CN105897414A - Continuous variable quantum key distribution system based on Faraday-Michelson interference - Google Patents
Continuous variable quantum key distribution system based on Faraday-Michelson interference Download PDFInfo
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- CN105897414A CN105897414A CN201610362912.2A CN201610362912A CN105897414A CN 105897414 A CN105897414 A CN 105897414A CN 201610362912 A CN201610362912 A CN 201610362912A CN 105897414 A CN105897414 A CN 105897414A
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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
- 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
- H04L9/0819—Key transport or distribution, i.e. key establishment techniques where one party creates or otherwise obtains a secret value, and securely transfers it to the other(s)
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Abstract
The invention discloses a continuous variable quantum key distribution system based on Faraday-Michelson interference. A transmitting end is used for generating a pulse light source which is in accordance with the parameters such as repetition frequency, pulse width and so on, and modulating regular components X and P of a signal light; a communication channel is a light propagation channel, and used for transmitting the signal light modulated by the transmitting end and an unmodulated local oscillation light to a receiving end; a receiving end demodulation module realizes measurement and component selection: X or P; and a receiving end zero-difference detection module is used for performing detection processing, and acquiring modulation information data of a signal. The continuous variable quantum key distribution system based on the Faraday-Michelson interference provided by the invention introduces two unequal-arm Faraday-Michelson interference rings, and with the help of a Faraday polarization rotating mirror, the polarization scrambling in a pulse round trip process can be self-compensated, which is beneficial to improving the stability of the system and not easily interfered by polarization; and besides, long distance stable quantum key distribution can be realized in combination with an existing detection technology and a post-processing algorithm.
Description
Technical field
The present invention relates to a kind of quantum key distribution scheme, concrete, relate to a kind of based on faraday-Michelson interference
Continuous variable quantum key distribution system.
Background technology
After the thought utilizing continuous variable quantum key distribution (CVQKD) to realize quantum communications proposed in 1999,
CVQKD causes the concern of many scholars.Discrete variable quantum key distribution DVQKD ripe relative to research now.CVQKD
Having broken away from single-photon source and the constraint of the low detection efficient of 1550nm wave band, it uses the high light suitable with classical light intensity to communicate,
And use the zero-difference detection device of technology maturation in traditional communication to measure, make higher key production rate and melt with conventional optical network
Synthesize in order to possible.
2002, CVQKD agreement based on Gaussian modulation was suggested, subsequently, in the distribution progressive limit of key and limited
In the case of, the Unconditional security of this scheme is proved to the most in succession.CVQKD scheme based on Gaussian modulation progress into experiment and
Practicalization.
At present, CVQKD can realize key production rate 1Mbps, is sacrificing on the premise of key production rate, communicate away from
From the breakthrough also achieving 100Km.But, the most domestic or external CVQKD scheme, it is all based on double unequal arm arm M-Z
Scheme, in this scheme, due to flashlight and pulsed light through Mach-once the dissimilar arm of interferometer, the interference of suffered polarization can not
Can be completely the same, and when experiencing long-range quantum channel, this polarization drift can be aggravated under environmental disturbances, thus directly affect spy
Survey the interference stability of end.Therefore this type of key distribution system poor anti jamming capability, stability can not keep, and then make CVQKD
Safety also cannot ensure.
Summary of the invention
It is an object of the invention to for above-mentioned the deficiencies in the prior art, it is provided that a kind of based on faraday-Michelson interference
Continuous variable quantum key distribution system, present system can overcome in continuous variable quantum key distribution scheme due to polarization drift
Move the problem causing key distribution system unstable.
For realizing above-mentioned technical purpose, the technical scheme that the present invention takes is: continuous based on faraday-Michelson interference
Variable quantum key distribution system, including transmitting terminal, communication channel and receiving terminal；The outfan of transmitting terminal connects communication channel
Input, the outfan of communication channel connects the input of receiving terminal；It is characterized in that:
Described transmitting terminal includes light source module and modulation module, and the outfan of light source module connects the input of modulation module
End；Described light source module includes continuous wave laser Laser, amplitude modulaor AM1 and the isolator ISO being sequentially connected with；Swash continuously
Light device Laser is for producing the continuous laser of required wavelength, and amplitude modulaor AM1 is for exporting optical parameter to laser instrument Laser
Regulate and control；The input of the output soft exchange isolator ISO of amplitude modulaor AM1；The other end of isolator ISO accesses to be adjusted
Molding block；Described modulation module is F-M ring modulation module；Described F-M ring modulation module includes 2*2 beam splitter BS1, faraday's rotation
Mirror FM1, faraday rotating mirror FM2, phase-modulator PM1, amplitude modulaor AM1；2*2 beam splitter BS1 has four beam splitting arms, respectively
It is beam splitting arm B1, beam splitting arm B2, beam splitting arm B3 and beam splitting arm B4；Beam splitting arm B3 and beam splitting arm B4 brachium；Four beam splitting arms
Front end respectively corresponding four ports, respectively port BS11, port BS12, port BS13, port BS14；Port BS11 connects
Isolator ISO, port BS12 connect communication channel；The port connecting light source module is incidence end, connects the port of communication channel
For exit end；Port BS13 connects faraday rotating mirror FM1, port BS14 and connects faraday rotating mirror FM2；The company that light source module produces
Continuous laser enters 2*2 beam splitter BS1 through incidence end, forms local oscillator light and flashlight, local oscillator after 2*2 beam splitter BS1 beam splitting
Light entry port BS13, flashlight entry port BS14；Local oscillator light and flashlight revolve through faraday rotating mirror FM1 and faraday respectively
Enter 2*2 beam splitter BS1 after mirror FM2 reflection and couple；Faraday rotating mirror FM1 and faraday rotating mirror FM2 is 90 degree of rotations
Turn faraday's reflecting mirror, be used for making reflection light polarization direction relative to incident illumination 90-degree rotation；Local oscillator light and the reflection of flashlight
Light is entry port BS11 and port BS12 after beam splitter BS1 couples；Wherein the reflection light of entry port BS11 is by light source module
Isolator ISO loses, the reflection soft exchange communication channel of entry port BS12；
Communication channel is light propagation ducts, for by transmitting terminal modulate flashlight and unmodulated local oscillator optical transport to connecing
Receiving end；
Described receiving terminal includes demodulation module and zero-difference detection module；Demodulation module is demodulation F-M ring module, demodulates F-M
Ring module comprises circulator CIR2,2*2 unequal arm beam splitter BS3, faraday rotating mirror FM3, faraday rotating mirror FM4 and phase-modulation
Device PM2；The C21 port communication channel of circulator CIR2 is connected, and C22 port is connected with BS3, and C23 port connects zero-difference detection group
Part；Beam splitter BS3 splitting ratio is 50:50；Beam splitter BS3 is 2*2 beam splitter, has four beam splitting arms, is beam splitting arm B5 respectively, divides
Bundle arm B6, beam splitting arm B7 and beam splitting arm B8；The front end of four beam splitting arms correspondence respectively four ports, respectively ports respectively
BS31, port BS32, port BS33, port BS34；Port BS31 connects communication channel, and port BS32 connects photodetector
PIN4, port BS33 connect faraday rotating mirror FM3, port BS34 and connect faraday rotating mirror FM4；Beam splitting arm B7's and beam splitting arm B8
Arm length difference is equal, i.e. with beam splitting arm B3 and beam splitting arm B4 arm length difference | lB7-lB8|=| lB3-lB4|；Port BS31 connects circulator
The port C22 of CIR2, by the port C22 of the reflection light input circulator CIR2 of faraday rotating mirror FM3 and faraday rotating mirror FM4,
Then the port C23 through circulator CIR2 is input to photodetector PIN3；Described zero-difference detection module comprises photodetector
PIN3 and photodetector PIN4 and process circuit；Zero-difference detection module is for photodetector PIN3 and photodetector
The result of PIN4 does difference process, to obtain modulated signal information data.
As further improved technical scheme of the present invention, definition pulse strength the higher person is local oscillator light, and pulse strength is relatively
Low for flashlight, and ensure flashlight place beam splitting arm B4 be beam splitting arm B3, shorter arm in beam splitting arm B4；Described pulse is for passing through
2*2 beam splitter BS1 beam splitting, the reflection of faraday's rotating mirror also close the pulse restrainted at 2*2 beam splitter BS1.
As further improved technical scheme of the present invention, the phase-modulator PM1 of modulation module is placed in and is demarcated as signal
On the beam splitting arm B4 at light place or be placed on the beam splitting arm B2 after closing bundle, described phase-modulator PM1 is for flashlight
Carry out phase-modulation；Local oscillator light is not done any modulation, directly through port BS12 access communications channel.
As further improved technical scheme of the present invention, connecting and have amplitude modulaor AM2 on beam splitting arm B2, amplitude is adjusted
Device AM2 processed is for being modulated the amplitude of flashlight.
As further improved technical scheme of the present invention, the modulation numerical value of amplitude modulaor AM2 and phase-modulator PM1 by
Canonical component X, P of flashlight calculates gained, Modulation and Amplitude Modulation valuePhase modulation valuesX
With P Gaussian distributed.
As further improved technical scheme of the present invention, modulation module also includes being placed on beam splitting arm B3 or beam splitting arm
Adjustable delay line DL1 on B4, adjustable delay line DL1 are for regulating flashlight and the relative time-delay of local oscillator light.
As further improved technical scheme of the present invention, the beam splitting arm B4 at the flashlight place of transmitting terminal places one
Beam splitter BS2 and an adjustable attenuator VOA combination, for realizing the detection to signal light power and control.
As further improved technical scheme of the present invention, transmitting terminal also comprises a circulator CIR1, circulator CIR1's
Port C12 connects communication channel, and port C11 connectivity port BS12, port C13 connect photodetector, are used for detecting virus and attack
Hit.
As further improved technical scheme of the present invention, communication channel is fiber waveguide medium, free space, separation optics
Element, fiber optic components or any two and combination of the above in them；
As further improved technical scheme of the present invention, receiving terminal faraday reflecting mirror FM3, FM4 and transmitting terminal farad
Reflecting mirror FM1, FM2 feature is identical.
As further improved technical scheme of the present invention, described circulator CIR2 and transmitting terminal circulator CIR1 feature phase
With, input light from C21 port, export from C22 port, input light from C22 port, export from C23 port；Input from C11 port
Light, exports from C12 port, inputs light from C12 port, exports from C13 port.
As further improved technical scheme of the present invention, the demodulation module of receiving terminal also comprises a variable delay line DL2,
Described DL2 may be provided at beam splitting arm B7, B8 arbitrary on, with variable delay line DL1 collaborative work, make BS3 beam splitting for regulation
The arm length difference of arm B7, B8 is equal with BS1 beam splitting arm B3, B4 arm length difference, and then makes to walk long-armed, galianconism respectively at transmitting, receiving terminal
Local oscillator light and walk galianconism respectively, long-armed flashlight arrives bundling device BS3 simultaneously, it is achieved interfere.
As further improved technical scheme of the present invention, the phase-modulator PM2 of receiving terminal is placed in beam splitting arm B7, B8
Relatively on galianconism, and only local oscillator light is done phase-modulation.
As further improved technical scheme of the present invention, described receiving terminal phase-modulator PM2 is random according to binary system
Number, Stochastic Modulation is 0 ° or 90 °, it is achieved measures and selects base effect.
This is based on faraday-Michelson interference continuous variable quantum key distribution system workflow:
1, after selecting the narrow linewidth laser that wavelength meets, through amplitude modulaor AM1 to the output repetition rate of light, arteries and veins
Wide, amplitude is modulated, and gained pulsed light is connected into 2*2 beam splitter through isolator ISO is unidirectional.
2, light source output light is divided into two bundles after beam splitter BS1, is referred to as local oscillator light and flashlight, respectively enters point
Bundle device port BS13, port BS14.Usually, the local oscillator light (about 10^8 photon/pulse) making intensity higher is selected to pass through beam splitting
Arm longer in arm B3, beam splitting arm B4, the more weak flashlight of intensity is by arm shorter in beam splitting arm B3, beam splitting arm B4.
3, reflecting through faraday rotating mirror FM1 and faraday rotating mirror FM2, all there are 90 ° of deflections in two-beam polarization, came and went
Journey polarization affects self compensation.
4, the local oscillator light through the faraday rotating mirror FM1 reflection of the port BS13 of beam splitter BS1 is not modulated, directly through beam splitting
The port BS12 of device BS1 is coupled into communication channel.
5, transmitting terminal is according to preparing modulated random number, by the phase-modulator PM 1 of port BS4 and shaking of port BS12
Regular position X or canonical momentum P of the light field of flashlight light field are modulated by width manipulator AM 1.
6, rely on beam splitting arm B3, beam splitting arm B4 unequal arm length and adjustable delay line DL 1, make local oscillator light and flashlight pass
Relative delay is had in defeated time domain.
7, local oscillator light and flashlight enter communication channel by time-division multiplex technology through port BS12.
8, flashlight and local oscillator light arrive receiving terminal, are split through 3dB beam splitter BS3, enter and transmitting terminal is symmetrical
Unequal arm F-M ring, the arm length difference of the F-M ring modulation module of transmitting terminal and the unequal arm F-M ring of receiving terminal is equal.
9, after the faraday rotating mirror FM3 on unequal arm F-M ring and faraday rotating mirror FM4 reflects, part signal light and basis
The time delay of light of shaking is compensated.Long-armed and galianconism local oscillator light and transmitting, receiving terminal difference is walked respectively with receiving terminal launching
Walk galianconism, long-armed flashlight by arriving beam splitter BS3 simultaneously, interfere.
10, on the arm of receiving terminal local oscillator light place, phase-modulator PM2 is installed, selects phase modulation 0 by random binary number
Or 90 °, and then realize measuring base X-component or the selection measurement of P component.
11, flashlight and local oscillator light are interfered at 3dB beam splitter (i.e. beam splitter BS3) place, enter zero-difference detection module.Through zero
Difference detection, receiving terminal obtains a string value of symbol associated with transmitting terminal, and symbol wound, through quantification treatment, is converted into two and enters by the two
Code processed, and then carry out Data Post, finally obtain safe binary keys.
The invention mainly comprises be positioned at transmitting terminal light source module, modulation F-M ring module, communication channel, be positioned at receiving terminal
Demodulation F-M ring module, zero-difference detection module；The present invention relies on the optically-active characteristic of faraday mirror so that light is in incident and reflection
The polarization scrambling being subject in light path compensates automatically, it is achieved stable quantity quantum key distribution.Research direction about CVQKD is concentrated at present
For improving detector detection efficient and the upgrading of algorithm, the present invention proposes innovation from key distribution device, and the present invention can be in conjunction with
Above-mentioned detection and data post-processing technology use, and make CVQKD system stability, the transmission of quantum key of safety.Invention introduces
Two unequal arm faraday-Michelson interference rings, by Faraday po-larization revolving mirror, make polarization scrambling in pulse two-way process
Obtain self compensation, the stability of beneficially raising system, it is susceptible to polarization interference；Can be in conjunction with existing Detection Techniques and post processing
Algorithm, it is achieved distance stable quantity quantum key distribution.In a word, the present invention proposes a kind of new type of continuous variable quantum-key distribution
Scheme, the stability of beneficially raising system, it is susceptible to polarization interference；Can in conjunction with existing Detection Techniques and post-processing algorithm,
Realize distance stable quantity quantum key distribution.
Accompanying drawing explanation
Fig. 1 is the system structure schematic diagram of the present invention；
Fig. 2 is the CVQKD implementation principle schematic of the present invention.
Detailed description of the invention
Embodiment 1
Seeing Fig. 1 and Fig. 2, this is based on faraday-Michelson interference continuous variable quantum key distribution system, including sending out
Penetrate end, communication channel and receiving terminal；The outfan of transmitting terminal connects the input of communication channel, and the outfan of communication channel connects
The input of receiving terminal.
Transmitting terminal includes light source module and modulation module, and the outfan of light source module connects the input of modulation module；Light
Source module includes continuous wave laser Laser, amplitude modulaor AM1 and the isolator ISO being sequentially connected with；Continuous wave laser Laser
For producing the continuous laser of required wavelength, amplitude modulaor AM1 is for regulating and controlling laser instrument Laser output optical parameter；
The input of the output soft exchange isolator ISO of amplitude modulaor AM1；The other end of isolator ISO accesses modulation module；
Modulation module is F-M ring modulation module；F-M ring modulation module include 2*2 beam splitter BS1, faraday rotating mirror FM1,
Faraday rotating mirror FM2 and phase-modulator PM1；2*2 beam splitter BS1 has four beam splitting arms, is beam splitting arm B1, beam splitting arm respectively
B2, beam splitting arm B3 and beam splitting arm B4；Beam splitting arm B3 and beam splitting arm B4 brachium；The most corresponding four of the front end of four beam splitting arms
Port, respectively port BS11, port BS12, port BS13, port BS14；Port BS11 connects isolator ISO, port BS12
Connect communication channel；The port connecting light source module is incidence end, and the port connecting communication channel is exit end；Port BS13 is even
Meet faraday rotating mirror FM1, port BS14 and connect faraday rotating mirror FM2；The continuous laser that light source module produces enters through incidence end
2*2 beam splitter BS1, forms local oscillator light and flashlight, local oscillator light entry port BS13, signal after 2*2 beam splitter BS1 beam splitting
Light entry port BS14；Local oscillator light and flashlight enter 2*2 respectively after faraday rotating mirror FM1 and faraday rotating mirror FM2 reflects
Beam splitter BS1 also couples；Faraday rotating mirror FM1 and faraday rotating mirror FM2 is 90 degree of faraday's reflecting mirrors, is used for making instead
Penetrate light polarization direction relative to incident illumination 90-degree rotation；The reflection light of local oscillator light and local oscillator light enters after beam splitter BS1 couples
Port BS11 and port BS12；Wherein the reflection light of entry port BS11 is lost by light source module isolator, entry port
The reflection soft exchange communication channel of BS12；
Through BS1 beam splitting, FM reflection the pulse closing bundle at BS1, definition intensity the higher person is local oscillator light, and intensity is relatively low
For flashlight, and ensure that beam splitting arm B4 in flashlight place is shorter arm in B3, B4.
The phase-modulator PM1 of modulation module is placed in after being demarcated as on the beam splitting arm B4 at flashlight place or be placed in conjunction bundle
Beam splitting arm B2 on, described phase-modulator PM1 is for carrying out phase-modulation to flashlight；Local oscillator light is not done any tune
System, directly through port BS12 access communications channel.
Beam splitting arm B2 connects and has amplitude modulaor AM2, amplitude modulaor AM2 for the amplitude of flashlight is adjusted
System.
The modulation numerical value of amplitude modulaor AM2 and phase-modulator PM1 is calculated gained by canonical component X, P of flashlight,
Modulation and Amplitude Modulation valuePhase modulation valuesUsually, X and P Gaussian distributed.
Modulation module also includes the adjustable delay line DL1 being placed on beam splitting arm B3 or beam splitting arm B4, adjustable delay line
DL1 is for regulating flashlight and the relative time-delay of local oscillator light.
A beam splitter BS2 and an adjustable attenuator VOA group is placed on the beam splitting arm B4 at the flashlight place of transmitting terminal
Close, for realizing the detection to signal light power and control.
Transmitting terminal system also comprises a circulator CIR1, and the port C12 of circulator CIR1 connects communication channel, port C11
Connectivity port BS12, port C13 connect photodetector, are used for detecting Trojan Horse etc. and attack.
Described communication channel is light propagation ducts, for the flashlight modulated by transmitting terminal and unmodulated local oscillator optical transport
To receiving terminal, can be fiber waveguide medium, free space, separate optical element, fiber optic components or they in arbitrarily
Two and combination of the above；
Receiving terminal includes demodulation module and zero-difference detection module；Demodulation module is demodulation F-M ring module, demodulates F-M ring mould
Block comprises circulator CIR2,2*2 unequal arm beam splitter BS, faraday rotating mirror FM3, faraday rotating mirror FM4 and phase-modulator
PM2；The C21 port communication channel of circulator CIR2 is connected, and C22 port is connected with BS3, and C23 port connects zero-difference detection assembly.
The beam splitter BS3 that unequal arm F-M ring uses splitting ratio to be 50:50；Beam splitter BS3 is 2*2 beam splitter, has four beam splitting arms, point
It not beam splitting arm B5, beam splitting arm B6, beam splitting arm B7 and beam splitting arm B8；The front end of four beam splitting arms four ends respectively of correspondence respectively
Mouthful, respectively port BS31, port BS32, port BS33, port BS34；Port BS31 connects communication channel, and port BS32 is even
Meet photodetector PIN4, port BS33 and connect faraday rotating mirror FM3, port BS34 connection faraday rotating mirror FM4；Beam splitting arm B7
Equal, i.e. with beam splitting arm B3 and beam splitting arm B4 arm length difference with the arm length difference of beam splitting arm B8 | lB7-lB8|=| lB3-lB4|；Port BS31
Connect the port C22 of circulator CIR2, the reflection light of faraday rotating mirror FM3 and faraday rotating mirror FM4 is inputted circulator CIR2
Port C22, then the port C23 through circulator CIR2 is input to photodetector PIN3；Described zero-difference detection module comprises
Photodetector PIN3 and photodetector PIN4 and process circuit；Zero-difference detection module for photodetector PIN3 and
The result of photodetector PIN4 does difference process, to obtain modulated signal information data.
Receiving terminal faraday reflecting mirror FM3 with FM4 is identical with transmitting terminal FM1, FM2 feature.Circulator CIR2 and transmitting terminal
Circulator CIR1 feature is identical, inputs light from C21 (C11) port, exports from C22 (C12) port, inputs from C22 (C12) port
Light, exports from C23 (C13) port.
The demodulation module of receiving terminal also comprises a variable delay line DL2, and it is arbitrary that described DL2 may be provided at beam splitting arm B7, B8
On, with DL1 collaborative work, make arm length difference and BS1 beam splitting arm B3, B4 arm length difference phase of BS3 beam splitting arm B7, B8 for regulation
Deng, so make launch, receiving terminal walk respectively long-armed, the local oscillator light of galianconism and walk galianconism respectively, long-armed flashlight arrives simultaneously
Reach bundling device BS3, it is achieved interfere.
The phase-modulator PM2 of receiving terminal should be placed in B7, B8 relatively on galianconism, and local oscillator light only does phase place adjust
System.Phase-modulator PM2 is according to binary system random number, and Stochastic Modulation is 0 ° or 90 °, it is achieved measures and selects base effect.
By zero-difference detection, receiving terminal will obtain a string value of symbol associated with transmitting terminal, and the two is through quantification treatment, will
Symbol wound is converted into binary code, and then carries out Data Post, finally obtains safe binary keys.
Claims (14)
1. based on faraday-Michelson interference continuous variable quantum key distribution system, including transmitting terminal, communication channel
And receiving terminal；The outfan of transmitting terminal connects the input of communication channel, and the outfan of communication channel connects the input of receiving terminal
End；It is characterized in that:
Described transmitting terminal includes light source module and modulation module, and the outfan of light source module connects the input of modulation module；Institute
State continuous wave laser Laser, amplitude modulaor AM1 and isolator ISO that light source module includes being sequentially connected with；Continuous wave laser
Laser is for producing the continuous laser of required wavelength, and amplitude modulaor AM1 is for carrying out laser instrument Laser output optical parameter
Regulation and control；The input of the output soft exchange isolator ISO of amplitude modulaor AM1；The other end of isolator ISO accesses modulation mould
Block；Described modulation module is F-M ring modulation module；Described F-M ring modulation module includes 2*2 beam splitter BS1, faraday's rotating mirror
FM1, faraday rotating mirror FM2, phase-modulator PM1, amplitude modulaor AM1；2*2 beam splitter BS1 has four beam splitting arms, is respectively
Beam splitting arm B1, beam splitting arm B2, beam splitting arm B3 and beam splitting arm B4；Beam splitting arm B3 and beam splitting arm B4 brachium；Four beam splitting arms
The most corresponding four ports in front end, respectively port BS11, port BS12, port BS13, port BS14；Port BS11 connect every
Communication channel is connected from device ISO, port BS12；The port connecting light source module is incidence end, and the port connecting communication channel is
Exit end；Port BS13 connects faraday rotating mirror FM1, port BS14 and connects faraday rotating mirror FM2；It is continuous that light source module produces
Laser enters 2*2 beam splitter BS1 through incidence end, forms local oscillator light and flashlight, local oscillator light after 2*2 beam splitter BS1 beam splitting
Entry port BS13, flashlight entry port BS14；Local oscillator light and flashlight are respectively through faraday rotating mirror FM1 and faraday's rotating mirror
Enter 2*2 beam splitter BS1 after FM2 reflection and couple；Faraday rotating mirror FM1 and faraday rotating mirror FM2 is 90 degree of rotations
Faraday's reflecting mirror, is used for making reflection light polarization direction relative to incident illumination 90-degree rotation；The reflection light of local oscillator light and flashlight
Entry port BS11 and port BS12 after beam splitter BS1 couples；Wherein the reflection light of entry port BS11 by light source module every
Lose from device ISO, the reflection soft exchange communication channel of entry port BS12；
Communication channel is light propagation ducts, for by transmitting terminal modulate flashlight and unmodulated local oscillator optical transport to reception
End；
Described receiving terminal includes demodulation module and zero-difference detection module；Demodulation module is demodulation F-M ring module, demodulates F-M ring mould
Block comprises circulator CIR2,2*2 unequal arm beam splitter BS3, faraday rotating mirror FM3, faraday rotating mirror FM4 and phase-modulator
PM2；The C21 port communication channel of circulator CIR2 is connected, and C22 port is connected with BS3, and C23 port connects zero-difference detection assembly；
Beam splitter BS3 splitting ratio is 50:50；Beam splitter BS3 is 2*2 beam splitter, has four beam splitting arms, is beam splitting arm B5, beam splitting respectively
Arm B6, beam splitting arm B7 and beam splitting arm B8；The front end of four beam splitting arms four ports respectively of correspondence respectively, respectively port BS31,
Port BS32, port BS33, port BS34；Port BS31 connects communication channel, and port BS32 connects photodetector PIN4, end
Mouth BS33 connects faraday rotating mirror FM3, port BS34 and connects faraday rotating mirror FM4；Beam splitting arm B7 and the arm length difference of beam splitting arm B8
Equal, i.e. with beam splitting arm B3 and beam splitting arm B4 arm length difference | lB7-lB8|=| lB3-lB4|；Port BS31 connects the end of circulator CIR2
Mouth C22, by the port C22 of the reflection light input circulator CIR2 of faraday rotating mirror FM3 and faraday rotating mirror FM4, then through ring
The port C23 of shape device CIR2 is input to photodetector PIN3；Described zero-difference detection module comprises photodetector PIN3 and light
Electric explorer PIN4 and process circuit；Zero-difference detection module is for photodetector PIN3 and the knot of photodetector PIN4
Fruit is cooked difference process, to obtain modulated signal information data.
The most according to claim 1 based on faraday-Michelson interference continuous variable quantum key distribution system, it is special
Levy and be: definition pulse strength the higher person is local oscillator light, and pulse strength is relatively low for flashlight, and ensures flashlight place beam splitting arm
B4 is beam splitting arm B3, shorter arm in beam splitting arm B4；Described pulse is to reflect also through 2*2 beam splitter BS1 beam splitting, faraday's rotating mirror
The pulse of bundle is closed at 2*2 beam splitter BS1.
The most according to claim 1 based on faraday-Michelson interference continuous variable quantum key distribution system, it is special
Levy and be: the phase-modulator PM1 of modulation module is placed in after being demarcated as on the beam splitting arm B4 at flashlight place or be placed in conjunction bundle
Beam splitting arm B2 on, described phase-modulator PM1 is for carrying out phase-modulation to flashlight；Local oscillator light is not done any tune
System, directly through port BS12 access communications channel.
The most according to claim 3 based on faraday-Michelson interference continuous variable quantum key distribution system, it is special
Levy and be: connect on beam splitting arm B2 and have amplitude modulaor AM2, amplitude modulaor AM2 for the amplitude of flashlight is adjusted
System.
The most according to claim 4 based on faraday-Michelson interference continuous variable quantum key distribution system, it is special
Levy and be: the modulation numerical value of amplitude modulaor AM2 and phase-modulator PM1 is calculated gained by canonical component X, P of flashlight, shakes
Width modulation valuePhase modulation valuesX and P Gaussian distributed.
The most according to claim 1 based on faraday-Michelson interference continuous variable quantum key distribution system, it is special
Levy and be: modulation module also includes the adjustable delay line DL1 being placed on beam splitting arm B3 or beam splitting arm B4, adjustable delay line
DL1 is for regulating flashlight and the relative time-delay of local oscillator light.
The most according to claim 5 based on faraday-Michelson interference continuous variable quantum key distribution system, it is special
Levy and be: on the beam splitting arm B4 at the flashlight place of transmitting terminal, place a beam splitter BS2 and an adjustable attenuator VOA group
Close, for realizing the detection to signal light power and control.
The most according to claim 2 based on faraday-Michelson interference continuous variable quantum key distribution system, it is special
Levying and be: transmitting terminal also comprises a circulator CIR1, the port C12 of circulator CIR1 connects communication channel, and port C11 connects end
Mouth BS12, port C13 connect photodetector, are used for detecting virus attack.
The most according to claim 1 based on faraday-Michelson interference continuous variable quantum key distribution system, it is special
Levy and be: communication channel be fiber waveguide medium, free space, separate optical element, fiber optic components or they in appoint
Anticipate two and combination of the above.
The most according to claim 1 based on faraday-Michelson interference continuous variable quantum key distribution system, its
It is characterised by: receiving terminal faraday reflecting mirror FM3, FM4 are identical with transmitting terminal faraday's reflecting mirror FM1, FM2 feature.
11. is according to claim 1 based on faraday-Michelson interference continuous variable quantum key distribution system, its
It is characterised by: described circulator CIR2 is identical with transmitting terminal circulator CIR1 feature, inputs light from C21 port, defeated from C22 port
Go out, input light from C22 port, export from C23 port；Input light from C11 port, export from C12 port, input from C12 port
Light, exports from C13 port.
12. is according to claim 1 based on faraday-Michelson interference continuous variable quantum key distribution system, its
Being characterised by: the demodulation module of receiving terminal also comprises a variable delay line DL2, it is arbitrary that described DL2 may be provided at beam splitting arm B7, B8
On, with variable delay line DL1 collaborative work, make arm length difference and BS1 beam splitting arm B3, B4 of BS3 beam splitting arm B7, B8 for regulation
Arm length difference is equal, and then makes walk long-armed, the local oscillator light of galianconism respectively at transmitting, receiving terminal and walk galianconism, long-armed signal respectively
Light arrives bundling device BS3 simultaneously, it is achieved interfere.
13. is according to claim 1 based on faraday-Michelson interference continuous variable quantum key distribution system, its
It is characterised by: the phase-modulator PM2 of receiving terminal is placed in beam splitting arm B7, B8 relatively on galianconism, and only local oscillator light is done phase
Position modulation.
14. is according to claim 11 based on faraday-Michelson interference continuous variable quantum key distribution system, its
It is characterised by: described receiving terminal phase-modulator PM2 is according to binary system random number, and Stochastic Modulation is 0 ° or 90 °, it is achieved measure choosing
Base effect.
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