CN106357399B - A kind of quantum key distribution light source monitoring device and its monitoring method - Google Patents
A kind of quantum key distribution light source monitoring device and its monitoring method Download PDFInfo
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- CN106357399B CN106357399B CN201610957366.7A CN201610957366A CN106357399B CN 106357399 B CN106357399 B CN 106357399B CN 201610957366 A CN201610957366 A CN 201610957366A CN 106357399 B CN106357399 B CN 106357399B
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 38
- 238000012806 monitoring device Methods 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 25
- 230000003287 optical effect Effects 0.000 claims abstract description 100
- 238000001514 detection method Methods 0.000 claims abstract description 35
- 230000033228 biological regulation Effects 0.000 claims abstract description 10
- 230000010287 polarization Effects 0.000 abstract description 14
- 238000010586 diagram Methods 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 101100028789 Arabidopsis thaliana PBS1 gene Proteins 0.000 description 2
- 101100139907 Arabidopsis thaliana RAR1 gene Proteins 0.000 description 2
- 101150098959 MON1 gene Proteins 0.000 description 2
- 101100291875 Neurospora crassa (strain ATCC 24698 / 74-OR23-1A / CBS 708.71 / DSM 1257 / FGSC 987) apg-13 gene Proteins 0.000 description 2
- 101100028790 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) PBS2 gene Proteins 0.000 description 2
- 230000001427 coherent effect Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 238000010200 validation analysis Methods 0.000 description 1
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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
- 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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- Optical Communication System (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The present invention provides a kind of quantum key distribution light source monitoring device and its monitoring methods, wherein device includes the adjustable attenuator connecting with polarized light source being arranged in the optical path of each polarized light source respectively, the beam splitter connecting with adjustable attenuator and the power detection mouth connecting with beam splitter, wherein: beam splitter, optical signal for exporting polarized light source separate it is a branch of, to carry out light source monitoring；Power detection mouth for converting optical signals to analog electrical signal, and calculates the power of analog electrical signal；Adjustable attenuator, the decaying of the optical signal for being exported for user according to the power regulation polarized light source of analog signal, with real-time control polarized light source.The present invention can accurately distinguish the shake of light source from which of four polarization direction light sources, and the decaying for the light source shaken can be adjusted with Real-time Feedback, the interruption for avoiding quantum key distribution caused by any light source shake all the way, improves the efficiency of key distribution.
Description
Technical field
The invention belongs to quantum key distribution technical field more particularly to a kind of quantum key distribution light source monitoring device and
Its monitoring method.
Background technique
Quantum communications are the products that quantum-mechanical and information theory combines, quantum key distribution be in quantum communications the most
Close to practical direction.Quantum key distribution is mainly that the coding of photon polarization state is utilized to transmit key information.Currently, by
The quantum key distribution that BB84 agreement develops requires single-photon source, and the inseparability and non-reproduction of single photon can
To guarantee the safety of quantum key distribution.
However, being all not present since technology limits ideal single-photon source, it is generally used weak phase in the prior art
Dry light source replaces ideal list light source carrying out quantum key distribution.By theoretical validation, acted on behalf of using weak coherent light source ideal
Single-photon source also can guarantee the safety of quantum key distribution in certain condition, but be the need to ensure that weak coherent light source
Average photon number at 1 hereinafter, and in key distribution procedure light source fluctuation no more than 5%, therefore, in quantum key
The average photon number for monitoring light source during distribution in real time becomes an indispensable technology for realizing quantum key distribution.
It is shown in Figure 1, the technology of quantum key distribution light source is monitored at present, is by one before light source complete attenuation
Beam splitter draws a power detection mouth and carries out personal monitoring, when light source fluctuation is more than 5%, that is, stops the distribution of key, this
Kind of monitor mode cannot distinguish between the shake of light source from which of four polarization direction light sources, can not be according to power detection mouth
The power detected carrys out the light source that real-time feedback control is shaken, and leads to the inefficiency of quantum key distribution.
Summary of the invention
The embodiment of the present invention is designed to provide a kind of quantum key distribution light source monitoring device and its monitoring method, purport
It cannot distinguish between the shake of light source from four polarization direction light in the monitor mode for solving existing quantum key distribution light source
Which of source, the light source that can not be shaken according to the power that power detection mouth detects come real-time feedback control, the amount of causing
The problem of inefficiency of quantum key distribution.
The embodiments of the present invention are implemented as follows, a kind of quantum key distribution light source monitoring device, including respectively each
The adjustable attenuator being connect with the polarized light source being arranged in the optical path of polarized light source, point being connect with the adjustable attenuator
Beam device and the power detection mouth being connect with the beam splitter, in which:
The beam splitter, the optical signal for exporting the polarized light source separate it is a branch of, to carry out light source monitoring；
The power detection mouth for the optical signal to be converted to analog electrical signal, and calculates the analog telecommunications
Number power；
The adjustable attenuator, for what is exported for user's polarized light source according to the power regulation of the analog signal
The decaying of optical signal, with polarized light source described in real-time control.
Based on the above technical solution, it is additionally provided in the optical path of each polarized light source and is connected to the power detection
Controller between mouth and the adjustable attenuator, in which:
The controller, for judging whether the power of the analog signal meets preset requirement, if not meeting default want
It asks, then the adjustable attenuator according to the power control of the analog signal adjusts declining for the optical signal of the polarized light source output
Subtract.
Based on the above technical solution, the controller is specifically used for:
Judge whether the power of the analog signal is equal to predetermined power threshold value, if being not equal to predetermined power threshold value, root
Adjustable attenuator described in power control according to the analog signal adjusts the decaying of the optical signal of the polarized light source output, makes to decline
The power of analog electrical signal corresponding to optical signal after subtracting is equal to the predetermined power threshold value.
Based on the above technical solution, if the predetermined power threshold value is Pt, there is Pt=hcfpA/ λ；
Wherein, h is planck constant, and c is the light velocity, and f is the frequency of polarized light source, and λ is the wavelength of polarized light source, and A is institute
The fixation light decrement of the optical signal of optical path where stating polarized light source, p are the average photon number of preset each light-pulse generator.
Based on the above technical solution, the value range of the average photon number of preset each light-pulse generator is
Positive number less than 1.
The another object of the embodiment of the present invention is to provide a kind of monitoring method of quantum key distribution light source monitoring device,
Wherein, the quantum key distribution light source monitoring device include be arranged in the optical path of each polarized light source respectively with it is described partially
Adjustable attenuator, the beam splitter being connect with the adjustable attenuator and the power being connect with the beam splitter that the light source that shakes connects
Detection mouth, the monitoring method include:
The optical signal that polarized light source described in each optical path exports is separated one respectively by the beam splitter in each optical path
Beam, to carry out light source monitoring；
The optical signal that each polarized light source exports is converted into simulation electricity respectively by the power detection mouth in each optical path
Signal, and calculate the power of each analog electrical signal；
It is defeated according to each polarized light source of power regulation of each analog signal respectively by the adjustable attenuator in each optical path
The decaying of optical signal out, with each polarized light source of real-time control.
Based on the above technical solution, it is additionally provided in the optical path of each polarized light source and is connected to the power detection
Controller mouthful between the adjustable attenuator, wherein the adjustable attenuator by each optical path basis respectively
The decaying of the optical signal of each polarized light source output of the power regulation of each analog signal, is specifically wrapped with each polarized light source of real-time control
It includes:
Judge whether the power of the analog signal meets preset requirement by the controller, if not meeting default want
It asks, then the adjustable attenuator according to the power control of the analog signal adjusts declining for the optical signal of the polarized light source output
Subtract.
Based on the above technical solution, described to judge whether the power of the analog signal accords with by the controller
Preset requirement is closed, if not meeting preset requirement, institute is adjusted according to adjustable attenuator described in the power control of the analog signal
The decaying for stating the optical signal of polarized light source output specifically includes:
Judge whether the power of the analog signal is equal to predetermined power threshold value, if being not equal to predetermined power threshold value, root
Adjustable attenuator described in power control according to the analog signal adjusts the decaying of the optical signal of the polarized light source output, makes to decline
The power of analog electrical signal corresponding to optical signal after subtracting is equal to the predetermined power threshold value.
Based on the above technical solution, if the predetermined power threshold value is Pt, there is Pt=hcfpA/ λ；
Wherein, h is planck constant, and c is the light velocity, and f is the frequency of polarized light source, and λ is the wavelength of polarized light source, and A is institute
The fixation light decrement of the optical signal of optical path where stating polarized light source, p are the average photon number of preset each light-pulse generator.
Based on the above technical solution, the value range of the average photon number of preset each light-pulse generator is
Positive number less than 1.
Implement a kind of quantum key distribution light source monitoring device provided in an embodiment of the present invention and its monitoring method and have with
It is lower the utility model has the advantages that
The embodiment of the present invention by respectively in the optical path of each polarized light source setting connect with the polarized light source can
Controlled attenuator, the beam splitter being connect with the adjustable attenuator, the power detection mouth being connect with the beam splitter and with it is described
The controller that power detection mouth is connected with the adjustable attenuator, in which: the beam splitter, for the polarized light source to be exported
Optical signal separate it is a branch of, to carry out light source monitoring；The power detection mouth, for the optical signal to be converted to simulation electricity
Signal, and calculate the power of the analog electrical signal；The adjustable attenuator, for for user according to the analog signal
The decaying of the optical signal of the output of polarized light source described in power regulation, with polarized light source described in real-time control, so as in light source
The shake of light source is accurately distinguished when fluctuating larger from which of four polarization direction light sources, and can be by adjustable
Attenuator adjusts the decaying for the light source shaken according to the power that power detection mouth where the light source detects come Real-time Feedback,
The interruption for avoiding quantum key distribution caused by any light source shake all the way, improves the efficiency of key distribution.
Detailed description of the invention
Fig. 1 is a kind of application schematic diagram for quantum key distribution light source monitoring device that the prior art provides；
Fig. 2 is a kind of application schematic diagram of quantum key distribution light source monitoring device provided in an embodiment of the present invention；
Fig. 3 be another embodiment of the present invention provides a kind of quantum key distribution light source monitoring device application schematic diagram；
Fig. 4 is a kind of signal stream of the monitoring method of quantum key distribution light source monitoring device provided in an embodiment of the present invention
Cheng Tu；
Fig. 5 be another embodiment of the present invention provides the monitoring method of quantum key distribution light source monitoring device a kind of show
Meaning flow chart.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Fig. 1 is a kind of application schematic diagram for quantum key distribution light source monitoring device that the prior art provides.Referring to Fig. 1 institute
Show, quantum key distribution system includes horizontal polarization light source " V ", vertical polarization light source " H ", right oblique 45 degree of polarized light source "+", left sides
Oblique 45 degree of polarized light source "-", the first polarization beam apparatus PBS1, the second polarization beam apparatus PBS2, half-wave plate HWP, total beam splitter BS
And complete attenuation device F-ATT, wherein horizontal polarization light source " V " and vertical polarization light source " H " are defeated through the second polarization beam apparatus PBS2
Enter to a branch of total beam splitter, right oblique 45 degree of polarized light source "+" and left oblique 45 degree of polarized light source "-" are through the first polarization point
Beam device PBS1 and half-wave plate HWP is input to another branch of total beam splitter BS, is carried out two branch optical signals by total score device BS
Quantum key distribution is carried out again after complete attenuation device F-ATT decays to total light signal again after summarizing.Existing quantum is close
Key distribution light source monitoring method is directly to draw a power detection mouth MON in the output end of total beam splitter to carry out personal monitoring,
When the light source fluctuation of total beam splitter BS output end is more than 5%, that is, stop the distribution of key, this monitor mode cannot distinguish between light
The shake in source, can not be according to the power that power detection mouth detects come anti-in real time from which of four polarization direction light sources
The light source that feedback control is shaken, leads to the inefficiency of quantum key distribution.
In order to overcome drawbacks described above existing for existing quantum distribution light source monitoring method, the embodiment of the invention provides one
Kind quantum key distribution light source monitoring device.Fig. 2 shows a kind of quantum key distribution light source prisons provided in an embodiment of the present invention
Control the application schematic diagram of device.It illustrate only part related to the present embodiment for ease of description.
Shown in Figure 2, a kind of quantum key distribution light source monitoring device provided in this embodiment includes respectively each
Adjustable attenuator R-ATT1~the R-ATT4 being connect with the polarized light source that is arranged in the optical path of polarized light source, respectively with it is described
It beam splitter BS1~BS4 of adjustable attenuator R-ATT1~R-ATT4 connection and is connect respectively with the beam splitter BS1~BS4
Power detection mouth MON1~MON4, in which:
Beam splitter BS1~the BS4, the optical signal for exporting the polarized light source separate it is a branch of, to carry out light
Source monitoring；
The power detection mouth MON1~MON4 for the optical signal to be converted to analog electrical signal, and calculates institute
State the power of analog electrical signal；
Adjustable attenuator R-ATT1~the R-ATT4, for for user according to the power regulation of the analog signal
The decaying of the optical signal of polarized light source output, with polarized light source described in real-time control.
In the present embodiment, between polarized light source and adjustable attenuator, between adjustable attenuator and beam splitter, beam splitter with
It can be connected by optical fibre device or free space between power detection mouth.
A kind of light of the quantum key distribution light source monitoring device provided in this embodiment as where in every road polarized light source
Lu Zhongjun introduces a power detection mouth, therefore can be separately monitored respectively to every road polarized light source, to distinguish
Which light source is shaken, and can be to adjust as being provided with one in the optical path where every road polarized light source
The adjustable attenuator of light source attenuation is saved, therefore it is real according to the monitoring result in each optical path by adjustable attenuator that family can be used
When adjust the decaying of polarized light source in each optical path so that its requirement for meeting quantum key distribution, and then can be to avoid appointing
What all the way light source shake caused by quantum key distribution interruption, improve key distribution efficiency.
Fig. 3 show another embodiment of the present invention provides a kind of quantum key distribution light source monitoring device application signal
Figure.It illustrate only part related to the present embodiment for ease of description.
It is shown in Figure 3, relative to a upper embodiment, a kind of quantum magic potion distribution light source monitoring dress provided in this embodiment
Set further include each polarized light source optical path on be arranged be connected between the power detection mouth and the adjustable attenuator
Controller CPU1~CPU4, in which:
Controller CPU1~the CPU4, for judging whether the power of the analog signal meets preset requirement, if not
Meet preset requirement, then the adjustable attenuator according to the power control of the analog signal adjusts the polarized light source output
The decaying of optical signal.
Further, the controller CPU1~CPU4 is specifically used for:
Judge whether the power of the analog signal is equal to predetermined power threshold value, if being not equal to predetermined power threshold value, root
Adjustable attenuator described in power control according to the analog signal adjusts the decaying of the optical signal of the polarized light source output, makes to decline
The power of analog electrical signal corresponding to optical signal after subtracting is equal to the predetermined power threshold value.
Further, if the predetermined power threshold value is Pt, there is Pt=hcfpA/ λ；
Wherein, h is planck constant, and c is the light velocity, and f is the frequency of polarized light source, and λ is the wavelength of polarized light source, and A is institute
The fixation light decrement of the optical signal of optical path where stating polarized light source, p are the average photon number of preset each light-pulse generator.
Further, the value range of the average photon number of preset each light-pulse generator is the positive number less than 1.It is excellent
Choosing, in the present embodiment, the average photon number of preset each light-pulse generator is 0.1, can make weak phase in this way
Dry light source is closest to ideal single-photon source.
In the present embodiment, it is provided with one in the optical path as where in each polarized light source and is connected to power detection mouth
Controller between adjustable attenuator, therefore can be realized by the controller according to power detection in every optical path
The Feedback of Power of mouth output controls the attenuation that the adjustable attenuator adjusts polarized light source, so that the polarised light in each optical path
Source is all satisfied the purpose of the requirement of quantum key distribution, adjustable attenuator is manually controlled without user, accordingly, with respect to upper one
Embodiment, it is more efficient, and real-time is more preferable.
It should be noted that the other component in a kind of quantum key distribution light source monitoring device provided in this embodiment is equal
Identical as in monitoring device provided by embodiment illustrated in fig. 2, therefore, details are not described herein.
Thus, it will be seen that a kind of quantum key distribution light source monitoring device provided in this embodiment can equally be distinguished
It is which light source is shaken, and adjustable attenuator can be automatically controlled by controller according in each optical path out
Monitoring result adjusts the decaying of the polarized light source in each optical path in real time, so that its requirement for meeting quantum key distribution, in turn
The efficiency of key distribution can be improved to avoid the interruption of quantum key distribution caused by any light source shake all the way.
Fig. 4 is a kind of signal stream of the monitoring method of quantum key distribution light source monitoring device provided in an embodiment of the present invention
Cheng Tu, the executing subject of this method are the monitoring devices that embodiment illustrated in fig. 2 provides.It is shown in Figure 4, it is provided in this embodiment
A kind of monitoring method of quantum key distribution light source monitoring device includes:
In S401, the light by the beam splitter in each optical path respectively by polarized light source described in each optical path output is believed
Number separate it is a branch of, to carry out light source monitoring.
In S402, converted by the optical signal that the power detection mouth in each optical path respectively exports each polarized light source
For analog electrical signal, and calculate the power of each analog electrical signal.
It is each partially according to the power regulation of each analog signal respectively by the adjustable attenuator in each optical path in S403
The decaying of the optical signal for light source output of shaking, with each polarized light source of real-time control.
A kind of monitoring method of quantum key distribution light source monitoring device provided in this embodiment is due in every road polarised light
A power detection mouth is introduced in optical path where source, therefore every road polarized light source can be separately monitored respectively,
Which shaken to distinguish light source, and as being provided with one in the optical path where every road polarized light source
It can be to adjust the adjustable attenuator of light source attenuation, therefore family can be used by adjustable attenuator according in each optical path
Monitoring result adjusts the decaying of the polarized light source in each optical path in real time, so that its requirement for meeting quantum key distribution, in turn
The efficiency of key distribution can be improved to avoid the interruption of quantum key distribution caused by any light source shake all the way.
Fig. 5 be another embodiment of the present invention provides the monitoring method of quantum key distribution light source monitoring device a kind of show
Meaning flow chart, the executing subject of this method are the monitoring devices that embodiment illustrated in fig. 3 provides.Shown in Figure 5, the present embodiment mentions
The monitoring method of a kind of quantum key distribution light source monitoring device supplied includes:
In S501, the light by the beam splitter in each optical path respectively by polarized light source described in each optical path output is believed
Number separate it is a branch of, to carry out light source monitoring.
In S502, converted by the optical signal that the power detection mouth in each optical path respectively exports each polarized light source
For analog electrical signal, and calculate the power of each analog electrical signal.
In S503, judge whether the power of the analog signal meets preset requirement by the controller, if not being inconsistent
Preset requirement is closed, then the adjustable attenuator according to the power control of the analog signal adjusts the light of the polarized light source output
The decaying of signal.
In the present embodiment, step S503 is specifically included:
Judge whether the power of the analog signal is equal to predetermined power threshold value, if being not equal to predetermined power threshold value, root
Adjustable attenuator described in power control according to the analog signal adjusts the decaying of the optical signal of the polarized light source output, makes to decline
The power of analog electrical signal corresponding to optical signal after subtracting is equal to the predetermined power threshold value.
Further, if the predetermined power threshold value is Pt, there is Pt=hcfpA/ λ；
Wherein, h is planck constant, and c is the light velocity, and f is the frequency of polarized light source, and λ is the wavelength of polarized light source, and A is institute
The fixation light decrement of the optical signal of optical path where stating polarized light source, p are the average photon number of preset each light-pulse generator.
Further, the value range of the average photon number of preset each light-pulse generator is the positive number less than 1.It is excellent
Choosing, in the present embodiment, the average photon number of preset each light-pulse generator is 0.1, can make weak phase in this way
Dry light source is closest to ideal single-photon source.
In the present embodiment, it is provided with one in the optical path as where in each polarized light source and is connected to power detection mouth
Controller between adjustable attenuator, therefore can be realized by the controller according to power detection in every optical path
The Feedback of Power of mouth output controls the attenuation that the adjustable attenuator adjusts polarized light source, so that the polarised light in each optical path
Source is all satisfied the purpose of the requirement of quantum key distribution, adjustable attenuator is manually controlled without user, accordingly, with respect to upper one
Embodiment, it is more efficient, and real-time is more preferable.
Thus, it will be seen that a kind of monitoring method of quantum key distribution light source monitoring device provided in this embodiment is same
Sample, which can be distinguished, is which light source is shaken, and can be automatically controlled by controller adjustable attenuator according to
Monitoring result in each optical path adjusts the decaying of the polarized light source in each optical path in real time, so that it meets quantum key distribution
It is required that and then key distribution can be improved to avoid the interruption of quantum key distribution caused by any light source shake all the way
Efficiency.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (4)
1. a kind of quantum key distribution light source monitoring device, which is characterized in that including respectively in the optical path of each polarized light source
The adjustable attenuator being connect with the polarized light source being arranged, the beam splitter being connect with the adjustable attenuator and with it is described
The power detection mouth of beam splitter connection, in which:
The beam splitter, the optical signal for exporting the polarized light source separate it is a branch of, to carry out light source monitoring；
The power detection mouth for the optical signal to be converted to analog electrical signal, and calculates the analog electrical signal
Power；
The adjustable attenuator, the light letter for being exported for user's polarized light source according to the power regulation of the analog signal
Number decaying, with polarized light source described in real-time control；
The control being connected between the power detection mouth and the adjustable attenuator is additionally provided in the optical path of each polarized light source
Device processed, in which:
The controller, for judging whether the power of the analog signal is equal to predetermined power threshold value, if not equal to default function
Rate threshold value, then the adjustable attenuator according to the power control of the analog signal adjusts the optical signal of the polarized light source output
Decaying, make decaying after optical signal corresponding to analog electrical signal power be equal to the predetermined power threshold value；
If the predetermined power threshold value is Pt, there is Pt=hcfpA/ λ；
Wherein, h is planck constant, and c is the light velocity, and f is the frequency of polarized light source, and λ is the wavelength of polarized light source, and A is described inclined
The fixation light decrement of the optical signal for light source place optical path of shaking, p is the average photon number of preset each light-pulse generator.
2. quantum key distribution light source monitoring device as described in claim 1, which is characterized in that preset each pulse
The value range of the average photon number of light source is the positive number less than 1.
3. a kind of monitoring method of quantum key distribution light source monitoring device, which is characterized in that the quantum key distribution light source
Monitoring device include the adjustable attenuator being connect with the polarized light source being arranged in the optical path of each polarized light source respectively, with
The beam splitter of the adjustable attenuator connection and the power detection mouth being connect with the beam splitter, wherein the monitoring method
Include:
The optical signal that polarized light source described in each optical path exports is separated to a branch of, use respectively by the beam splitter in each optical path
To carry out light source monitoring；
The optical signal that each polarized light source exports is converted into analog electrical signal respectively by the power detection mouth in each optical path,
And calculate the power of each analog electrical signal；
By the adjustable attenuator in each optical path respectively according to each polarized light source output of the power regulation of each analog signal
The decaying of optical signal, with each polarized light source of real-time control；
The control being connected between the power detection mouth and the adjustable attenuator is additionally provided in the optical path of each polarized light source
Device processed, wherein the adjustable attenuator by each optical path is respectively polarized according to the power regulation of each analog signal respectively
The decaying of the optical signal of light source output is specifically included with each polarized light source of real-time control:
Judge whether the power of the analog signal is equal to predetermined power threshold value, if being not equal to predetermined power threshold value, according to institute
The decaying that adjustable attenuator described in the power control of analog signal adjusts the optical signal of the polarized light source output is stated, after making decaying
Optical signal corresponding to analog electrical signal power be equal to the predetermined power threshold value；
If the predetermined power threshold value is Pt, there is Pt=hcfpA/ λ；
Wherein, h is planck constant, and c is the light velocity, and f is the frequency of polarized light source, and λ is the wavelength of polarized light source, and A is described inclined
The fixation light decrement of the optical signal for light source place optical path of shaking, p is the average photon number of preset each light-pulse generator.
4. monitoring method as claimed in claim 3, which is characterized in that the average photon number of preset each light-pulse generator
Value range be positive number less than 1.
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| CN201610957366.7A CN106357399B (en) | 2016-10-26 | 2016-10-26 | A kind of quantum key distribution light source monitoring device and its monitoring method |
| PCT/CN2017/100908 WO2018076936A1 (en) | 2016-10-26 | 2017-09-07 | Device for monitoring quantum key distribution light source and monitoring method thereof |
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| CN201610957366.7A CN106357399B (en) | 2016-10-26 | 2016-10-26 | A kind of quantum key distribution light source monitoring device and its monitoring method |
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| CN106357399B (en) * | 2016-10-26 | 2019-09-24 | 深圳市太赫兹科技创新研究院有限公司 | A kind of quantum key distribution light source monitoring device and its monitoring method |
| CN110620616B (en) * | 2018-12-18 | 2023-01-31 | 科大国盾量子技术股份有限公司 | Weak coherent light source device and quantum key distribution system |
| CN111526004B (en) * | 2019-02-03 | 2022-04-12 | 科大国盾量子技术股份有限公司 | Transmitting device, receiving device and related system of quantum key distribution system |
| CN112929159B (en) * | 2019-12-06 | 2022-07-05 | 北京中创为南京量子通信技术有限公司 | Encoding device and method in quantum key distribution system |
| CN111307282B (en) * | 2020-02-24 | 2021-06-29 | 四川九洲电器集团有限责任公司 | Single photon source preparation system and method |
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| US7242775B2 (en) * | 2003-11-12 | 2007-07-10 | Magiq Technologies, Inc. | Optical pulse calibration for quantum key distribution |
| CN101150371B (en) * | 2006-09-22 | 2012-02-29 | 中国科学院物理研究所 | A quanta secret key distribution system for phase coding polarization detection |
| US8433070B2 (en) * | 2010-05-17 | 2013-04-30 | Raytheon Bbn Technologies Corp. | Systems and methods for stabilization of interferometers for quantum key distribution |
| CN102223181A (en) * | 2011-06-16 | 2011-10-19 | 安徽问天量子科技股份有限公司 | Control method of electrical variable optical attenuator and optical attenuation system |
| WO2013179094A1 (en) * | 2012-05-31 | 2013-12-05 | Nokia Corporation | Secured wireless communications |
| CN102724036B (en) * | 2012-06-04 | 2015-01-14 | 上海交通大学 | Continuous variable quantum key distribution system and synchronous realization method thereof |
| CN102820968B (en) * | 2012-07-10 | 2016-04-20 | 中国电力科学研究院 | Based on quantum key distribution transformer station between measurement and control signal one-time pad transmission system |
| CN102916807B (en) * | 2012-10-12 | 2015-05-20 | 上海交通大学 | Polarization compensation implementation method of continuous variable quantum key distribution system |
| CN102983962A (en) * | 2012-12-04 | 2013-03-20 | 上海朗研光电科技有限公司 | Polarization self-starting method for polarization encoding quantum secret key distribution system |
| CN104506305A (en) * | 2014-12-08 | 2015-04-08 | 北京大学 | Signal source monitoring device and method in quantum key distribution system |
| CN104780039B (en) * | 2015-03-19 | 2017-10-31 | 宁波大学 | A kind of polarization compensation implementation method in quantum key distribution |
| CN106357399B (en) * | 2016-10-26 | 2019-09-24 | 深圳市太赫兹科技创新研究院有限公司 | A kind of quantum key distribution light source monitoring device and its monitoring method |
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| WO2018076936A1 (en) | 2018-05-03 |
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