CN203251311U - Quantum state modulation device for decoy quantum key distribution system - Google Patents
Quantum state modulation device for decoy quantum key distribution system Download PDFInfo
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- CN203251311U CN203251311U CN 201320160626 CN201320160626U CN203251311U CN 203251311 U CN203251311 U CN 203251311U CN 201320160626 CN201320160626 CN 201320160626 CN 201320160626 U CN201320160626 U CN 201320160626U CN 203251311 U CN203251311 U CN 203251311U
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Abstract
The utility model discloses a quantum state modulation device for a decoy quantum key distribution system; the device comprises a main control module FPGA, a 1550nm laser driving module and a system optical module; the system optical module comprises a voltage control common light intensity modulator EVOA, a F-M optical interference ring and a light circulator; one output path of the main control module FPGA is electrically connected with the voltage control common light intensity modulator EVOA; an output of the voltage control common light intensity modulator EVOA is electrically connected with F-M optical interference ring; an output terminal of the 1550nm laser driving circuit is electrically connected with the light circulator; one output path of the light circulator is electrically connected with the voltage control common light intensity modulator EVOA; and the other output path of the light circulator is used for outputting modulated quantum signals. The quantum state modulation device for the decoy quantum key distribution system can stably and reliably modulate photons in signal state, decoy state and vacuum state, and can greatly reduce cost.
Description
Technical field
The utility model relates to a kind of quantum state modulating device for inveigling attitude (Decoy) quantum key dispatching system, relates in particular to a kind of quantum state modulating device for inveigling the attitude quantum key dispatching system.
Background technology
Fail safe is one of most important content in the quantum cryptography research field, and for the quantum key dispatching system QKD in current employing weak coherent light source, no matter how many average intensities with light source decays to, and all can have therein certain probability to contain the multi-photon pulse.The threat of actual QKD system maximum comes from beam-splitting attack PNS, and listener-in Eve can measure the contained number of photons of pulse that transmitting terminal Alice sends by quantum Nondestructive measurement technology QND, and does not change its quantum state.Eve just can carry out beam splitting with multi-photon simultaneously with the single photon signal shielding like this, keeps one of them photon, and all the other photons are sent to receiving terminal Bob by lossless channel.Therefore Eve can successfully utilize PNS to obtain certain information.PNS has greatly limited transmission range and the key production rate of communicating pair QKD under non-ideal condition.The Decoy agreement has thoroughly solved under real system and the prior art condition safe speed to be increased and the problem of degradation with distance.The ternary agreement of Decoy attitude, i.e. signal attitude, decoy attitude and vacuum state realize by the modulating light pulse amplitude, in current Decoy quantum key dispatching system all are to adopt high speed light intensity modulator IM to realize the modulation of three kinds of states of quantum.Traditional Decoy agreement QKD system block diagram based on IM modulation quantum state as shown in Figure 1, adopt light intensity modulator IM to come three kinds of states of modulation voltage subsignal, it is the signal attitude, inveigle attitude and vacuum state, the difference of these three kinds of signal conditions only is the pad value difference that IM offers fiber channel, quantum signal is in respectively three kinds of different states under three kinds of different decay, wherein vacuum state is not a kind of state that does not definitely have light, level off to the extremely weak Decoy attitude of vacuum state because in reality, can only obtain light intensity, in theory was analyzed, people still habitually were referred to as " vacuum state ".But; IM is very responsive to polarization variations and since light when in optical fiber, propagating its polarization state be very significant with environmental evolution, so the error rate of QKD system of using IM is with weather or variations in temperature also highly significant; this can cause the error rate too high usually, and system can't proper communication.
The utility model content
The purpose of this utility model is to provide a kind of quantum state modulating device band for inveigling the attitude quantum key dispatching system, what this be used for to inveigle that quantum state modulating device of attitude quantum key dispatching system can be reliable and stable is signal attitude, decoy attitude and vacuum state with photonic modulation, and has reduced widely cost.
For realizing above-mentioned technical purpose, the technical scheme that the utility model is taked is: be used for inveigling the quantum state modulating device of attitude quantum key dispatching system, comprise main control module FPGA, 1550nm laser driver module and system optics module; It is characterized in that: the two-way output of described main control module FPGA is electrically connected with main control module FPGA and system optics module respectively; The output of described 1550nm drive circuit for laser is electrically connected with the system optics module; Described system optics module is used for exporting modulated quantum signal; Described system optics module comprises the common light intensity modulator EVOA of voltage control, F-M optical interference ring and optical circulator; The road output of main control module FPGA is electrically connected with the common light intensity modulator EVOA of voltage control, and the output of the common light intensity modulator EVOA of voltage control is electrically connected with F-M optical interference ring; The output of 1550nm drive circuit for laser and optical circulator, one tunnel output of optical circulator is electrically connected with the common light intensity modulator EVOA of voltage control, and another road is used for exporting modulated quantum signal.
The utility model compared with prior art, removed IM intensity modulation part, it is identical with original system that other parts keep substantially, only depends on the two-way pin output that increases FPGA directly to control the light intensity relevant control pin of laser driving chip, thereby realize the control to output intensity; Advantage has: 1, directly solved the control of Laser output light intensity on circuit, avoided the relevant impact of IM device polarization in the real system, so that the error rate of system can be stablized for a long time; Reduce system complexity, and greatly reduced cost, saved the optics IM of units up to ten thousand.In a word, the utility model energy is reliable and stable must to be signal attitude, decoy attitude and vacuum state with photonic modulation, and has reduced widely cost.
Description of drawings
Fig. 1 is structural representation of the prior art.
Fig. 2 is circuit structure block diagram of the present utility model.
Fig. 3 is electrical block diagram of the present utility model.
Below in conjunction with accompanying drawing embodiment of the present utility model is described further.
Embodiment
Embodiment 1
Referring to Fig. 2 and Fig. 3, the quantum state modulating device that this is used for inveigling the attitude quantum key dispatching system comprises main control module FPGA, 1550nm laser driver module and system optics module; It is characterized in that: the two-way output of described main control module FPGA is electrically connected with main control module FPGA and system optics module respectively; The output of described 1550nm drive circuit for laser is electrically connected with the system optics module; Described system optics module is used for exporting modulated quantum signal; Described system optics module comprises the common light intensity modulator EVOA of voltage control, F-M optical interference ring and optical circulator; The road output of main control module FPGA is electrically connected with the common light intensity modulator EVOA of voltage control, and the output of the common light intensity modulator EVOA of voltage control is electrically connected with F-M optical interference ring; The output of 1550nm drive circuit for laser and optical circulator, one tunnel output of optical circulator is electrically connected with the common light intensity modulator EVOA of voltage control, and another road is used for exporting modulated quantum signal.
As shown in Figure 3, this is used for inveigling the quantum state modulating device of attitude quantum key dispatching system substantially to keep identical with original circuit, the enable pin QLD_EN and the output intensity that have only increased laser driving chip arrange pin QLD_INTENSITY, the former can enable control to Laser output, and the latter can be made as output intensity certain fixed value.Three kinds of quantum states of Decoy agreement were Stochastic Modulation when this quantum state modulating device that is used for trick attitude quantum key dispatching system was communicated by letter, transmitting terminal is in transmitted signal attitude light, enable the QLD_EN pin and the QLD_INTENSITY pin is in high-impedance state, at this moment the laser of laser output signal attitude light intensity; When sending trick attitude light, enable the QLD_EN pin and QLD_INTENSITY pin output fixed level is set, so that laser is exported the laser of set trick attitude light intensity; When sending vacuum state light, it is the disable state that the QLD_EN pin is set, and at this moment laser does not have light output, and at this moment output intensity reaches vacuum state.
Claims (1)
1. a quantum state modulating device that is used for inveigling the attitude quantum key dispatching system comprises main control module FPGA, 1550nm laser driver module and system optics module; It is characterized in that: the two-way output of described main control module FPGA is electrically connected with main control module FPGA and system optics module respectively; The output of described 1550nm drive circuit for laser is electrically connected with the system optics module; Described system optics module is used for exporting modulated quantum signal; Described system optics module comprises the common light intensity modulator EVOA of voltage control, F-M optical interference ring and optical circulator; The road output of main control module FPGA is electrically connected with the common light intensity modulator EVOA of voltage control, and the output of the common light intensity modulator EVOA of voltage control is electrically connected with F-M optical interference ring; The output of 1550nm drive circuit for laser and optical circulator, one tunnel output of optical circulator is electrically connected with the common light intensity modulator EVOA of voltage control, and another road is used for exporting modulated quantum signal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201320160626 CN203251311U (en) | 2013-04-03 | 2013-04-03 | Quantum state modulation device for decoy quantum key distribution system |
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| CN 201320160626 CN203251311U (en) | 2013-04-03 | 2013-04-03 | Quantum state modulation device for decoy quantum key distribution system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103618598A (en) * | 2013-12-13 | 2014-03-05 | 上海朗研光电科技有限公司 | Method and device for preparing high-speed polarization encoded decoy state quantum light source |
| CN104104502A (en) * | 2014-07-24 | 2014-10-15 | 安徽问天量子科技股份有限公司 | Quantum-state light intensity locking method and device of quantum key distribution system |
| CN104506308A (en) * | 2014-12-23 | 2015-04-08 | 上海朗研光电科技有限公司 | Method and device for manufacturing external modulation high-speed decoy-state quantum light sources |
| CN104579638A (en) * | 2014-09-30 | 2015-04-29 | 清华大学 | Decoy-state quantum key distribution system based on discrete random phase |
| CN110620617A (en) * | 2018-12-27 | 2019-12-27 | 科大国盾量子技术股份有限公司 | Driving device for DFB laser in quantum key distribution |
| CN111857207A (en) * | 2019-04-25 | 2020-10-30 | 科大国盾量子技术股份有限公司 | Voltage feedback method of quantum key distribution intensity modulator |
-
2013
- 2013-04-03 CN CN 201320160626 patent/CN203251311U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103618598A (en) * | 2013-12-13 | 2014-03-05 | 上海朗研光电科技有限公司 | Method and device for preparing high-speed polarization encoded decoy state quantum light source |
| CN103618598B (en) * | 2013-12-13 | 2016-09-07 | 上海朗研光电科技有限公司 | The trick state quantum light source preparation method of high speed polarization encoder and device |
| CN104104502A (en) * | 2014-07-24 | 2014-10-15 | 安徽问天量子科技股份有限公司 | Quantum-state light intensity locking method and device of quantum key distribution system |
| CN104579638A (en) * | 2014-09-30 | 2015-04-29 | 清华大学 | Decoy-state quantum key distribution system based on discrete random phase |
| CN104506308A (en) * | 2014-12-23 | 2015-04-08 | 上海朗研光电科技有限公司 | Method and device for manufacturing external modulation high-speed decoy-state quantum light sources |
| CN110620617A (en) * | 2018-12-27 | 2019-12-27 | 科大国盾量子技术股份有限公司 | Driving device for DFB laser in quantum key distribution |
| CN111857207A (en) * | 2019-04-25 | 2020-10-30 | 科大国盾量子技术股份有限公司 | Voltage feedback method of quantum key distribution intensity modulator |
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Address after: 241003 No. 12, Zhanghe Road, hi tech Zone, Anhui, Wuhu Patentee after: ANHUI ASKY QUANTUM TECHNOLOGY Co.,Ltd. Address before: 241002 Anhui science and technology innovation public service center, Wuhu national hi tech Zone, Yijiang Patentee before: ANHUI ASKY QUANTUM TECHNOLOGY Co.,Ltd. |
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Granted publication date: 20131023 |
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