CN208257815U - A kind of self difference balance detection device for quantum communication system - Google Patents
A kind of self difference balance detection device for quantum communication system Download PDFInfo
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- CN208257815U CN208257815U CN201820968998.8U CN201820968998U CN208257815U CN 208257815 U CN208257815 U CN 208257815U CN 201820968998 U CN201820968998 U CN 201820968998U CN 208257815 U CN208257815 U CN 208257815U
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Abstract
The utility model discloses a kind of self difference balance detection devices for quantum communication system, the self difference balance detection device includes light path control part and circuit control part, light path control part is by being converted into electric signal to carrying out being delayed between the two-way output light of interference unit being coupled to all the way and carrying out detection by a photodetector in circuit control part in optical path, and above electrical signal is beamed into two path signal, simultaneously by the electric delay process for carrying out identical delay all the way in two path signal, the time delay between time delay just compensating interferometer unit output light between this two path signal, finally realize the Fast-Balance detection of high accuracy.
Description
Technical field
The utility model relates to quantum key distribution technical field and field of cryptography, are more particularly to a kind of for quantum
The self difference balance detection device of communication system.
Background technique
Existing quantum random number scheme and continuous variable quantum key distribution receiving end scheme such as Fig. 1 based on vacuum fluctuation
Shown, detecting strategy is as follows:
Signal light 61 (Singal) and local oscillator light 62 (Local Oscillator) input interference unit 1 in, quantum with
Signal light 61 is usually vacuum state in machine number generator, and signal light 61 is modulation in continuous variable quantum key distribution receiving end
Pulse signal, the two-way light after interference is separately input to do balance detection, i.e., two in photodetector 2 and photodetector 3
It is defeated that the current difference of a photodetector output is changed into voltage signal after the amplification of trans-impedance amplifier 5 after the effect of subtracter 4
Out, interference unit 1 mostly uses 50:50 beam splitter.
The two-way light that balance detection method requires interference unit 1 to export first can reach photodetector 2 and light simultaneously
Electric explorer 3, and the fiber lengths of 1 output end of interference unit are easy to be influenced by environment temperature etc., therefore in the actual process
Needing to increase adjustable delay line in 1 output end of interference unit enables the two-beam same interference output light progress delay calibration
When reach photodetector 2 and photodetector 3, which substantially increases the complexities of system；
On the other hand, balance detection method require photodetector 2 and the response characteristic having the same of photodetector 3 and
Noise characteristic, but such case is irrealizable in the actual process, even if increasing adjustable light decay in 1 output end of interference unit
Subtract device to guarantee that the photoelectric current of 3 input terminal of photodetector 2 and photodetector is in the same size and also not can guarantee two photoelectricity spies
Frequency Response and the noise characteristic etc. for surveying device are consistent.
Utility model content
Being used for for a photodetector is only used the technical problem to be solved by the utility model is to provide a kind of
The self difference balance detection device of quantum communication system.
The utility model is to solve above-mentioned technical problem by following two technical solution:
One of technical solution:
A kind of self difference balance detection device for quantum communication system, described device includes light path control part and electricity
Road control section, light path control part output end connect the input terminal of circuit control part；
The light path control part includes incident light source, interference unit, light time-delay mechanism and beam splitter, the incident light source
Including signal light and local oscillator light, the incident light source connects interference unit, and the interference unit connects beam splitter, the light delay
Device is arranged between interference unit and beam splitter in any optical path；
The circuit control part includes photodetector, power splitter, electric delay device, subtracter and trans-impedance amplifier,
The beam splitter of photodetector connection light path control part, the power splitter connect photodetector, the electricity delay dress
It installs on any output circuit of power splitter, the subtracter input terminal connects electric delay device output end and power splitter simultaneously
Remaining output circuit, the trans-impedance amplifier connect subtracter.
Further, the signal light is the pulsed light or vacuum state of modulation, and the local oscillator light is pulsed light or continuous light.
Further, the interference unit is 50:50 beam splitter.
Further, the beam splitter is 50:50 beam splitter.
Further, the power splitter is 50:50 power splitter.
Further, the trans-impedance amplifier is 50:50 trans-impedance amplifier.
The two of technical solution:
A kind of self difference balance detection device for quantum communication system, described device includes light path control part and electricity
Road control section, light path control part output end connect the input terminal of circuit control part；
The light path control part includes incident light source, interference unit, light time-delay mechanism and beam splitter；Wherein incident light source
Including signal light and local oscillator light, the incident light source connects interference unit, and the interference unit connects beam splitter, the light delay
Device is arranged between interference unit and beam splitter in any optical path；
The circuit control part includes photodetector, trans-impedance amplifier, electric delay device and adder, the photoelectricity
Detector connects the beam splitter of light path control part, and the trans-impedance amplifier connects photodetector, and the electric delay device is set
Set on any output circuit of trans-impedance amplifier, the adder input terminal connect simultaneously trans-impedance amplifier residue output circuit and
Electric delay device output end.
Further, the signal light is the pulsed light or vacuum state of modulation, and the local oscillator light is pulsed light or continuous light.
Further, the interference unit is 50:50 beam splitter.
Further, the beam splitter is 50:50 beam splitter.
Further, the trans-impedance amplifier is 50:50 trans-impedance amplifier.
The utility model has the advantage that compared with prior art
Carry out self difference detection only with detector in the device of the utility model, thus avoid two detectors it
Between existing difference or since the brings inconsistency such as environmental factor causes the balance detection of system " imbalance " phenomenon occur,
Complicated feedback mechanism is also needed using usual in the scheme of two detectors, and the scheme of single detector is used to reduce this
Kind " imbalance " phenomenon is to adverse effect caused by system effectiveness and reliability etc..In addition, increased major part in this programme
It is the highly developed device of commercialization, bandwidth strong noise is small, is not necessarily to feedback mechanism, does not increase the complexity of system.
Detailed description of the invention
Fig. 1 is existing quantum random number scheme and continuous variable quantum key distribution receiving end scheme based on vacuum fluctuation
Schematic device；
Fig. 2 is the self difference balance detection schematic device of the utility model embodiment 1；
Fig. 3 be the utility model embodiment 1 self difference balance detection device in correspond to optical signal and electric signal timing diagram；
Fig. 4 is the self difference balance detection schematic device of the utility model embodiment 2；
Fig. 5 be the utility model embodiment 2 self difference balance detection device in correspond to optical signal and electric signal timing diagram.
Wherein: 1, interference unit；2, photodetector；3, photodetector；4, subtracter；5, trans-impedance amplifier；6, enter
Penetrate light source；61, signal light；62, local oscillator light；7, the first beam splitter；8, light time-delay mechanism；9, the second beam splitter；10, photodetection
Device；11,50:50 power splitter；12, electric delay device；13, subtracter；14,50:50 trans-impedance amplifier；15, adder.
Specific embodiment
It elaborates below to the embodiments of the present invention, the present embodiment before being with technical solutions of the utility model
It puts and is implemented, the detailed implementation method and specific operation process are given, but the protection scope of the utility model is unlimited
In following embodiments.
A kind of self difference balance detection device for quantum random number generator of embodiment 1
The structure of the self difference balance detection device of the present embodiment is as shown in Fig. 2, include light path control part and circuit control
Part processed, in which: light path control part is made of incident light source 6, the first beam splitter 7, light time-delay mechanism 8 and the second beam splitter 9；
The incident light source 6 includes signal light 61 and local oscillator light 62, and the signal light 61 is vacuum state, and the local oscillator light 62 is continuous
Light, incident light source 6 connect the first beam splitter 7, and signal light 61 and local oscillator light 62 are along respective optical link simultaneous transmission to the
In one beam splitter 7, first beam splitter 7 exports two-way interference light, two-way light point after interfering signal light 61 and local oscillator light 62
It is not transmitted along the upper lower arm of the first beam splitter 7, first beam splitter 7 connects the second beam splitter 9, the smooth time-delay mechanism 8
Be arranged on the upper arm of the first beam splitter 7, the smooth time-delay mechanism 8 be used for the optical signal that exports 7 upper arm of the first beam splitter into
Row light delay process, generates light pulse signal, and second beam splitter 9 is used for by light pulse signal and without the edge of delay process
It is exported after the another way optical signal coupling of first beam splitter, 7 lower arm transmission, wherein the first beam splitter 7 and the second beam splitter 9 are
50:50 beam splitter；
Circuit control part is by photodetector 10,50:50 power splitter 11, electric delay device 12, subtracter 13 and 50:50
Trans-impedance amplifier 14 forms, and the photodetector 10 connects the second beam splitter 9, when the pulse that the second beam splitter 9 is exported
Order-disorder transition is electric signal, and the 50:50 power splitter 11 connects photodetector 10, the electric signal that photodetector 10 is exported
It is divided into two path signal output, two path signal is transmitted along the upper lower arm of 50:50 power splitter 11 respectively, the electric delay device 12
It is arranged on the lower arm of 50:50 power splitter 11, electric delay process is carried out to the electric signal transmitted on lower arm, the subtracter 13 connects
Electric delay device 12 and 50:50 power splitter 11 are connect, while receiving the another way electric signal and electricity of the output of 11 upper arm of 50:50 power splitter
The delay electric signal that time-delay mechanism 12 exports, the 50:50 trans-impedance amplifier 14 connect subtracter 13, for subtracter 13 is defeated
Electric signal out amplifies and is changed into voltage signal output.
In the present embodiment, self difference balance detection device provided by the utility model is in quantum random number generator
Steps are as follows for detection method:
Signal light and local oscillator light are exported two-way interference light after the interference of the first beam splitter 7 by step 1, wherein doing all the way
Relate to optical signal by light be delayed t after formed delay optical signal, delay the optical signal of optical signal and another way without delay process into
Pulse sequence is exported after entering the coupling of the second beam splitter 9；
The pulse sequence that step 2, the second beam splitter 9 export enters in photodetector 10, converts through photodetector 10
At being input in 50:50 power splitter 11 after electric signal, two path signal is formed after the output of 50:50 power splitter 11, wherein one
Road electric signal inputs in subtracter 13 together with another way electric signal after electricity is delayed t, passes through again after the effect of subtracter 13
It crosses 50:50 trans-impedance amplifier 14 to amplify and be changed into voltage signal output, wherein light delay t is consistent with electricity delay t, two-way telecommunications
Time delay between number just compensates the time delay between 7 output light of the first beam splitter, completes balance detection.
It wherein corresponds to optical signal and electric signal timing diagram is as shown in Figure 3:
Fig. 3 (a) is the optical signal timing diagram of the second beam splitter 9 output, and pulse serial number 2 ', 1 ' respectively corresponds first in Fig. 2
About 7 two-arm of beam splitter exports pulse, and same 4 ', 3 ' respectively correspond after a system cycle T the first about 7 beam splitter in Fig. 2
Two-arm exports pulse；The time interval between time interval and pulse 4 ', 3 ' that pulse is 2 ', 1 ', that is, light delay t；Above-mentioned coupling
Light combination signal is input in 50:50 power splitter 11 after photodetector 10 is converted into electric signal.
Shown in 11 input terminal electric signal timing diagram such as Fig. 3 (b) of 50:50 power splitter, corresponding electric signal is 1 ", 2 ", 3 ",
4″；Above electrical signal forms two path signal after the output of 50:50 power splitter 11, wherein electric signal is by electricity delay t all the way
It is inputted together with another way electric signal in subtracter 13 afterwards.
Shown in electric signal timing diagram such as Fig. 3 (c) of 13 two-way input terminal of subtracter, 11 input terminal telecommunications of 50:50 power splitter
Number sequence 1 " being divided into 1 after 50:50 power splitter 11 " a and 1 " b two path signal, ", 3 ", 4 likewise, electrical signal sequence 2 "
It is respectively classified into 2 " a and 2 " b, 3 " a and 3 " b, 4 " a and 4 " b；Because light is delayed, t is consistent with electricity delay t, for subtracter
For 13,2 " a and 1 " b, 4 " a and 3 " b are corresponded in timing respectively, they are after the effect of subtracter 13 using 50:
50 trans-impedance amplifiers 14 amplify and are changed into voltage signal output.
A kind of self difference balance detection device for quantum random number generator of embodiment 2
The structure of the self difference balance detection device of the present embodiment is as shown in figure 4, include light path control part and circuit control
Part processed, in which: light path control part is made of incident light source 6, the first beam splitter 7, light time-delay mechanism 8 and the second beam splitter 9；
Wherein incident light source 6 includes signal light 61 and local oscillator light 62, and the signal light 61 is vacuum state, and the local oscillator light 62 is continuous
Light, the incident light source 6 connect the first beam splitter 7, the signal light 61 and local oscillator light 62 respectively along respective optical link simultaneously
Be transferred to the first beam splitter 7, first beam splitter 7 will signal light 61 and local oscillator light 62 interfere after be divided into two-way light output, two
Road light is transmitted along the upper lower arm of the first beam splitter 7 respectively, and first beam splitter 7 connects the second beam splitter 9, the light delay dress
8 are set to be arranged on the upper arm of the first beam splitter 7, by the light transmitted along 7 upper arm of the first beam splitter carry out delay process, described second
Beam splitter 9 by the delay optical signal that 7 upper arm of the first beam splitter exports and the first beam splitter 7 lower arm export without delay process
It is exported after optical signal coupling, wherein the first beam splitter 7 and the second beam splitter 9 are 50:50 beam splitter；
Circuit control part is by photodetector 10,50:50 trans-impedance amplifier 14, electric delay device 12 and 15 groups of adder
At the photodetector 10 connects the second beam splitter 9, and the coupling optical signal that the second beam splitter 9 exports is changed into telecommunications
Number, the 50:50 trans-impedance amplifier 14 connects photodetector 10, and the electric signal that photodetector 10 exports is divided into two-way
It is exported after voltage signal amplification, the electric delay device 12 is arranged in two-way voltage signal on the way, is used for the road
Voltage signal carries out electric delay process, and the adder 15 connects electric delay device 12 and 50:50 trans-impedance amplifier 14, simultaneously
Receive the another way voltage signal that 50:50 trans-impedance amplifier 14 exports and the delay voltage signal that electric delay device 12 exports, warp
It crosses after adder 15 acts on and is exported eventually as output signal.
In the present embodiment, steps are as follows for the detection method of self difference balance detection device provided by the utility model:
Signal light 61 and local oscillator light 62 are divided into two-way output by step 1 after the interference of the first beam splitter 7, wherein all the way
Optical signal is by light delay t processing, and the optical signal of optical signal and another way without delay process of delay process is through the second beam splitting
Device 9 exports after coupling；
In the coupling optical signal input photodetector 10 that step 2, the second beam splitter 9 export, through 10 turns of photodetector
It is input in 50:50 trans-impedance amplifier 14 after changing electric signal into, two-way voltage letter is exported after 50:50 trans-impedance amplifier 14
Number, and amplify respectively, any road voltage signal in amplified two-way voltage signal amplifies after electricity is delayed t with another way
Voltage signal afterwards enters together in adder 15, exports after the effect of adder 15 as output signal, due to light delay t
Consistent with electricity delay t, the time delay between two-way voltage signal just compensates the time delay between 7 output light of the first beam splitter, realizes flat
Weighing apparatus detection.
It wherein corresponds to optical signal and electric signal timing diagram is as shown in Figure 5:
Fig. 5 (a) is the optical signal timing diagram of the second beam splitter 9 output, and pulse serial number 2 ', 1 ' respectively corresponds first in Fig. 2
About 7 two-arm of beam splitter exports pulse, and same 4 ', 3 ' respectively correspond after a system cycle T the first about 7 beam splitter in Fig. 2
Two-arm exports pulse；The time interval between time interval and pulse 4 ', 3 ' that pulse is 2 ', 1 ', that is, light delay t；Above-mentioned coupling
Light combination signal is input in 50:50 trans-impedance amplifier 14 after photodetector 10 is converted into electric signal.
Shown in electric signal timing diagram such as Fig. 5 (b) of 14 input terminal of 50:50 trans-impedance amplifier, inputted through photodetector 10
It is 1 ", 2 ", 3 ", 4 " to the electric signal timing in 50:50 trans-impedance amplifier 14.
Above-mentioned 1 " electric signal is further divided into two path signal after amplifying respectively, respectively 1 " a and 1 " b, similarly, 2 ", 3 ", 4 " electricity
Signal is further divided into 2 " a and 2 " b, 3 " a and 3 " b, 4 " a and 4 " b after amplifying respectively；The two-way electricity that 50:50 trans-impedance amplifier 14 exports
Being input in adder 15 by electricity delay t and another way without the electric signal of delay process in signal all the way, adder 15
Shown in electric signal timing such as Fig. 5 (c) of input terminal, since light delay t is consistent with electricity delay t, for adder 15,
2 " a and 1 " b, 4 " a and 3 " b are corresponded in timing respectively, they are after the effect of adder 15 eventually as output signal
Output.
A kind of self difference balance detection device for CVQKD receiving terminal of communication system device of embodiment 3
With embodiment 1, difference is the self difference balance detection apparatus structure of the present embodiment, signal light 61 in the present embodiment
For the pulsed light of modulation, local oscillator light 62 is pulsed light.
A kind of self difference balance detection device for CVQKD receiving terminal of communication system device of embodiment 4
With embodiment 2, difference is the self difference balance detection apparatus structure of the present embodiment, signal light 61 in the present embodiment
For the pulsed light of modulation, local oscillator light 62 is pulsed light.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
Made any modifications, equivalent replacements, and improvements etc., should be included in the utility model within the spirit and principle of utility model
Protection scope within.
Claims (11)
1. a kind of self difference balance detection device for quantum communication system, which is characterized in that described device includes optical path control
System part and circuit control part, light path control part output end connect the input terminal of circuit control part；
The light path control part includes incident light source, interference unit, light time-delay mechanism and beam splitter, and the incident light source includes
Signal light and local oscillator light, the incident light source connect interference unit, and the interference unit connects beam splitter, the smooth time-delay mechanism
It is arranged between interference unit and beam splitter in any optical path；
The circuit control part includes photodetector, power splitter, electric delay device, subtracter and trans-impedance amplifier, described
Photodetector connects the beam splitter of light path control part, and the power splitter connects photodetector, and the electric delay device is set
It sets on any output circuit of power splitter, the subtracter input terminal connects electric delay device output end simultaneously and power splitter is remaining
Output circuit, the trans-impedance amplifier connect subtracter.
2. a kind of self difference balance detection device for quantum communication system according to claim 1, which is characterized in that
The signal light is the pulsed light or vacuum state of modulation, and the local oscillator light is pulsed light or continuous light.
3. a kind of self difference balance detection device for quantum communication system according to claim 1, which is characterized in that
The interference unit is 50:50 beam splitter.
4. a kind of self difference balance detection device for quantum communication system according to claim 1, which is characterized in that
The beam splitter is 50:50 beam splitter.
5. a kind of self difference balance detection device for quantum communication system according to claim 1, which is characterized in that
The power splitter is 50:50 power splitter.
6. a kind of self difference balance detection device for quantum communication system according to claim 1, which is characterized in that
The trans-impedance amplifier is 50:50 trans-impedance amplifier.
7. a kind of self difference balance detection device for quantum communication system, which is characterized in that described device includes optical path control
System part and circuit control part, light path control part output end connect the input terminal of circuit control part；
The light path control part includes incident light source, interference unit, light time-delay mechanism and beam splitter；Wherein incident light source includes
Signal light and local oscillator light, the incident light source connect interference unit, and the interference unit connects beam splitter, the smooth time-delay mechanism
It is arranged between interference unit and beam splitter in any optical path；
The circuit control part includes photodetector, trans-impedance amplifier, electric delay device and adder, the photodetection
Device connects the beam splitter of light path control part, and the trans-impedance amplifier connects photodetector, and the electric delay device setting exists
On any output circuit of trans-impedance amplifier, the adder input terminal connects trans-impedance amplifier residue output circuit simultaneously and electricity prolongs
When device output end.
8. a kind of self difference balance detection device for quantum communication system according to claim 7, which is characterized in that
The signal light is the pulsed light or vacuum state of modulation, and the local oscillator light is pulsed light or continuous light.
9. a kind of self difference balance detection device for quantum communication system according to claim 7, which is characterized in that
The interference unit is 50:50 beam splitter.
10. a kind of self difference balance detection device for quantum communication system according to claim 7, feature exist
In the beam splitter is 50:50 beam splitter.
11. a kind of self difference balance detection device for quantum communication system according to claim 7, feature exist
In the trans-impedance amplifier is 50:50 trans-impedance amplifier.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110572218A (en) * | 2019-07-23 | 2019-12-13 | 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所） | Single photon detection system based on time division multiplexing |
| CN110635850A (en) * | 2018-06-22 | 2019-12-31 | 科大国盾量子技术股份有限公司 | Self-differential balance detection device and detection method for quantum communication system |
| CN112857564A (en) * | 2019-11-28 | 2021-05-28 | 余姚舜宇智能光学技术有限公司 | Photoelectric detector circuit system and photoelectric detection method |
-
2018
- 2018-06-22 CN CN201820968998.8U patent/CN208257815U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110635850A (en) * | 2018-06-22 | 2019-12-31 | 科大国盾量子技术股份有限公司 | Self-differential balance detection device and detection method for quantum communication system |
| CN110635850B (en) * | 2018-06-22 | 2022-12-27 | 科大国盾量子技术股份有限公司 | Self-differential balance detection device and detection method for quantum communication system |
| CN110572218A (en) * | 2019-07-23 | 2019-12-13 | 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所） | Single photon detection system based on time division multiplexing |
| CN110572218B (en) * | 2019-07-23 | 2021-01-12 | 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所） | Single photon detection system based on time division multiplexing |
| CN112857564A (en) * | 2019-11-28 | 2021-05-28 | 余姚舜宇智能光学技术有限公司 | Photoelectric detector circuit system and photoelectric detection method |
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