CN206878839U - One kind is based on time-multiplexed distribution of quantum key system - Google Patents
One kind is based on time-multiplexed distribution of quantum key system Download PDFInfo
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- CN206878839U CN206878839U CN201720623929.9U CN201720623929U CN206878839U CN 206878839 U CN206878839 U CN 206878839U CN 201720623929 U CN201720623929 U CN 201720623929U CN 206878839 U CN206878839 U CN 206878839U
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Abstract
The utility model discloses one kind to be based on time-multiplexed distribution of quantum key system,System includes transmitting terminal and receiving terminal,Transmitting terminal is provided with the laser that can launch continuous light and single photon,And the laser transmission signal light and synchronizable optical by way of time-sharing multiplex,Other system in receiving terminal by increasing a polarization beam apparatus,Flashlight is decomposed into two vertical polarization states,The interference under respective polarization state is completed using polarization maintaining optical fibre interference ring,Obtain preferable result of interference,Avoiding birefringence effect in optical fiber transmitting procedure influences influence of the polarization state to result of interference,Deviation-rectifying system is abandoned simultaneously,Simplify the lengthy and jumbled degree of system,Also reduce production cost,Simultaneously,Single laser is driven to use time-multiplexed mode transmission signal light and synchronizable optical in systems,Reduce the numerous and diverse degree and production cost of system.
Description
Technical field
Optical transport safety communication technology field is the utility model is related to, it is more particularly to a kind of secret based on time-multiplexed quantum
Key dissemination system.
Background technology
With a wide range of popularization of internet, the information transmission between the mankind has reached unprecedented quantity and frequency,
On the internet, therefore, the mankind have also arrived unprecedented various privacy informations to the demand of secret communication for exposure more and more
Height.The cipher mode of present internet information safety is referred to as " public-key cryptography " cryptosystem, and its principle is to pass through encryption
Algorithm, the public-key cryptography propagated on network is generated, and stay in the private key of computer-internal, two keys must coordinate and make
With complete encryption and decryption processes could be realized.
The encryption standard that modern the Internet uses is the RSA Algorithm being born the 1970s, i.e., using matter several greatly because
Son, which decomposes, to be difficult to calculate to ensure the security of key.
Quantum-key distribution is that physicist Bennett in 1984 and cryptologist Brassard are proposed based on quantum force
The BB84 agreements of measuring principle are learned, quantum-key distribution can fundamentally ensure that the security of key.
Quantum key produces flashlight in transmitting terminal in the prior art, by traditional quantum channel transmitting procedure, by
It is more big changes in by the effect such as fiber channel birefringence, its polarization state, influences the interference effect in optical signal later stage, can make
The loss of integral key, at present, deviation-rectifying system can be increased in receiving terminal to solve the above problems, by deviation-rectifying system come also
The polarization state of former optical signal, but deviation-rectifying system needs complicated hardware and software section composition, to whole encryption key distribution system
System brings the complexity of total system and improves production cost；In addition, need to transmit in quantum key distribution system
Two ways of optical signals, it is synchronizable optical all the way, for producing synchronizing signal to receiving terminal and exporting gate-control signal to single-photon detector,
Another way is the flashlight for generating quantum key.Traditional method drives the laser of two wavelength to be respectively intended to produce together
Light and flashlight are walked, then transmit synchronizable optical and flashlight respectively by two optical fiber is answered to receiving terminal, or using wavelength-division
Mode is transmitted by same root optical fiber, refer to accompanying drawing 1, accompanying drawing 2, aforesaid way be required to use synchronous laser with
And signal laser, wavelength division multiplexer is needed to use using wave division multiplex mode, further increase system complexity and
Improve production cost.
Utility model content
The utility model purpose is that providing one kind is based on time-multiplexed distribution of quantum key system, to solve existing skill
The technical bug that quantum key distribution system structure is excessively numerous and diverse in art and production cost is too high.
What the technical solution of the utility model was realized in：
One kind is based on time-multiplexed distribution of quantum key system, including transmitting terminal and receiving terminal, and the transmitting terminal is with connecing
Receiving end is connected by quantum channel, the transmitting terminal include transmitting terminal driving plate, can launch continuous light and single photon laser,
Intensity modulator, interference unit, the first adjustable attenuator and the second adjustable attenuator, it is described to launch continuous light and single photon
Laser be sequentially connected intensity modulator, interference unit and the first adjustable attenuator all the way, another way connection second is adjustable
Attenuator, first adjustable attenuator are connected receiving terminal, transmitting terminal driving plate with the second adjustable attenuator by quantum channel
Connection can launch the laser of continuous light and single photon, intensity modulator, interference unit, the first adjustable attenuator and the respectively
Two adjustable attenuators；
The receiving terminal include receiving terminal driving plate, synchroprobe, polarization beam apparatus, two-way interference unit arranged side by side with
And two-way single-photon detector, the synchroprobe and polarization beam apparatus are adjustable by the corresponding connection second of quantum channel respectively
Attenuator and the first adjustable attenuator, the polarization beam apparatus connect two-way interference unit, the receiving terminal driving plate point respectively
Not Lian Jie synchroprobe, phase regulator and single-photon detector,
The interference unit includes front end polarization-maintaining beam splitter and rear end polarization-maintaining beam splitter, and front end polarization-maintaining beam splitter passes through respectively
Long-armed polarization maintaining optical fibre and galianconism polarization maintaining optical fibre is connected with rear end polarization-maintaining beam splitter, and phase is connected with the long-armed polarization maintaining optical fibre
Adjuster, the two-way interference unit of the receiving terminal part include two-way and exported respectively, and four tunnel output is two-by-two after cross-combining
Single-photon detector is connected respectively.
Preferably, the quantum channel is single-mode fiber.
Preferably, the two-way single-photon detector front end has been also respectively connected with polarization beam apparatus.
Preferably, the transmitting terminal also includes depolarizer, and the depolarizer is arranged on rear end polarization-maintaining beam splitter and
Between one adjustable attenuator.
The invention also discloses one kind to be based on time-multiplexed distribution of quantum key method, comprises the following steps：
1) laser timesharing triggers：Transmitting terminal can launch the laser of continuous light and single photon by the driving of transmitting terminal driving plate
Device produces flashlight and synchronizable optical using time-multiplexed mode, and the flashlight is as modulation light, the synchronizable optical conduct
Synchronous transmission of signal is to receiving terminal as used in synchroprobe response is receiving terminal；
2) state modulation is inveigled：Flashlight by intensity modulator carry out random strength modulation, turn into signal state, inveigle state or
Person's vacuum state；
3) transmitting terminal is interfered：Unequal arm MZ interference is made using interference unit, flashlight is divided into two by polarization-maintaining beam splitter
Individual pulse, wherein all the way by long-armed, it is long-armed in added with phase-modulator, random phase modulation is carried out to flashlight, galianconism is not
Do phase-modulation；
4) automatically controlled adjustable attenuator is decayed to flashlight：Flashlight decays light pulse by the first adjustable attenuator
To single photon magnitude, synchronizable optical adjusts synchronizable optical the strength range that can be responded to receiving terminal by the second adjustable attenuator；
5) flashlight and synchronizable optical throughput subchannel transmission：By flashlight and synchronizable optical by a quantum channel from hair
Penetrate end and transmit to receiving terminal, receiving terminal and be connected respectively by synchroprobe with polarization beam apparatus；
6) polarization beam apparatus beam splitting：The light of asynchronous polarization is decomposed into horizontal polarization direction by polarization beam apparatus and hung down
Straight polarization direction；
7) receiving terminal is interfered：The unequal arm MZ equal with transmitting terminal arm length difference is made using front end polarization-maintaining beam splitter to interfere
Ring, flashlight are divided into two pulses by front end polarization-maintaining beam splitter, wherein all the way by long-armed, it is long-armed in added with phase-modulation
Device, random phase modulation is carried out to flashlight, galianconism is not modulated；
8) single-photon detector detects：Two optical pulse signals after interference are merged into repetition rate by time division multiplexing
For original twice of light pulse signal, while the enabling frequency upgrading of single-photon detector is to original twice, obtained detection
As a result it is used for subsequent treatment and produces safe key.
Preferably, in the step 3), random 4 phase-modulation is carried out to flashlight, respectively 0, pi/2, π, 3 pi/2s；Step
7) random 2 phase-modulation is carried out in flashlight, respectively 0, pi/2.
Compared with prior art, the utility model has following beneficial effect：
It is of the present utility model to be based on time-multiplexed distribution of quantum key system and method, by increasing by one in receiving terminal
Polarization beam apparatus, flashlight is decomposed into two vertical polarization states, completed using polarization maintaining optical fibre interference ring under respective polarization state
Interference, obtain preferable result of interference, avoid in optical fiber transmitting procedure birefringence effect and influence polarization state and interference is tied
The influence of fruit, while deviation-rectifying system has been abandoned, the lengthy and jumbled degree of system is simplified, also reduces production cost, in addition, driving in systems
Move single laser and use time-multiplexed mode transmission signal light and synchronizable optical, reduce numerous and diverse degree and the production of system
Cost.
Brief description of the drawings
Fig. 1 produces schematic diagram for a kind of synchronizable optical in the prior art and flashlight；
Fig. 2 produces schematic diagram for another synchronizable optical in the prior art and flashlight；
Fig. 3 is theory diagram of the utility model based on time-multiplexed distribution of quantum key system；
Fig. 4 is flow chart of the utility model based on time-multiplexed distribution of quantum key method；
Fig. 5 is that synchronizable optical of the utility model based on time-multiplexed distribution of quantum key method produces principle with flashlight
Figure.
In figure：Transmitting terminal 100, transmitting terminal driving plate 101, the laser 102 that can launch continuous light and single photon, intensity are adjusted
Device 103 processed, the first adjustable attenuator 104, the second adjustable attenuator 105, receiving terminal 200, receiving terminal driving plate 201, synchronous spy
Survey device 202, polarization beam apparatus 203, single-photon detector 204, quantum channel 300, interference unit 400, depolarizer 500.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the utility model is clearly and completely described.
As shown in figure 3, a kind of be based on time-multiplexed distribution of quantum key system, including transmitting terminal 100 and receiving terminal
200, the transmitting terminal 100 is connected with receiving terminal 200 by quantum channel 300, and the quantum channel 300 is single-mode fiber, if
It is quantum channel 3 apart from need not be long, can also uses polarization maintaining optical fibre to transmit, to increase the stability of signal polarization state.Institute
State transmitting terminal 100 include transmitting terminal driving plate 101, the laser 102 that continuous light and single photon can be launched, intensity modulator 103,
Interference unit 400, the first adjustable attenuator 104 and the second adjustable attenuator 105, it is described to launch continuous light and single photon
The tunnel of laser 102 1 is sequentially connected intensity modulator 103, the adjustable attenuator 104 of interference unit 400 and first, and another way connects
The second adjustable attenuator 105 is connect, first adjustable attenuator 104 is connected with the second adjustable attenuator 105 by quantum channel 300
Receiving terminal 200 is connect, transmitting terminal driving plate 101 connects laser 102, the intensity modulator that can launch continuous light and single photon respectively
103rd, interference unit 400, the first adjustable attenuator 104 and the second adjustable attenuator 105；
It is arranged side by side that the receiving terminal 200 includes receiving terminal driving plate 201, synchroprobe 202, polarization beam apparatus 203, two-way
Interference unit 400 and two-way single-photon detector 204, the synchroprobe 202 pass through respectively with polarization beam apparatus 203
The second adjustable attenuator 105 of corresponding connection of quantum channel 300 and the first adjustable attenuator 104, the polarization beam apparatus 203 are distinguished
Two-way interference unit 400 is connected, the receiving terminal driving plate 201 connects synchroprobe 202, phase regulator and list respectively
Photon detector 204,
The interference unit 400 includes front end polarization-maintaining beam splitter and rear end polarization-maintaining beam splitter, front end polarization-maintaining beam splitter difference
It is connected with rear end polarization-maintaining beam splitter by long-armed polarization maintaining optical fibre and galianconism polarization maintaining optical fibre, is connected with the long-armed polarization maintaining optical fibre
Phase regulator, the two-way interference unit 400 of the receiving terminal part include two-way and exported respectively, and four tunnel output intersects two-by-two
Single-photon detector 204 is connected after merging respectively.The front end of two-way single-photon detector 204 has been also respectively connected with polarization beam splitting
Device 203.The transmitting terminal 100 also includes depolarizer 500, and the depolarizer 500 is arranged on rear end polarization-maintaining beam splitter and
Between one adjustable attenuator 104, the degree of polarization of flashlight can be reduced to 0 by the depolarizer 500 so that the polarization state of flashlight is
Natural light state, it is effectively guaranteed the security of system transmission key.
As shown in figure 4, the utility model, which additionally provides one kind, is based on time-multiplexed distribution of quantum key method, the distribution
Method can be realized based on above-mentioned quantum key dispatching system, comprise the following steps：
1) laser timesharing triggers：Transmitting terminal can launch the laser of continuous light and single photon by the driving of transmitting terminal driving plate
Device produces flashlight and synchronizable optical using time-multiplexed mode, and the flashlight is as modulation light, the synchronizable optical conduct
Synchronous transmission of signal is to receiving terminal as used in synchroprobe response is receiving terminal；
2) state modulation is inveigled：Flashlight by intensity modulator carry out random strength modulation, turn into signal state, inveigle state or
Person's vacuum state；
3) transmitting terminal is interfered：Unequal arm MZ interference is made using interference unit, flashlight is divided into two by polarization-maintaining beam splitter
Individual pulse, wherein all the way by long-armed, it is long-armed in added with phase-modulator, random phase modulation is carried out to flashlight, galianconism is not
Do phase-modulation；
4) automatically controlled adjustable attenuator is decayed to flashlight：Flashlight decays light pulse by the first adjustable attenuator
To single photon magnitude, synchronizable optical adjusts synchronizable optical the strength range that can be responded to receiving terminal by the second adjustable attenuator；
5) flashlight and synchronizable optical throughput subchannel transmission：By flashlight and synchronizable optical by a quantum channel from hair
Penetrate end and transmit to receiving terminal, receiving terminal and be connected respectively by synchroprobe with polarization beam apparatus；
6) polarization beam apparatus beam splitting：The light of asynchronous polarization is decomposed into horizontal polarization direction by polarization beam apparatus and hung down
Straight polarization direction；
7) receiving terminal is interfered：The unequal arm MZ equal with transmitting terminal arm length difference is made using front end polarization-maintaining beam splitter to interfere
Ring, flashlight are divided into two pulses by front end polarization-maintaining beam splitter, wherein all the way by long-armed, it is long-armed in added with phase-modulation
Device, random phase modulation is carried out to flashlight, galianconism is not modulated；
8) single-photon detector detects：Two optical pulse signals after interference are merged into repetition rate by time division multiplexing
For original twice of light pulse signal, while the enabling frequency upgrading of single-photon detector is to original twice, obtained detection
As a result it is used for subsequent treatment and produces safe key.
Preferably, in the step 3), random 4 phase-modulation is carried out to flashlight, respectively 0, pi/2, π, 3 pi/2s；Step
7) random 2 phase-modulation is carried out in flashlight, respectively 0, pi/2.
As shown in figure 5, in step 1), the transmitting that can launch the timesharing according to demand of the laser of continuous light and single photon is synchronous
Light and flashlight.
Comprehensive structure of the present utility model is understood with principle, of the present utility model to be based on time-multiplexed distribution of quantum key
System, by increasing a polarization beam apparatus in receiving terminal, flashlight is decomposed into two vertical polarization states, utilizes polarization-maintaining light
Fine interference ring completes the interference under respective polarization state, obtains preferable result of interference, avoids birefringence in optical fiber transmitting procedure
Influence of the effects polarization state to result of interference, while deviation-rectifying system has been abandoned, the lengthy and jumbled degree of system is simplified, is also reduced
Production cost, in addition, driving single laser to use time-multiplexed mode transmission signal light and synchronizable optical in systems, drop
The low numerous and diverse degree and production cost of system.
Claims (4)
1. one kind is based on time-multiplexed distribution of quantum key system, it is characterised in that：Including transmitting terminal and receiving terminal, the hair
Penetrate end to be connected by quantum channel with receiving terminal, the transmitting terminal includes transmitting terminal driving plate, can launch continuous light and single photon
Laser, intensity modulator, interference unit, the first adjustable attenuator and the second adjustable attenuator, it is described launch it is continuous
The laser of light and single photon is sequentially connected intensity modulator, interference unit and the first adjustable attenuator all the way, and another way connects
The second adjustable attenuator is connect, first adjustable attenuator is connected receiving terminal with the second adjustable attenuator by quantum channel, hair
End driving plate is penetrated to connect the laser that can launch continuous light and single photon, intensity modulator respectively, interference unit, first adjustable decline
Subtract device and the second adjustable attenuator；
The receiving terminal includes receiving terminal driving plate, synchroprobe, polarization beam apparatus, two-way interference unit and two arranged side by side
Road single-photon detector, the synchroprobe pass through quantum channel the second adjustable damping of corresponding connection respectively with polarization beam apparatus
Device and the first adjustable attenuator, the polarization beam apparatus connect two-way interference unit respectively, and the receiving terminal driving plate connects respectively
Synchroprobe, phase regulator and single-photon detector are connect,
The interference unit includes front end polarization-maintaining beam splitter and rear end polarization-maintaining beam splitter, and front end polarization-maintaining beam splitter is respectively by long-armed
Polarization maintaining optical fibre and galianconism polarization maintaining optical fibre are connected with rear end polarization-maintaining beam splitter, and phase adjusted is connected with the long-armed polarization maintaining optical fibre
Device, the two-way interference unit of the receiving terminal part include two-way and exported respectively, and four tunnel is distinguished after exporting cross-combining two-by-two
Connect single-photon detector.
2. time-multiplexed distribution of quantum key system is based on as claimed in claim 1, it is characterised in that the quantum channel
For single-mode fiber.
3. time-multiplexed distribution of quantum key system is based on as claimed in claim 2, it is characterised in that the two-way monochromatic light
Sub- detector front end has been also respectively connected with polarization beam apparatus.
4. time-multiplexed distribution of quantum key system is based on as claimed in claim 1, it is characterised in that the transmitting terminal is also
Include depolarizer, the depolarizer is arranged between rear end polarization-maintaining beam splitter and the first adjustable attenuator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720623929.9U CN206878839U (en) | 2017-06-01 | 2017-06-01 | One kind is based on time-multiplexed distribution of quantum key system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720623929.9U CN206878839U (en) | 2017-06-01 | 2017-06-01 | One kind is based on time-multiplexed distribution of quantum key system |
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| CN206878839U true CN206878839U (en) | 2018-01-12 |
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| CN201720623929.9U Withdrawn - After Issue CN206878839U (en) | 2017-06-01 | 2017-06-01 | One kind is based on time-multiplexed distribution of quantum key system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107135071A (en) * | 2017-06-01 | 2017-09-05 | 浙江九州量子信息技术股份有限公司 | One kind is based on time-multiplexed distribution of quantum key system and method |
-
2017
- 2017-06-01 CN CN201720623929.9U patent/CN206878839U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107135071A (en) * | 2017-06-01 | 2017-09-05 | 浙江九州量子信息技术股份有限公司 | One kind is based on time-multiplexed distribution of quantum key system and method |
| CN107135071B (en) * | 2017-06-01 | 2023-08-18 | 浙江九州量子信息技术股份有限公司 | Quantum key distribution system and method based on time division multiplexing |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20180112 Effective date of abandoning: 20230818 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20180112 Effective date of abandoning: 20230818 |