CN109039475A - Continuous variable quantum key delivering method and system based on free space - Google Patents
Continuous variable quantum key delivering method and system based on free space Download PDFInfo
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- CN109039475A CN109039475A CN201810759058.2A CN201810759058A CN109039475A CN 109039475 A CN109039475 A CN 109039475A CN 201810759058 A CN201810759058 A CN 201810759058A CN 109039475 A CN109039475 A CN 109039475A
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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
Abstract
The present invention provides a kind of continuous variable quantum key delivering method and system based on free space, comprising: issue laser, and copped wave, light-splitting processing are carried out to laser, construct local oscillation signal and quantum signal；Generate one group of rayleigh distributed and equally distributed random number；The quantum signal constructed is modulated using the rayleigh distributed and equally distributed random number of generation；Modulated quantum signal is coupled in free space with local oscillation signal and is transmitted.The present invention allows signal light and local oscillator light to transmit by being coupled into free space, finally it is coupled in optical fiber and is detected, the influence of noise that background natural light introduces local oscillator light and signal light can not only be effectively reduced, also breach its limitation to decay in a fiber, and great amount of cost can be saved, to realize that trans-regional long range quantum cryptography communication opens new approach.
Description
Technical field
The present invention relates to fields of communication technology, and in particular, to the continuous variable quantum key distribution based on free space
Method and system.
Background technique
In the epoch of nowadays rapid technological growth, particularly with 5G communication, artificial intelligence, Internet of Things, big
The fast development of the technologies such as data, the quick flowing of information is so that the safety of information becomes coke concerned by people
Point.In recent decades, as quantum mechanics and quantum information theory combine the quantum cryptology to grow up fast-developing, so that protecting
The Unconditional security of shield information is possibly realized.Quantum key distribution technology is the important application of quantum cryptology, so that legal
Communicating pair finally shares the consistent key being perfectly safe.Quantum key distribution can make legitimate correspondence both sides fly-by-night
Secure shared key in quantum channel mainly realizes the nothing of communication using uncertainty principle and the unclonable theorem of quantum state
Condition safety.
Quantum key distribution can be divided into discrete variable quantum key distribution and continuous variable quantum key distribution.With discrete change
It is different to measure quantum key distribution, in continuous variable quantum key distribution agreement, transmitting terminal utilizes Gaussian modulation by information tune
For system on the canonical component of light field, recipient can utilize efficient homodyne detection or heterodyne Detection and Extraction key information.Because
It has been proved under extreme conditions, the attack that is concerned with is consistent with the ability that collective attacks, so continuous variable quantum key distribution
System can resist any collective's attack and relevant attack.In addition to this under the conditions of distribution key is limited, Gaussian modulation is relevant
State continuous variable quantum key distribution scheme has been proved to possess Unconditional security, can resist the attack of relevant and collective.By
Monochromatic light component source and single photon detector are not needed in continuous variable quantum key distribution system, and continuous modulation has bigger letter
Road capacity, and system and traditional optical signal have preferable amalgamation, therefore continuous variable quantum key distribution is with very big
Advantages for development.
Compared with the quantum key distribution in optical fiber, the quantum key distribution mode in free space has its unique excellent
Gesture, for example specific transmission medium is not needed, there is the convenience of radio communication, photon spread is not by birefringent effect in atmosphere
The influence answered, interchannel noise is smaller, and atmospheric density reduces when height increases, and photon transmission loss strongly reduces.Therefore, it is expected to benefit
Ground satellite station and intersatellite quantum key distribution are completed with free-space quantum key distribution technology, then building is based on amount
The global safety communication network of quantum key distribution has good development prospect.
But there is also problems for current free space continuous variable quantum key transmission.There are many influence factor in atmosphere,
Such as the flowing of air, scattering, weather etc., synchronous with signal light there are also local oscillator light for signal itself, phase is inclined
It moves, different delay, decaying and dispersion, refraction and reflection energy consumption etc., above many reasons make the continuous variable of free space
Quantum key transmission never makes substantial progress.Therefore the good characteristic of optical fiber is still utilized in many research teams, leads to
Cross optical fiber transmission of quantum signal and local oscillation signal.But when transmission range is longer, establish optical cable, base station amplification cost will be very
Height, and the maintenance of optical fiber is not easy to.
Summary of the invention
For the defects in the prior art, the object of the present invention is to provide a kind of continuous variable quantum based on free space
Cryptographic key distribution method and system.
A kind of continuous variable quantum key delivering method based on free space provided according to the present invention, comprising:
Signal constitution step: laser is issued, and copped wave, light-splitting processing are carried out to laser, constructs local oscillation signal and quantum letter
Number；
Random number generates step: generating one group of rayleigh distributed and equally distributed random number；
Modulation step: the quantum signal constructed is adjusted using the rayleigh distributed and equally distributed random number of generation
System；
Coupling step: modulated quantum signal is coupled in free space with local oscillation signal and is transmitted.
Preferably, the signal constitution step includes:
Laser is generated using laser, copped wave is carried out to laser using modulator, and control bias point electricity by feeding back
Pressure is to stablize output laser pulse signal；
Laser pulse signal is divided into two-way, wherein being all the way low light signals, another way is strong optical signal, low light signals warp
Quantum signal is used as after decaying, strong optical signal is as local oscillation signal.
Preferably, the random number generation step includes:
Binary random number x is generated by tandom number generator, random number 2Nbit is divided into one group, and N is natural number,
Every group of 2N random number is handled, every Nbit is mapped as the equally distributed random number in the section 0-1, is generated with this
Equally distributed random number x；
Pass throughFormula generates the random number y of Ruili distribution.
Preferably, the modulation step includes:
The random number of rayleigh distributed is modulated in the amplitude of quantum signal, equally distributed random number is modulated at quantum
In the phase of signal.
Preferably, the coupling step includes:
Modulated quantum signal and local oscillation signal are passed through into one starting of free space channel by time-division and palarization multiplexing
Receiving end is given, receiving end carries out polarization compensation by time-division and the demultiplexing of polarization, and to the signal received, finally utilizes zero
The regular position for the signal that difference detector random measurement receives or the value of canonical momentum.
A kind of continuous variable quantum key distribution system based on free space provided according to the present invention, comprising:
Signal constructing module: laser is issued, and copped wave, light-splitting processing are carried out to laser, constructs local oscillation signal and quantum letter
Number；
Random-number-generating module: one group of rayleigh distributed and equally distributed random number are generated；
Modulation module: the quantum signal constructed is adjusted using the rayleigh distributed and equally distributed random number of generation
System；
Coupling module: modulated quantum signal is coupled in free space with local oscillation signal and is transmitted.
Preferably, the signal constructing module includes:
Laser is generated using laser, copped wave is carried out to laser using modulator, and control bias point electricity by feeding back
Pressure is to stablize output laser pulse signal；
Laser pulse signal is divided into two-way, wherein being all the way low light signals, another way is strong optical signal, low light signals warp
Quantum signal is used as after decaying, strong optical signal is as local oscillation signal.
Preferably, the random-number-generating module includes:
Binary random number x is generated by tandom number generator, random number 2Nbit is divided into one group, and N is natural number,
Every group of 2N random number is handled, every Nbit is mapped as the equally distributed random number in the section 0-1, is generated with this
Equally distributed random number x；
Pass throughFormula generates the random number y of Ruili distribution.
Preferably, the modulation module includes:
The random number of rayleigh distributed is modulated in the amplitude of quantum signal, equally distributed random number is modulated at quantum
In the phase of signal.
Preferably, the coupling module includes:
Modulated quantum signal and local oscillation signal are passed through into one starting of free space channel by time-division and palarization multiplexing
Receiving end is given, receiving end carries out polarization compensation by time-division and the demultiplexing of polarization, and to the signal received, finally utilizes zero
The regular position for the signal that difference detector random measurement receives or the value of canonical momentum.
Compared with prior art, the present invention have it is following the utility model has the advantages that
The present invention allows signal light and local oscillator light to transmit by being coupled into free space, is finally coupled in optical fiber and carries out
Detection.Such as use the 1550nm wavelength laser of standard single-mode fiber window, the energy ratio and biography occupied under background natural light
The free space window wavelength of the 500nm-700nm of system can effectively reduce background natural light to local oscillator light and letter compared to very small
The noise pollution of number light, and the coupling of free space to optical fiber is also natively regarded as a kind of filtering, further reduced
Influence of the bias light to quantum signal.In addition, due to the free space continuous variable signal transmission attenuation across atmosphere not with
Trans-regional transmission range and increase (the only fixed attenuation of atmosphere thickness), this method can break through continuous variable quantum
The limitation to decay in a fiber is communicated, so that great amount of cost can be saved, to realize that trans-regional long range quantum cryptography communication is opened up
New approach.
Detailed description of the invention
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other feature of the invention,
Objects and advantages will become more apparent upon:
Fig. 1 is system structure diagram of the invention；
Fig. 2 is the structural schematic diagram of transmitting terminal of the present invention；
Fig. 3 is the structural schematic diagram of receiving end of the present invention；
In figure:
AM indicates High Extinction Ratio intensity modulator；
FM indicates faraday mirror；
PM indicates phase-modulation；
BS indicates beam splitter；
Bias indicates biasing；
VOA indicates attenuator；
PBS indicates polarization beam apparatus；
DPC indicates dynamic polarization control；
DL indicates delay.
Specific embodiment
The present invention is described in detail combined with specific embodiments below.Following embodiment will be helpful to the technology of this field
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill of this field
For personnel, without departing from the inventive concept of the premise, several changes and improvements can also be made.These belong to the present invention
Protection scope.
As shown in Figure 1, a kind of continuous variable quantum key delivering method based on free space provided by the invention, packet
It includes:
Signal constitution step: laser is issued, and copped wave, light-splitting processing are carried out to laser, constructs local oscillation signal and quantum letter
Number；
Random number generates step: generating one group of rayleigh distributed and equally distributed random number；
Modulation step: the quantum signal constructed is adjusted using the rayleigh distributed and equally distributed random number of generation
System；
Coupling step: modulated quantum signal is coupled in free space with local oscillation signal and is transmitted.
Specifically, signal constitution step includes:
Transmitting terminal generates laser using laser, and before this, transmitting terminal and receiving end are needed to continuous variable amount first
Information source, random number source, codec, detector and the control circuit of quantum key distribution system clock are initialized.
Copped wave is carried out to laser using High Extinction Ratio modulator, and controls bias point voltage by feeding back to stablize output
Laser pulse signal.Copped wave is carried out to the laser that laser issues here by the copped wave effect of High Extinction Ratio modulator, is used
Laser pulse signal is generated, the duty ratio of the laser pulse signal after copped wave is generally 10% or so.To stablize High Extinction Ratio
The bias voltage of modulator generates better optical pulse waveform, can reduce two as far as possible used here as High Extinction Ratio modulator
Photon residual between light pulse.
Laser pulse signal is divided into two-way, wherein being all the way low light signals, another way is strong optical signal, low light signals warp
Quantum signal is used as after decaying, strong optical signal is as local oscillation signal.As shown in Fig. 2, herein particular by the inclined of 1:99
Shake beam splitter, and laser pulse signal is divided into two optical pulse signals.
Random number generates step
Generate binary random number x by tandom number generator, random number 2N (N is natural number, due to required precision with
And instrument limitation, N take 10) bit be divided into one group, every group of a random number of 2N (20) is handled, every N (10) bit is mapped as
Equally distributed random number in one section 0-1 generates equally distributed random number x with this；Pass throughIt is public
Formula generates the random number y of Ruili distribution, and wherein x is the random number x previously generated.
It includes being related to conversion of the binary system random number to Gauss number that entire random number, which generates step,.Random number occurs
The random number that device generates obeys 0,1 distribution, and required random number need to obey Gauss in continuous variable quantum key distribution
Distribution, the present invention propose that a kind of effective scheme converts binary random number to the random number of Gaussian Profile.Enable u1And u2It presses
Two equally distributed random numbers in sequence above-mentioned steps, according to formulaIt is one available
The random number of Gaussian Profile.
Modulation step includes:
The random number of rayleigh distributed is modulated in the amplitude of quantum signal, equally distributed random number is modulated at quantum
In the phase of signal.Since Gaussian Profile can be obtained by rayleigh distributed and equally distributed product, this way is that is, two
System random number is modulated on quantum signal after being converted into random numbers of Gaussian distribution.Alice is by phase and amplitude modulation to phase
Dry state canonical component X and P carry out coded modulation, and signal light is made to obey a mean value zero, variance VAGaussian Profile；Its
In, VAValue range be greater than 0 and less than 100.
Coupling step includes:
Modulated quantum signal and local oscillation signal are passed through into one starting of free space channel by time-division and palarization multiplexing
Give receiving end, it should be noted that signal light and polarised light are to carry out coupling just to enter certainly after beam splitter in Fig. 2
It is transmitted in space channel.
As shown in figure 3, receiving end carries out polarization compensation by time-division and the demultiplexing of polarization, and to the signal received, most
The regular position X of the signal received afterwards using low noise homodyne detector random measurement the or value P of canonical momentum.
The detection process of homodyne detector are as follows: first to the phase-modulation of 0 degree or 90 degree of the phase progress of signal light, then
Modulated signal light inputs two interfaces of beam splitter of 50:50 together with local oscillator light, then the homodyne detector of access calibration
It is detected.For carry out relatively long distance free space continuous variable quantum key distribution, using the low Gao Ling of LO power requirement
Quick zero-difference detection device enables us to reach shot noise limit in the parameter region being unable to reach in the past.
By in delay line insertion system, so as to accurately balance interference instrument.
Then coupling photodissociation uncoupling of the receiving end first to receiving is polarized by dynamic polarization control device (DPC)
Feedback control then carries out polarization and time demultiplexing, and randomly chooses measurement component X and P by homodyne detector.
Since transmitting terminal and receiving end have been modular processing, before signal is passed to free space channel and free sky is left
Between there is after channel coupler to carry out coupling and decoupling processing inserted i.e. so that module different in whole system can achieve
Purpose, meanwhile, also facilitate system to improve and safeguard.
On the basis of the above-mentioned continuous variable quantum key delivering method based on free space, the present invention also provides one kind
Continuous variable quantum key distribution system based on free space, comprising:
Signal constructing module: laser is issued, and copped wave, light-splitting processing are carried out to laser, constructs local oscillation signal and quantum letter
Number；
Random-number-generating module: one group of rayleigh distributed and equally distributed random number are generated；
Modulation module: the quantum signal constructed is adjusted using the rayleigh distributed and equally distributed random number of generation
System；
Coupling module: modulated quantum signal is coupled in free space with local oscillation signal and is transmitted.
Specifically, signal constructing module includes:
Transmitting terminal generates laser using laser, and before this, transmitting terminal and receiving end are needed to continuous variable amount first
Information source, random number source, codec, detector and the control circuit of quantum key distribution system clock are initialized.
Copped wave is carried out to laser using High Extinction Ratio modulator, and controls bias point voltage by feeding back to stablize output
Laser pulse signal.Copped wave is carried out to the laser that laser issues here by the copped wave effect of High Extinction Ratio modulator, is used
Laser pulse signal is generated, the duty ratio of the laser pulse signal after copped wave is generally 10% or so.To stablize High Extinction Ratio
The bias voltage of modulator generates better optical pulse waveform, can reduce two as far as possible used here as High Extinction Ratio modulator
Photon residual between light pulse.
Laser pulse signal is divided into two-way, wherein being all the way low light signals, another way is strong optical signal, low light signals warp
Quantum signal is used as after decaying, strong optical signal is as local oscillation signal.As shown in Fig. 2, herein particular by the inclined of 1:99
Shake beam splitter, and laser pulse signal is divided into two optical pulse signals.
Random-number-generating module includes:
Binary random number x is generated by tandom number generator, random number 2N (20) bit is divided into one group, to every group
2N (20) a random number is handled, and every N (10) bit is mapped as the equally distributed random number in the section 0-1, is produced with this
Raw equally distributed random number x；Pass throughFormula generates the random number y of Ruili distribution, and wherein x is first
The random number x of preceding generation.
It includes being related to conversion of the binary system random number to Gauss number that entire random number, which generates step,.Random number occurs
The random number that device generates obeys 0,1 distribution, and required random number need to obey Gauss in continuous variable quantum key distribution
Distribution, the present invention propose that a kind of effective scheme converts binary random number to the random number of Gaussian Profile.Enable u1And u2It presses
Two equally distributed random numbers in sequence above-mentioned steps, according to formulaIt is one available
The random number of Gaussian Profile.
Modulation module includes:
The random number of rayleigh distributed is modulated in the amplitude of quantum signal, equally distributed random number is modulated at quantum
In the phase of signal, that is, random numbers of Gaussian distribution is modulated on quantum signal.Alice passes through phase and amplitude modulation pair
Coherent state canonical component X and P carry out coded modulation, and signal light is made to obey a mean value zero, variance VAGaussian Profile；
Wherein, VAValue range be greater than 0 and less than 100.
Coupling module includes:
Modulated quantum signal and local oscillation signal are passed through into one starting of free space channel by time-division and palarization multiplexing
Give receiving end, it should be noted that signal light and polarised light are to carry out coupling just to enter certainly after beam splitter in Fig. 2
It is transmitted in space channel.
As shown in figure 3, receiving end carries out polarization compensation by time-division and the demultiplexing of polarization, and to the signal received, most
The regular position X of the signal received afterwards using low noise homodyne detector random measurement the or value P of canonical momentum.
The detection process of homodyne detector are as follows: first to the phase-modulation of 0 degree or 90 degree of the phase progress of signal light, then
Modulated signal light inputs two interfaces of beam splitter of 50:50 together with local oscillator light, then the homodyne detector of access calibration
It is detected.For carry out relatively long distance free space continuous variable quantum key distribution, using the low Gao Ling of LO power requirement
Quick zero-difference detection device enables us to reach shot noise limit in the parameter region being unable to reach in the past.
By in delay line insertion system, so as to accurately balance interference instrument.
Then coupling photodissociation uncoupling of the receiving end first to receiving is polarized by dynamic polarization control device (DPC)
Feedback control then carries out polarization and time demultiplexing, and randomly chooses measurement component X and P by homodyne detector.
Since transmitting terminal and receiving end have been modular processing, before signal is passed to free space channel and free sky is left
Between there is after channel coupler to carry out coupling and decoupling processing inserted i.e. so that module different in whole system can achieve
Purpose, meanwhile, also facilitate system to improve and safeguard.
One skilled in the art will appreciate that in addition to realizing system provided by the invention in a manner of pure computer readable program code
It, completely can be by the way that method and step be carried out programming in logic come so that the present invention provides and its other than each device, module, unit
System and its each device, module, unit with logic gate, switch, specific integrated circuit, programmable logic controller (PLC) and embedding
Enter the form of the controller that declines etc. to realize identical function.So system provided by the invention and its every device, module, list
Member is considered a kind of hardware component, and to include in it can also for realizing the device of various functions, module, unit
To be considered as the structure in hardware component；It can also will be considered as realizing the device of various functions, module, unit either real
The software module of existing method can be the structure in hardware component again.
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited to above-mentioned
Particular implementation, those skilled in the art can make a variety of changes or modify within the scope of the claims, this not shadow
Ring substantive content of the invention.In the absence of conflict, the feature in embodiments herein and embodiment can any phase
Mutually combination.
Claims (10)
1. a kind of continuous variable quantum key delivering method based on free space characterized by comprising
Signal constitution step: laser is issued, and copped wave, light-splitting processing are carried out to laser, constructs local oscillation signal and quantum signal；
Random number generates step: generating one group of rayleigh distributed and equally distributed random number；
Modulation step: the quantum signal constructed is modulated using the rayleigh distributed and equally distributed random number of generation；
Coupling step: modulated quantum signal is coupled in free space with local oscillation signal and is transmitted.
2. the continuous variable quantum key delivering method according to claim 1 based on free space, which is characterized in that institute
Stating signal constitution step includes:
Generate laser using laser, copped wave carried out to laser using modulator, and controlled by feeding back bias point voltage with
Stablize output laser pulse signal；
Laser pulse signal is divided into two-way, wherein being all the way low light signals, another way is strong optical signal, and low light signals are through decaying
It is used as quantum signal afterwards, strong optical signal is as local oscillation signal.
3. the continuous variable quantum key delivering method according to claim 1 based on free space, which is characterized in that institute
Stating random number generation step includes:
Binary random number x is generated by tandom number generator, random number 2N bit is divided into one group, and N is natural number, to every
2N random number of group is handled, and every Nbit is mapped as the equally distributed random number in the section 0-1, is generated uniformly with this
The random number x of distribution；
Pass throughFormula generates the random number y of Ruili distribution.
4. the continuous variable quantum key delivering method according to claim 1 based on free space, which is characterized in that institute
Stating modulation step includes:
The random number of rayleigh distributed is modulated in the amplitude of quantum signal, equally distributed random number is modulated at quantum signal
Phase on.
5. the continuous variable quantum key delivering method according to claim 1 based on free space, which is characterized in that institute
Stating coupling step includes:
Modulated quantum signal is sent jointly to local oscillation signal by free space channel by time-division and palarization multiplexing
Receiving end, receiving end are carried out polarization compensation by time-division and the demultiplexing of polarization, and to the signal received, are finally examined using homodyne
Survey the regular position for the signal that device random measurement receives or the value of canonical momentum.
6. a kind of continuous variable quantum key distribution system based on free space characterized by comprising
Signal constructing module: laser is issued, and copped wave, light-splitting processing are carried out to laser, constructs local oscillation signal and quantum signal；
Random-number-generating module: one group of rayleigh distributed and equally distributed random number are generated；
Modulation module: the quantum signal constructed is modulated using the rayleigh distributed and equally distributed random number of generation；
Coupling module: modulated quantum signal is coupled in free space with local oscillation signal and is transmitted.
7. the continuous variable quantum key distribution system according to claim 6 based on free space, which is characterized in that institute
Stating signal constructing module includes:
Generate laser using laser, copped wave carried out to laser using modulator, and controlled by feeding back bias point voltage with
Stablize output laser pulse signal；
Laser pulse signal is divided into two-way, wherein being all the way low light signals, another way is strong optical signal, and low light signals are through decaying
It is used as quantum signal afterwards, strong optical signal is as local oscillation signal.
8. the continuous variable quantum key distribution system according to claim 6 based on free space, which is characterized in that institute
Stating random-number-generating module includes:
Binary random number x is generated by tandom number generator, random number 2Nbit is divided into one group, and N is natural number, to every
2N random number of group is handled, and every N bit is mapped as the equally distributed random number in the section 0-1, is generated with this
The random number x of even distribution；
Pass throughFormula generates the random number y of Ruili distribution.
9. the continuous variable quantum key distribution system according to claim 6 based on free space, which is characterized in that institute
Stating modulation module includes:
The random number of rayleigh distributed is modulated in the amplitude of quantum signal, equally distributed random number is modulated at quantum signal
Phase on.
10. the continuous variable quantum key distribution system according to claim 6 based on free space, which is characterized in that
The coupling module includes:
Modulated quantum signal is sent jointly to local oscillation signal by free space channel by time-division and palarization multiplexing
Receiving end, receiving end are carried out polarization compensation by time-division and the demultiplexing of polarization, and to the signal received, are finally examined using homodyne
Survey the regular position for the signal that device random measurement receives or the value of canonical momentum.
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Cited By (9)
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| CN110113163A (en) * | 2019-05-22 | 2019-08-09 | 上海循态信息科技有限公司 | Free space continuous variable quantum key delivering method and system |
| CN110166137A (en) * | 2019-05-28 | 2019-08-23 | 中国电子科技集团公司第三十研究所 | It is a kind of to bias unrelated Gaussian modulation quantum optical signal generation apparatus and method |
| CN110492991A (en) * | 2019-04-18 | 2019-11-22 | 上海循态信息科技有限公司 | Method for parameter estimation and system based on free space CVQKD system |
| CN111106934A (en) * | 2019-12-11 | 2020-05-05 | 中国电子科技集团公司第三十研究所 | Bias point control method and device suitable for CV-QKD system |
| CN111162905A (en) * | 2020-03-10 | 2020-05-15 | 中国科学技术大学 | Quantum key distribution system and decoding method thereof |
| CN111211900A (en) * | 2020-01-16 | 2020-05-29 | 无锡太湖学院 | Polarization pair-wise encoding method for free space continuous variable quantum key distribution |
| CN111314071A (en) * | 2020-02-14 | 2020-06-19 | 上海循态信息科技有限公司 | Continuous variable quantum key distribution method and system |
| CN113225136A (en) * | 2021-03-25 | 2021-08-06 | 中国人民解放军国防科技大学 | Free space quantum key distribution system capable of realizing self-adaptive phase compensation |
| CN113452524A (en) * | 2021-07-20 | 2021-09-28 | 中南大学 | Free space continuous variable quantum key distribution system based on space diversity technology and implementation method thereof |
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| CN110113163A (en) * | 2019-05-22 | 2019-08-09 | 上海循态信息科技有限公司 | Free space continuous variable quantum key delivering method and system |
| CN110166137B (en) * | 2019-05-28 | 2021-12-17 | 中国电子科技集团公司第三十研究所 | Bias-independent Gaussian modulation quantum optical signal generation device and method |
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| CN111162905B (en) * | 2020-03-10 | 2021-03-09 | 中国科学技术大学 | Quantum key distribution system and decoding method thereof |
| CN111162905A (en) * | 2020-03-10 | 2020-05-15 | 中国科学技术大学 | Quantum key distribution system and decoding method thereof |
| CN113225136A (en) * | 2021-03-25 | 2021-08-06 | 中国人民解放军国防科技大学 | Free space quantum key distribution system capable of realizing self-adaptive phase compensation |
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