CN106357399A - Quantum key distribution light source monitoring device and monitoring method thereof - Google Patents
Quantum key distribution light source monitoring device and monitoring method thereof Download PDFInfo
- Publication number
- CN106357399A CN106357399A CN201610957366.7A CN201610957366A CN106357399A CN 106357399 A CN106357399 A CN 106357399A CN 201610957366 A CN201610957366 A CN 201610957366A CN 106357399 A CN106357399 A CN 106357399A
- Authority
- CN
- China
- Prior art keywords
- light source
- polarized light
- power
- key distribution
- optical signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Optics & Photonics (AREA)
- Theoretical Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Optical Communication System (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The invention provides a quantum key distribution light source monitoring device and a monitoring method thereof. The device comprises adjustable attenuators which are arranged on light paths of polarization light sources and are connected with the polarization light sources, beam splitters connected with the adjustable attenuators and power detection ports connected with the beam splitters, wherein the beam splitters are used for splitting beams from light signals output by the polarization light sources to monitor the light sources; the power detection ports are used for converting the light signals into analog electric signals and calculating power of the analog electric signals; and the adjustable attenuators are used by a user for adjusting attenuation of the light signals output by the polarization light sources according to the analog signals so as to control the polarization light sources in real time. The quantum key distribution light source monitoring device can accurately distinguish the one, which shakes, of the four polarization directional light sources and feed back and adjust the attenuation of the shaking light source in real time, so that interruption of quantum key distribution due to the shake of any light source is avoided, and the key distribution efficiency is improved.
Description
Technical field
The invention belongs to quantum key distribution technical field, more particularly, to a kind of quantum key distribution light source supervising device and
Its monitoring method.
Background technology
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 mainly uses the coding transmission key information of photon polarization state.At present, by
The quantum key distribution that bb84 agreement develops is required for single-photon source, and the inseparability of single photon and non-reproduction can
To ensure the safety of quantum key distribution.
However, not existed because technology limits preferable single-photon source, therefore in prior art, typically all adopt weak phase
Dry light source replaces preferable list light source carrying out quantum key distribution.Through theoretical validation, acted on behalf of preferable using weak coherent light source
Single-photon source also can ensure the safety of quantum key distribution in certain condition, however it is necessary that ensureing weak coherent light source
Average photon number is below 1, and in key distribution procedure, the fluctuation of light source not can exceed that 5%, therefore, in quantum key
During distribution, the average photon number of monitor in real time light source becomes an indispensable technology realizing quantum key distribution.
Shown in Figure 1, monitor the technology of quantum key distribution light source at present, be by before light source complete attenuation
Beam splitter is drawn a power detection mouth and is carried out personal monitoring, when light source fluctuation is more than 5%, that is, stops the distribution of key, this
Which in four polarization direction light sources the shake that kind of monitor mode cannot distinguish between light source come from it is impossible to according to power detection mouth
The power detecting carrys out the light source that real-time feedback control occurs shake, leads to the inefficiency of quantum key distribution.
Content of the invention
The purpose of the embodiment of the present invention is to provide a kind of quantum key distribution light source supervising device and its monitoring method, purport
The shake that cannot distinguish between light source in the monitor mode solving existing quantum key distribution light source comes from four polarization direction light
Which in source it is impossible to there is the light source of shake, the amount of leading in the power being detected according to power detection mouth come real-time feedback control
The problem of the inefficiency of quantum key distribution.
The embodiment of the present invention is achieved in that a kind of quantum key distribution light source supervising device, including respectively at each
What in the light path of polarized light source, the adjustable attenuator being connected with described polarized light source of setting was connected with described adjustable attenuator divides
Bundle device and the power detection mouth being connected with described beam splitter, wherein:
Described beam splitter, the optical signal for exporting described polarized light source separates a branch of, in order to enter line light source monitoring；
Described power detection mouth, for described optical signal is converted to analog electrical signal, and calculates described analog telecommunications
Number power；
Described adjustable attenuator, for the polarized light source output according to the power adjustments of described analogue signal for user
The decay of optical signal, with polarized light source described in real-time control.
On the basis of technique scheme, the light path of each polarized light source is additionally provided with and is connected to described power detection
Controller between mouth and described adjustable attenuator, wherein:
Described controller, whether the power for judging described analogue signal meets preset requirement, if not meeting default wanting
Ask, then adjustable attenuator described in the Power Control according to described analogue signal adjusts declining of the optical signal of described polarized light source output
Subtract.
On the basis of technique scheme, described controller specifically for:
Judge whether the power of described analogue signal is equal to predetermined power threshold value, if being not equal to predetermined power threshold value, root
Adjust the decay of the optical signal of described polarized light source output according to adjustable attenuator described in the Power Control of described analogue signal, make to decline
The power of the analog electrical signal corresponding to optical signal after subtracting is equal to described predetermined power threshold value.
On the basis of technique scheme, if described 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
State the fixing light decrement of the optical signal of polarized light source place light path, p is the average photon number of each light-pulse generator default.
On the basis of technique scheme, the span of the average photon number of described each light-pulse generator default 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 supervising device,
Wherein, described quantum key distribution light source supervising device include respectively in the light path of each polarized light source setting with described partially
Beam splitter and the power being connected with described beam splitter that the adjustable attenuator that the light source that shakes connects is connected with described adjustable attenuator
Detection mouth, described monitoring method includes:
Respectively the optical signal of polarized light source output described in each light path is separated one by the described beam splitter in each light path
Bundle, in order to enter line light source monitoring；
The optical signal of each polarized light source output is converted to respectively by simulation electricity by the described power detection mouth in each light path
Signal, and calculate the power of each analog electrical signal；
Defeated according to each polarized light source of power adjustments of each analogue signal respectively by the described adjustable attenuator in each light path
The decay of the optical signal going out, with each polarized light source of real-time control.
On the basis of technique scheme, the light path of each polarized light source is additionally provided with and is connected to described power detection
Mouthful and described adjustable attenuator between controller, wherein, described by the described adjustable attenuator basis respectively in each light path
The decay of the optical signal of power adjustments each polarized light source output of each analogue signal, is specifically wrapped with each polarized light source of real-time control
Include:
Whether preset requirement is met by the power that described controller judges described analogue signal, if not meeting default wanting
Ask, then adjustable attenuator described in the Power Control according to described analogue signal adjusts declining of the optical signal of described polarized light source output
Subtract.
On the basis of technique scheme, described whether accorded with by the power that described controller judges described analogue signal
Close preset requirement, if not meeting preset requirement, adjustable attenuator described in the Power Control according to described analogue signal adjusts institute
The decay stating the optical signal of polarized light source output specifically includes:
Judge whether the power of described analogue signal is equal to predetermined power threshold value, if being not equal to predetermined power threshold value, root
Adjust the decay of the optical signal of described polarized light source output according to adjustable attenuator described in the Power Control of described analogue signal, make to decline
The power of the analog electrical signal corresponding to optical signal after subtracting is equal to described predetermined power threshold value.
On the basis of technique scheme, if described 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
State the fixing light decrement of the optical signal of polarized light source place light path, p is the average photon number of each light-pulse generator default.
On the basis of technique scheme, the span of the average photon number of described each light-pulse generator default 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 have with
Lower beneficial effect:
The embodiment of the present invention pass through respectively in the light path of each polarized light source setting be connected with described polarized light source can
Power detection mouth that the beam splitter that controlled attenuator is connected with described adjustable attenuator is connected with described beam splitter and with described
Power detection mouth and the controller of described adjustable attenuator connection, wherein: described beam splitter, for described polarized light source is exported
Optical signal separate a branch of, in order to enter line light source monitoring；Described power detection mouth, for being converted to simulation electricity by described optical signal
Signal, and calculate the power of described analog electrical signal；Described adjustable attenuator, for for user according to described analogue signal
The decay of the optical signal of polarized light source output described in power adjustments, with polarized light source described in real-time control, such that it is able in light source
Which in four polarization direction light sources the shake accurately distinguishing light source when fluctuating larger come from it is possible to by adjustable
Attenuator adjusts the decay of the light source that shake occurs according to the power that this light source place power detection mouth detects come Real-time Feedback,
Avoid the interruption of the quantum key distribution caused by light source shake on any road, improve the efficiency of key distribution.
Brief description
Fig. 1 is a kind of application schematic diagram of quantum key distribution light source supervising device that prior art provides；
Fig. 2 is a kind of application schematic diagram of quantum key distribution light source supervising device provided in an embodiment of the present invention；
Fig. 3 is a kind of application schematic diagram of quantum key distribution light source supervising device that another embodiment of the present invention provides；
Fig. 4 is a kind of signal stream of the monitoring method of quantum key distribution light source supervising device provided in an embodiment of the present invention
Cheng Tu；
Fig. 5 is a kind of showing of the monitoring method of quantum key distribution light source supervising device that another embodiment of the present invention provides
Meaning flow chart.
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention become more apparent, below in conjunction with drawings and Examples, right
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only in order to explain the present invention, and
It is not used in the restriction present invention.
Fig. 1 is a kind of application schematic diagram of quantum key distribution light source supervising device that prior art provides.Referring to Fig. 1 institute
Show, quantum key distribution system include horizontal polarization light source " v ", vertical polarization light source " h ", right oblique 45 degree polarized light sources "+", a left side
Oblique 45 degree of polarized light sources " ", 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 " be defeated through the second polarization beam apparatus pbs2
Enter to a branch road of total beam splitter, right oblique 45 degree polarized light sources "+" and left oblique 45 degree of polarized light sources " " polarize through first and divide
Bundle device pbs1 and half-wave plate hwp inputs to another branch road of total beam splitter bs, is carried out two branch road optical signals by total score device bs
Carry out quantum key distribution again after total light signal being decayed through complete attenuation device f-att again after collecting.Existing quantum is close
Light source monitoring method distributed by key is directly to carry out personal monitoring in outfan one power detection mouth mon of extraction of total beam splitter,
When the light source fluctuation of total beam splitter bs outfan is more than 5%, that is, stop the distribution of key, this monitor mode cannot distinguish between light
Which in four polarization direction light sources the shake in source come from it is impossible to the power detecting according to power detection mouth is come anti-in real time
Feedback controls the light source that shake occurs, and leads to the inefficiency of quantum key distribution.
In order to overcome existing quantum to distribute the drawbacks described above that light source monitoring method exists, embodiments provide one
Plant quantum key distribution light source supervising device.Fig. 2 shows a kind of quantum key distribution light source prison provided in an embodiment of the present invention
The application schematic diagram of control device.Illustrate only part related to the present embodiment for convenience of description.
Shown in Figure 2, a kind of quantum key distribution light source supervising device that the present embodiment provides is included respectively at each
In the light path of polarized light source setting the adjustable attenuator r-att1～r-att4 being connected with described polarized light source, respectively with described
Beam splitter bs1～bs4 that adjustable attenuator r-att1～r-att4 connects and being connected with described beam splitter bs1～bs4 respectively
Power detection mouth mon1～mon4, wherein:
Described beam splitter bs1～bs4, the optical signal for exporting described polarized light source separates a branch of, in order to carry out light
Source monitors；
Described power detection mouth mon1～mon4, for described optical signal is converted to analog electrical signal, and calculates institute
State the power of analog electrical signal；
Described adjustable attenuator r-att1～r-att4, for for user according to the power adjustments of described analogue signal
The decay 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
Can be connected by optical fibre device or free space between power detection mouth.
A kind of quantum key distribution light source supervising device that the present embodiment provides is due to the light being located in every road polarized light source
Lu Zhongjun introduces a power detection mouth, therefore can respectively every road polarized light source be separately monitored, thus distinguishing
Which light source there occurs shake, and can be in order to adjust due to being provided with one in the light path at every road polarized light source place
The adjustable attenuator of section light source attenuation, therefore can make user pass through adjustable attenuator real according to the monitoring result in each light path
When adjust the decay of polarized light source in each bar light path so that it meets the requirement of quantum key distribution, and then can avoid appointing
The interruption of the quantum key distribution caused by light source shake of He Yilu, improves the efficiency of key distribution.
Fig. 3 shows that a kind of application of quantum key distribution light source supervising device that another embodiment of the present invention provides is illustrated
Figure.Illustrate only part related to the present embodiment for convenience of description.
Shown in Figure 3, with respect to a upper embodiment, a kind of quantum magic potion distribution light source monitoring dress that the present embodiment provides
Put in the light path also include each polarized light source being connected between described power detection mouth and described adjustable attenuator of setting
Controller cpu1～cpu4, wherein:
Described controller cpu1～cpu4, whether the power for judging described analogue signal meets preset requirement, if not
Meet preset requirement, then adjustable attenuator described in the Power Control according to described analogue signal adjusts described polarized light source output
The decay of optical signal.
Further, described controller cpu1～cpu4 specifically for:
Judge whether the power of described analogue signal is equal to predetermined power threshold value, if being not equal to predetermined power threshold value, root
Adjust the decay of the optical signal of described polarized light source output according to adjustable attenuator described in the Power Control of described analogue signal, make to decline
The power of the analog electrical signal corresponding to optical signal after subtracting is equal to described predetermined power threshold value.
Further, if described 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
State the fixing light decrement of the optical signal of polarized light source place light path, p is the average photon number of each light-pulse generator default.
Further, the span of the average photon number of described each light-pulse generator default is the positive number less than 1.Excellent
Choosing, in the present embodiment, the average photon number of described each light-pulse generator default is 0.1, so so that weak phase
Dry light source is closest to preferable single-photon source.
In the present embodiment, it is connected to power detection mouth due to being provided with one in the light path that each polarized light source is located
Controller and adjustable attenuator between, all can be realized according to power detection by described controller in therefore every light path
The Feedback of Power of mouth output controls described adjustable attenuator to adjust the attenuation of polarized light source, so that the polarized light in each bar light path
Source is satisfied by the purpose of the requirement of quantum key distribution, its without user's Non-follow control adjustable attenuator, accordingly, with respect to upper one
Embodiment, in hgher efficiency, and real-time is more preferable.
It should be noted that the miscellaneous part in a kind of quantum key distribution light source monitoring device of the present embodiment offer is equal
With identical in the monitoring device that embodiment illustrated in fig. 2 is provided, therefore, will not be described here.
Thus, it will be seen that a kind of quantum key distribution light source monitoring device that the present embodiment provides equally can be distinguished
Going out is which light source there occurs shake, and can automatically control adjustable attenuator according in each light path by controller
The decay of the polarized light source in monitoring result real-time adjustment each bar light path, so that it meets the requirement of quantum key distribution, and then
The interruption of the quantum key distribution caused by light source shake on any road can be avoided, improve the efficiency of key distribution.
Fig. 4 is a kind of signal stream of the monitoring method of quantum key distribution light source supervising device provided in an embodiment of the present invention
Cheng Tu, the executive agent of the method is the supervising device that embodiment illustrated in fig. 2 provides.Shown in Figure 4, the present embodiment provides
A kind of monitoring method of quantum key distribution light source supervising device includes:
In s401, by the described beam splitter in each light path respectively by the light letter of polarized light source output described in each light path
Number separate a branch of, in order to enter line light source monitoring.
In s402, by the described power detection mouth in each light path respectively by the optical signal conversion of each polarized light source output
For analog electrical signal, and calculate the power of each analog electrical signal.
In s403, each partially according to the power adjustments of each analogue signal respectively by the described adjustable attenuator in each light path
The decay of the optical signal of 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 supervising device that the present embodiment provides is due in every road polarized light
All introduce a power detection mouth in the light path that source is located, therefore can respectively every road polarized light source be separately monitored,
Thus the light source which is distinguished there occurs is provided with one in shake, and the light path being located due to every road polarized light source
User therefore can be made to pass through adjustable attenuator according in each light path in order to adjust the adjustable attenuator of light source attenuation
The decay of the polarized light source in monitoring result real-time adjustment each bar light path, so that it meets the requirement of quantum key distribution, and then
The interruption of the quantum key distribution caused by light source shake on any road can be avoided, improve the efficiency of key distribution.
Fig. 5 is a kind of showing of the monitoring method of quantum key distribution light source supervising device that another embodiment of the present invention provides
Meaning flow chart, the executive agent of the method is the supervising device that embodiment illustrated in fig. 3 provides.Shown in Figure 5, the present embodiment carries
For a kind of monitoring method of quantum key distribution light source supervising device include:
In s501, by the described beam splitter in each light path respectively by the light letter of polarized light source output described in each light path
Number separate a branch of, in order to enter line light source monitoring.
In s502, by the described power detection mouth in each light path respectively by the optical signal conversion of each polarized light source output
For analog electrical signal, and calculate the power of each analog electrical signal.
In s503, whether preset requirement is met by the power that described controller judges described analogue signal, if not being inconsistent
Close preset requirement, then adjustable attenuator described in the Power Control according to described analogue signal adjusts the light of described polarized light source output
The decay of signal.
In the present embodiment, step s503 specifically includes:
Judge whether the power of described analogue signal is equal to predetermined power threshold value, if being not equal to predetermined power threshold value, root
Adjust the decay of the optical signal of described polarized light source output according to adjustable attenuator described in the Power Control of described analogue signal, make to decline
The power of the analog electrical signal corresponding to optical signal after subtracting is equal to described predetermined power threshold value.
Further, if described 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
State the fixing light decrement of the optical signal of polarized light source place light path, p is the average photon number of each light-pulse generator default.
Further, the span of the average photon number of described each light-pulse generator default is the positive number less than 1.Excellent
Choosing, in the present embodiment, the average photon number of described each light-pulse generator default is 0.1, so so that weak phase
Dry light source is closest to preferable single-photon source.
In the present embodiment, it is connected to power detection mouth due to being provided with one in the light path that each polarized light source is located
Controller and adjustable attenuator between, all can be realized according to power detection by described controller in therefore every light path
The Feedback of Power of mouth output controls described adjustable attenuator to adjust the attenuation of polarized light source, so that the polarized light in each bar light path
Source is satisfied by the purpose of the requirement of quantum key distribution, its without user's Non-follow control adjustable attenuator, accordingly, with respect to upper one
Embodiment, in hgher efficiency, 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 of the present embodiment offer is same
It is which light source there occurs shake that sample can be distinguished, and can by controller automatically control adjustable attenuator according to
The decay of the polarized light source in monitoring result real-time adjustment each bar light path in each light path, so that it meets quantum key distribution
Require, and then the interruption of the quantum key distribution caused by light source shake on any road can be avoided, improve key distribution
Efficiency.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all essences in the present invention
Any modification, equivalent and improvement made within god and principle etc., should be included within the scope of the present invention.
Claims (10)
1. a kind of quantum key distribution light source supervising device is it is characterised in that include respectively in the light path of each polarized light source
The beam splitter that is connected with described adjustable attenuator of the adjustable attenuator being connected with described polarized light source of setting and with described
The power detection mouth that beam splitter connects, wherein:
Described beam splitter, the optical signal for exporting described polarized light source separates a branch of, in order to enter line light source monitoring；
Described power detection mouth, for described optical signal is converted to analog electrical signal, and calculates described analog electrical signal
Power；
Described adjustable attenuator, for the light letter for user's polarized light source output according to the power adjustments of described analogue signal
Number decay, with polarized light source described in real-time control.
2. quantum key distribution light source supervising device as claimed in claim 1 is it is characterised in that the light path of each polarized light source
On be additionally provided with the controller being connected between described power detection mouth and described adjustable attenuator, wherein:
Described controller, whether the power for judging described analogue signal meets preset requirement, if not meeting preset requirement,
Adjustable attenuator described in Power Control according to described analogue signal adjusts the decay of the optical signal of described polarized light source output.
3. quantum key distribution light source supervising device as claimed in claim 2 is it is characterised in that described control implement body is used
In:
Judge whether the power of described analogue signal is equal to predetermined power threshold value, if being not equal to predetermined power threshold value, according to institute
State the decay that adjustable attenuator described in the Power Control of analogue signal adjusts the optical signal of described polarized light source output, after making decay
The analog electrical signal corresponding to optical signal power be equal to described predetermined power threshold value.
If 4. quantum key distribution light source supervising device as claimed in claim 3 is it is characterised in that described predetermined power threshold value
For pt, then 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 fixing light decrement of the optical signal of light source place light path of shaking, p is the average photon number of each light-pulse generator default.
5. quantum key distribution light source supervising device as claimed in claim 4 is it is characterised in that described each pulse default
The span of the average photon number of light source is the positive number less than 1.
6. a kind of monitoring method of quantum key distribution light source supervising device is it is characterised in that described quantum key distribution light source
Supervising device include respectively in the light path of each polarized light source setting the adjustable attenuator being connected with described polarized light source and
Beam splitter and the power detection mouth being connected with described beam splitter that described adjustable attenuator connects, wherein, described monitoring method
Including:
Respectively the optical signal of polarized light source output described in each light path is separated by the described beam splitter in each light path a branch of, use
To enter line light source monitoring；
The optical signal of each polarized light source output is converted to respectively by analog electrical signal by the described power detection mouth in each light path,
And calculate the power of each analog electrical signal；
Exported according to each polarized light source of power adjustments of each analogue signal respectively by the described adjustable attenuator in each light path
The decay of optical signal, with each polarized light source of real-time control.
7. monitoring method as claimed in claim 6 is connected to it is characterised in that being additionally provided with the light path of each polarized light source
Controller between described power detection mouth and described adjustable attenuator, wherein, described is declined by described adjustable in each light path
Subtract the decay of the optical signal of power adjustments each polarized light source output respectively according to each analogue signal for the device, each is inclined with real-time control
The light source that shakes specifically includes:
Whether preset requirement is met by the power that described controller judges described analogue signal, if not meeting preset requirement,
Adjustable attenuator described in Power Control according to described analogue signal adjusts the decay of the optical signal of described polarized light source output.
8. monitoring method as claimed in claim 7 is it is characterised in that described judge described analogue signal by described controller
Power whether meet preset requirement, if not meeting preset requirement, adjustable described in the Power Control according to described analogue signal
The decay that attenuator adjusts the optical signal of described polarized light source output specifically includes:
Judge whether the power of described analogue signal is equal to predetermined power threshold value, if being not equal to predetermined power threshold value, according to institute
State the decay that adjustable attenuator described in the Power Control of analogue signal adjusts the optical signal of described polarized light source output, after making decay
The analog electrical signal corresponding to optical signal power be equal to described predetermined power threshold value.
If 9. monitoring method as claimed in claim 8, it is characterised in that described predetermined power threshold value is pt, has 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 fixing light decrement of the optical signal of light source place light path of shaking, p is the average photon number of each light-pulse generator default.
10. monitoring method as claimed in claim 9 is it is characterised in that the average photon of described each light-pulse generator default
The span of number is the positive number less than 1.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610957366.7A CN106357399B (en) | 2016-10-26 | 2016-10-26 | A kind of quantum key distribution light source monitoring device and its monitoring method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106357399A true CN106357399A (en) | 2017-01-25 |
| CN106357399B CN106357399B (en) | 2019-09-24 |
Family
ID=57864339
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610957366.7A Active CN106357399B (en) | 2016-10-26 | 2016-10-26 | A kind of quantum key distribution light source monitoring device and its monitoring method |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN106357399B (en) |
| WO (1) | WO2018076936A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018076936A1 (en) * | 2016-10-26 | 2018-05-03 | 深圳市太赫兹科技创新研究院有限公司 | Device for monitoring quantum key distribution light source and monitoring method thereof |
| CN111307282A (en) * | 2020-02-24 | 2020-06-19 | 四川九洲电器集团有限责任公司 | Single photon source preparation system and method |
| CN111526004A (en) * | 2019-02-03 | 2020-08-11 | 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 |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN102820968A (en) * | 2012-07-10 | 2012-12-12 | 中国电力科学研究院 | One-time pad transmission system for measurement and control signals between transformer stations based on quantum key distribution |
| WO2013179094A1 (en) * | 2012-05-31 | 2013-12-05 | Nokia Corporation | Secured wireless communications |
| CN104506305A (en) * | 2014-12-08 | 2015-04-08 | 北京大学 | Signal source monitoring device and method in quantum key distribution system |
| CN104780039A (en) * | 2015-03-19 | 2015-07-15 | 宁波大学 | Polarization compensation implementation method for use in quantum key distribution |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| 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 |
| 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 |
-
2016
- 2016-10-26 CN CN201610957366.7A patent/CN106357399B/en active Active
-
2017
- 2017-09-07 WO PCT/CN2017/100908 patent/WO2018076936A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN102820968A (en) * | 2012-07-10 | 2012-12-12 | 中国电力科学研究院 | One-time pad transmission system for measurement and control signals between transformer stations based on quantum key distribution |
| CN104506305A (en) * | 2014-12-08 | 2015-04-08 | 北京大学 | Signal source monitoring device and method in quantum key distribution system |
| CN104780039A (en) * | 2015-03-19 | 2015-07-15 | 宁波大学 | Polarization compensation implementation method for use in quantum key distribution |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018076936A1 (en) * | 2016-10-26 | 2018-05-03 | 深圳市太赫兹科技创新研究院有限公司 | Device for monitoring quantum key distribution light source and monitoring method thereof |
| CN111526004A (en) * | 2019-02-03 | 2020-08-11 | 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 |
| 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 |
| CN111307282A (en) * | 2020-02-24 | 2020-06-19 | 四川九洲电器集团有限责任公司 | Single photon source preparation system and method |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2018076936A1 (en) | 2018-05-03 |
| CN106357399B (en) | 2019-09-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106357399A (en) | Quantum key distribution light source monitoring device and monitoring method thereof | |
| CN104641105B (en) | Method for controlling electric generator | |
| JP2017521033A5 (en) | ||
| CN102223181A (en) | Control method of electrical variable optical attenuator and optical attenuation system | |
| CN102545230A (en) | Voltage out-of-limit adjusting method | |
| CN106856429A (en) | A kind of quantum key dispatching system and method based on receiving terminal polarization beam splitting | |
| BR0316388A (en) | Channel merge for video on demand | |
| CN104173103A (en) | Coagulation Device Comprising an Energy Control | |
| CN107135071A (en) | One kind is based on time-multiplexed distribution of quantum key system and method | |
| CN105305959B (en) | A kind of photovoltaic performance intelligent checking system | |
| CN105226709B (en) | The choosing method of generator sequence is cut off in a kind of power grid high-frequency cutting machine allocation plan | |
| CN103730314A (en) | Gas ion source gas inlet real-time control system | |
| CN206878839U (en) | One kind is based on time-multiplexed distribution of quantum key system | |
| CN106647278B (en) | A kind of direct-current grid dcs | |
| CN109039592A (en) | Fast polarization feedback control method and device | |
| CN206602534U (en) | A kind of quantum key dispatching system based on continuous light copped wave | |
| CN106681147A (en) | Distributed control method of direct-current microgrid | |
| US20180159334A1 (en) | Method and system for load sharing among multiple dc generators | |
| CN110989334A8 (en) | Dynamic adjusting device for control parameters of laser cutting wafer | |
| CN105592379B (en) | A kind of control method, system and the mobile terminal of earphone power supply | |
| CN110351069A (en) | A kind of quantum key distribution system and method based on Y waveguide | |
| Xu et al. | Haptic data reduction for time-delayed teleoperation using the input-to-state stability approach | |
| EP2961048B1 (en) | Inverter control method, apparatus and system | |
| Kazuhiro et al. | PyHARK: A HARK-based python package for robot audition and computational auditory scene analysis | |
| CN106786480A (en) | A kind of direct-current grid stability determines method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |