Include following steps：
1) laser instrument triggering：Transmitting terminal triggers respectively continuous optical signal laser instrument and synchronously swashs using same clock signal
Light device launches continuous signal light and synchronizable optical, and, used as modulation light, the synchronizable optical is used as synchronizing signal for the continuous signal light
It is transferred to receiving terminal to be responded used by receiving terminal by synchroprobe；
2) continuous signal optical attenuation copped wave：Using continuous light chopping intensity manipulator by the copped wave of continuous signal light be pulse
Light, the repetition rate of the pulsed light is the repetition rate twice of continuous signal light；
3) state modulation is inveigled：By pulsed light by inveigle state intensity modulator carry out random strength modulation, become signal state,
Inveigle the flashlight of state or vacuum state；
4) automatically controlled adjustable attenuator is decayed to flashlight：Flashlight decays light pulse through 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 through the second adjustable attenuator；
5) flashlight and synchronizable optical throughput subchannel transmission：By the different flashlight of wavelength and synchronizable optical in transmitting terminal Jing
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 is hung down through polarization beam apparatus
Straight polarization direction；
7) receiving terminal is interfered：The unequal arm MZ equal with transmitting terminal arm length difference is made using the first polarization-maintaining beam splitter to interfere
Ring, flashlight is divided into two pulses by polarization-maintaining beam splitter, wherein all the way through long-armed, it is long-armed in added with phase-modulator, it is right
Flashlight carries out random phase modulation, and galianconism is not modulated；
8) single-photon detector detection：Single-photon detector detects optical signals, and for subsequent treatment safe key is produced.
Preferably, the step 3) in, carry out random 4 phase-modulation to flashlight, respectively 0, pi/2, π, 3 pi/2s；Step
7) random 2 phase-modulation is carried out to flashlight in, respectively 0, pi/2.
Preferably, the step 7) in also include interfere all the way in addition, using the 3rd polarization-maintaining beam splitter making and transmitting terminal
The equal unequal arm MZ interference rings of arm length difference, flashlight is divided into two pulses by polarization-maintaining beam splitter, wherein all the way through long-armed,
Added with phase-modulator in long-armed, random phase modulation is carried out to flashlight, galianconism is not modulated.
Compared with prior art, the present invention has following beneficial effect：
The quantum key dispatching system of the present invention, by increasing a polarization beam apparatus in receiving terminal, by signal photolysis
For two vertical polarization states, the interference under respective polarization state is completed using polarization maintaining optical fibre interference ring, obtain preferably interfering knot
Really, it is to avoid birefringence effect affects impact of the polarization state to result of interference during fiber-optic transfer, while abandoned correction
System, simplifies the lengthy and jumbled degree of system, also reduces production cost；The form for employing continuous light copped wave in transmitting terminal simultaneously is obtained
The consistent light pulse of two polarization states, eliminates the making of transmitting terminal interference ring, further simplify the lengthy and jumbled degree of system, and drop
Low production cost.
Description of the drawings
Fig. 1 is the theory diagram of quantum key dispatching system of the present invention；
Fig. 2 is the flow chart of quantum key distribution method of the present invention.
In figure：Transmitting terminal 1, transmitting terminal driving plate 101, continuous optical signal laser instrument 102, synchronous laser 103, continuous light
Chopping intensity manipulator 104, inveigles state intensity modulator 105, the first adjustable attenuator 106, the second adjustable attenuator 107 to send out
End wavelength division multiplexer 108 is penetrated, depolarizer 109, receiving terminal 2, receiving terminal driving plate 201, receiving terminal wavelength division multiplexer 202 is synchronous
Detector 203, polarization beam apparatus 204, the first polarization-maintaining beam splitter 205, the second polarization-maintaining beam splitter 206 and single-photon detector
207, the 3rd polarization-maintaining beam splitter 208, the 4th polarization-maintaining beam splitter 209, quantum channel 3, phase regulator 4.
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 to Figure 2, a kind of quantum key dispatching system based on continuous light copped wave, including transmitting terminal 1 and reception
End 2, the transmitting terminal 1 is connected with receiving terminal 2 by quantum channel 3, the transmitting terminal 1 including transmitting terminal driving plate 101, continuously
Optical signal laser instrument 102, synchronous laser 103, continuous light chopping intensity manipulator 104, trick state intensity modulator 105, phase
Position manipulator 4, the first adjustable attenuator 106, the second adjustable attenuator 107 and transmitting terminal wavelength division multiplexer 108, it is described continuous
Optical signal laser instrument 102 is sequentially connected continuous light chopping intensity manipulator 104, inveigles state intensity modulator 105, phase-modulator
4th, the first adjustable attenuator 106 and transmitting terminal wavelength division multiplexer 108, it is adjustable that the synchronous laser 103 is sequentially connected second
Attenuator 107 and transmitting terminal wavelength division multiplexer 108, first adjustable attenuator 106 is connected with the second adjustable attenuator 107
Same one end of transmitting terminal wavelength division multiplexer 108, transmitting terminal driving plate 101 connects respectively continuous optical signal laser instrument 102, synchronously swashs
Light device 103, continuous light chopping intensity manipulator 102, trick state intensity modulator 105, phase-modulator 4, the first adjustable damping
The adjustable attenuator 107 of device 106 and second；The phase regulator 4 of the part of the transmitting terminal 1 and continuous light chopping intensity modulation
Device 104, trick state intensity modulator 105, the first adjustable attenuator 107, the second adjustable attenuator 108 are respectively by simulating control
Holding wire connection transmitting terminal driving plate 101, the continuous optical signal laser instrument 102, synchronous laser 103 are respectively by numeral control
Holding wire connection transmitting terminal driving plate 101 processed；The receiving terminal 2 includes receiving terminal driving plate 201, receiving terminal wavelength division multiplexer
202nd, synchroprobe 203, polarization beam apparatus 204, the first polarization-maintaining beam splitter 205, the second polarization-maintaining beam splitter 206 and single photon
Detector 207, the receiving terminal wavelength division multiplexer 202 connects transmitting terminal wavelength division multiplexer 108 by quantum channel 3, described to connect
The other end of receiving end wavelength division multiplexer 202 connects respectively synchroprobe 203 and polarization beam apparatus 204, the polarization beam apparatus
204 are sequentially connected the first polarization-maintaining beam splitter 205 and the second polarization-maintaining beam splitter 206, and first polarization-maintaining beam splitter 205 passes through respectively
Long-armed polarization maintaining optical fibre and galianconism polarization maintaining optical fibre are connected with the second polarization-maintaining beam splitter 206, are connected with the long-armed polarization maintaining optical fibre
Phase regulator 4, the other end of second polarization-maintaining beam splitter 206 is connected with two-way single-photon detector 207, the receiving terminal
Driving plate 201 connects respectively synchroprobe 203, phase regulator 4 and single-photon detector 207, the part of the receiving terminal 2
Phase regulator 4 receiving terminal driving plate 201 is connected by analog control signal line.In the present embodiment, the quantum channel 3 is
Single-mode fiber, the quantum channel 3 is single-mode fiber, if quantum channel 3 may also be employed polarization maintaining optical fibre apart from need not be long
Transmission, to increase the stability of signal polarization state.The receiving terminal 2 also includes that the 3rd polarization-maintaining beam splitter 208 and the 4th is protected
Inclined beam splitter 209, the polarization beam apparatus 204 are sequentially connected the 3rd polarization-maintaining beam splitter 208 and the 4th polarization-maintaining beam splitter 209,
3rd polarization-maintaining beam splitter 208 is respectively by long-armed polarization maintaining optical fibre and galianconism polarization maintaining optical fibre and the 4th polarization-maintaining beam splitter 209
Connection, is connected with phase regulator 4 in the long-armed polarization maintaining optical fibre, the other end of the 4th polarization-maintaining beam splitter 209 is connected with
Two-way single-photon detector 207, this quantum key dispatching system carries out photon spy using four road single-photon detectors 207 altogether
Survey, wherein, the polarization-maintaining beam splitter 206 of first polarization-maintaining beam splitter 205 and second passes through long-armed polarization maintaining optical fibre with phase regulator 4
And galianconism polarization maintaining optical fibre forms an interference ring, the 3rd polarization-maintaining beam splitter 208 and the 4th polarization-maintaining beam splitter 209 and phase place
Actuator 4 forms an other interference ring by long-armed polarization maintaining optical fibre and galianconism polarization maintaining optical fibre.The transmitting terminal 1 is also included
Depolarizer 109, the depolarizer 109 be arranged on transmitting terminal part the adjustable attenuator 106 of phase-modulator 4 and first it
Between, the degree of polarization of flashlight can be reduced to 0 by the depolarizer 109 so that the polarization state of flashlight is nature light state, effectively
Ensure that the safety of system transfers key.
Present invention also offers a kind of quantum key distribution method based on continuous light copped wave based on claim 1, bag
Include following steps：
1) laser instrument triggering：Transmitting terminal triggers respectively continuous optical signal laser instrument and synchronously swashs using same clock signal
Light device launches continuous signal light and synchronizable optical, and, used as modulation light, the synchronizable optical is used as synchronizing signal for the continuous signal light
It is transferred to receiving terminal to be responded used by receiving terminal by synchroprobe；
2) continuous signal optical attenuation copped wave：Using continuous light chopping intensity manipulator by the copped wave of continuous signal light be pulse
Light, the repetition rate of the pulsed light is the repetition rate twice of continuous signal light；
3) state modulation is inveigled：By pulsed light by inveigle state intensity modulator carry out random strength modulation, become signal state,
Inveigle the flashlight of state or vacuum state；
4) automatically controlled adjustable attenuator is decayed to flashlight：Flashlight decays light pulse through 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 through the second adjustable attenuator；
5) flashlight and synchronizable optical throughput subchannel transmission：By the different flashlight of wavelength and synchronizable optical in transmitting terminal Jing
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 is hung down through polarization beam apparatus
Straight polarization direction；
7) receiving terminal is interfered：The unequal arm MZ equal with transmitting terminal arm length difference is made using the first polarization-maintaining beam splitter to interfere
Ring, flashlight is divided into two pulses by polarization-maintaining beam splitter, wherein all the way through long-armed, it is long-armed in added with phase-modulator, it is right
Flashlight carries out random phase modulation, and galianconism is not modulated；
8) single-photon detector detection：Single-photon detector detects optical signals, and for subsequent treatment safe key is produced.
The step 3) in, carry out random 4 phase-modulation to flashlight, respectively 0, pi/2, π, 3 pi/2s；Step 7) in flashlight is entered
Random 2 phase-modulation of row, respectively 0, pi/2.The step 7) in also include interfere all the way in addition, using the 3rd polarization-maintaining beam splitter
The unequal arm MZ interference ring equal with transmitting terminal arm length difference is made, flashlight is divided into two pulses by polarization-maintaining beam splitter, wherein
All the way through long-armed, it is long-armed in added with phase-modulator, random phase modulation is carried out to flashlight, galianconism is not modulated.
The quantum key dispatching system of the summary present invention understands that the present invention in receiving terminal by increasing with distribution method
One polarization beam apparatus, by flashlight two vertical polarization states are decomposed into, and using polarization maintaining optical fibre interference ring each polarization is completed
Interference under state, obtain preferable result of interference, it is to avoid birefringence effect affects polarization state to dry during fiber-optic transfer
The impact of result is related to, while having abandoned deviation-rectifying system, the lengthy and jumbled degree of system is simplified, production cost is also reduced；Simultaneously in transmitting
End employs the form of continuous light copped wave and obtains two consistent light pulses of polarization state, eliminates the making of transmitting terminal interference ring,
The lengthy and jumbled degree of system is further simplify, and reduces production cost.
Claims (7)
1. a kind of quantum key dispatching system based on continuous light copped wave, it is characterised in that：It is described including transmitting terminal and receiving terminal
Transmitting terminal is connected with receiving terminal by quantum channel, and the transmitting terminal includes transmitting terminal driving plate, continuous optical signal laser instrument, same
Step laser instrument, continuous light chopping intensity manipulator, inveigle state intensity modulator, phase-modulator, the first adjustable attenuator, second
Adjustable attenuator and transmitting terminal wavelength division multiplexer, the continuous optical signal laser instrument is sequentially connected continuous light chopping intensity modulation
Device, trick state intensity modulator, phase-modulator, the first adjustable attenuator and transmitting terminal wavelength division multiplexer, the synchronization swashs
Light device is sequentially connected the second adjustable attenuator and transmitting terminal wavelength division multiplexer, and first adjustable attenuator is adjustable with second to decline
Subtract same one end that device connects transmitting terminal wavelength division multiplexer, transmitting terminal driving plate connects respectively continuous optical signal laser instrument, synchronously swashs
Light device, continuous light chopping intensity manipulator, trick state intensity modulator, phase-modulator, the first adjustable attenuator and second
Adjustable attenuator；
The receiving terminal includes that receiving terminal driving plate, receiving terminal wavelength division multiplexer, synchroprobe, polarization beam apparatus, first protect
Inclined beam splitter, the second polarization-maintaining beam splitter and single-photon detector, the receiving terminal wavelength division multiplexer is connected by quantum channel
Transmitting terminal wavelength division multiplexer, the other end of the receiving terminal wavelength division multiplexer connects respectively synchroprobe and polarization beam apparatus,
The polarization beam apparatus are sequentially connected the first polarization-maintaining beam splitter and the second polarization-maintaining beam splitter, and first polarization-maintaining beam splitter leads to respectively
Cross long-armed polarization maintaining optical fibre and galianconism polarization maintaining optical fibre is connected with the second polarization-maintaining beam splitter, in the long-armed polarization maintaining optical fibre phase is connected with
Position actuator, the other end of second polarization-maintaining beam splitter is connected with two-way single-photon detector, the receiving terminal driving plate point
Lian Jie not synchroprobe, phase regulator and single-photon detector.
2. the quantum key dispatching system of continuous light copped wave is based on as claimed in claim 1, it is characterised in that the quantum letter
Road is single-mode fiber.
3. the quantum key dispatching system of continuous light copped wave is based on as claimed in claim 2, it is characterised in that the receiving terminal
Also include the 3rd polarization-maintaining beam splitter and the 4th polarization-maintaining beam splitter, the polarization beam apparatus be sequentially connected the 3rd polarization-maintaining beam splitter with
And the 4th polarization-maintaining beam splitter, the 3rd polarization-maintaining beam splitter is respectively by long-armed polarization maintaining optical fibre and galianconism polarization maintaining optical fibre and the 4th
Polarization-maintaining beam splitter connects, and phase regulator, the other end of the 4th polarization-maintaining beam splitter are connected with the long-armed polarization maintaining optical fibre
It is connected with two-way single-photon detector.
4. the quantum key dispatching system of continuous light copped wave is based on as claimed in claim 1, it is characterised in that the transmitting terminal
Depolarizer is also included, the depolarizer is arranged between the phase-modulator of transmitting terminal part and the first adjustable attenuator.
5. a kind of quantum key distribution method based on continuous light copped wave based on claim 1, it is characterised in that including following
Step：
1) laser instrument triggering：Transmitting terminal triggers respectively continuous optical signal laser instrument and synchronous laser using same clock signal
Launch continuous signal light and synchronizable optical, used as modulation light, the synchronizable optical is used as synchronous transmission of signal for the continuous signal light
To receiving terminal by used by synchroprobe response is receiving terminal；
2) continuous signal optical attenuation copped wave：Using continuous light chopping intensity manipulator by the copped wave of continuous signal light be pulsed light, should
The repetition rate of pulsed light is the repetition rate twice of continuous signal light；
3) state modulation is inveigled：Pulsed light is carried out into random strength modulation by inveigling state intensity modulator, become signal state, inveigled
The flashlight of state or vacuum state；
4) automatically controlled adjustable attenuator is decayed to flashlight：Light pulse is decayed to list by flashlight through the first adjustable attenuator
Synchronizable optical is adjusted the strength range that can be responded to receiving terminal by photon magnitude, synchronizable optical through the second adjustable attenuator；
5) flashlight and synchronizable optical throughput subchannel transmission：By the different flashlight of wavelength and synchronizable optical in transmitting terminal through 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：The light of asynchronous polarization is decomposed into into horizontal polarization direction through polarization beam apparatus inclined with vertical
Shake direction；
7) receiving terminal is interfered：The unequal arm MZ interference ring equal with transmitting terminal arm length difference, letter are made using the first polarization-maintaining beam splitter
Number light is divided into two pulses by polarization-maintaining beam splitter, wherein all the way through long-armed, it is long-armed in added with phase-modulator, to flashlight
Random phase modulation is carried out, galianconism is not modulated；
8) single-photon detector detection：Single-photon detector detects optical signals, and for subsequent treatment safe key is produced.
6. the quantum key distribution method of continuous light copped wave is based on as claimed in claim 5, it is characterised in that the step 3)
In, carry out random 4 phase-modulation to flashlight, respectively 0, pi/2, π, 3 pi/2s；Step 7) in random 2 phase place is carried out to flashlight
Modulation, respectively 0, pi/2.
7. the quantum key distribution method of continuous light copped wave is based on as claimed in claim 5, it is characterised in that the step 7)
In also include interfering all the way in addition, make equal with transmitting terminal arm length difference unequal arm MZ interference using the 3rd polarization-maintaining beam splitter
Ring, flashlight is divided into two pulses by polarization-maintaining beam splitter, wherein all the way through long-armed, it is long-armed in added with phase-modulator, it is right
Flashlight carries out random phase modulation, and galianconism is not modulated.
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| CN201710134189.7A CN106656494B (en) | 2017-03-08 | 2017-03-08 | Quantum key distribution system and method based on continuous photointerruption |
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| CN201710134189.7A CN106656494B (en) | 2017-03-08 | 2017-03-08 | Quantum key distribution system and method based on continuous photointerruption |
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| CN106850217A (en) * | 2017-04-06 | 2017-06-13 | 山西大学 | One kind realizes one-dimensional modulation continuous variable quantum key delivering method |
| CN108183793A (en) * | 2017-12-25 | 2018-06-19 | 华南师范大学 | A kind of unrelated quantum key distribution system of multi-user's measuring apparatus and method |
| 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 |
| CN109462478A (en) * | 2018-12-29 | 2019-03-12 | 中国科学技术大学 | Quantum key distribution light source based on spontaneous radiation light source |
| 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 |
| 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 |
| 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 |
| CN110351070A (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 Y waveguide |
| CN113037468A (en) * | 2019-12-24 | 2021-06-25 | 山东国迅量子芯科技有限公司 | Monolithic silicon-based integrated chip and quantum key distribution system |
| CN114629563A (en) * | 2022-05-17 | 2022-06-14 | 浙江九州量子信息技术股份有限公司 | Polarization multiplexing quantum key distribution device and full-time full-pass quantum key distribution network |
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| CN110351071B (en) * | 2018-04-02 | 2024-06-21 | 浙江九州量子信息技术股份有限公司 | Quantum key distribution system and method with transmitting end without interference ring |
| CN109462478A (en) * | 2018-12-29 | 2019-03-12 | 中国科学技术大学 | Quantum key distribution light source based on spontaneous radiation light source |
| CN113037468A (en) * | 2019-12-24 | 2021-06-25 | 山东国迅量子芯科技有限公司 | Monolithic silicon-based integrated chip and quantum key distribution system |
| CN114629563A (en) * | 2022-05-17 | 2022-06-14 | 浙江九州量子信息技术股份有限公司 | Polarization multiplexing quantum key distribution device and full-time full-pass quantum key distribution network |
| CN114629563B (en) * | 2022-05-17 | 2022-08-16 | 浙江九州量子信息技术股份有限公司 | Polarization multiplexing quantum key distribution device and full-time full-pass quantum key distribution network |
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