CN207968509U - A kind of quantum key dispatching system based on two-way polarization compensation - Google Patents
A kind of quantum key dispatching system based on two-way polarization compensation Download PDFInfo
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Abstract
A kind of quantum key dispatching system based on two-way polarization compensation, common end includes the identical synchronizing signal light emitting unit of two-way and signal light emitting unit transmitting terminal includes transmitting terminal wavelength division multiplexer and transmitting terminal faraday mirror connected to it, transmitting terminal phase compensation ring, receiving terminal include receiving terminal wavelength division multiplexer and difference receiving terminal faraday mirror connected to it, receiving terminal phase compensation ring respectively.Compared with prior art, the utility model in the phase modulation process of optical signal by being arranged two-way phase compensation ring, the single photon after phase modulation receiving terminal is sent to by phase compensation ring internal interference to detect for single-photon detector, avoiding birefringence effect in optical fiber transmission process 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, this system only needs to carry out detection processing using two-way single-photon detector, the lengthy and jumbled degree that further reduced system, reduces production cost.
Description
Technical field
The utility model is related to optical transport safety communication technology field, more particularly to a kind of amount based on two-way polarization compensation
Sub-key distribution system.
Background technology
A wide range of with internet is popularized, and the information transmission between the mankind has reached unprecedented quantity and frequency,
On the internet, therefore, demand of the mankind to secret communication has also arrived unprecedented various privacy informations for exposure more and more
Height.The cipher mode of present internet information safety is known as " public-key cryptography " cryptosystem, and principle is to pass through encryption
Algorithm generates the public-key cryptography propagated on network, and stays in the private key of computer-internal, and two keys must coordinate and make
With could realize complete encryption and decryption processes.
The encryption standard that modern the Internet uses is the RSA Algorithm being born the 1970s, i.e., using matter several greatly because
Son decomposes and is difficult to calculate to ensure the safety 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 safety of key.
Quantum key generates signal light in transmitting terminal in the prior art, by traditional quantum channel transmission process, by
In by fiber channel birefringence the effects that, polarization state is more big changes, and influences the interference effect in optical signal later stage, can be made
The loss of integral key, currently, deviation-rectifying system can be increased in receiving terminal, by deviation-rectifying system come also to solve the above-mentioned problems
The polarization state of former optical signal, but deviation-rectifying system needs complicated hardware and software section composition, gives entire encryption key distribution system
System brings the complexity of total system and improves production cost.
Utility model content
The utility model aim is to provide a kind of quantum key dispatching system based on two-way polarization compensation, existing to solve
Have and transmit polarization state variation to solve the problems, such as signal light in quantum channel in technology and can increase deviation-rectifying system in receiving terminal,
The polarization state of optical signal is restored by deviation-rectifying system, but deviation-rectifying system needs complicated hardware and software section composition,
The complexity of total system is brought to entire key dispatching system and improves 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 polarization compensation, including common end, transmitting terminal and receiving terminal, it is described
Common end includes the identical synchronizing signal light emitting unit of two-way and signal light emitting unit, the synchronizing signal light emitting list
Member includes synchronous laser, circulator and common end wavelength division multiplexer, and the synchronous laser front end is all connected with synchronization letter
The output end of number driver, synchronous laser connects circulator first port, and the second port of circulator connects common end wavelength-division
The third port of multiplexer inputs, circulator connects the first polarization-maintaining beam splitter；The signal light emitting unit includes that signal swashs
Light device, AMZ interference rings, the first polarization beam apparatus, the second polarization beam apparatus, the second polarization-maintaining beam splitter, the first single-photon detector
And second single-photon detector, the first polarization-maintaining beam splitter output end connection signal laser, the signal laser are defeated
Outlet connects AMZ interference rings, and the output end of the AMZ interference rings is separately connected the first polarization beam apparatus and the second polarization beam splitting
Device, first polarization beam apparatus connect two-way single-photon detector with the second polarization beam apparatus by the second polarization-maintaining beam splitter,
The output end of two-way common end wavelength division multiplexer is separately connected transmitting terminal and receiving terminal, and the transmitting terminal includes that transmitting terminal wavelength-division is multiple
With device and difference transmitting terminal faraday mirror connected to it, transmitting terminal phase compensation ring, the receiving terminal includes receiving terminal wave
Division multiplexer and respectively receiving terminal faraday mirror connected to it, receiving terminal phase compensation ring.
Preferably, the transmitting terminal phase compensation ring is consistent with receiving terminal phase compensation ring structure, the two-way interference ring point
It Bao Kuo not third polarization beam apparatus, the first intensity modulator, first phase modulator, the second intensity modulator, second phase tune
Device processed, third polarization beam apparatus front end connect transmitting terminal wavelength division multiplexer or receiving terminal wavelength division multiplexer by attenuator,
The vertical component end of the third polarization beam apparatus is sequentially connected the first intensity modulated, second phase modulator, and the third is inclined
The shake horizontal component end of beam splitter connects first phase modulator, the second intensity modulator successively, the second phase modulator with
Second intensity modulator connects.
Preferably, the first intensity modulator and the second intensity modulator include the 4th polarization beam apparatus, third phase modulation
Device and modulator faraday mirror, the 4th polarization beam apparatus connect by long-armed connection modulator faraday mirror, by galianconism
Third phase modulator is connect, and modulator faraday mirror connect cyclization with third phase modulator.
Compared with prior art, the utility model has following advantageous effect：
The quantum key dispatching system based on two-way polarization compensation of the utility model, passes through the phase-modulation in optical signal
Two-way phase compensation ring is set in the process, the single photon after phase modulation is sent to for list by receiving terminal by phase compensation ring internal interference
Photon detector detects, and using by phase compensation, obtains preferable result of interference, avoids birefringence in optical fiber transmission process
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 further reduced system in addition, this system only needs to carry out detection processing using two-way single-photon detector
Lengthy and jumbled degree, reduces production cost.
Description of the drawings
Fig. 1 is the functional block diagram of quantum key dispatching system of the utility model based on two-way polarization compensation：
Fig. 2 is the functional block diagram of the utility model intensity modulator.
In figure：Common end 100, synchronous laser 101, circulator 102, common end wavelength division multiplexer 103, synchronizing signal are driven
Dynamic device 104, the first polarization-maintaining beam splitter 105, signal laser 106, AMZ interference rings 107, the first polarization beam apparatus 108, second partially
Shake beam splitter 109, the second polarization-maintaining beam splitter 110, the first single-photon detector 111, the second single-photon detector 112, transmitting terminal
200, transmitting terminal wavelength division multiplexer 201, transmitting terminal faraday mirror 202, transmitting terminal phase compensation ring 203, receiving terminal 300, reception
End wavelength division multiplexer 301, receiving terminal faraday mirror 302, receiving terminal phase compensation ring 303, third polarization beam apparatus 400, first
Intensity modulator 500, first phase modulator 600, the second intensity modulator 700, second phase modulator 800, the 4th polarization
Beam splitter 701, third phase modulator 702, modulator faraday mirror 703.
Specific implementation mode
The following will be combined with the drawings in the embodiments of the present invention, is clearly and completely described the utility model.
As shown in Figure 1 and Figure 2, a kind of quantum key dispatching system based on two-way polarization compensation, including common end 100
(Charlie), transmitting terminal 200 (Alice) and receiving terminal 300 (Bob), the common end 100 include the identical synchronous letter of two-way
Number light emitting unit and signal light emitting unit, the synchronizing signal light emitting unit includes synchronous laser 101, circulator
102 and common end wavelength division multiplexer 103,101 front end of the synchronous laser be all connected with a synchronization signal driver 104, together
Step signal driver 104 is for driving the synchronous optical signal of the transmitting of synchronous laser 101, the output end connection of synchronous laser 101
The second port of 102 first port of circulator, circulator 102 connects common end wavelength division multiplexer input terminal 103, circulator 102
Third port connect the first polarization-maintaining beam splitter 105；The signal light emitting unit includes signal laser 106, AMZ interference rings
107 (unequal arm Mach-Zehnder interference rings), the first polarization beam apparatus 108, the second polarization beam apparatus 109, the second polarization-maintaining beam splitter
110, the first single-photon detector 111 and the second single-photon detector 112,105 output end of the first polarization-maintaining beam splitter connect
Connect signal laser 106,106 output end of the signal laser connects AMZ interference rings 107, the AMZ interference rings 107 it is defeated
Outlet is separately connected the first polarization beam apparatus 108 and the second polarization beam apparatus 109, first polarization beam apparatus 108 and second
Polarization beam apparatus 109 connects two-way single-photon detector, two-way common end wavelength division multiplexer by the second polarization-maintaining beam splitter 110
103 output end is separately connected transmitting terminal 200 and receiving terminal 300, and the transmitting terminal 200 includes transmitting terminal wavelength division multiplexer 201
And transmitting terminal faraday mirror 202 connected to it, transmitting terminal phase compensation ring 203, the receiving terminal 300 include receiving respectively
Hold wavelength division multiplexer 301 and respectively receiving terminal faraday mirror 302 connected to it, receiving terminal phase compensation ring 303；The hair
It is consistent with 303 ring structure of receiving terminal phase compensation to penetrate end phase compensation ring 203, which respectively includes third polarization point
Beam device 400, the first intensity modulator 500, first phase modulator 600, the second intensity modulator 700, second phase modulator
800,400 front end of third polarization beam apparatus connects transmitting terminal wavelength division multiplexer 201 or receiving terminal wavelength-division by attenuator 900
The vertical component end of multiplexer 301, the third polarization beam apparatus 400 is sequentially connected the first intensity modulated 500, second phase tune
The horizontal component end of device 800 processed, the third polarization beam apparatus 400 connects first phase modulator 600, the second intensity modulated successively
Device 700, the second phase modulator 800 are connect with the second intensity modulator 700.First intensity modulator 500 and the last the second
It spends modulator 700 and includes the 4th polarization beam apparatus 701, third phase modulator 702 and modulator faraday mirror 703, it is described
4th polarization beam apparatus 701 connects third phase modulator 702 by long-armed connection modulator faraday mirror 703, by galianconism,
And modulator faraday mirror 703 connect cyclization with third phase modulator 702.
Operation principle：The two-way synchronous laser 101 of common end 100 is launched by the driving of synchronizing signal driver 104
Synchronizable optical, synchronizable optical enters common end wavelength division multiplexer 103 by circulator, and by transmitting terminal wavelength division multiplexer 201 or connects
Receiving end wavelength division multiplexer 301 enters transmitting terminal 200 (Alice) or receiving terminal 300 (Bob), is used to swash with signal phototiming, signal
Light device 106 launches signal light, and signal light interferes by AMZ interference rings 107, two arteries and veins light are divided into after interference and respectively enter first
Polarization beam apparatus 108 and the second polarization beam apparatus 109, then respectively enter transmitting terminal 200 by common end wavelength division multiplexer 103
(Alice) phase compensation is carried out with receiving terminal 300 (Bob), wherein synchronizable optical by transmitting terminal faraday mirror 202 or receives hold-carrying
Common end 100 is returned to when drawing mirror 302, signal light is carried out by transmitting terminal phase compensation ring 203 or receiving terminal phase compensation 303
Common end 100 is returned to after phase compensation, and light extraction is detected by the first single-photon detector 111 or the second single-photon detector 112
Pulse generates security key for subsequent processing.In the process, system does not need deviation-rectifying system to the light arteries and veins after polarization compensation
Capable correction is rushed in, while it is depolarized to light pulse progress also not need depolarizer.
The structure of comprehensive the utility model is with principle it is found that the quantum key based on two-way polarization compensation of the utility model
Distribution system passes through phase compensation ring internal interference by the way that two-way phase compensation ring is arranged in the phase modulation process of optical signal
Single photon after phase modulation is sent to receiving terminal to detect for single-photon detector, using by phase compensation, is preferably done
It relates to as a result, avoiding birefringence effect in optical fiber transmission process influences influence of the polarization state to result of interference, while abandoning
Deviation-rectifying system simplifies the lengthy and jumbled degree of system, also reduces production cost, in addition, this system only needs to use two-way single-photon detecting
It surveys device and carries out detection processing, further reduced the lengthy and jumbled degree of system, reduce production cost.
Claims (3)
1. a kind of quantum key dispatching system based on two-way polarization compensation, including common end, transmitting terminal and receiving terminal, feature
It is：The common end includes the identical synchronizing signal light emitting unit of two-way and signal light emitting unit, the synchronous letter
Number light emitting unit includes synchronous laser, circulator and common end wavelength division multiplexer, and the synchronous laser front end connects
A synchronization signal driver is connect, the output end of synchronous laser connects circulator first port, the second port connection of circulator
The third port of common end wavelength division multiplexer input terminal, circulator connects the first polarization-maintaining beam splitter；The signal light emitting unit
Including signal laser, AMZ interference rings, the first polarization beam apparatus, the second polarization beam apparatus, the second polarization-maintaining beam splitter, the first list
Photon detector and the second single-photon detector, the first polarization-maintaining beam splitter output end connection signal laser, the letter
Number laser output connects AMZ interference rings, and the output end of the AMZ interference rings is separately connected the first polarization beam apparatus and second
Polarization beam apparatus, first polarization beam apparatus connect two-way single photon with the second polarization beam apparatus by the second polarization-maintaining beam splitter
The output end of detector, two-way common end wavelength division multiplexer is separately connected transmitting terminal and receiving terminal, and the transmitting terminal includes transmitting
It holds wavelength division multiplexer and transmitting terminal faraday mirror connected to it, transmitting terminal phase compensation ring, the receiving terminal includes respectively
Receiving terminal wavelength division multiplexer and respectively receiving terminal faraday mirror connected to it, receiving terminal phase compensation ring.
2. the quantum key dispatching system as described in claim 1 based on two-way polarization compensation, which is characterized in that the transmitting
Hold phase compensation ring consistent with receiving terminal phase compensation ring structure, which respectively includes third polarization beam apparatus, the
One intensity modulator, first phase modulator, the second intensity modulator, second phase modulator, the third polarization beam apparatus
Front end connects transmitting terminal wavelength division multiplexer or receiving terminal wavelength division multiplexer by attenuator, the third polarization beam apparatus it is vertical
Component end is sequentially connected the first intensity modulated, second phase modulator, and the horizontal component end of the third polarization beam apparatus is successively
Even first phase modulator, the second intensity modulator, the second phase modulator are connect with the second intensity modulator.
3. the quantum key dispatching system as claimed in claim 2 based on two-way polarization compensation, which is characterized in that the first intensity
Modulator and the second intensity modulator include the 4th polarization beam apparatus, third phase modulator and modulator faraday mirror, institute
It states the 4th polarization beam apparatus and connects third phase modulator by long-armed connection modulator faraday mirror, by galianconism, and modulate
Device faraday mirror connect cyclization with third phase modulator.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820371774.9U CN207968509U (en) | 2018-03-19 | 2018-03-19 | A kind of quantum key dispatching system based on two-way polarization compensation |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108173655A (en) * | 2018-03-19 | 2018-06-15 | 云南天衢量子科技有限公司 | A kind of quantum key dispatching system based on two-way polarization compensation |
| WO2020151219A1 (en) * | 2019-01-25 | 2020-07-30 | 深圳市亘讯量子信息技术有限公司 | Integrated optical emitting device for quantum key distribution |
| CN113422653A (en) * | 2021-06-18 | 2021-09-21 | 广西大学 | Quantum communication system without polarization feedback and quantum secure direct communication method |
-
2018
- 2018-03-19 CN CN201820371774.9U patent/CN207968509U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108173655A (en) * | 2018-03-19 | 2018-06-15 | 云南天衢量子科技有限公司 | A kind of quantum key dispatching system based on two-way polarization compensation |
| WO2020151219A1 (en) * | 2019-01-25 | 2020-07-30 | 深圳市亘讯量子信息技术有限公司 | Integrated optical emitting device for quantum key distribution |
| CN113422653A (en) * | 2021-06-18 | 2021-09-21 | 广西大学 | Quantum communication system without polarization feedback and quantum secure direct communication method |
| CN113422653B (en) * | 2021-06-18 | 2022-08-09 | 广西大学 | Quantum communication system without polarization feedback and quantum secure direct communication method |
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