CN107666353A - Local local oscillator continuous variable quantum key delivering method based on phase compensation - Google Patents
Local local oscillator continuous variable quantum key delivering method based on phase compensation Download PDFInfo
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- CN107666353A CN107666353A CN201710757263.0A CN201710757263A CN107666353A CN 107666353 A CN107666353 A CN 107666353A CN 201710757263 A CN201710757263 A CN 201710757263A CN 107666353 A CN107666353 A CN 107666353A
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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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- 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
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
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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
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/54—Intensity modulation
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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
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/548—Phase or frequency modulation
-
- 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
-
- 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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- Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Electromagnetism (AREA)
- Computer Security & Cryptography (AREA)
- Optics & Photonics (AREA)
- Optical Communication System (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The invention provides a kind of local local oscillator continuous variable quantum key delivering method based on phase compensation, it comprises the following steps：Step 1, the generation of clock；Step 2, phase reference signal separate with quantum signal；Step 3, phase reference signal and quantum signal palarization multiplexing；Step 4, phase reference signal separate with quantum signal；Step 5, two-way interference detection；Step 6, phase compensation.The present invention produces local oscillator light in receiving terminal, avoids listener-in in the channel by changing local oscillator light and steal information, improves the security of system.In addition, by sending real-time phase reference signal, reduce phase noise, the system of reducing crosses noise, lifts safe code check.Additionally by two-way interference detection, both added the speed of system, again cause unlike signal detection will not saturation, systematic function lifting.
Description
Technical field
The present invention relates to a kind of cipher key distribution scheme, in particular it relates to which a kind of local local oscillator based on phase compensation is continuous
Variable quantum key delivering method.
Background technology
Under the background that computer information technology develops rapidly, requirement of the information technology to Information Security increasingly increases.
In recent years, because quantum key distribution technology can physically ensure the Unconditional security of communication, and cause that people's is wide
General concern.
Quantum key distribution technology can be divided into two major classes on the whole：Discrete variable quantum key distribution and continuous variable quantum
Key is distributed.To be compared with discrete variable quantum key distribution, continuous variable quantum key distribution has higher code check, therefore,
The numerous studies of many researchers' progress in theory and are experimentally attracted.Quantum-mechanical general principle is relied on, it is continuous to become
The theory α coefficient of amount is by Strict Proof.However, its physical security is still in conceptual phase.And the phase of physical security
Close in research, be exactly local oscillator light the problem of main the problem of：Initial continuous variable quantum key distribution agreement need by
Local oscillator light is sent to receiving terminal from transmitting terminal is interfered with signal, and listener-in can be reached by changing local oscillator light in the channel
To the purpose of steal information.
In order to make up this leak, some researchers propose and do not transmit local oscillator light, and produce local oscillator light in receiving terminal
Scheme, the program solves the problems, such as the leak for transmitting local oscillator light to a certain extent, but the program is disadvantageous in that local
Caused local oscillator light and signal light frequency are inconsistent, and phase place change is big, therefore can produce larger phase noise.And larger phase
Position noise can cause larger noise excessively, once crossing noise exceedes threshold value, will be unable to extract key from transmission information.
The content of the invention
For in the prior art the defects of, it is an object of the invention to provide a kind of local local oscillator based on phase compensation is continuous
Variable quantum key delivering method, it reduces phase noise, improves the key rate of system.
According to an aspect of the present invention, there is provided a kind of local local oscillator continuous variable quantum key based on phase compensation point
Forwarding method, it is characterised in that the local local oscillator continuous variable quantum key delivering method based on phase compensation includes following
Step：
Step 1, the generation of clock；Continuous variable quantum key distribution system transmitting terminal is produced by narrow linewidth laser
Raw continuous light, and continuous light is cut into by light-pulse generator by the intensity modulator of a High Extinction Ratio；
Step 2, phase reference signal separate with quantum signal；Pass through one 99：Light-pulse generator is divided into by 1 beam splitter
Powerful phase reference signal and low power quantum signal；Powerful phase reference signal is believed by delay line and quantum
Number separated in time domain, low power flashlight passes through intensity modulator and phase-modulator carries out Gaussian modulation；
Step 3, phase reference signal and quantum signal palarization multiplexing；Flashlight and phase reference signal are closed by polarizing
Beam device merges progress palarization multiplexing and is transferred to receiving terminal；
Step 4, phase reference signal separate with quantum signal；After receiving terminal receives signal, Polarization Control is adjusted manually
Device, reference signal is separated with quantum signal by polarization beam apparatus；
Step 5, two-way interference detection；In receiving terminal local oscillator light, and and phase are produced using the laser of a same frequency
Reference signal and quantum signal carry out relevant detection respectively；
Step 6, phase compensation；The phase reference signal obtained with measurement, is compensated to the phase drift of quantum signal
Recover, finally carry out the extraction of primary key again.
Preferably, the local oscillator is just locally generated.
Preferably, the local local oscillator continuous variable quantum key delivering method based on phase compensation has used two phases
Dry detector, therefore interfered respectively using the local oscillator light of varying strength.
Preferably, the phase reference signal be with quantum signal with caused, therefore its phase place change will and quantum
Signal is consistent, plays the purpose of monitoring quantum signal in real time.
Preferably, the phase reference signal and quantum signal are divided as much as possible by time division multiplexing and polarization multiplexing
Open, reduce two paths of signals and noise is crossed caused by crosstalk.
Compared with prior art, the present invention has following beneficial effect：The present invention has extremely strong security and high code
Rate.First in actual quantum key distribution system, listener-in can change the purpose that local oscillator light reaches eavesdropping in the channel.And
The program avoids the transmission of local oscillator light, compensate for listener-in using local oscillator optical transport by producing local oscillator light in receiving terminal
Leak；On the other hand, flashlight and local oscillator light come from different light sources, and phase jitter can be very big, therefore the present invention is producing
Phase reference signal is produced while quantum signal, such phase reference signal will keep track of the phase drift of quantum signal
Situation, finally after interference detects, phase drift compensation is gone back.Phase noise after compensation will very little, thus system
Crossing noise also can very little so that safe code check improves.
Brief description of the drawings
The detailed description made by reading with reference to the following drawings to non-limiting example, further feature of the invention,
Objects and advantages will become more apparent upon：
Fig. 1 is the schematic diagram of the local local oscillator continuous variable quantum key delivering method of the invention based on phase compensation.
Embodiment
With reference to specific embodiment, the present invention is described in detail.Following examples will be helpful to the technology of this area
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill to this area
For personnel, without departing from the inventive concept of the premise, various modifications and improvements can be made.These belong to the present invention
Protection domain.
As shown in figure 1, the local local oscillator continuous variable quantum key delivering method based on phase compensation of the invention include with
Lower step：
Step 1, the generation of clock；Continuous variable quantum key distribution system transmitting terminal is produced by narrow linewidth laser
Raw continuous light, and continuous light is cut into by light-pulse generator by the intensity modulator of a High Extinction Ratio.
Step 2, phase reference signal separate with quantum signal；Pass through one 99：Light-pulse generator is divided into by 1 beam splitter
Powerful phase reference signal and low power quantum signal.Powerful phase reference signal is believed by delay line and quantum
Number separated in time domain, low power flashlight passes through intensity modulator and phase-modulator carries out Gaussian modulation.
Step 3, phase reference signal and quantum signal palarization multiplexing；Flashlight and phase reference signal are closed by polarizing
Beam device merges progress palarization multiplexing and is transferred to receiving terminal.
Step 4, phase reference signal separate with quantum signal；After receiving terminal receives signal, Polarization Control is adjusted manually
Device, reference signal is separated with quantum signal by polarization beam apparatus.
Step 5, two-way interference detection；In receiving terminal local oscillator light, and and phase are produced using the laser of a same frequency
Reference signal and quantum signal carry out relevant detection respectively.
Step 6, phase compensation；The phase reference signal obtained with measurement, is compensated to the phase drift of quantum signal
Recover, finally carry out the extraction of primary key again.
High-precision phase position compensates local local oscillator continuous variable quantum key distribution scheme, is to produce clock in transmitting terminal,
And quantum signal and phase reference signal are classified as, quantum signal is subjected to Gaussian modulation, and phase reference signal is passed through
Delay line carries out time-domain seperation.By time-division multiplex technology and polarization multiplexing, two paths of signals is merged and passed by optical fiber
It is defeated to arrive receiving terminal.In receiving terminal, Polarization Controller is manually adjusted, phase reference signal and quantum signal are separated,
Simultaneously in locally generated local oscillator light, interfered respectively with two paths of signals, phase reference signal result of interference is used for believing quantum
Number phase drift compensate.High-precision phase position of the present invention compensates the sheet of local local oscillator continuous variable quantum key distribution scheme
Shake just locally generated, therefore listener-in can not reach the purpose of eavesdropping by changing local oscillator light, the security of the program obtains
To improve；The high-accuracy compensation has used two coherence detectors with reference to local local oscillator continuous variable quantum key distribution scheme,
Therefore the local oscillator light of varying strength can be used to be interfered respectively, can thus avoids phase reference signal too strong and cause
Saturation problem；The phase reference signal that the high-precision phase position compensates local local oscillator continuous variable quantum key distribution scheme be with
Quantum signal is with caused by, therefore its phase place change will be consistent with quantum signal, can play implementing monitoring quantum signal
Purpose；The high-precision phase position compensates the phase reference signal and quantum letter of local local oscillator continuous variable quantum key distribution scheme
It is separated as much as possible, so that crosstalk between the two reaches minimum, due to crosstalk number by time division multiplexing and palarization multiplexing
Caused by cross noise it is also minimum.
Below based on above-mentioned system and method, there is provided concrete application example：
First in transmitting terminal using a frequency locking laser as coherent source, the line width of laser is 80kHz, and it is exported
Light is cut into 50MHz pulse train by extinction ratio up to 60dB AM modulators, and the pulsewidth of generation is 2ns.
Then 99 are passed through:1 beam splitter is divided into two beams, wherein the conduct quantum signal that a beam power is small, high-power
Another Shu Zuowei phase reference signals, and Gaussian modulation is carried out to quantum signal.
Quantum signal and phase reference signal are merged by time division multiplexing and polarization multiplexing, and by decaying to
0.2dB/km 20km fiber reel reaches receiving terminal, is divided two-way polarization by a manual Polarization Controller in receiving terminal
From.
Local oscillator light is produced by another frequency locking laser receiving terminal is local, and with the above-mentioned phase reference signal separated
Interfered respectively with quantum signal；Quantum signal and phase reference signal are made for the adjustable delay line of ps levels by a precision
Alignment so that the phase reference signal after interference can reflect the phase drift of quantum signal completely.
Two-way interference signal is sampled afterwards, and carries out data processing.Specifically, the phase obtained on phase reference road
Position is referenced as θref, and it is x to measure obtained quantum signal datamea,pmea, then actual xreal,prealBy below equation (1) and
(2) obtain：
xreal=xmeacosθref-pmeasinθref……(1)
preal=xmeasinθref+pmeacosθref……(2)
Obtain actual xreal,prealCarry out data agreement to it again afterwards and strengthen with secrecy, finally obtain key.
The present invention has superpower security and high code check, by producing local oscillator light in receiving terminal and being carried out with quantum signal
Relevant detection, avoids the transmission of local oscillator light, and so as to compensate for the leak that listener-in utilizes local oscillator light in the channel, security obtains
With lifting；In addition, the program has high code check simultaneously, because quantum signal pulse and phase reference pulse source are same light source
And produce simultaneously, therefore its phase is consistent, phase reference pulse can be good at being monitored the phase drift of quantum signal,
So as to be compensated in post processing.The program can reduce phase noise, and thereby also reduce system crosses noise, so that
Obtain safe code check lifting.The present invention receiving terminal produce local oscillator light, avoid listener-in in the channel by change local oscillator light and
Steal information, improve the security of system.In addition, by sending real-time phase reference signal, subtract phase noise
Few, the system of reducing crosses noise, lifts safe code check.Additionally by two-way interference detection, the speed of system was both added, again
So that the detection of unlike signal will not saturation, systematic function lifting.
The specific embodiment of the present invention is described above.It is to be appreciated that the invention is not limited in above-mentioned
Particular implementation, those skilled in the art can make various deformations or amendments within the scope of the claims, this not shadow
Ring the substantive content of the present invention.
Claims (5)
1. a kind of local local oscillator continuous variable quantum key delivering method based on phase compensation, it is characterised in that described to be based on
The local local oscillator continuous variable quantum key delivering method of phase compensation comprises the following steps：
Step 1, the generation of clock；Continuous variable quantum key distribution system transmitting terminal produces company by narrow linewidth laser
Continuous light, and continuous light is cut into by light-pulse generator by the intensity modulator of a High Extinction Ratio；
Step 2, phase reference signal separate with quantum signal；Pass through one 99：Light-pulse generator is divided into big work(by 1 beam splitter
The phase reference signal of rate and low power quantum signal；Powerful phase reference signal is existed by delay line and quantum signal
Separated in time domain, low power flashlight carries out Gaussian modulation by intensity modulator and phase-modulator；
Step 3, phase reference signal and quantum signal palarization multiplexing；Flashlight and phase reference signal pass through polarization beam combiner
Merge progress palarization multiplexing and be transferred to receiving terminal；
Step 4, phase reference signal separate with quantum signal；After receiving terminal receives signal, Polarization Controller is adjusted manually,
Reference signal is separated with quantum signal by polarization beam apparatus；
Step 5, two-way interference detection；In receiving terminal local oscillator light, and and phase reference are produced using the laser of a same frequency
Signal and quantum signal carry out relevant detection respectively；
Step 6, phase compensation；With the obtained phase reference signal of measurement, the phase drift of quantum signal is compensated extensive
It is multiple, the extraction of primary key is finally carried out again.
2. the local local oscillator continuous variable quantum key delivering method according to claim 1 based on phase compensation, it is special
Sign is that the local oscillator is just locally generated.
3. the local local oscillator continuous variable quantum key delivering method according to claim 1 based on phase compensation, it is special
Sign is that the local local oscillator continuous variable quantum key delivering method based on phase compensation has used two coherent detections
Device, therefore interfered respectively using the local oscillator light of varying strength.
4. the local local oscillator continuous variable quantum key delivering method according to claim 1 based on phase compensation, it is special
Sign is that the phase reference signal is same caused with quantum signal, therefore its phase place change will be consistent with quantum signal,
Play the purpose of monitoring quantum signal in real time.
5. the local local oscillator continuous variable quantum key delivering method according to claim 1 based on phase compensation, it is special
Sign is that the phase reference signal and quantum signal are separated as much as possible by time division multiplexing and polarization multiplexing, reduces
Two paths of signals crosses noise caused by crosstalk.
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108696352A (en) * | 2018-05-25 | 2018-10-23 | 中南大学 | The unrelated quantum key distribution system of continuous variable measuring apparatus and its implementation |
| CN109194470A (en) * | 2018-09-07 | 2019-01-11 | 中南大学 | High-efficiency and continuous variable quantum key delivering method |
| CN109586911A (en) * | 2019-02-01 | 2019-04-05 | 上海循态信息科技有限公司 | Continuous variable quantum key delivering method based on coherent optical communication system |
| CN110048776A (en) * | 2018-11-22 | 2019-07-23 | 中国人民解放军空军工程大学 | Mutual backup quantum key distribution system and method based on less fundamental mode optical fibre mode multiplexing |
| CN110166233A (en) * | 2019-05-14 | 2019-08-23 | 中国科学院半导体研究所 | A kind of on piece encoder |
| CN110445610A (en) * | 2019-08-26 | 2019-11-12 | 上海循态信息科技有限公司 | Polarization method for tracing, system and the medium of continuous variable quantum key distribution system |
| WO2020020100A1 (en) * | 2018-07-23 | 2020-01-30 | 华为技术有限公司 | Quantum key transmission device and system |
| CN110868296A (en) * | 2019-12-13 | 2020-03-06 | 中南大学 | Multichannel parallel continuous variable quantum key distribution method based on optical frequency comb |
| CN110896329A (en) * | 2018-09-12 | 2020-03-20 | 中国科学技术大学 | Continuous variable quantum key distribution coherent detection system based on local oscillator light scheme |
| WO2020200449A1 (en) * | 2019-04-04 | 2020-10-08 | Huawei Technologies Duesseldorf Gmbh | Optical injection locking in quantum key distribution |
| CN111786730A (en) * | 2020-06-08 | 2020-10-16 | 中国电子科技集团公司第三十研究所 | Pilot frequency assisted local oscillator continuous variable quantum key distribution system and method |
| CN113660075A (en) * | 2021-09-18 | 2021-11-16 | 上海循态量子科技有限公司 | Method and system for synchronizing distribution bit frames of non-homologous local oscillator optical continuous variable quantum key |
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Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108696352B (en) * | 2018-05-25 | 2020-10-23 | 中南大学 | Continuous variable measuring equipment-independent quantum key distribution system and implementation method thereof |
| CN108696352A (en) * | 2018-05-25 | 2018-10-23 | 中南大学 | The unrelated quantum key distribution system of continuous variable measuring apparatus and its implementation |
| WO2020020100A1 (en) * | 2018-07-23 | 2020-01-30 | 华为技术有限公司 | Quantum key transmission device and system |
| CN110752913A (en) * | 2018-07-23 | 2020-02-04 | 华为技术有限公司 | Quantum key transmission device and system |
| CN109194470A (en) * | 2018-09-07 | 2019-01-11 | 中南大学 | High-efficiency and continuous variable quantum key delivering method |
| CN110896329A (en) * | 2018-09-12 | 2020-03-20 | 中国科学技术大学 | Continuous variable quantum key distribution coherent detection system based on local oscillator light scheme |
| CN110048776A (en) * | 2018-11-22 | 2019-07-23 | 中国人民解放军空军工程大学 | Mutual backup quantum key distribution system and method based on less fundamental mode optical fibre mode multiplexing |
| CN109586911A (en) * | 2019-02-01 | 2019-04-05 | 上海循态信息科技有限公司 | Continuous variable quantum key delivering method based on coherent optical communication system |
| CN109586911B (en) * | 2019-02-01 | 2021-08-31 | 上海循态信息科技有限公司 | Continuous variable quantum key distribution method based on coherent optical communication system |
| CN113632414B (en) * | 2019-04-04 | 2024-06-11 | 杜塞尔多夫华为技术有限公司 | Light injection locking in quantum key distribution |
| CN113632414A (en) * | 2019-04-04 | 2021-11-09 | 杜塞尔多夫华为技术有限公司 | Light injection locking in quantum key distribution |
| WO2020200449A1 (en) * | 2019-04-04 | 2020-10-08 | Huawei Technologies Duesseldorf Gmbh | Optical injection locking in quantum key distribution |
| CN110166233A (en) * | 2019-05-14 | 2019-08-23 | 中国科学院半导体研究所 | A kind of on piece encoder |
| CN110445610B (en) * | 2019-08-26 | 2021-11-30 | 上海循态量子科技有限公司 | Polarization tracking method, system and medium for continuous variable quantum key distribution system |
| CN110445610A (en) * | 2019-08-26 | 2019-11-12 | 上海循态信息科技有限公司 | Polarization method for tracing, system and the medium of continuous variable quantum key distribution system |
| CN110868296A (en) * | 2019-12-13 | 2020-03-06 | 中南大学 | Multichannel parallel continuous variable quantum key distribution method based on optical frequency comb |
| CN111786730A (en) * | 2020-06-08 | 2020-10-16 | 中国电子科技集团公司第三十研究所 | Pilot frequency assisted local oscillator continuous variable quantum key distribution system and method |
| CN113660075A (en) * | 2021-09-18 | 2021-11-16 | 上海循态量子科技有限公司 | Method and system for synchronizing distribution bit frames of non-homologous local oscillator optical continuous variable quantum key |
| CN113660075B (en) * | 2021-09-18 | 2024-02-27 | 上海循态量子科技有限公司 | Non-homologous local oscillation light continuous variable quantum key distribution bit frame synchronization method and system |
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