CN104468093A - Synchronous method of quantum key distribution system - Google Patents
Synchronous method of quantum key distribution system Download PDFInfo
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- CN104468093A CN104468093A CN201310434862.0A CN201310434862A CN104468093A CN 104468093 A CN104468093 A CN 104468093A CN 201310434862 A CN201310434862 A CN 201310434862A CN 104468093 A CN104468093 A CN 104468093A
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Abstract
The invention belongs to the field of quantum secret communication technologies and particularly relates to a synchronous method of a quantum key distribution system. The synchronous method comprises the following steps that a sender sends synchronous light and signal light, the frequency of the synchronous light is far smaller than that of the signal light, two frequencies have multiplied relationship, and the synchronous light and the signal light are both transmitted in one optical fiber; the synchronous light is converted to a synchronous electric signal, frequency multiplication is carried out on the synchronous electric signal to obtain the frequency which is the same as the signal light, and the synchronous electric signal is output through a delay module as a gate control signal of a photon detector of a receiver; the signal light enters the photon detector of the receiver and is detected in the valid time of the gate control signal of the detector; and the synchronous electric signal output through the delay module and the output signal of the photon detector of the receiver enter a data processing module of the receiver to carry out follow-up processing. According to the synchronous method, the influence of the synchronous light on the signal light can be reduced, the normal gate control signal of the detector is guaranteed and the code rate of the QKD (Quantum Key Distribution) system can be effectively improved.
Description
Technical field
The invention belongs to Quantum Secure Communication field, be specifically related to a kind of synchronous method of quantum key distribution system.
Background technology
Quantum communications are the communication modes of the unconditional security in theory of generally acknowledging at present, have huge application prospect, but quantum key becomes the lower key factor being restriction quantum communications and applying of code check, therefore needs to try every possible means to improve into code check.The mode generally taked has two kinds: increasing amount quantum key distribution (QKD) system operating frequency, improves the detection efficient of single-photon detector.Under existing detection condition, improve QKD system operating frequency, need corresponding synchro system support.
The function of synchro system makes the light pulse of transmit leg and recipient can one_to_one corresponding, completes position comparison process.The synchronizing function of QKD needs to transmit synchronizable optical and flashlight, usually synchronizable optical and flashlight is carried out with keeping pouring in defeated in same optical fiber, such synchronizable optical and flashlight is affected by environment is consistent, and can save optical fiber cost.
Because synchronizable optical and flashlight are with frequently transmitting in same optical fiber, and synchronizable optical is high light, flashlight is single photon signal, therefore synchronizable optical easily produces larger impact (being mainly Rayleigh scattering, Raman scattering etc.) to flashlight, concrete influence degree is relevant with the intensity of synchronizable optical, and general light intensity is larger, affects larger.This can cause the increase of QKD system mistake rate, the final one-tenth code check reducing QKD system.
The impact of synchronizable optical on flashlight can be reduced by the light intensity reducing synchronizable optical, but synchronizable optical intensity can not be fallen too low, this is because the photodetector of synchronizable optical has the restriction of sensitivity, if synchronizable optical intensity is reduced near detector sensitivity, the detection difficulty of synchronizable optical can be caused even to lose, and this is fatal to system synchronization.Therefore, ensure that synchronizable optical can be detected exactly, synchronizable optical needs a suitable light intensity.
In addition, because synchronizable optical and flashlight are with frequently, if take the mode of promotion signal light transmission rate to improve the one-tenth code check of QKD system, then speed promotes amplitude and because synchronizable optical be restricted the impact increase of flashlight, thus can restrict the raising of QKD system operating frequency.
Summary of the invention
For solving the problems of the technologies described above, the present invention proposes a kind of synchronous method of quantum key distribution system, and the method can reduce the impact of synchronizable optical on flashlight, and ensures the normal gate-control signal of detector, effectively can improve QKD system and become code check.
The synchronous method of described a kind of quantum key distribution system, comprises the following steps:
1) transmit leg sends synchronizable optical and flashlight, and synchronizable optical frequency is much smaller than flashlight frequency, and two frequencies become multiple proportion, and synchronizable optical and flashlight all transmit in same optical fiber;
2) synchronizable optical is converted to synchronous electric signal;
3) by the frequency that synchronous electric signal frequency multiplication is extremely identical with flashlight, then export, as the gate-control signal of recipient's single-photon detector through time delay module;
4) flashlight enters recipient's single-photon detector, is detected within the effective time of detector gate-control signal;
5) through the synchronous electric signal of time delay module output and the output signal of recipient's single-photon detector, enter receiving side data processing module and carry out subsequent treatment.
Further, described frequency multiplication is realized by low jitter frequency multiplier.
Preferably, described low jitter frequency multiplier is phase-locked loop.
The invention has the beneficial effects as follows:
1., when the luminous speed of identical flashlight, the synchronous luminous energy sending low frequency reduces the impact of synchronizable optical on flashlight greatly, thus effective control QKD system mistake rate, improve QKD system and become code check;
2. produce the detector gate-control signal consistent with flashlight frequency by frequency multiplication mode, ensure that the normal work of single-photon detector;
3. the lifting of this synchronous method supporting signal light frequency, under the condition that synchronizable optical frequency is constant, flashlight can be promoted to higher frequency, thus supports high speed QKD system, improves QKD system and becomes code check.
Accompanying drawing explanation
By the description carried out its exemplary embodiment below in conjunction with accompanying drawing, the above-mentioned feature and advantage of the present invention will become apparent and easy understand.
Fig. 1 is the synchronous method schematic diagram of quantum key distribution system of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in detail.
Fig. 1 is the synchronous method schematic diagram of quantum key distribution system of the present invention, and for 100kHz synchronizing signal and 20MHz flashlight, specific works step of the present invention is as follows:
1. transmit leg sends 100kHz synchronizable optical and 20MHz flashlight, and the two all transmits in same optical fiber;
2. synchronizable optical is after opto-electronic conversion (being photoelectric tube in the present embodiment), generates 100kHz synchronous electric signal;
3.100kHz synchronous electric signal through low jitter frequency multiplier (being phase-locked loop in the present embodiment) frequency multiplication to 20MHz synchronous electric signal, then through time delay module export, as the gate-control signal of recipient's single-photon detector;
4.20MHz flashlight enters recipient's single-photon detector, is detected within the effective time of 20MHz detector gate-control signal;
5., through the synchronous electric signal of time delay module output and the output signal of recipient's single-photon detector, enter receiving side data processing module and carry out subsequent treatment (position is than equivalent process).
In sum, the present invention is when the luminous speed of identical flashlight, and the synchronous luminous energy sending low frequency reduces synchronizable optical greatly to be affected flashlight, thus effective control QKD system mistake rate, improve QKD system and become code check; Based on the lifting of the QKD system supporting signal light frequency of this method of synchronization, under the condition that synchronizable optical frequency is constant, flashlight can be promoted to higher frequency, thus supports high speed QKD system, improves QKD system and becomes code check.In addition, the present invention produces the detector gate-control signal consistent with flashlight frequency by frequency multiplication mode, ensure that the normal work of single-photon detector.
It should be noted that above-mentioned specific embodiment is exemplary, under above-mentioned instruction of the present invention, those skilled in the art can carry out various improvement and distortion on the basis of above-described embodiment, and these improve or distortion drops in protection scope of the present invention.
It will be understood by those skilled in the art that specific descriptions are above to explain object of the present invention, not for limiting the present invention.Protection scope of the present invention is by claim and equivalents thereof.
Claims (3)
1. a synchronous method for quantum key distribution system, comprises the following steps:
1) transmit leg sends synchronizable optical and flashlight, and synchronizable optical frequency is much smaller than flashlight frequency, and two frequencies become multiple proportion, and synchronizable optical and flashlight all transmit in same optical fiber;
2) synchronizable optical is converted to synchronous electric signal;
3) by the frequency that synchronous electric signal frequency multiplication is extremely identical with flashlight, then export, as the gate-control signal of recipient's single-photon detector through time delay module;
4) flashlight enters recipient's single-photon detector, is detected within the effective time of detector gate-control signal;
5) through the synchronous electric signal of time delay module output and the output signal of recipient's single-photon detector, enter receiving side data processing module and carry out subsequent treatment.
2. the synchronous method of a kind of quantum key distribution system as claimed in claim 1, is characterized in that: described frequency multiplication is realized by low jitter frequency multiplier.
3. the synchronous method of a kind of quantum key distribution system as claimed in claim 2, is characterized in that: described low jitter frequency multiplier is phase-locked loop.
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| CN201310434862.0A CN104468093A (en) | 2013-09-18 | 2013-09-18 | Synchronous method of quantum key distribution system |
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Cited By (8)
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| CN106768320A (en) * | 2017-01-13 | 2017-05-31 | 中国科学技术大学 | Significantly gate single-photon detection system at a high speed |
| CN107024289A (en) * | 2017-04-13 | 2017-08-08 | 华中师范大学 | A kind of single-photon detector of low time jitter |
| CN107196758A (en) * | 2017-06-01 | 2017-09-22 | 浙江九州量子信息技术股份有限公司 | A kind of single photon detection method based on quantum key distribution |
| WO2018196585A1 (en) * | 2017-04-24 | 2018-11-01 | 华为技术有限公司 | Signal receiving apparatus and receiving method |
| CN111385094A (en) * | 2018-12-28 | 2020-07-07 | 北京中创为量子通信技术有限公司 | High-speed quantum key generation system synchronization method and device |
| CN113541819A (en) * | 2020-12-30 | 2021-10-22 | 广东国腾量子科技有限公司 | Time synchronization system for quantum key distribution |
| CN114268421A (en) * | 2021-12-17 | 2022-04-01 | 安徽问天量子科技股份有限公司 | Method for transmitting single-fiber QKD system synchronization signal |
| CN114389715A (en) * | 2020-12-31 | 2022-04-22 | 广东国腾量子科技有限公司 | Synchronous light detection and monitoring correction system for QKD |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106768320A (en) * | 2017-01-13 | 2017-05-31 | 中国科学技术大学 | Significantly gate single-photon detection system at a high speed |
| CN107024289A (en) * | 2017-04-13 | 2017-08-08 | 华中师范大学 | A kind of single-photon detector of low time jitter |
| WO2018196585A1 (en) * | 2017-04-24 | 2018-11-01 | 华为技术有限公司 | Signal receiving apparatus and receiving method |
| US10749608B2 (en) | 2017-04-24 | 2020-08-18 | Huawei Technologies Co., Ltd. | Signal receiving apparatus and method |
| CN107196758A (en) * | 2017-06-01 | 2017-09-22 | 浙江九州量子信息技术股份有限公司 | A kind of single photon detection method based on quantum key distribution |
| CN111385094A (en) * | 2018-12-28 | 2020-07-07 | 北京中创为量子通信技术有限公司 | High-speed quantum key generation system synchronization method and device |
| CN113541819A (en) * | 2020-12-30 | 2021-10-22 | 广东国腾量子科技有限公司 | Time synchronization system for quantum key distribution |
| CN113541819B (en) * | 2020-12-30 | 2023-12-19 | 广东国腾量子科技有限公司 | Time synchronization system for quantum key distribution |
| CN114389715A (en) * | 2020-12-31 | 2022-04-22 | 广东国腾量子科技有限公司 | Synchronous light detection and monitoring correction system for QKD |
| CN114389715B (en) * | 2020-12-31 | 2024-04-16 | 广东国腾量子科技有限公司 | Synchronous optical detection and monitoring correction system of QKD |
| CN114268421A (en) * | 2021-12-17 | 2022-04-01 | 安徽问天量子科技股份有限公司 | Method for transmitting single-fiber QKD system synchronization signal |
| CN114268421B (en) * | 2021-12-17 | 2024-04-19 | 安徽问天量子科技股份有限公司 | Method for transmitting synchronous signal of single-fiber QKD system |
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Address after: 230088 D3, Hefei Innovation Industrial Park, No. 800 Wangjiang West Road, hi tech Zone, Anhui, China Applicant after: QUANTUM COMMUNICATION TECHNOLOGY CO., LTD. Address before: 230088 D3, Hefei Innovation Industrial Park, No. 800 Wangjiang West Road, hi tech Zone, Anhui, China Applicant before: Anhui Liangzi Communication Technology Co., Ltd. |
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