CN206135937U - A automatic chronogenesis adjusting device for quantum key distribution system - Google Patents
A automatic chronogenesis adjusting device for quantum key distribution system Download PDFInfo
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- CN206135937U CN206135937U CN201621257272.0U CN201621257272U CN206135937U CN 206135937 U CN206135937 U CN 206135937U CN 201621257272 U CN201621257272 U CN 201621257272U CN 206135937 U CN206135937 U CN 206135937U
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Abstract
The utility model provides an automatic chronogenesis adjusting device for quantum key distribution system, quantum terminal equipment's transmit leg includes the luminous drive control unit that connects gradually in the quantum key distribution system, the time delay chip, the laser instrument, the FPGA that the recipient examineed the module and connected gradually including synchronous light, time measuring unit TDC, single -photon detector, the synchronous light signal port of transmit leg is connected to recipient smooth signal port in step, transmit leg pilot light signal port is connected to recipient's pilot light signal port, the transmit leg is connected to respectively on respective switch with the recipient, the synchronous light pulse that the transmit leg sent is examineed by recipient's synchronization light and is sent into time measuring unit TDC after the module is received, after being detected by recipient's single -photon detector, pilot light pulse that the transmit leg sent sends into time measuring unit TDC. The utility model has the advantages of it is following: make full use of has quantum terminal equipment now, need not any auxiliary assembly, realizes the adjustment of automatic chronogenesis, need not artificial intervention in the chronogenesis adjustment procedure.
Description
Technical field
This utility model is related to a kind of automatic timing adjustment method and device, especially it is a kind of for quantum key distribution system from
Dynamic timing adjustment method and device.
Background technology
Technique on Quantum Communication with single photon as information carrier, with optical fiber as quantum channel, the uncertainty principle of quantum theory,
The unclonable principle of unknown quantum state ensure that quantum communications become a kind of communication mode of unconditional security.With quantum theory
With the development of technology, quantum key distribution (QKD) system become a ripe technology, and quantum key distribution terminal unit is made
For key link in system, its stable performance, safety are most important.
QKD system sender in order that listener cannot obtain sender transmission status information, need signalling state light
With inveigle state light, and make signal Tai Xiage road light and inveigle Tai Xiage road light send out at the exit same moment,
I.e. ideally each road optical signal is completely superposed on time coordinate axle, as shown in Figure 1.But actual QKD system Zhong Ge roads
Due to the difference of transmission path between optical signal, obvious time interval is had when recipient is reached, as shown in Fig. 2 this meeting
Certain break-up value is provided to listener-in, system has potential safety hazard.It is therefore desirable to must be each in QKD system sender
Road optical signal carries out sequential adjustment so that it is currently which optical signal is reached on earth that listener-in can not differentiate.
Fig. 3 is the typical schematic diagram for manually realizing the adjustment of optical signal sequential in prior art, first by synchronizable optical
Signal and signal optical signal are connected respectively on high-precision oscillograph, measure each road flashlight relative between synchronizable optical when
Between be spaced, its form of expression be with synchronizable optical as trigger condition under position deviation of the flashlight on oscilloscope display interface,
Then manually count position deviation that each road flashlight shown on oscillograph and thus calculate prolonging needed for each road optical signal
When the time, finally manually each road delay value is manually entered in upper computer software, delay value is issued by serial ports or network interface and is arrived
In luminous drive control unit.After delay value is issued, need again with high accuracy oscillograph measure between each road optical signal when
Between be spaced, manually calculate the delay time that needs next time and pass through in being manually entered into PC control software again network interface or
Serial ports carries out second delay value and issues, and so circulates, until after any two ways of optical signals time difference is less than given technical specification
Stop.
Obviously, existing timing adjustment method and device is suffered from the drawback that：
1. error probability is big.Need artificial constantly measurement, calculate, constantly issue delay value manually, and measure, calculate, under
In sending out delay value, each link is likely to error.
2. need to be by auxiliary equipment.External auxiliaries a series of by PC, oscillograph etc. are needed during whole sequential adjustment
Equipment.
3. high cost.High-precision oscillograph (subsidiary high-quality light probe) is expensive.
4. labor intensive.Measure, calculate, issuing each link such as delay value and be required for artificial participation.
5. in-convenience in use.High-precision oscillograph is typically all huger, not easily shifted, when debugging at the scene, typically
Difficulty will not can be brought to debugging with this large-scale oscillograph.
6. efficiency is low.When quantum key distribution terminal unit is more, work efficiency can be had a strong impact on.
7. precision is low.The precision of sequential adjustment depends on the oscillographic performance for test.
Utility model content
Technical problem to be solved in the utility model there are provided a kind of without the need for external accessory, sequential adjustment essence
Degree is high, the automatic timing adjustment method and device that error probability is low, and the efficiency of sequential adjustment, Neng Gouman are improved while reduces cost
Sequential adjustment requirement in sufficient quantum key distribution system.
This utility model is to solve above-mentioned technical problem by the following technical programs：It is a kind of to be used for quantum key distribution system
The automatic timing adjustment method and device of system, including the recipient of quantum terminal unit and quantum terminal set in quantum key distribution system
Standby sender, luminous drive control unit that the sender of quantum terminal unit includes being sequentially connected, delay chip, laser
Device, wherein be joined directly together with luminous drive control unit for sending the laser instrument of synchronous light pulse, quantum terminal unit connects
Debit includes that synchronizable optical screens module and the FPGA being sequentially connected, time measuring unit TDC, single-photon detector, quantum end
Sender's synchronizable optical signal port of end equipment is connected to recipient's synchronizable optical signal port of quantum terminal unit by optical fiber,
Sender's flashlight signal port of quantum terminal unit is connected to recipient's flashlight letter of quantum terminal unit by optical fiber
Number port, the sender of quantum terminal unit and the recipient of quantum terminal unit are connected respectively on respective switch, are sent out
The START that time measuring unit TDC is sent into after module is received is screened in the synchronous light pulse that the side of sending sends by the synchronizable optical of recipient
Input, the signal pulse that sender sends send into time measuring unit after being detected by the single-photon detector of recipient
The STOP inputs of TDC.
Alternatively, time measuring unit TDC measurement model selection be single ended input pattern or
Differential Input pattern.
Optimization, the automatic timing adjustment method and device for being used for quantum key distribution system also includes optical modulator, signal
Light pulse enters detector after optical modulator, and optical modulator is connected to FPGA.
Used as the technical scheme of optimization, the optical modulator includes high pressure generation module and electric Polarization Controller EPC, high
Pressure generation module input connection FPGA, the electric Polarization Controller EPC of outfan connection, signal pulse is through electric Polarization Controller
Detector is entered after EPC.
The detector can be any one detector on the recipient of quantum terminal unit.
The electric Polarization Controller EPC can be any one the electric Polarization Controller on the recipient of quantum terminal unit
EPC。
As a specific scheme, there are 4 detectors, on the recipient of quantum terminal unit used in device wherein
Any one detector.
It it is 4 groups as a specific scheme, the delay chip and for the laser instrument of sending signal light pulse.
Used as a specific scheme, the electric Polarization Controller EPC on the recipient of quantum terminal unit is 2.
This utility model has advantages below compared to existing technology：This automatic timing adjustment method and device makes full use of existing quantum
Terminal unit, without the need for any auxiliary equipment, without the need for manual intervention during sequential adjustment, carries out automatically, saves human resourcess,
Cause control accuracy high plus using high precision time interval measurement chip.During whole sequential adjustment, delay value all passes through
FPGA is issued Jing after strict data processing, it is ensured that the accuracy rate during sequential adjustment.Need not be with the use of bulky
High accuracy oscillograph, the demand of outfield debugging can be met, and cost is effectively reduced.At large scale quantities quantum key distribution end
When end equipment needs sequential to adjust, the efficiency of sequential adjustment is improve.
Description of the drawings
Fig. 1 is design sketch after preferable multipath light signal sequential adjustment.
Fig. 2 is the multipath light signal design sketch without sequential Accommodation.
Fig. 3 is that optical signal sequential adjustment schematic diagram is manually realized in prior art.
It is automatic in the quantum key distribution system of state BB84 agreement, polarization encoder that Fig. 4 is that this utility model is used to inveigling
Block diagram is realized in sequential adjustment.
Specific embodiment
Below embodiment of the present utility model is elaborated, the present embodiment is with technical solutions of the utility model as front
Put and implemented, give detailed embodiment and specific operating process, but protection domain of the present utility model is not limited
In following embodiments.
Fig. 4 is used for automatic in the quantum key distribution system for inveigle state BB84 agreement, polarization encoder for this utility model
Block diagram is realized in sequential adjustment, and all devices in block diagram are all present in actual quantum terminal unit, i.e., this utility model is used for
Deposit in used module entirely existing quantum terminal unit in the automatic timing adjustment method and device of quantum key distribution system
Ripe scheme.
This is used for the automatic timing adjustment method and device of quantum key distribution system, including quantum end in quantum key distribution system
The recipient of end equipment and the sender of quantum terminal unit, the sender of quantum terminal unit include that what is be sequentially connected lights
Drive control unit, delay chip, laser instrument, wherein for sending the laser instrument of synchronous light pulse with luminous drive control unit
It is joined directly together, the recipient of quantum terminal unit includes that synchronizable optical screens module and the FPGA being sequentially connected, measure of time list
First TDC, single-photon detector, sender's synchronizable optical signal port of quantum terminal unit are connected to quantum terminal by optical fiber and set
Standby recipient's synchronizable optical signal port, sender's flashlight signal port of quantum terminal unit are connected to quantum by optical fiber
Recipient's flashlight signal port of terminal unit, the sender of quantum terminal unit are distinguished with the recipient of quantum terminal unit
It is connected on respective switch, the synchronous light pulse that sender sends is screened after module is received by the synchronizable optical of recipient and sent into
The START inputs of time measuring unit TDC, the signal pulse that sender sends are detected by the single-photon detector of recipient
To the STOP inputs of rear feeding time measuring unit TDC.
Alternatively, time measuring unit TDC measurement model selection be single ended input pattern or
Differential Input pattern.
Optimization, the automatic timing adjustment method and device for being used for quantum key distribution system also includes optical modulator, signal
Light pulse enters detector after optical modulator, and optical modulator is connected to FPGA.
Used as the technical scheme of optimization, the optical modulator includes high pressure generation module and electric Polarization Controller EPC, high
Pressure generation module input connection FPGA, the electric Polarization Controller EPC of outfan connection, signal pulse is through electric Polarization Controller
Detector is entered after EPC.
The detector can be any one detector on the recipient of quantum terminal unit.
The electric Polarization Controller EPC can be any one the electric Polarization Controller on the recipient of quantum terminal unit
EPC。
The concrete set-up procedure that this is used for the automatic timing adjustment method and device of quantum key distribution system is as follows：
Step 1：Quantum terminal unit (sender) synchronizable optical signal port is connected to quantum terminal unit by optical fiber and (connects
Debit) synchronizable optical signal port.
Step 2：Quantum terminal unit (sender) flashlight signal port is connected to quantum terminal unit by optical fiber and (connects
Debit) flashlight signal port.
Step 3：Quantum terminal unit (sender) is connected respectively to respective exchange with quantum terminal unit (recipient)
On machine.
Step 4：It is that the time interval between any two paths of signals light is less than 20ps to arrange sequential and adjust qualified judge index,
The model selection of TDC measurements is differential signal input pattern.TDC input signals can select to be that single ended input or difference are defeated
Enter, select as Differential Input in high precision, this specific embodiment during Differential Input.
Step 5：The frequency for arranging synchronizable optical electric drive signal is 200KHz, and 8 road flashlights of sequential adjustment are treated in setting
Electric drive signal frequency is 200KHz.The frequency size of synchronizable optical and 8 road flashlight electric drive signals will be consistent, frequency model
Enclose be synchronizable optical in 1Hz～1MHz, this specific embodiment and flashlight electric drive signal frequency configuration be that 200KHz is typical case
Value.
Step 6：The initial time delay value for arranging each road delay chip is 0.
Step 7：Quantum terminal unit (sender) is according to the 200KHz synchronizable opticals and flashlight electric drive letter for pre-setting
Number laser instrument is made to send the synchronizable optical and signal pulse of respective frequencies.
Step 8：The synchronized light of synchronous optical signal screens the START inputs that module is connected to time-interval-unit TDC
End, as initial signal；FPGA on quantum terminal unit (recipient) (is believed including 4 kinds according to the quantum state of signal pulse
Number state and corresponding inveigle state) control high pressure generation module produces specific EPC high pressure to guarantee the flashlight of every kind of quantum state
Pulse can be detected by same detector, and the output of detector is connected to the STOP inputs of time-interval-unit TDC,
Used as stop signal, time-interval-unit TDC measures the time interval between each road flashlight and synchronizable optical.This practicality is new
In type, detector used can be any one in four detectors, and EPC used can be any one in two EPC,
Detector D1 and EPC1 are selected in the present embodiment.
Step 9：FPGA reads the time interval between each road flashlight and synchronizable optical, by data processing, is converted into each
Time interval between the flashlight of road, the time delay 100ps on the basis of wherein all the way, each road flashlight in this benchmark time delay according to
Time interval relation between each road flashlight enters line delay.
Step 10：Each road delay value is sent to luminous on quantum terminal unit (sender) by FPGA by classical channel
Drive control unit, luminous drive control unit are handed down to the corresponding delay chip in each road further according to the size of each road delay value,
Delay value delayed luminescence of the time delay electric drive signal Shi Ge road laser instrument according to setting.
Step 11：After a delays time to control, repeat step 8～10 constantly measures each road flashlight by TDC
Relative to the time interval between synchronizable optical, Jing FPGA carry out data processing, constantly adjust the delay value needed for each road flashlight,
So circulate, the time interval between each road flashlight can be less and less, until the time interval between any two paths of signals light
Stop less than after given technical specification, after stopping the adjusted value on final each road is recorded in quantum terminal unit (sender)
In read only memory, so far whole sequential adjustment process is completed.
It should be noted that 8 road flashlights in the present embodiment are corresponding with the trick state BB84 agreement for being adopted,
And the QKD system of reality is not limited to 8 road flashlights；For the QKD system using other coded systems, encode for example with six states
QKD system, as long as sender using multi-laser scheme have conjunction beam demand, and recipient can use TDC QKD systems
System, can realize automatic sequential adjustment using the technical solution of the utility model.In addition, four spies are employed in the present embodiment
Device is surveyed, and the QKD system of reality is also not necessarily limited to this, even if only with a detector, being also energy using the method for time-sharing multiplex
Detection to multiple signals is realized enough.Further, the high pressure generation module and EPC in the present embodiment is for carrying out to flashlight
Polarization Control, and the QKD system not limited to this of reality, as long as can realize adjusting flashlight under the control of FPGA
The optical modulator of system, goes for the technical solution of the utility model.
Preferred embodiment of the present utility model is the foregoing is only, it is not to limit this utility model, all at this
Any modification, equivalent and improvement made within the spirit and principle of utility model etc., should be included in this utility model
Protection domain within.
Claims (9)
1. a kind of automatic timing adjustment method and device for quantum key distribution system, including quantum end in quantum key distribution system
The recipient of end equipment and the sender of quantum terminal unit, the sender of quantum terminal unit include that what is be sequentially connected lights
Drive control unit, delay chip, laser instrument, wherein for sending the laser instrument of synchronous light pulse with luminous drive control unit
It is joined directly together, the recipient of quantum terminal unit includes that synchronizable optical screens module and the FPGA being sequentially connected, measure of time list
First TDC, single-photon detector, it is characterised in that sender's synchronizable optical signal port of quantum terminal unit is connected by optical fiber
To recipient's synchronizable optical signal port of quantum terminal unit, sender's flashlight signal port of quantum terminal unit is by light
Fibre is connected to recipient's flashlight signal port of quantum terminal unit, sender and the quantum terminal unit of quantum terminal unit
Recipient be connected respectively on respective switch, sender send synchronous light pulse by recipient synchronizable optical screen mould
Block sends into the START inputs of time measuring unit TDC after receiving, the signal pulse that sender sends is by the monochromatic light of recipient
Sub- detector sends into the STOP inputs of time measuring unit TDC after detecting.
2. the automatic timing adjustment method and device for quantum key distribution system according to claim 1, it is characterised in that when
Between the model selection of measuring unit TDC measurement be single ended input pattern or Differential Input pattern.
3. the automatic timing adjustment method and device for quantum key distribution system according to claim 1, it is characterised in that also
Including optical modulator, signal pulse enters detector after optical modulator, and optical modulator is connected to FPGA.
4. the automatic timing adjustment method and device for quantum key distribution system according to claim 3, it is characterised in that institute
Stating optical modulator includes high pressure generation module and electric Polarization Controller EPC, high pressure generation module input connection FPGA, output
The electric Polarization Controller EPC of end connection, signal pulse enter detector after electric Polarization Controller EPC.
5. the automatic timing adjustment method and device for quantum key distribution system according to claim 1, it is characterised in that institute
State any one detector on the recipient that detector is quantum terminal unit.
6. the automatic timing adjustment method and device for quantum key distribution system according to claim 4, it is characterised in that institute
State any one the electric Polarization Controller EPC on the recipient that electric Polarization Controller EPC is quantum terminal unit.
7. the automatic timing adjustment method and device for quantum key distribution system according to claim 1, it is characterised in that amount
There is on the recipient of sub- terminal unit 4 detectors, wherein any one detector used in device.
8. the automatic timing adjustment method and device for quantum key distribution system according to claim 1, it is characterised in that institute
It is 4 groups to state delay chip and the laser instrument for sending signal light pulse.
9. the automatic timing adjustment method and device for quantum key distribution system according to claim 4, it is characterised in that amount
Electric Polarization Controller EPC on the recipient of sub- terminal unit is 2.
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| CN201621257272.0U CN206135937U (en) | 2016-11-15 | 2016-11-15 | A automatic chronogenesis adjusting device for quantum key distribution system |
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| CN201621257272.0U CN206135937U (en) | 2016-11-15 | 2016-11-15 | A automatic chronogenesis adjusting device for quantum key distribution system |
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| CN108075886A (en) * | 2016-11-15 | 2018-05-25 | 上海国盾量子信息技术有限公司 | A kind of automatic timing adjusting method and device for quantum key distribution system |
| CN108540250A (en) * | 2018-04-23 | 2018-09-14 | 佛山市顺德区德雅军民融合创新研究院 | A kind of star based on laser pulse ground quantum key distribution rapid time synchronous method |
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| CN109962771A (en) * | 2017-12-14 | 2019-07-02 | 科大国盾量子技术股份有限公司 | Silicon-based monolithic integrates quantum key distribution recipient chip structure and its encapsulating structure |
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| CN107196715A (en) * | 2017-07-28 | 2017-09-22 | 浙江九州量子信息技术股份有限公司 | A kind of quantum key dispatching system modulated based on interference ring single-phase and method |
| CN109683171A (en) * | 2017-10-19 | 2019-04-26 | 上海禾赛光电科技有限公司 | Laser radar and its distance measuring method |
| CN109962771A (en) * | 2017-12-14 | 2019-07-02 | 科大国盾量子技术股份有限公司 | Silicon-based monolithic integrates quantum key distribution recipient chip structure and its encapsulating structure |
| CN109962771B (en) * | 2017-12-14 | 2024-03-12 | 科大国盾量子技术股份有限公司 | Silicon-based monolithic integrated quantum key distribution receiver chip |
| CN108540250A (en) * | 2018-04-23 | 2018-09-14 | 佛山市顺德区德雅军民融合创新研究院 | A kind of star based on laser pulse ground quantum key distribution rapid time synchronous method |
| US11212012B2 (en) * | 2018-12-28 | 2021-12-28 | Beijing Zhongchuangwei Quantum Communication Technological Company, Ltd. | Method and device for synchronizing high-speed quantum key generation system |
| CN110011939B (en) * | 2019-04-12 | 2021-06-01 | 无锡中金鼎讯信通科技股份有限公司 | Ethernet switch supporting quantum key to encrypt data |
| CN110011939A (en) * | 2019-04-12 | 2019-07-12 | 无锡中金鼎讯信通科技股份有限公司 | A kind of support quantum key progress data encryption Ethernet switch |
| CN112653549A (en) * | 2019-10-11 | 2021-04-13 | 科大国盾量子技术股份有限公司 | Light-emitting data driving interface standard circuit based on quantum key distribution controller |
| CN112653549B (en) * | 2019-10-11 | 2022-05-20 | 科大国盾量子技术股份有限公司 | Light-emitting data driving interface standard circuit based on quantum key distribution controller |
| CN112104428B (en) * | 2019-11-28 | 2022-03-08 | 科大国盾量子技术股份有限公司 | Research and development platform for quantum communication photoelectric chip technology |
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Address after: 201319 room 611, Plaza 100, Shanghai Road, Pudong New Area, China Co-patentee after: QUANTUM COMMUNICATION TECHNOLOGY CO., LTD. Patentee after: Shanghai shield Quantum Information Technology Co., Ltd. Address before: 201315 Pudong New Area, Shanghai Pu Pu Road, No. 99 Co-patentee before: QUANTUM COMMUNICATION TECHNOLOGY CO., LTD. Patentee before: Shanghai shield Quantum Information Technology Co., Ltd. |
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