CN110324140A - A kind of decoding apparatus, method and dissemination system for continuous variable quantum key distribution - Google Patents
A kind of decoding apparatus, method and dissemination system for continuous variable quantum key distribution Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
- H04L9/0816—Key establishment, i.e. cryptographic processes or cryptographic protocols whereby a shared secret becomes available to two or more parties, for subsequent use
- H04L9/0852—Quantum cryptography
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- 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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Abstract
The invention proposes a kind of decoding apparatus, method and dissemination system for continuous variable quantum key distribution, local local oscillator light is wherein generated by way of injection locking excitation based on pilot tone light, and coherent interference is formed with the local local oscillator light and signal light, the decoding to signal light is provided by being detected to the coherent interference result.By this decoding process, it can solve local laser in the prior art and the more difficult unified line width of pilot tone light, signal light and wavelength and device design the problems such as complicated.
Description
Technical field
The present invention relates to quantum key distribution fields, and in particular to a kind of to be used for continuous variable based on injection locking technique
The quantum key distribution system and its decoding apparatus and method of quantum key distribution (CVQKD).
Background technique
In Internet era, it is huge convenient that digital communication is brought to people's lives.With internet communication amount
Increase, communication security becomes more and more important.In order to reach secure communication, people usually require to encrypt information, to prevent
Only third-party eavesdropping.Quantum key distribution (QKD) can effectively solve key in the transmission problem of insecure channels.With tradition
Cipher mode is different dependent on computation complexity, and the safety of quantum key distribution is the basic principle based on quantum physics, nothing
There is how strong computing capability to be impossible to steal key by third party listener-in.Continuous variable quantum key distribution (CVQKD) is
An important branch in quantum key distribution field.Because it uses the quadrature component of electromagnetic field at transmitting terminal (i.e. coding side)
(location components and momentum component) carrys out modulation intelligence, receiving end (i.e. decoding end) using coherent detection technology (zero-difference detection and
Heterodyne detection) the characteristics of carrying out demodulating information, the quantum key distribution of continuous variable can be realized with the communication device of standard, and
And be suitble to share an optical fiber transmission with classical signals, from this, this continuous variable quantum key distribution technology is hopeful
As a kind of low cost, the high quantum key distribution scheme at code rate.Therefore, one important point as quantum key distribution
It is very great to develop practical continuous variable quantum key distribution system meaning for branch.
Fig. 1 shows a kind of continuous variable quantum key distribution system in the prior art.As shown, in the continuous change
It measures in quantum key distribution system, a branch of pulsed light is sent by the laser at the end Alice, which passes through a beam splitter
BS point is the biggish pulse guide-frequency light of intensity and the faint pulse light of intensity.Wherein pilot tone light is a strong phase base
Standard, but its own does not carry any information, it is believed that it is classical signals.Signal light the end Alice by using amplitude modulator,
Phase-modulator and attenuator realize Gaussian modulation.Another way pilot tone light is by time division multiplexing and palarization multiplexing and modulated letter
Number optically coupling in an optical fiber, and it is transferred to receiving end Bob.
After receiving end Bob receives the coupled signal sended over by the end Alice, Polarization Controller and polarization are used first
Beam splitter comes fractional dose subsignal light and pilot tone light.It is admitted to two-way zero-difference detection respectively after quantum signal light and the separation of pilot tone light
In device a and b, wherein delay line can be used to control the time that this two-way light reaches detector, as shown in Figure 1.At the same time,
The end Bob is also required to generate a local oscillator light for carrying out coherent detection.As shown in Figure 1, the local oscillator light will be by local laser
Device generates, and the local oscillator light of local laser output is divided into two-way by beam splitter BS after intensity modulator AM modulation, uses respectively
Enter in zero-difference detection device a and b after carrying out relevant effect with quantum signal light and pilot tone light.Continuous variable shown in Fig. 1
In quantum key distribution system, the pilot tone light detected using zero-difference detection device b can measure quantum signal and entirely be transmitted across
The phase drift generated in journey.
The local oscillator light shown in Fig. 1 that in the prior art, decoding process needs the end Bob locally generated and the end Alice are sent
The signal light and pilot tone light to come over is interfered.Due to the laser and the end Alice laser phase of the locally generated local oscillator light in the end Bob
It is mutually independent, in order to avoid generating excessive phase noise and crossing noise, it is necessary to the signal light of local local oscillator light and the end Alice
It is consistent as far as possible with the wavelength of pilot tone light, to ensure to be formed good interference effect, this requires the laser linewidths used to get over
It is small better.Especially in the scheme of Fig. 1, wavelength coherence request is in MHz magnitude, and laser linewidth is needed in 100kHz magnitude
Within can just be achieved, but the line width of actual laser be hard to reach this level, this just significantly limits this company
The performance of continuous variable quantum key distribution technology.Meanwhile at the end Bob, in order to realize effect that pilot tone light and signal light are interfered respectively
Fruit needs more complicated optical path and more optical device, industrializes higher cost.
Summary of the invention
It is set for local laser in the prior art and the more difficult unified line width of pilot tone light, signal light and wavelength and device
The problems such as meter is complicated, the invention proposes a kind of for the decoding apparatus of continuous variable quantum key distribution, method and distribution system
System.
In the first aspect of the present invention, a kind of decoding apparatus for continuous variable quantum key distribution is disclosed, it can
To include beam splitting module 1, laser module 2 and zero-difference detection module 3.It includes pilot tone that the beam splitting module 1, which can be used for receiving,
The combined beam light of light and signal light, and by the combined beam light the pilot tone light and the signal light separate, wherein the conjunction
The pilot tone light of Shu Guangzhong and the signal light can be derived from same pulsed light.The laser module 2 may include n and swash
Light device, and local local oscillator light is generated via the mode of injection locking excitation based on the pilot tone light as seed light, wherein n
For the natural number greater than zero.The zero-difference detection module 3 can be used for receiving the local local oscillator light and the signal light, and
The coherent interference result of the local local oscillator light and the signal light is detected.
Preferably, the beam splitting module 1 may include polarization-maintaining polarization beam splitting element, such as polarization-maintaining polarization beam apparatus.
Preferably, the zero-difference detection module 3 includes single zero-difference detection device, to simplify the optics knot of decoding apparatus
Structure.
Preferably, the laser pulse of the laser and between the seed light of the laser in pulse width
With can be configured to meet on relative time delay: within a system period, inject the seed light of the laser in time
The laser pulse of the laser can be covered.
Further, the laser module 2 can also include n optical transmission module 4.Preferably, the optics passes
Defeated module 4 may include three ports and be configured to: the seed light for i-th of laser 2i is through i-th of the light
The first port and second port for learning transmission module 4i are injected in i-th of laser 2i, i-th of laser 2i output
Laser pulse exported via the second port and third port of i-th of optical transmission module 4i, wherein i=1 ...,
n.Further, the optical transmission module can be configured to not allow the light pulse from the posterior laser to return
It inputs in the preceding laser.It is highly preferred that the optical transmission module 4 may include circulator.
Another aspect of the present invention also discloses a kind of coding/decoding method for continuous variable quantum key distribution, can be with
It include: combined beam light receiving step, for receiving the combined beam light sent by the end Alice comprising pilot tone light and signal light, wherein institute
It states pilot tone light and the signal light is derived from two components of same pulsed light；Combined beam light spectroscopic step, for making the conjunction beam
The pilot tone light and the signal light in light are separated to transmit along different light paths；Local local oscillator photogenerated step, for being based on
The pilot tone light as seed light generates local local oscillator light via level-one or multistage injection locking excitation process；And it is relevant
Detection steps, for making the intrinsic light in the local and the signal light occur coherent interference, and to the coherent interference result into
Row detection.
Preferably, in the smooth separating step, the pilot tone light and institute can be separated by polarization-maintaining polarization beam splitting element
State signal light.
Preferably, in the intrinsic photogenerated step in the local, laser pulse in laser be used for the laser
It can be configured to meet in pulse width and relative time delay between the seed light of device: within a system period, inject institute
The seed light for stating laser can cover the laser pulse of the laser in time.
Preferably, in the coherent detection step, the coherent interference result is carried out using single zero-difference detection device
Detection.
Another aspect of the present invention also discloses a kind of continuous variable quantum key distribution system comprising mentioned-above
Decoding apparatus.
Detailed description of the invention
Fig. 1 shows a kind of schematic diagram of continuous variable quantum key distribution system in the prior art；
Fig. 2 schematically shows the principles of the decoding apparatus according to the present invention for continuous variable quantum key distribution
Figure；
Fig. 3 schematically shows the laser module according to the present invention that locking excitation process is injected using second level；With
And
Fig. 4 schematically shows the laser modules according to the present invention using multistage injection locking excitation process.
Specific embodiment
Hereinafter, exemplary embodiment of the present invention is with reference to the accompanying drawings to detailed description.The following examples are to illustrate
Mode provide, sufficiently to convey spirit of the invention to those skilled in the art in the invention.Therefore, the present invention is unlimited
In embodiment disclosed herein.
Fig. 2 diagrammatically illustrates the decoding apparatus Bob according to the present invention for continuous variable quantum key distribution, packet
Include beam splitting module 1, laser module 2 and zero-difference detection module 3.
In a continuous variable quantum key distribution system, the end Alice will send the conjunction including pilot tone light and signal light
Shu Guang, wherein pilot tone light and signal light are derived from two components of same pulsed light, and pilot tone light has relatively large intensity,
Signal light has relatively small intensity and modulated to carry quantum key information.As an example, as shown in Figure 1,
The laser module at the end Alice sends a branch of pulsed light, which forms intensity compared with strong and faint intensity two through beam splitting
Component, in which: the stronger component of intensity forms pilot tone light, can be used as strong phase reference and itself does not carry any letter
Breath；The faint component of intensity carries out Gaussian modulation under the action of amplitude modulator, phase-modulator and attenuator, forms signal
Light.Finally, pilot tone light and signal light form combined beam light through time division multiplexing and palarization multiplexing, and transmitted through optical channel to the end Bob.
When Bob termination receives combined beam light, beam splitting module 1 separates signal light and pilot tone light, makes signal light and pilot tone light
It is transmitted along different light paths.Preferably, beam splitting module 1 may include polarization-maintaining polarization beam splitting element, such as polarization-maintaining polarization beam apparatus
PBS。
Pilot tone light with larger light intensity will be used to be injected into laser module 2, make laser die as seed light
The output laser pulse in a manner of injecting locking of block 2, uses as local local oscillator light；Signal light carries quantum modulation letter
Breath, will be transferred to zero-difference detection module 3.
At zero-difference detection module 3, while coherent interference, zero-difference detection will occur for the local local oscillator light and signal light that reach
Module 3 will detect coherent interference result, so that subsequent decoding is used.
Since signal light and pilot tone light source are in same beam pulse, and at the end Alice to undergoing identical transmission between the end Bob
Path, therefore the two wavelength having the same, and the phase drift having the same in entire transmission process.In the present invention
In, local local oscillator light is to be formed in a manner of injecting locking by laser module in the case where pilot tone light is seed light, because
This, local local oscillator light will be consistent with pilot tone light on wavelength, and phase is associated.In this way, it may be implemented in homodyne
The signal light and local local oscillator light interfered at detecting module 3 has consistent wavelength, to solve to be difficult in the prior art
The adjusting local laser accomplished makes its, line width consistent with pilot tone light and signal light wavelength and leads to phase noise and cross noise
Excessive technical problem.
In addition, in the present invention, since local local oscillator light can have phase information associated with pilot tone light,
Also the phase drift introduced in transmission process is carried in its phase information, it will be appreciated by those skilled in the art that when utilizing this
When the local local oscillator light of kind and signal light carry out coherent interference, eliminated in signals transmission in generated result of interference
The influence for the phase drift that may be introduced.It can be seen that by this local local oscillator light producing method, decoding end only need into
Zero-difference detection of row can be obtained accurate as a result, therefore, a zero-difference detection can be only arranged in decoding apparatus of the invention
Module greatly reduces the demand to device compared with the existing technology, reduces system complexity.
Although Fig. 2 schematically shows the form that laser module 2 is single laser, those skilled in the art
It is understood that laser module 2 can also include multiple lasers.When laser module 2 includes single laser, laser
The laser pulse that module 2 exports is to inject locking excitation process through level-one based on pilot tone light to generate.When laser module 2 wraps
When including n (n > 1) a laser, n laser can be configured in a series arrangement, kind of the pilot tone light as the 1st laser
Sub-light, seed light of the laser pulse of a laser output of i-th (i=1 ..., n-1) as i+1 laser, to make
Obtaining the laser pulse that laser module 2 exports is to be generated based on pilot tone light via n grades of injections locking excitation processes.This field
Technical staff is readily appreciated that, when injecting locking excitation process using multistage to generate local local oscillator light, local local oscillator light will have
There is better stability, and more preferable with the wavelength consistency of pilot tone light, so as to provide better phase in decoding apparatus
Dry interference effect.
Preferably, the free oscillation frequency of laser and the difference on the frequency satisfaction between the seed light of the laser are injected
Desired range is locked, so that the seed light that the local oscillator ray laser oscillation in laser can completely inject is controlled, so that this
The frequency of vibration light laser oscillation mode is locked into the frequency of the seed light of injection, and the seed phototiming of phase and injection.
It is highly preferred that in laser module 2 of the invention, laser pulse in each laser be used for the laser
Can be configured to meet in pulse width and relative time delay between the seed light of device: within a system period, injection swashs
The seed light of light device can cover laser pulse in time.By this set, laser pulse is possibly based on seed
Amplitude smoothly partially generates in light pulse, so that obtaining performance preferably injects locking stimulation effect.
In order to realize the output of the injection of seed light and laser pulse in the present invention in a simple manner, of the invention swashs
Light device module 2 can also include optical transmission module 4, and the quantity of optical transmission module 4 can be opposite with the quantity of laser
It answers.According to the present invention, optical transmission module 4 may include three ports, and be configured to: swash for i-th (i=1 ..., n)
In first port and second port i-th of laser of injection of the seed light of light device through i-th of optical transmission module, i-th sharp
The laser pulse of light device output is exported via the second port and third port of i-th optical transmission module.Further, exist
In laser module 2 of the invention, optical transmission module 4 is configured to not allow the light pulse from posterior laser to return
It is input in preceding laser, it is ensured that injection locking process is interference-free.
Preferably, optical transmission module 4 may include circulator or polarization-maintaining beam splitting element.Wherein, circulator is selected to make
It is best for optical transmission module, laser can be prevented by from the undesirable of other lasers in simple structure at this time
Interference.Fig. 2 shows the laser modules 2 including single laser, correspondingly, in laser module 2 may include a light
Learn transmission module 4.Wherein, pilot tone light swashs via in the first port and second port injection laser 2 of optical transmission module 4
The laser pulse of light device 2 is transmitted via the second port and third port of optical transmission module towards zero-difference detection module 3.
Fig. 3 shows the laser module 2 including two lasers.As shown, laser module 2 includes first laser
Device 21 and second laser 22, and further include accordingly the first optical transmission module 41 and the second optical transmission module 42.Wherein, exist
In first order injection locking excitation process, pilot tone light is injected via the first port and second port of the first optical transmission module 41
In first laser device 21, first laser device 21 export first laser device pulse via the first optical transmission module 41 second end
Mouth and third port export outward, form the seed light that excitation process is locked for second level injection.It injects and locks in the second level
In excitation process, first laser device pulse swashs via first port and the second port injection second of the second optical transmission module 42
In light device 22, the second laser pulse that second laser 22 exports is via the second port of the second optical transmission module 42 and the
Three ports export outward, use as local local oscillator light.
Fig. 4 shows the laser module including n laser.As shown, laser module 2 includes first laser device
21, second laser 22 ..., the n-th laser 2n, and accordingly further includes the first optical transmission module 41, the second optical delivery mould
Block 42 ..., the n-th optical transmission module 4n.Wherein, it is injected in locking excitation process in the first order, pilot tone light is via the first optics
In first port and second port the injection first laser device 21 of transmission module 41, the first laser device of the output of first laser device 21
Pulse exports outward via the second port and third port of the first optical transmission module 41, injects locking excitation as the second level
Seed light.It is injected in locking excitation process in the second level, first laser device pulse is via the of the second optical transmission module 42
In Single port and second port injection second laser 22, the second laser pulse that second laser 22 exports is via the second light
The second port and third port for learning transmission module 42 export outward, and the seed light of locking excitation is injected as the second level.Successively
Analogize, in n-th grade of injection locking excitation process, (n-1)th laser pulse via the n-th optical transmission module 4n first end
Mouth and the n-th laser pulse of second port injection the n-th laser 2n, the n-th laser 2n output are via the n-th optical transmission module
The second port and third port of 4n exports outward, uses as local local oscillator light.
Further, decoding apparatus can also include Postponement module, for making local local oscillator light and signal light while reaching
Zero-difference detection module 3, so that coherent interference effect occurs, to detect to the coherent interference result.
Further, decoding apparatus can also include seed light intensity detection module, be injected into laser module 2 for detecting
Pilot tone light intensity can reach injection locking requirement, and generate decoding apparatus at clock signal.Show as one
Example, seed light intensity detection module may include the second beam splitting module and light intensity detector module, wherein the second beam splitting module is used for
Pilot tone light is separated a part of light to use so that light intensity detector module detects.Preferably, the second beam splitting module may include protecting
Inclined beam splitting element, such as polarization-maintaining beam splitter.
Coding/decoding method of the invention is explained below, to further illustrate the working principle of decoding apparatus of the invention.Tool
For body, coding/decoding method of the invention be may comprise steps of.
Combined beam light receiving step: the combined beam light sent by the end Alice is received comprising pilot tone light and signal light.Pilot tone light
Two components of same pulsed light are derived from signal light, wherein pilot tone light can have relatively large intensity, and signal light can
With relatively small intensity and to carry quantum key information.
Combined beam light spectroscopic step: separate pilot tone light and signal light in combined beam light to transmit along different light paths.
Local local oscillator photogenerated step: local via level-one or multistage injection locking excitation process generation based on pilot tone light
Local oscillator light.
Coherent detection step: make local local oscillator light and signal light that coherent interference effect occur, and to the coherent interference knot
Fruit is detected.
It preferably, can be by polarization-maintaining polarization beam splitting element (such as polarization-maintaining polarization beam splitting in combined beam light separating step
Device) Lai Shixian pilot tone light and signal light separation.
Preferably, in local local oscillator photogenerated step, the free oscillation frequency of laser and the kind for being used for the laser
Difference on the frequency between sub-light meets the range that injection locking requires, so that the local oscillator ray laser oscillation in laser can be entirely to infuse
The seed light entered is controlled, so that the frequency of local oscillator light laser oscillation mode is locked into the frequency of the seed light of injection, and
The seed phototiming of phase and injection.
It is highly preferred that the laser pulse in laser and between the seed light for the laser in pulse width and phase
To delay on can be configured to meet: within a system period, the seed light of injection laser can cover in time
Laser pulse.By this set, laser pulse is possibly based on amplitude in seed optical pulse and smoothly partially generates, from
And it obtains performance and preferably injects locking stimulation effect.
By above-mentioned coding/decoding method, being able to solve existing coding/decoding method and being difficult to adjust local laser makes itself and pilot tone light wave
It grows consistent, line width and leads to phase noise and cross the excessive technical problem of noise, improve into code rate, while reducing decoding apparatus
Optical element quantity and optical texture complexity.
In another aspect of this invention, a kind of continuous variable quantum key distribution system is also disclosed, this is provided with
The decoding apparatus of invention.
In still another aspect of the invention, a kind of continuous variable quantum key delivering method is also disclosed, including this hair
Bright coding/decoding method.
Although being described in detail above in conjunction with attached drawing by specific embodiment of the invention for continuous variable quantum key
Decoding apparatus, method and the dissemination system of distribution, but it will be readily appreciated by those skilled in the art that above-described embodiment is only example
Property, for illustrating the principle of the present invention, the scope of the present invention can't be caused to limit, those skilled in the art can be right
Above-described embodiment carries out various combinations, modification and equivalent replacement, without departing from the spirit and scope of the present invention.
Claims (13)
1. a kind of decoding apparatus for continuous variable quantum key distribution, including beam splitting module (1), laser module (2) and
Zero-difference detection module (3), it is characterised in that:
The beam splitting module (1) is for receiving the combined beam light including pilot tone light and signal light, and by the institute in the combined beam light
State pilot tone light and signal light separation, wherein the pilot tone light and the signal optical source in the combined beam light are in same arteries and veins
It washes off；
The laser module (2) includes n laser, and is locked based on the pilot tone light as seed light via injection
The mode of excitation generates local local oscillator light, and wherein n is the natural number greater than zero；Also,
The zero-difference detection module (3) is used to receive the local local oscillator light and the signal light, and to the local local oscillator
The coherent interference result of light and the signal light is detected.
2. decoding apparatus as described in claim 1, wherein the beam splitting module (1) includes polarization-maintaining polarization beam splitting element.
3. decoding apparatus as described in claim 1, wherein the zero-difference detection module (3) includes a zero-difference detection device.
4. decoding apparatus as described in claim 1, wherein the laser pulse of the laser be used for the laser
Seed light between be configured to meet in pulse width and relative time delay: within a system period, inject the laser
The seed light of device can cover the laser pulse of the laser in time.
5. decoding apparatus as described in claim 1, wherein the laser module (2) further includes n optical transmission module
(4)。
6. decoding apparatus as claimed in claim 5, the optical transmission module (4) includes three ports and is configured to: being used
In i-th of laser (2i) seed light through the first port and second port of i-th of optical transmission module (4i)
It injects in i-th of laser (2i), the laser pulse of i-th of laser (2i) output is via i-th of the light
The second port and third port output of transmission module (4i) are learned, wherein i=1 ..., n.
7. decoding apparatus as claimed in claim 6, wherein the optical transmission module is configured to not allow from posterior
The light pulse of the laser, which returns, to be inputted in the preceding laser.
8. decoding apparatus as claimed in claim 6, wherein the optical transmission module (4) includes circulator.
9. a kind of coding/decoding method for continuous variable quantum key distribution comprising,
Combined beam light receiving step: the combined beam light sent by the end Alice is received comprising pilot tone light and signal light, wherein described lead
Frequency light and the signal light are derived from two components of same pulsed light；
Combined beam light spectroscopic step: separate the pilot tone light and the signal light in the combined beam light to pass along different light paths
It is defeated；
Local local oscillator photogenerated step: based on the pilot tone light as seed light via level-one or multistage injection locking excitation
Process generates local local oscillator light；And
Coherent detection step: make the intrinsic light in the local and the signal light that coherent interference occur, and to the coherent interference knot
Fruit is detected.
10. coding/decoding method as claimed in claim 9, wherein in the combined beam light separating step, pass through polarization-maintaining polarization beam splitting
Element separates the pilot tone light and the signal light.
11. coding/decoding method as claimed in claim 9, wherein in the intrinsic photogenerated step in the local, swashing in laser
Light device pulse and for being configured to meet in pulse width and relative time delay between the seed light of the laser: at one
In the system period, the seed light for injecting the laser can cover the laser pulse of the laser in time.
12. coding/decoding method as claimed in claim 9, wherein in the coherent detection step, utilize single zero-difference detection device
The coherent interference result is detected.
13. a kind of continuous variable quantum key distribution system comprising as decoding of any of claims 1-8 fills
It sets.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112332974A (en) * | 2020-10-29 | 2021-02-05 | 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所） | Quantum key distribution system and method |
| CN112887092A (en) * | 2020-11-16 | 2021-06-01 | 南京大学 | Local oscillator four-state quantum key distribution method and system |
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| CN112332974B (en) * | 2020-10-29 | 2022-08-05 | 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所） | Quantum key distribution system and method |
| CN112887092A (en) * | 2020-11-16 | 2021-06-01 | 南京大学 | Local oscillator four-state quantum key distribution method and system |
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