CN201623717U - Synchronous device for quantum cipher key distribution - Google Patents
Synchronous device for quantum cipher key distribution Download PDFInfo
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- CN201623717U CN201623717U CN201020112222XU CN201020112222U CN201623717U CN 201623717 U CN201623717 U CN 201623717U CN 201020112222X U CN201020112222X U CN 201020112222XU CN 201020112222 U CN201020112222 U CN 201020112222U CN 201623717 U CN201623717 U CN 201623717U
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Abstract
The utility model relates to a synchronous device for quantum cipher key distribution, a signal output terminal of a synchronous signal coding module is connected with a signal input terminal of a synchronous laser transmitting module; a signal output terminal of the synchronous laser transmitting module is connected with a signal input terminal of a comparator circuit module by optical fibers; a photodetector and a signal output terminal of the comparator circuit module respectively together with a adjustable delay circuit module for generating a gate control signal and adjusting the delay and one frame counter are used for counting, a synchronous checking output for coding the synchronous information is connected with a signal input terminal of the coding module. The utility model provides a high-performance quantum cipher key distribution device, which implements accurate synchronization of system both parties via transmitting signal light and synchronizing light by one optical fiber in a system with dozens of M frequency, and can real time resynchronize under the condition that the synchronization is lost, thereby improving the fault tolerant capability of the system.
Description
Technical field
The utility model relates to the quantum secret communication device, is specifically related to quantum key distribution device.
Background technology
A key technology of quantum key distribution system is the synchronous of transmit leg and recipient's information, has had only the information synchronization comparison to go up, and just can carry out follow-up cipher key-extraction work, and the removal dark counts that requirement simultaneously can be tried one's best is to reduce the error rate.Because whole system requires to work under high accuracy, the information precise synchronization need be guaranteed.Accurate for the bonding photon counting need be sent to receiving terminal accurately with the synchronizing signal of transmitting terminal, and keeps synchronously with the detecting signal of single-photon detector.If the synchronism of photon is good more, then single photon counting is accurate more, and the dark counts that can remove is also just many more, and the performance of quantum key distribution system is also just good more.
At present, finished the experiment of many quantum key distribution both at home and abroad, a kind of atomic clock that is to use carries out synchronously, this kind method of synchronization generally is to use second signal to carry out synchronously, for frequency is several million even tens system, and using a second signal Synchronization is thicker scheme, and can't accomplish the good synchronism of both sides, and because atomic clock is relatively more expensive, so comparing of usefulness is less.Another is to use simple phototiming, uses the transmission of an optical fiber as synchronizable optical specially, and frequency also can be accomplished the same with the signal frequency of launching, but owing to use two optical fiber, another root has strengthened use cost greatly as the transmission of flashlight.
The utility model content
The purpose of this utility model is exactly at above-mentioned the deficiencies in the prior art, and a kind of high performance quantum key distribution device is provided.This device is to use optical fiber transmission signal light and synchronizable optical in tens the system in frequency, realize the both sides of system accurately synchronously, and can be synchronous again in real time under the situation of synchronization loss, promoted system survivability.
The utility model is achieved through the following technical solutions:
A kind of synchronizer that is used for quantum key distribution, be used for that synchronizing signal produces and the synchronizing signal coding module signal output part of coding be connected in order to the synchronous laser emitting module signal input part that produces synchronous laser; The signal output part of described synchronous laser emitting module is connected with the comparator circuit module by signal input that is used to screen with the photo-detector that is used for opto-electronic conversion by optical fiber; The signal output part of photo-detector and comparator circuit module is respectively with the adjustable delay circuit module that is used to produce gate-control signal and adjustable delay with use a frame counter to count, and detecting synchronously with the signal input part of coding module of encoding of synchronizing information is connected.
A kind of synchronizer that is used for quantum key distribution sends and the recipient detects and the built-in frame counter of coding module synchronously described, and synchronizing information and attitude information are encoded.
A kind of synchronizer that is used for quantum key distribution, described adjustable delay circuit module is made up of the thickness two-stage.
Advantage of the present utility model is the synchronizable optical signal is encoded, make can be very fast under the situation of synchronization loss synchronous again; Drive signal is carried out burst pulse be shaped, make the intensity of synchronizing signal only be a bit larger tham noise, reduce synchronizable optical influence to flashlight in Optical Fiber Transmission; Use an optical fiber to carry out the transmission of synchronizable optical and flashlight, simple, and greatly reduce cost; Use the high-performance discriminator circuit to finish the low signals collecting of rocking of weak synchronizing signal; The high precision wide range of delay circuit makes that the synchronous luminous energy after postponing is synchronous with flashlight exactly, effectively obtains signal-count.
Description of drawings
Accompanying drawing 1 is a modular structure block diagram of the present utility model.
Accompanying drawing 2 is the high-level schematic functional block diagram of the emission side in the utility model.
Accompanying drawing 4 is the high-level schematic functional block diagram of the recipient in the utility model.
Embodiment
Shown in accompanying drawing 1,2,3,4.
The utility model is used for the device of quantum key distribution, wherein, be used for that synchronizing signal produces and synchronizing signal coding module 1 signal output part of coding be connected in order to synchronous laser emitting module 2 signal input parts that produce synchronous laser; The signal output part of laser emitting module 2 is connected with comparator circuit module 3 signal input parts that are used to screen with the photo-detector 31 that is used for opto-electronic conversion by optical fiber synchronously; The signal output part of photo-detector 31 and comparator circuit module 3 is respectively with the adjustable delay circuit module 5 that is used to produce gate-control signal and adjustable delay with use a frame counter to count, and detecting synchronously with the signal input part of coding module 4 of encoding of synchronizing information is connected.
By synchronizing signal coding module 1, it is luminous to drive synchronous laser radiation module 2, and is coupled on the light path.At receiving terminal, synchronizable optical is separated from light path, surveys and screens 3 and carry out the synchronizable optical signals collecting through synchronizable optical.Because every road flashlight is by after electronics path and the light path, be different with respect to the time delay of synchronizable optical, therefore, make every road signal at the time window that forms on the photo-detector 31 about 1ns by synchronizing signal being carried out different delay control.Simultaneously the synchronizable optical signal enters frame synchronization and detects and coding module 43, and the signal of binding signal light carries out synchronous single photon counting, detects frame synchronizing signal simultaneously, utilizes this frame synchronizing signal, even under the situation of synchronization loss, still can be again synchronously on.
As shown in Figure 2, synchronizing signal detects the logic module of being write by hardware description language with coding module inside synchronously at transmit leg and produces, and be received the recipient, entering the recipient after screening by high accuracy and detect synchronously and coding module, base frequency is determined by the quantum state tranmitting frequency; Stop paying out several pulses after one section pulse train of every mistake, as shown in Figure 3, synchronizable optical is pressed the quantum tranmitting frequency and is generated, but it is not exclusively the same, middle every K pulse of crossing, stop paying out N pulse N＜＜K, be the synchronizing signal of the frame of unit as K+N, even so after losing synchronously somewhere, next frame can also be again synchronously on.Transmission and recipient are detecting and the built-in frame counter of coding module synchronously simultaneously, and synchronizing information and attitude information are encoded.Like this, even, also can recover synchronously by the information of frame counter owing to the wrong synchronization loss that causes in the synchronizing information transmittance process, occurring.The synchronous electric impulse signal that produces sends to laser.Because signal will be configured as the pulse about 1ns, so must use fast signal level standard.Laser emitting module at first uses level conversion 21 functions, is the TTL conversion of signals ECL signal, and enter burst pulse and be shaped 22, drive laser 23 emission synchronizable optical, synchronizable optical and flashlight are coupled to an Optical Fiber Transmission to the recipient.The synchronous signal impulse rising edge that is produced by transmit leg triggers, and produces synchronous laser pulse; The width-adjustable of light pulse; Synchronizable optical and attitude flashlight are sent to the recipient in same optical fiber.
Fig. 4 is recipient's a functional block diagram.Use 31 pairs of synchronizable optical of photo-detector to receive and enter examination 32 then.In order to prevent the interference of synchronizable optical to flashlight, the luminous power of synchronizable optical can be attenuated to very low level.After synchronizable optical arrives the recipient, be converted to the signal of telecommunication of difference through highly sensitive PIN-TIA detector.Receive this differential signal by high-sensitive quick comparator then, be converted to follow-up available level signal.Whole matching requirements has high sensitivity and low gitter.Carry out frame signal after the synchronizing signal that screens out received 42 and detect and encode 43, it is consistent with create-rule to detect rule, as shown in Figure 3, and in conjunction with detector the detectable signal of flashlight is encoded.Data behind the coding are carried out the extraction of key by cipher key-extraction interface 44.
If recipient's detector is operated under the GATE pattern, need determine the time that GATE opens by the attitude signal.Because there are some uncertain factors in transmit leg to recipient's quantum channel, the time that each attitude signal arrives is also inconsistent.With the synchronizing signal of attitude signal correction after screening, enter the circuit of adjustable delay, produce the needed gate-control signal of detector work.This adjustable delay circuit is made up of the thickness two-stage, makes that the time-delay adjustable range is wide, and the degree of regulation height; It is able to programme to delay time, whole delay be divided into pulse shaping 51, slightly delay time 52 and 54, four road circuit delay of carefully delaying time independent adjustable; Time-delay is provided with by time-delay control 57 and finishes.Pass through level conversion 55 shapings again through the synchronizing signal after the time-delay, pulse shaping 56 is input to detector.
Claims (3)
1. synchronizer that is used for quantum key distribution is characterized in that:
Be used for that synchronizing signal produces and the synchronizing signal coding module signal output part of coding be connected in order to the synchronous laser emitting module signal input part that produces synchronous laser;
The signal output part of described synchronous laser emitting module is connected with the comparator circuit module by signal input that is used to screen with the photo-detector that is used for opto-electronic conversion by optical fiber;
The signal output part of photo-detector and comparator circuit module is respectively with the adjustable delay circuit module that is used to produce gate-control signal and adjustable delay with use a frame counter to count, and detecting synchronously with the signal input part of coding module of encoding of synchronizing information is connected.
2. a kind of synchronizer that is used for quantum key distribution according to claim 1 is characterized in that: transmission and recipient detect and the built-in frame counter of coding module synchronously described, and synchronizing information and attitude information are encoded.
3. a kind of synchronizer that is used for quantum key distribution according to claim 1 is characterized in that: described adjustable delay circuit module is made up of the thickness two-stage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020112222XU CN201623717U (en) | 2010-02-04 | 2010-02-04 | Synchronous device for quantum cipher key distribution |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020112222XU CN201623717U (en) | 2010-02-04 | 2010-02-04 | Synchronous device for quantum cipher key distribution |
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| Publication Number | Publication Date |
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| CN201623717U true CN201623717U (en) | 2010-11-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201020112222XU Expired - Lifetime CN201623717U (en) | 2010-02-04 | 2010-02-04 | Synchronous device for quantum cipher key distribution |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103840905A (en) * | 2014-02-20 | 2014-06-04 | 安徽问天量子科技股份有限公司 | Full optical fiber communication system and method of QKD system |
| CN104468093A (en) * | 2013-09-18 | 2015-03-25 | 安徽量子通信技术有限公司 | Synchronous method of quantum key distribution system |
-
2010
- 2010-02-04 CN CN201020112222XU patent/CN201623717U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104468093A (en) * | 2013-09-18 | 2015-03-25 | 安徽量子通信技术有限公司 | Synchronous method of quantum key distribution system |
| CN103840905A (en) * | 2014-02-20 | 2014-06-04 | 安徽问天量子科技股份有限公司 | Full optical fiber communication system and method of QKD system |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
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| CP03 | Change of name, title or address |
Address after: 230088, D3, building 1, 4, 5, 6, 7, 800, Wangjiang Industrial Park, Wangjiang West Road, hi tech Zone, Anhui, Hefei Patentee after: QUANTUM COMMUNICATION TECHNOLOGY CO., LTD. Address before: 230088 No. 3, Tianyuan Road, Hefei hi tech Zone, Anhui 2, Building 102 Patentee before: Anhui Liangzi Communication Technology Co., Ltd. |
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20101103 |