CN203812427U - An eavesdropping demonstration apparatus based on quantum key communication - Google Patents
An eavesdropping demonstration apparatus based on quantum key communication Download PDFInfo
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- CN203812427U CN203812427U CN201420084395.3U CN201420084395U CN203812427U CN 203812427 U CN203812427 U CN 203812427U CN 201420084395 U CN201420084395 U CN 201420084395U CN 203812427 U CN203812427 U CN 203812427U
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Abstract
The utility model discloses an eavesdropping demonstration apparatus based on quantum key communication. The eavesdropping demonstration apparatus based on the quantum key communication comprises an optical switch OS, a first light beam splitter BS1, a second light beam splitter BS2 and a detector module. The optical switch OS comprises a light input terminal, a first light output terminal and a second light output terminal. The first light beam splitter BS1 comprises a first light inlet terminal, a second light inlet terminal and a light output terminal. The second light beam splitter BS2 comprises a light inlet, a first light outlet and a second light outlet. The first light output terminal is in connection with the first light inlet terminal. The second light output terminal is in connection with the light inlet. The first light outlet is in connection with the second light inlet terminal. The second light outlet is in connection with the detector module. According to the eavesdropping demonstration apparatus based on the quantum key communication of the utility model, through the cooperation of the first light beam splitter and the second light beam splitter, through the simulation of eavesdropping behaviors by the detector module, the security of information transmitted through the quantum communication can be visually displayed; and the method is simple, visual, economically efficient and practical.
Description
Technical field
The present invention relates to a kind of eavesdropping demonstration equipment for quantum key communication process, relate in particular to a kind of eavesdropping apparatus for demonstrating based on quantum key communication.
Background technology
Quantum key communication, the three large laws of learning based on quantum: measure collapse theory, quantum No-clone theorem and uncertainty principle.Based on above three broad theories, security and the reliability of quantum key communication transmission information are better than classical communication mode.But in prior art, generally can not demonstrate intuitively the security of quantum communications, also cannot demonstrate intuitively the process of eavesdropping.
Summary of the invention
Technical matters solved by the invention is for above-mentioned the deficiencies in the prior art, a kind of eavesdropping apparatus for demonstrating based on quantum key communication is provided, this eavesdropping apparatus for demonstrating based on quantum key communication can be illustrated in the eavesdropping behavior of the listener-in in quantum key communication process intuitively, the knowwhy of microcosmic is presented in face of people on a macro scale, is convenient to understand better the security of quantum communications.
For realizing above-mentioned technical purpose, the technical scheme that the present invention takes is: based on the eavesdropping apparatus for demonstrating of quantum key communication, it is characterized in that: comprise for the photoswitch OS of switching working mode, for light being closed to road or the first beam splitter BS1 along separate routes, for light being closed to road or the second beam splitter BS2 along separate routes, eavesdrop the synchroprobe of information for simulating listener-in; Described photoswitch OS comprises light input end, the first light output end and the second light output end; Described the first beam splitter BS1 comprises the first light inlet, the second light inlet and light output end; Described the second beam splitter BS2 comprises light inlet, the first light-emitting window and the second light-emitting window; Described the first light output end is connected with the first light inlet, and the second light output end is connected with light inlet, and the first light-emitting window is connected with the second light inlet, and the second light-emitting window is connected with synchroprobe;
Light beam enters after light input end, penetrates or penetrates from the second light output end from the first light output end; In the time that light beam penetrates from the first light output end, after the first beam splitter BS1, penetrate and be transferred to receiving end from light output end again; In the time that light beam penetrates from the second output terminal, be divided into two-beam through the second beam splitter BS2 again, wherein light beam penetrates and is transferred to receiving end from light output end after the first beam splitter BS1, and another light beam enters synchroprobe.
As further improved technical scheme of the present invention, the photoswitch that described photoswitch OS is self-locking mechanical.
As further improved technical scheme of the present invention, described the first beam splitter BS1 and the second beam splitter BS2 are the beam splitter of 50:50.
As further improved technical scheme of the present invention, also comprise the pilot lamp being connected with synchroprobe point, in the time that synchroprobe intercepts information, pilot lamp is bright.
The principle of work of this eavesdropping apparatus for demonstrating based on quantum key communication is as follows:
1. normal mode: light beam is accessed from light input end, single-pole double-throw switch (SPDT) is pushed to normal mode gear simultaneously, this time transmits through the first beam splitter BS1 along normal mode link through photoswitch OS, and then passes to light output end.During this period, because the selection effect of photoswitch OS, eavesdropping mode link does not have light beam process, and synchroprobe can not detect any useful information, and pilot lamp can not glimmer.
2. eavesdropping pattern: light beam is standby from light input end access, single-pole double-throw switch (SPDT) is pushed to normal mode gear simultaneously, now light beam is divided into two paths of signals along eavesdropping mode link through the second beam splitter BS2 transmission through photoswitch OS, one tunnel the first beam splitter BS1 passes to light output end, and synchroprobe is passed on another road.Synchroprobe detects useful information, is equivalent to eavesdrop successfully, and now pilot lamp flicker, intuitively shows that eavesdropping process carries out.During this period, because the selection effect of photoswitch, normal mode link does not have light process.
The security that the three large philosophys that quantum is learned are quantum communications is laid a good foundation.When information is in the process of transmission, because having determined information, the nonclonability of quantum cannot be replicated, in order to eavesdrop, listener-in can only be by repeatedly measuring obtaining information, can know repeatedly to measure and will inevitably cause initial quantum state to change by the measurement theory of collapsing, thereby confirm listener-in's existence.The present invention intuitively shows quantum communications security.
Normal mode: in optical fiber communication process, decay on circuit is probably 0.2dB/Km, the in the situation that of normal transmission, the light of carry information is selected along normal mode link transmission through photoswitch, and then through being equivalent to the first beam splitter BS1 transmission of 3dB attenuator, then arrives receiving end, show that at the receiving end of QKD size of key is normal, the bit error rate is in safe range, and the pad value of whole link is probably 3.4dB, is equivalent to 17Km optical fiber.
Eavesdropping pattern: in the time wanting to simulate listener-in's eavesdropping behavior, as long as manually photoswitch is switched to eavesdropping pattern, at this time information will be through the transmission of eavesdropping mode link, after the second beam splitter BS2, be divided into two paths of signals, wherein a road enters synchroprobe, the device of the information namely intercepting for the listener-in who simulates, another Lu Zaijing first beam splitter BS1 is transferred to receiving end.In the time that listener-in intercepts information, synchroprobe one end is provided with one for eavesdropping the warning light of information indicating, and its flicker frequency is relevant with the light pulse of link.Meanwhile, because the decay of whole piece link is probably 6.7dB, can show that at QKD receiving end size of key reduces, the bit error rate raises, thereby QKD equipment can be reported to the police, be used for showing that transmission link information is eavesdropped, and then information sender gives up the information having transmitted, intuitively shown the security of quantum communications equipment.
The present invention, by the cooperation of the first beam splitter and the second beam splitter, simulates eavesdropping behavior by synchroprobe, can show very intuitively the security of quantum communications transmission information, and method simple, intuitive is economical and practical.
Brief description of the drawings
Fig. 1 is electrical block diagram of the present invention.
Fig. 2 is object construction schematic diagram of the present invention.
Embodiment
embodiment 1
Referring to Fig. 1, this eavesdropping apparatus for demonstrating based on quantum key communication, comprises for the photoswitch OS of switching working mode, for light being closed to road or the first beam splitter BS1 along separate routes, for light being closed to road or the second beam splitter BS2 along separate routes, eavesdrops the synchroprobe of information for simulating listener-in; Described photoswitch OS comprises light input end 1, the first light output end 2 and the second light output end 3; Described the first beam splitter BS1 comprises the first light inlet 4, the second light inlet 5 and light output end 6; Described the second beam splitter BS2 comprises light inlet 7, the first light-emitting window 8 and the second light-emitting window 9; Described the first light output end 2 is connected with the first light inlet 4, and the second light output end 3 is connected with light inlet 7, and the first light-emitting window 8 is connected with the second light inlet 5, and the second light-emitting window 9 is connected with synchroprobe; Light beam enters after light input end 1, penetrates or penetrates from the second light output end 3 from the first light output end 2; In the time that light beam penetrates from the first light output end 2, after the first beam splitter BS1, penetrate and be transferred to receiving end from light output end 6 again; In the time that light beam penetrates from the second output terminal 3, be divided into two-beam through the second beam splitter BS2 again, wherein light beam penetrates and is transferred to receiving end from light output end 6 after the first beam splitter BS1, and another light beam enters synchroprobe.
In the present embodiment, described photoswitch OS is self-locking mechanical photoswitch; Described the first beam splitter BS1 and the second beam splitter BS2 are the beam splitter of 50:50; Also comprise the pilot lamp being connected with synchroprobe point, in the time that synchroprobe intercepts information, pilot lamp is bright.
In the present embodiment, also comprise for the power knob to whole system power supply; Described photoswitch is that the mechanical type light of self-locking opens the light, for switching working mode, i.e. and normal mode or eavesdropping pattern, the present embodiment adopts ship type single-pole double-throw switch (SPDT), opens the light for controlling light, manually selects mode of operation.The first beam splitter BS1 and the second beam splitter BS2 are used for light to close road or shunt, and are the beam splitter of 50:50, are equivalent to 3dB attenuator; Synchroprobe is used for simulating listener-in and eavesdrops information; Pilot lamp is used to indicate synchroprobe and whether intercepts information.This eavesdropping apparatus for demonstrating based on quantum key communication can simulated strike person eavesdropping behavior, for the feature of communication, intuitively show the process that quantum key communication is eavesdropped, thereby objectively respond out the security of quantum communications.
The present embodiment, in the time of actual fabrication, referring to Fig. 2, is followed successively by panel from left to right: power knob, for the single-pole double-throw switch (SPDT) of the ring flange interface of light signal input and output, eavesdropping pilot lamp and ship type.First, get a 1U cabinet, open five sizeable holes at its front panel, be respectively used to ring flange, pilot lamp and the ship type single-pole double-throw switch (SPDT) of fixed power source button, optical fiber input and output, after it, open a sizeable hole, for fixed power source interface.
The second, D.C. regulated power supply is fixed on 1U chassis base, and near back side power interface, after fixedly completing, power interface is connected with wire with power module, be convenient to whole equipment power supply.
The 3rd, open the light OS, the first beam splitter BS1 and the second beam splitter BS2 of light is fixed on to cabinet bottom, and coiled tail optical fiber, each optical fiber interface is connected.
The 4th, synchroprobe is fixed on to cabinet bottom, and power taking from power module, at this, we adopt synchroprobe, for surveying the light of 1550nm wave band.
The 5th, the operating voltage that mechanical type light opens the light is 5 ± 0.5V, so draw a 5V power lead to single-pole double-throw switch (SPDT) from power supply, is switched light is opened the light and powered on by the state of single-pole double-throw switch (SPDT), thereby reach the object of selecting different links.
The 6th, after power knob is pressed, device power, just can handle interior lights switch by stirring single-pole double-throw switch (SPDT), thereby switches normal or eavesdropping mode state.Whether flicker by the pilot lamp on equipment, just can show listener-in's eavesdropping behavior, and pilot lamp flicker representative eavesdropping is carried out, and the pilot lamp representative information that do not work transmits along normal mode link safety.
Claims (4)
1. the eavesdropping apparatus for demonstrating based on quantum key communication, is characterized in that: comprise for the photoswitch OS of switching working mode, for light being closed to road or the first beam splitter BS1 along separate routes, for light being closed to road or the second beam splitter BS2 along separate routes, eavesdrop the synchroprobe of information for simulating listener-in; Described photoswitch OS comprises light input end (1), the first light output end (2) and the second light output end (3); Described the first beam splitter BS1 comprises the first light inlet (4), the second light inlet (5) and light output end (6); Described the second beam splitter BS2 comprises light inlet (7), the first light-emitting window (8) and the second light-emitting window (9); Described the first light output end (2) is connected with the first light inlet (4), and the second light output end (3) is connected with light inlet (7), and the first light-emitting window (8) is connected with the second light inlet (5), and the second light-emitting window (9) is connected with synchroprobe;
Light beam enters after light input end (1), penetrates or penetrates from the second light output end (3) from the first light output end (2); In the time that light beam penetrates from the first light output end (2), after the first beam splitter BS1, penetrate and be transferred to receiving end from light output end (6) again; In the time that light beam penetrates from the second output terminal (3), be divided into two-beam through the second beam splitter BS2 again, wherein light beam penetrates and is transferred to receiving end from light output end (6) after the first beam splitter BS1, and another light beam enters synchroprobe.
2. the eavesdropping apparatus for demonstrating based on quantum key communication according to claim 1, is characterized in that: the photoswitch that described photoswitch OS is self-locking mechanical.
3. the eavesdropping apparatus for demonstrating based on quantum key communication according to claim 2, is characterized in that: described the first beam splitter BS1 and the second beam splitter BS2 are the beam splitter of 50:50.
4. according to the eavesdropping apparatus for demonstrating based on quantum key communication described in claim 1 or 2 or 3, it is characterized in that: also comprise the pilot lamp being connected with synchroprobe point, in the time that synchroprobe intercepts information, pilot lamp is bright.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420084395.3U CN203812427U (en) | 2014-02-27 | 2014-02-27 | An eavesdropping demonstration apparatus based on quantum key communication |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420084395.3U CN203812427U (en) | 2014-02-27 | 2014-02-27 | An eavesdropping demonstration apparatus based on quantum key communication |
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| CN203812427U true CN203812427U (en) | 2014-09-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420084395.3U Withdrawn - After Issue CN203812427U (en) | 2014-02-27 | 2014-02-27 | An eavesdropping demonstration apparatus based on quantum key communication |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103824487A (en) * | 2014-02-27 | 2014-05-28 | 安徽问天量子科技股份有限公司 | Wiretap demonstration device and method based on quantum key communication |
-
2014
- 2014-02-27 CN CN201420084395.3U patent/CN203812427U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103824487A (en) * | 2014-02-27 | 2014-05-28 | 安徽问天量子科技股份有限公司 | Wiretap demonstration device and method based on quantum key communication |
| CN103824487B (en) * | 2014-02-27 | 2016-01-13 | 安徽问天量子科技股份有限公司 | Based on eavesdropping apparatus for demonstrating and the method thereof of quantum key communication |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140903 Effective date of abandoning: 20160113 |
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| C25 | Abandonment of patent right or utility model to avoid double patenting |