CN208386565U - A kind of improved HD-QKD system and receiving end - Google Patents
A kind of improved HD-QKD system and receiving end Download PDFInfo
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Abstract
The utility model discloses a kind of improved HD-QKD system and receiving ends, HD-QKD system includes the transmitting terminal to match and receiving end, the transmitting terminal is injected based on light and the mode of internal modulation carries out basic vector modulation to light pulse and trick state modulates light pulse group after being encoded, then receiving end is sent to after decaying；The receiving end by after the coding of transmitting terminal light pulse group be split after be utilized respectively Z basic vector detecting module and X basic vector detecting module detects；Wherein the X basic vector detecting module includes that the intervention module with faraday rotation mirror and single-photon detector corresponding with optical pulse code dimension, each single-photon detector separately detect corresponding result of interference.The utility model solves the problems, such as to polarize drifting problem existing for phase randomization and existing apparatus between pulse group in existing apparatus.
Description
Technical field
The utility model relates to Technique on Quantum Communication field more particularly to a kind of higher-dimension quantum key distribution systems.
Background technique
Quantum key distribution system (QKD) may be implemented remote both sides or share peace by unsafe channel in many ways
Full key.And the device that QKD system uses is existing universal optical device substantially, and transmission line can be used existing
Optical fiber or directly by vacuum carry out, without any special device and transmission line make its quickly move towards functionization.Meanwhile
The appearance of quantum computer will bring enormous impact to existing Public Key Infrastructure, will be no longer safe.And it is used based on QKD system
The encryption system of one-time pad is unconditional security, is hopeful solution Communication Security Problem once and for all.Therefore QKD research
With very great practical value.
Conventional QKD system carries out in such a way that a bit information encodes a quantum state, in order to further enhance
Cipher key delivery rate, higher-dimension quantum key distribution system (HD-QKD) are suggested.In HD-QKD, a quantum state will carry more
The information of a bit, to promote the rate of key distribution.
In higher-dimension coded system, X basic vector and Z basic vector have d eigenstate (d indicates system dimensions), therefore each
Sign state corresponds to 0 bit value for arriving d-1.X basic vector eigenstate and the eigenstate of corresponding Z basic vector can be described with following formula
Wherein | fn> and | tm> it is respectively X basic vector n-th and m-th of eigenstate of Z basic vector.
The form of existing higher-dimension coding is also varied, and the scheme of mainstream is time encoding；Its experiment realize on more
Simply, it thus is widely studied.
In higher-dimension time encoding, the quantum state of d dimension needs the continuous same time interval (τ) corresponding d to constitute
One period (T=d τ) indicates.For time interval, it is marked with 0 to d-1 from left to right.For Z basic vector, times
Anticipate an eigenstate | tn> the concrete form in time encoding are as follows: only have pulse in n-th of time interval and remaining time
There is no pulse in interval.For X basic vector, be not difficult to learn according to formula (1), between different basic vectors the difference is that in time interval
The phase of pulse, and the probability for occurring pulse in each interval is identical.When Fig. 1 gives d=4, | t0> and | f0> time encoding
Form, and for | f0> phase of pulse in each of which interval is labelled with according to above-mentioned formula.
Easy steps such as Fig. 2 of existing higher-dimension time encoding QKD, this is sentenced for dimension d=4:
The laser at the end Alice generates a series of laser pulse of constant durations；
Pulse is after the first intensity modulator (IM1) modulation controlled by FPGA, with the probability of P and 1-P respectively to arteries and veins
The modulation of punching group progress X basic vector and Z basic vector；The object of modulation is the pulse group that 4 continuous impulses are constituted；For Z basic vector, pulse
For group by one of equal probabilities Stochastic Modulation to 4 eigenstates, specific implementation is will be in corresponding three time intervals by IM1
Pulse strength be modulated to 0；For needing to carry out the pulse group of X basic vector modulation, IM1 is not modulated.
Pulse train enters phase-modulator (PM) and carries out phase-modulation；PM completes X base by adjusting the phase of pulse
Swear the modulation of eigenstate, and the probability for being modulated to any one eigenstate is identical；For the pulse by the modulation of above-mentioned Z basic vector
Group, PM is without modulation.
Then by the second intensity modulator (IM2) of FPGA control according to probability Stochastic Modulation pulse group intensity to several choosings
Definite value, which, which is referred to as, inveigles state modulation.
The intensity of each pulse group is further then decayed into single photon level by the attenuator (ATT) of FPGA control；
Alice completes the preparation of quantum state, it is sent to Bob by optical fiber.
The end Bob first by incident pulse group be sent into a non-equilibrium beam splitter (BS), transmission and reflectivity be (1-P)/
P；The pulse group of transmissive portion enters Z basic vector detecting module, and the pulse group of reflective portion enters X basic vector detecting module.
Z basic vector detecting module only needs a photodetector D1, have in which time interval by detector response come
Incident quantum state is judged, so that it is determined that bit value.
X basic vector detecting module (referring to Fig. 3): it is made of three time delay interferometers and four photodetectors；First dry
Interferometer constitutes (BS1 and BS2) by delay line 1 (fiber delay line) and two beam splitters；Second interferometer is by delay line 2 and two
A beam splitter constitutes (BS3 and BS4)；Third interferometer is made of delay line 3, phase-modulator (PM) and two beam splitters
(BS5 and BS6) is constituted；The measurement result of X basic vector depends on response of 4 detectors in the 3rd time interval, some detector Xi
(the X in figure0~X4) there is counting in the time interval, then show that the quantum state received is | fi>.Bob is according to above-mentioned measurement
Device completes the measurement and record work of signal.
By certified classical channel, Alice announces the basic vector and strength information of each quantum state；Bob is according to above-mentioned
Information retains the measurement result of corresponding basic vector.
The process and the general complete phase of process for inveigling state discrete variable QKD system of the error correction carried out below and privacy amplification
Together, it therefore is no longer described in detail.
The defect of the prior art: it for inveigling state QKD system, has to carry out phase randomization, i.e., each quantum state
Between relative phase be random.In existing system, i.e., the relative phase between each pulse group is random；Existing
In technology, since all pulses are to be obtained and carrying out intensity modulated to continuous wave laser, between adjacent pulse group
Phase is not randomization；In order to make phase randomization, it is necessary to identical to all pulses in each pulse group additional one
Random phase, implement extremely difficult.
In the X measuring device of the prior art, measurement is needed using multiple delay interference devices；Do not have in the existing structure
There is the structure of any polarization compensation, therefore polarization drift will be present than the pulse without delay in the pulsion phase through being delayed；Two-way arteries and veins
Punching polarization mismatchs will affect interference as a result, to influence finally measure as a result, make measurement error rate rising and
Efficiency decline.
Utility model content
The utility model proposes a kind of improved HD-QKD system, using the pulse generation device based on light injection technique,
And the X basic vector detecting module based on faraday rotation mirror is combined, solve in existing apparatus asking for phase randomization between pulse group
Topic, and realize the passive compensation of polarization drift.
A kind of receiving end of improved HD-QKD system, including by after the coding of transmitting terminal light pulse group be split
Beam splitting module, and the Z basic vector detecting module and X basic vector detecting module that are connected respectively with two output end of beam splitting module are special
Sign is, the X basic vector detecting module includes the intervention module with faraday rotation mirror and corresponding to optical pulse code dimension
Single-photon detector, each single-photon detector separately detects corresponding result of interference；
Intervention module with faraday rotation mirror includes one or more interference units, includes beam splitting in each interference unit
Device, delay line and two faraday rotation mirrors；
Light pulse group is incident to after the coding of each interference unit light pulse group via being divided into two-way after beam splitter after coding,
In all the way enter a faraday rotation mirror, another way after delay line enter another faraday rotation mirror；Light pulse group after coding
Again respectively by interfering and exporting along respective original route return beam splitter after the reflection of corresponding faraday rotation mirror.
The receiving end of the utility model uses the X basic vector detecting module of faraday rotation mirror, and polarization drift may be implemented
Passive compensation, is incorporated in HD-QKD system, can advanced optimize detection result.
Preferably, the interference unit is distributed step by step, previous stage interference unit exports two-way interference signal, and rear stage is dry
Relating to unit every two is one group, receives the two-way interference signal of previous stage interference unit output respectively；
Each single-photon detector in X basic vector detecting module receives the output of most final stage interference unit respectively.
It can be according to quantity, that is, optical pulse code dimension setting suitable number of single-photon detector in X basic vector detecting module
Interference unit, every primary interference of generation will obtain two-way output, occur if an interference unit is arranged again all the way for every
Primary interference, will obtain more outputs, and so on until quantity Matching with single-photon detector.
Each interference unit uses unequal arm structure in the utility model, can solve to polarize by the way that faraday rotation mirror is arranged
Drifting problem.
Preferably, the Z basic vector detecting module is a single-photon detector.To direct impulse group between each time
Every interior distribution situation.
The quantity of single-photon detector is corresponding to optical pulse code dimension in X basic vector detecting module, such as optical pulse code
Dimension is n, then needs n single-photon detector.
Preferably, optical pulse code dimension is 4.
Preferably, the intervention module with faraday rotation mirror includes:
First interference unit, into the coding of X basic vector detecting module after light pulse group interfered in the first interference unit,
And export the first optical signal and the second optical signal；
Second interference unit, receives the first optical signal and interferes, and third optical signal and the 4th light letter are exported after interference
Number；
Third interference unit, receives the second optical signal and interferes, and the 5th optical signal and the 6th light letter are exported after interference
Number；
The quantity of single-photon detector is four in X basic vector detecting module, receives detect the third optical signal, the respectively
Four optical signals, the 5th optical signal and the 6th optical signal.
The multiplexing of multichannel can be realized by modes such as setting optical fiber circulators in the optical path.
Preferably, be additionally provided with the first optical fiber circulator, into the coding of X basic vector detecting module after light arteries and veins group via this
One optical fiber circulator enters the first interference unit；
It is additionally provided with the second optical fiber circulator, first optical signal enters the second interference list via the second optical fiber circulator
Member；One is directly entered corresponding single-photon detector in third optical signal and the 4th optical signal, and another one is via the second optical fiber
Circulator enters corresponding single-photon detector；
It is additionally provided with third optical fiber circulator, second optical signal is successively via the first optical fiber circulator and third fiber optic loop
Shape device enters third interference unit；One is directly entered corresponding single-photon detector in 5th optical signal and the 6th optical signal,
Another one enters corresponding single-photon detector via third optical fiber circulator；
In second interference unit and third interference unit, the galianconism of one of them is (between beam splitter and faraday rotation mirror
Delay line is not set all the way, delay line is in contrast arranged can be considered long-armed all the way) it is equipped with phase-modulator.
The utility model also provides a kind of improved HD-QKD system, described including the transmitting terminal to match and receiving end
Receiving end is receiving end described in the utility model.
The transmitting terminal includes:
Mode based on light injection and internal modulation carries out basic vector modulation to light pulse and state is inveigled to modulate after obtaining coding
The phase-modulation light source of light pulse group；
Light pulse group is sent to the attenuator of receiving end after decaying after coding of the receiving from phase-modulation light source.
The transmitting terminal is injected based on light and the mode of internal modulation carries out basic vector modulation to light pulse and inveigles state modulation
Light pulse group after being encoded, then receiving end is sent to after decaying；The receiving end is by the light arteries and veins after the coding of transmitting terminal
It rushes after group is split and is utilized respectively Z basic vector detecting module and X basic vector detecting module is detected.
Preferably, the phase-modulation light source includes that phase prepares laser and pulse generation laser, the phase
Prepare laser and generate laser for generating long pulse and being injected into pulse, the long pulse has and optical pulse code dimension
Corresponding section, adjacent interval have presetting phase difference；
The pulse generates laser and is generated short pulse corresponding with optical pulse code dimension by long pulse injection to realize X
Basic vector modulation, the pulse generate laser and pass through change triggering electric signal also to realize that Z basic vector is modulated.
Such as optical pulse code dimension is n, the long pulse has n section, and adjacent interval passes through driving electric signal
Disturbance can have phase difference；It is directed to same long pulse, pulse generates laser and excites n short arteries and veins of generation after long pulse injects
Punching, each short pulse correspond to one of section of long pulse, since long pulse adjacent interval has presetting phase difference, accordingly
Two short pulses between also phase difference having the same.
The triggering electric signal is that pulse generates inside laser for generating the driving electric signal of light pulse, passes through change
Its voltage (or electric current) can obtain the light pulse group of varying strength, i.e. realization intensity internal modulation (modulation of Z basic vector).
The phase-modulation light source selects the modulation of X basic vector and the modulation of Z basic vector with the likelihood ratio of P/ (1-P) respectively.The value of P
It sets according to the actual application, and meets 0 < P < 1.
Preferably, the phase-modulation light source is additionally provided with the optical fiber circulator of three ports, the phase prepares laser
The long pulse that device generates, which inputs first port and enters pulse by second port, generates laser, and the pulse generates laser
Light pulse group inputs second port and exports by third port after the coding of generation.
Light pulse group is exported by the third port of optical fiber circulator to attenuator after the coding, to reception after decaying
End is sent.
The transmitting terminal of the utility model HD-QKD system is based on light injection technique, phase between pulse group in solution existing apparatus
The problem of position randomization；Light injection technique uses internal modulation scheme, is not necessarily to external intensity and phase-modulator, and its modulation is stablized
Property and rate are higher, while having simplified system structure and having made it easy to integrate.The receiving end of the utility model HD-QKD system, passes through
The mode of faraday rotation mirror solves the existing polarization drifting problem of existing apparatus.
Detailed description of the invention
Fig. 1 is the quantum state form schematic diagram in higher-dimension time encoding；
(a) the quantum state form of Z basic vector coding is partially illustrated；
(b) the quantum state form of X basic vector coding is partially illustrated；
Fig. 2 is the schematic diagram of higher-dimension time encoding QKD system in the prior art；
Fig. 3 is the schematic diagram that X basic vector measures part in Fig. 2；
Fig. 4 is the schematic diagram of pulse generation device in the utility model；
The driving voltage schematic diagram of laser when Fig. 5 is X basic vector modulation in the utility model；
The driving voltage schematic diagram of laser when Fig. 6 is Z basic vector modulation in the utility model；
Fig. 7 is the schematic diagram of X basic vector detecting module in the utility model.
Specific embodiment
The utility model HD-QKD system includes the transmitting terminal being mutually matched and receiving end, and transmitting terminal uses phase referring to fig. 4
Position modulated light source and attenuator (ATT), phase-modulation light source specifically include that phase prepares laser, pulse generates laser and
There are three the optical fiber circulator of port, phase prepares the long pulse input first port that laser generates and passes through second port tool
Injected pulse generates laser, and light pulse group inputs second port and passes through third end after pulse generates the coding that laser generates
Mouth output is retransmited to ATT to receiving end.
Transmitting terminal concrete operating principle are as follows:
Driving voltage drives phase to prepare laser and generates periodic long pulse；
The long pulse generates laser by optical fiber circulator injected pulse；
The driving voltage that pulse simultaneously generates laser drives it to generate (the light pulse after encoding of corresponding short pulse group
Group)；
Short pulse group decays its intensity to single photon level by ATT, sends to receiving end.
In transmitting terminal the phase-modulation of light pulse and intensity modulated can by adjust the driving voltage of two lasers come
It realizes, the specific modulator approach of two kinds of basic vectors is explained in detail below.
X basic vector is modulated, the driving voltage of two lasers is as shown in figure 5, voltage 0 corresponds to two lasers in figure
Threshold voltage.There are three voltage disturbances by a small margin in the driving voltage of long pulse: Δ U1, Δ U2With Δ U3；Long pulse is being disturbed
The two sides of dynamic voltage will have corresponding phase difference；By adjusting the size of these three disturbance voltages, adjustable corresponding phase
Potential difference；In the modulation of X basic vector, which is determined by the eigenstate for the X basic vector for needing to modulate, and sees formula (1)；Simultaneously three
In four sections that a disturbance voltage is separated into, pulse generates the driving that laser has corresponding 4 equal strength constant durations
Voltage drives the laser to generate the short pulse of 4 equal strength constant durations, and the relative phase of short pulse is corresponding length
The relative phase in pulse section；The intensity of short pulse depends on the intensity V of its driving voltage0, adjusting the value can be realized trick
State modulation.
Z basic vector is modulated, the driving voltage of laser is as described in Figure 6.It is any without having in the driving voltage of long pulse
Disturbance, while short pulse only has a driving voltage to generate a pulse, the position of the driving voltage depends on needing to modulate
Z basic vector eigenstate；Similarly, pulse strength depends on driving voltage V0, adjusting the value can be realized trick state modulation.
In light injected system, the relative phase of short pulse is directed to long pulse；Phase between each long pulse
It is randomization, this is because each long pulse is by corresponding driving voltage retriggered and laser is driven to generate, and swashs
Its impulse phase generated is random after each retriggered of light device；The randomness of long pulse phase finally to give birth to by it
At short pulse group phase it is random；Internal modulation can also be realized with time injection technique, pass through the tune to laser driving voltage
The modulation to realize impulse phase and intensity is made, this modulation system can be more more stable than external modulation higher speed.
The receiving end integral frame of the present embodiment can be found in Fig. 2, that is, include a beam splitter and Z basic vector detecting module and X
Basic vector detecting module, beam splitter by after the coding of transmitting terminal light pulse group be divided into two-way, all the way enter Z basic vector detect mould
Block, another way enter X basic vector detecting module, and Z basic vector detecting module is a single-photon detector.
The present embodiment is mainly improved in receiving end is X basic vector detecting module, referring to Fig. 7, in order to realize polarization compensation, and solution
Certainly polarize drifting problem, in the X basic vector detecting module of the present embodiment, the delay dress that utilizes faraday rotation mirror and delay line to constitute
Setting passively compensating polarizing to deviate, therefore when delay pulse group returns to beam splitter, polarization is rotated by 90 ° but does not drift about；
Delay pulse group is not turn 90 degrees corresponding another way partially through another faraday's reflecting mirror reflection rear polarizer；To two-way pulse group
Polarization is rotated by 90 ° and without polarization drift when interference.
It is 4 in conjunction with optical pulse code dimension, the X basic vector detecting module of the present embodiment specifically includes three interference units, three
A optical fiber circulator and four photodetectors.
First interference unit includes the first balance beam splitter (BS1), delay line 1, the first faraday rotation mirror (FM1) and the
Two faraday rotation mirrors (FM2)；
Second interference unit includes the second balance beam splitter (BS2), delay line 2, third faraday rotation mirror (FM3) and the
Four faraday rotation mirrors (FM4)；
Third interference unit includes third balance beam splitter (BS3), delay line 3, the 5th faraday rotation mirror (FM5), the
Six faraday rotation mirrors (FM6) and phase-modulator (PM).
Its course of work is explained in detail below:
Light pulse group (hereinafter referred to as pulse group) enters through optical fiber circulator (C1) after into the coding of X basic vector detecting module
First balance beam splitter (BS1)；
After BS1 beam splitting, transmitted pulse group reflects after the delay of delay line 1 through the first faraday rotation mirror (FM1), pulse
Polarization is rotated by 90 °；BS1 is returned to after the delay of delay line 1 again；Corresponding reflected impulse group is through the second faraday rotation mirror
(FM2) it reflects, polarization is rotated by 90 °；Then BS1 is returned, is interfered with above-mentioned delay pulse group in BS1.Delay line 1 prolongs
When the time be τ.
It is exported after the interference of pulse group by two ports of BS1, the pulse group of one of port output passes through the second light
Fine circulator (C2) enters second balance beam splitter (BS2) beam splitting afterwards；Reflected impulse group is revolved via delay line 2 and third faraday
BS2 is returned to after the time-delay mechanism delay that tilting mirror (FM3) is constituted, the delay time of delay line 2 is τ/2；Corresponding transmitted pulse group
BS2 is returned to after the reflection of the 4th faraday rotation mirror (FM4)；Two-way pulse group is interfered in BS2, then all the way pulse group into
Enter the first photodetector (D1) detected and another way pulse group through C2 enter the 0th photodetector (D0) measure.
The pulse group of the another port BS1 output enters third by C1 and third optical fiber circulator (C3) afterwards and balances beam splitter
(BS3) beam splitting；Transmitted pulse group is modulated via the pi/2 phase that phase-modulator (PM) is fixed；With afterpulse group through the 6th
BS3 is returned to after faraday rotation mirror (FM6) reflection；Meanwhile reflected impulse group is via delay line 3 and the 5th faraday rotation mirror
(FM5) BS3 is returned to after the time-delay mechanism delay constituted, the delay time of delay line 3 is τ/2；Two-way pulse group occurs dry in BS3
It relates to, interference pulse group is directly entered third photodetector (D3) and measures all the way, and another way pulse group enters via C3
Second photodetector (D2) is detected.
Its measurement result depends on aforementioned four detector, and which has response in third time interval, this and original device
It is identical.
The present embodiment is by taking optical pulse code dimension 4 as an example, by the photodetection for similarly configuring respective numbers when other dimensions
Device and interference unit.
Disclosed above is only the embodiments of the present invention, but the utility model is not limited to this, this field
Technical staff can carry out various modification and variations without departing from the spirit and scope of the utility model to the utility model.Obviously
These modification and variations should belong in the protection scope protection of the requires of the utility model.In addition, although being used in this specification
Some specific terms, these terms are merely for convenience of description, does not constitute to the utility model any specifically limited.
Claims (9)
1. a kind of receiving end of improved HD-QKD system, including by after the coding of transmitting terminal light pulse group be split
Beam splitting module, and the Z basic vector detecting module and X basic vector detecting module that are connected respectively with two output end of beam splitting module, feature
It is, the X basic vector detecting module includes the intervention module with faraday rotation mirror and corresponding with optical pulse code dimension
Single-photon detector, each single-photon detector separately detect corresponding result of interference；
Intervention module with faraday rotation mirror includes one or more interference units, include in each interference unit beam splitter,
Delay line and two faraday rotation mirrors；
Light pulse group is via two-way is divided into after beam splitter after light pulse group is incident to the coding of each interference unit after coding, wherein one
Road enters a faraday rotation mirror, and another way enters another faraday rotation mirror after delay line；Light pulse group is divided again after coding
Not by interfering and exporting along respective original route return beam splitter after the reflection of corresponding faraday rotation mirror.
2. the receiving end of improved HD-QKD system as described in claim 1, which is characterized in that the interference unit is divided step by step
Cloth, previous stage interference unit export two-way interference signal, and rear stage interference unit every two is one group, and it is dry to receive previous stage respectively
Relate to the two-way interference signal of unit output；
Each single-photon detector in X basic vector detecting module receives the output of most final stage interference unit respectively.
3. the receiving end of improved HD-QKD system as described in claim 1, which is characterized in that the Z basic vector detecting module
For a single-photon detector.
4. the receiving end of improved HD-QKD system as described in claim 1, which is characterized in that dry with faraday rotation mirror
Relating to module includes:
First interference unit, into the coding of X basic vector detecting module after light pulse group interfered in the first interference unit, and it is defeated
First optical signal and the second optical signal out；
Second interference unit receives the first optical signal and interferes, third optical signal and the 4th optical signal are exported after interference；
Third interference unit receives the second optical signal and interferes, the 5th optical signal and the 6th optical signal are exported after interference；
The quantity of single-photon detector is four in X basic vector detecting module, receives detect the third optical signal, the 4th light respectively
Signal, the 5th optical signal and the 6th optical signal.
5. the receiving end of improved HD-QKD system as claimed in claim 4, which is characterized in that be additionally provided with the first fiber annular
Device, into the coding of X basic vector detecting module after light pulse classic by first optical fiber circulator enter the first interference unit；
It is additionally provided with the second optical fiber circulator, first optical signal enters the second interference unit via the second optical fiber circulator；The
One is directly entered corresponding single-photon detector in three optical signals and the 4th optical signal, and another one is via the second optical fiber circulator
Into corresponding single-photon detector；
It is additionally provided with third optical fiber circulator, second optical signal is successively via the first optical fiber circulator and third optical fiber circulator
Into third interference unit；One is directly entered corresponding single-photon detector in 5th optical signal and the 6th optical signal, another
Person enters corresponding single-photon detector via third optical fiber circulator；
In second interference unit and third interference unit, the galianconism of one of them is equipped with phase-modulator.
6. a kind of improved HD-QKD system, including the transmitting terminal to match and receiving end, which is characterized in that the receiving end is
The described in any item receiving ends of Claims 1 to 5.
7. improved HD-QKD system as claimed in claim 6, which is characterized in that the transmitting terminal includes:
Mode based on light injection and internal modulation carries out basic vector modulation to light pulse and trick state modulates light arteries and veins after being encoded
The phase-modulation light source of punching group；
Light pulse group is sent to the attenuator of receiving end after decaying after coding of the receiving from phase-modulation light source.
8. improved HD-QKD system as claimed in claim 7, which is characterized in that the phase-modulation light source includes phase level
Standby laser and pulse generate laser, and the phase prepares laser and generates laser for generating long pulse and being injected into pulse
Device, the long pulse have section corresponding with optical pulse code dimension, and adjacent interval has presetting phase difference；
The pulse generates laser and is generated short pulse corresponding with optical pulse code dimension by long pulse injection to realize X basic vector
Modulation, the pulse generate laser and pass through its triggering electric signal of change also to realize that Z basic vector is modulated.
9. improved HD-QKD system as claimed in claim 8, which is characterized in that the phase-modulation light source is additionally provided with three
The optical fiber circulator of port, the phase prepare the long pulse input first port that laser generates and enter by second port
Pulse generates laser, and light pulse group inputs second port and passes through third end after the pulse generates the coding that laser generates
Mouth output.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108540283A (en) * | 2018-05-02 | 2018-09-14 | 如般量子科技有限公司 | A kind of improved HD-QKD systems |
| CN113472522A (en) * | 2020-03-31 | 2021-10-01 | 科大国盾量子技术股份有限公司 | Receiving device, verifying device, QKD system and quantum communication method |
-
2018
- 2018-05-02 CN CN201820642987.0U patent/CN208386565U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108540283A (en) * | 2018-05-02 | 2018-09-14 | 如般量子科技有限公司 | A kind of improved HD-QKD systems |
| CN113472522A (en) * | 2020-03-31 | 2021-10-01 | 科大国盾量子技术股份有限公司 | Receiving device, verifying device, QKD system and quantum communication method |
| CN113472522B (en) * | 2020-03-31 | 2022-09-16 | 科大国盾量子技术股份有限公司 | Receiving device, verifying device, QKD system and quantum communication method |
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