CN206743264U - A kind of quantum key dispatching system based on two-way single photon detection - Google Patents
A kind of quantum key dispatching system based on two-way single photon detection Download PDFInfo
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- CN206743264U CN206743264U CN201720221795.8U CN201720221795U CN206743264U CN 206743264 U CN206743264 U CN 206743264U CN 201720221795 U CN201720221795 U CN 201720221795U CN 206743264 U CN206743264 U CN 206743264U
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- division multiplexer
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Abstract
A kind of quantum key dispatching system based on two-way single photon detection, including transmitting terminal and receiving terminal, the transmitting terminal includes transmitting terminal driving plate, signal laser, synchronous laser, intensity modulator, polarization-maintaining beam splitter, the first adjustable attenuator, the second adjustable attenuator and transmitting terminal wavelength division multiplexer, the receiving terminal includes receiving terminal driving plate, receiving terminal wavelength division multiplexer, synchroprobe, polarization beam apparatus, polarization-maintaining beam splitter and single-photon detector, and the receiving terminal wavelength division multiplexer connects transmitting terminal wavelength division multiplexer by quantum channel.Compared with prior art, the utility model 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, deviation-rectifying system has been abandoned simultaneously, the lengthy and jumbled degree of system has been simplified, also reduces production cost.
Description
Technical field
It the utility model is related to optical transport safety communication technology field, it is more particularly to a kind of based on two-way single photon detection
Quantum key dispatching 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, existing key dispatching system at least needs four tunnels
Single-photon detector carries out detection processing, further adds the complexity and production cost of system.
Utility model content
The utility model purpose is to provide a kind of quantum key dispatching system, to solve in the prior art to solve to believe
Number light transmits the problem of polarization state change in quantum channel to increase deviation-rectifying system in receiving terminal, reduced by deviation-rectifying system
The polarization state of optical signal, but deviation-rectifying system needs complicated hardware and software section composition, to whole key dispatching system
Bring the complexity of total system and improve the technical bug of production cost.
What the technical solution of the utility model was realized in：
A kind of quantum key dispatching system based on two-way single photon detection, including transmitting terminal and receiving terminal, the transmitting
End be connected with receiving terminal by quantum channel, the transmitting terminal including transmitting terminal driving plate, signal laser, synchronous laser,
Intensity modulator, interference unit, the first adjustable attenuator, the second adjustable attenuator and transmitting terminal wavelength division multiplexer, the letter
Number laser is sequentially connected intensity modulator, interference unit, the first adjustable attenuator and transmitting terminal wavelength division multiplexer, described same
Step laser is sequentially connected the second adjustable attenuator and transmitting terminal wavelength division multiplexer, and first adjustable attenuator and second can
Controlled attenuator connects same one end of transmitting terminal wavelength division multiplexer, and transmitting terminal driving plate connects signal laser, intensity modulated respectively
Device, phase regulator, synchronous laser, the first adjustable attenuator and the second adjustable attenuator；
The receiving terminal includes receiving terminal driving plate, receiving terminal wavelength division multiplexer, synchroprobe, polarization beam apparatus, two
Road interference unit arranged side by side and two-way single-photon detector, the receiving terminal wavelength division multiplexer is connected by quantum channel to be launched
Wavelength division multiplexer is held, the other end of the receiving terminal wavelength division multiplexer connects synchroprobe and polarization beam apparatus respectively, described
Polarization beam apparatus connects two-way interference unit respectively, and the receiving terminal driving plate connects synchroprobe, phase regulator respectively
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 leads to respectively
Cross long-armed polarization maintaining optical fibre and galianconism polarization maintaining optical fibre to be connected with rear end polarization-maintaining beam splitter, phase is connected with the long-armed polarization maintaining optical fibre
Position adjuster, the two-way interference unit of the receiving terminal part include two-way and exported respectively, and four tunnel exports cross-combining two-by-two
Connect single-photon detector respectively afterwards.
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 utility model additionally provides a kind of quantum key distribution method based on two-way single photon detection, including following step
Suddenly：
1) laser triggers：Transmitting terminal utilizes same clock signal difference trigger signal laser and synchronous laser hair
Project flashlight and synchronizable optical, the flashlight as modulation light, the synchronizable optical as synchronous transmission of signal to receiving terminal by
Synchroprobe response is used in receiving terminal；
2) state modulation is inveigled：The flashlight of signal laser transmitting carries out random strength modulation by intensity modulator, into
For signal state, inveigle state or 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：The different flashlight of wavelength and synchronizable optical are passed through in transmitting terminal
Cross transmitting terminal wavelength division multiplexer and be incorporated into a transmission, and decomposed again by receiving terminal wavelength division multiplexer in receiving terminal；
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
Enabling frequency for original twice of light pulse signal, while single-photon detector is also promoted to original twice, obtained spy
Survey result and be used for subsequent treatment generation 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：
Quantum key dispatching system of the present utility model based on two-way single photon detection, 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, the system only needs
Detection processing is carried out using two-way single-photon detector, reduce further the lengthy and jumbled degree of system, reduce production cost.
Brief description of the drawings
Fig. 1 is the theory diagram of quantum key dispatching system of the utility model based on two-way single photon detection；
Fig. 2 is the flow chart of quantum key distribution method of the utility model based on two-way single photon detection.
In figure：Transmitting terminal 1, transmitting terminal driving plate 101, signal laser 102, synchronous laser 103, intensity modulator
104, the first adjustable attenuator 105, the second adjustable attenuator 106, transmitting terminal wavelength division multiplexer 107, depolarizer 108, receiving terminal
2, receiving terminal driving plate 201, receiving terminal wavelength division multiplexer 202, synchroprobe 203, polarization beam apparatus 204, single photon detection
Device 205, quantum channel 3, interference unit 4, phase regulator 401, front end polarization-maintaining beam splitter 402, rear end polarization-maintaining beam splitter 403.
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 1, a kind of quantum key dispatching system based on two-way single photon detection, including transmitting terminal 1 is with receiving
End 2, the transmitting terminal 1 is connected with receiving terminal 2 by quantum channel 3, and the transmitting terminal 1 includes transmitting terminal driving plate 101, signal
Laser 102, synchronous laser 103, intensity modulator 104, interference unit 4, the first adjustable attenuator 105, second is adjustable declines
Subtract device 106 and transmitting terminal wavelength division multiplexer 107, the signal laser 102 is sequentially connected intensity modulator 104, interference list
First 4, first adjustable attenuator 105 and transmitting terminal wavelength division multiplexer 107, the synchronous laser 103 is sequentially connected second can
Controlled attenuator 106 and transmitting terminal wavelength division multiplexer 107, first adjustable attenuator 105 connect with the second adjustable attenuator 106
Same one end of transmitting terminal wavelength division multiplexer 107 is connect, transmitting terminal driving plate 101 connects signal laser 102, intensity modulator respectively
104th, phase regulator 401, synchronous laser 103, the first adjustable attenuator 105 and the second adjustable attenuator 106, the hair
Penetrate the phase regulator 401 and intensity modulator 104, the first adjustable attenuator 105, the second adjustable attenuator 106 of 1 part of end
Transmitting terminal driving plate 101 is connected by analog control signal line respectively, the signal laser 102, synchronous laser 103 are distinguished
Transmitting terminal driving plate 101 is connected by digital controlled signal line；The receiving terminal 2 includes receiving terminal driving plate 201, receiving terminal ripple
Division multiplexer 202, synchroprobe 203, polarization beam apparatus 204, two-way interference unit 4 arranged side by side and two-way single photon detection
Device 205, the receiving terminal wavelength division multiplexer 202 connect transmitting terminal wavelength division multiplexer 107, the receiving terminal by quantum channel 3
The other end of wavelength division multiplexer 202 connects synchroprobe 203 and polarization beam apparatus 204 respectively, and the polarization beam apparatus 204 divides
Not Lian Jie two-way interference unit 4, the receiving terminal driving plate 201 connect respectively synchroprobe 203, phase regulator 401 with
And single-photon detector 205, the phase regulator 401 of the part of receiving terminal 2 connect receiving terminal by analog control signal line
Driving plate 201.The interference unit 4 includes front end polarization-maintaining beam splitter 402 and rear end polarization-maintaining beam splitter 403, front end polarization-maintaining beam splitting
Device 402 is connected by long-armed polarization maintaining optical fibre and galianconism polarization maintaining optical fibre with rear end polarization-maintaining beam splitter 403 respectively, the long-armed polarization-maintaining
Phase regulator 401 is connected with optical fiber, the two-way interference unit 4 of the part of receiving terminal 2 includes two-way and exported respectively, and this four
Road connects single-photon detector 205 respectively after exporting cross-combining two-by-two.In the present embodiment, the quantum channel 3 is single-mode optics
Fibre, if quantum channel 3 apart from need not be long, can also use polarization maintaining optical fibre to transmit, to increase the stabilization of signal polarization state
Property.The front end of two-way single-photon detector 205 has been also respectively connected with polarization beam apparatus 204.The transmitting terminal 1, which also includes, to disappear
Inclined device 108, the depolarizer 108 is arranged between the adjustable attenuator 104 of rear end polarization-maintaining beam splitter 403 and first, described to disappear
The degree of polarization of flashlight can be reduced to 0 by inclined device 108 so that the polarization state of flashlight is nature light state, is effectively guaranteed and is
The security of system transmission key.
As shown in Fig. 2 the utility model additionally provides a kind of quantum key distribution method based on two-way single photon detection,
The distribution method can be realized based on above-mentioned quantum key dispatching system, comprise the following steps：
1) laser triggers：Transmitting terminal utilizes same clock signal difference trigger signal laser and synchronous laser hair
Project flashlight and synchronizable optical, the flashlight as modulation light, the synchronizable optical as synchronous transmission of signal to receiving terminal by
Synchroprobe response is used in receiving terminal；
2) state modulation is inveigled：The flashlight of signal laser transmitting carries out random strength modulation by intensity modulator, into
For signal state, inveigle state or 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：The different flashlight of wavelength and synchronizable optical are passed through in transmitting terminal
Cross transmitting terminal wavelength division multiplexer and be incorporated into a transmission, and decomposed again by receiving terminal wavelength division multiplexer in receiving terminal；
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
Enabling frequency for original twice of light pulse signal, while single-photon detector is also promoted to original twice, obtained spy
Survey result and be used for subsequent treatment generation safe key.In the step 3), random 4 phase-modulation is carried out to flashlight, is respectively
0, pi/2, π, 3 pi/2s；Carry out random 2 phase-modulation in step 7) to flashlight, respectively 0, pi/2.
Comprehensive structure of the present utility model understands that the quantum of the present utility model based on two-way single photon detection is close with principle
Key distribution system and method, by increasing a polarization beam apparatus in receiving terminal, flashlight is decomposed into two vertical polarizations
State, the interference under respective polarization state is completed using polarization maintaining optical fibre interference ring, obtains preferable result of interference, avoid optical fiber transmission
During birefringence effect influence influence of the polarization state to result of interference, while abandoned deviation-rectifying system, it is superfluous to simplify system
Miscellaneous degree, also reduces production cost, in addition, the system only needs to carry out detection processing using two-way single-photon detector, enters one
Step reduces the lengthy and jumbled degree of system, reduces production cost.
Claims (4)
- A kind of 1. quantum key dispatching system based on two-way single photon detection, it is characterised in that：Including transmitting terminal and receiving terminal, The transmitting terminal is connected with receiving terminal by quantum channel, and the transmitting terminal includes transmitting terminal driving plate, signal laser, synchronization Laser, intensity modulator, interference unit, the first adjustable attenuator, the second adjustable attenuator and transmitting terminal wavelength division multiplexer, The signal laser is sequentially connected intensity modulator, interference unit, the first adjustable attenuator and transmitting terminal wavelength division multiplexer, The synchronous laser is sequentially connected the second adjustable attenuator and transmitting terminal wavelength division multiplexer, first adjustable attenuator with Second adjustable attenuator connects same one end of transmitting terminal wavelength division multiplexer, and transmitting terminal driving plate connects signal laser, strong respectively Spend modulator, phase regulator, synchronous laser, the first adjustable attenuator and the second adjustable attenuator；The receiving terminal includes receiving terminal driving plate, receiving terminal wavelength division multiplexer, synchroprobe, polarization beam apparatus, two-way simultaneously The interference unit and two-way single-photon detector of row, the receiving terminal wavelength division multiplexer connect transmitting terminal ripple by quantum channel Division multiplexer, the other end of the receiving terminal wavelength division multiplexer connect synchroprobe and polarization beam apparatus, the polarization respectively Beam splitter connects two-way interference unit respectively, the receiving terminal driving plate connect respectively 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 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. the quantum key dispatching system as claimed in claim 1 based on two-way single photon detection, it is characterised in that the amount Subchannel is single-mode fiber.
- 3. the quantum key dispatching system as claimed in claim 2 based on two-way single photon detection, it is characterised in that described two Road single-photon detector front end has been also respectively connected with polarization beam apparatus.
- 4. the quantum key dispatching system as claimed in claim 1 based on two-way single photon detection, it is characterised in that the hair Penetrate end and also include depolarizer, the depolarizer is arranged between rear end polarization-maintaining beam splitter and the first adjustable attenuator.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720221795.8U CN206743264U (en) | 2017-03-08 | 2017-03-08 | A kind of quantum key dispatching system based on two-way single photon detection |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106789048A (en) * | 2017-03-08 | 2017-05-31 | 浙江九州量子信息技术股份有限公司 | A kind of quantum key dispatching system and method based on two-way single photon detection |
| CN107947929A (en) * | 2017-12-28 | 2018-04-20 | 中南大学 | Continuous variable quantum key distribution system and implementation method based on k neighbours processing |
| CN110830121A (en) * | 2019-11-01 | 2020-02-21 | 国开启科量子技术(北京)有限公司 | Classical channel and quantum channel wavelength division multiplexing system and method |
| CN115801254A (en) * | 2023-02-07 | 2023-03-14 | 合肥硅臻芯片技术有限公司 | Quantum key distribution method, transmitting terminal and quantum key distribution system |
-
2017
- 2017-03-08 CN CN201720221795.8U patent/CN206743264U/en not_active Withdrawn - After Issue
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106789048A (en) * | 2017-03-08 | 2017-05-31 | 浙江九州量子信息技术股份有限公司 | A kind of quantum key dispatching system and method based on two-way single photon detection |
| CN106789048B (en) * | 2017-03-08 | 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 two-way single photon detection |
| CN107947929A (en) * | 2017-12-28 | 2018-04-20 | 中南大学 | Continuous variable quantum key distribution system and implementation method based on k neighbours processing |
| CN107947929B (en) * | 2017-12-28 | 2021-04-23 | 中南大学 | Continuous variable quantum key distribution system based on k-nearest neighbor processing and implementation method |
| CN110830121A (en) * | 2019-11-01 | 2020-02-21 | 国开启科量子技术(北京)有限公司 | Classical channel and quantum channel wavelength division multiplexing system and method |
| CN115801254A (en) * | 2023-02-07 | 2023-03-14 | 合肥硅臻芯片技术有限公司 | Quantum key distribution method, transmitting terminal and quantum key distribution system |
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