CN109586799A - A kind of the polarization feedback method and its device of polarization encoder measuring device system without interaction - Google Patents
A kind of the polarization feedback method and its device of polarization encoder measuring device system without interaction Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
- H04L9/0816—Key establishment, i.e. cryptographic processes or cryptographic protocols whereby a shared secret becomes available to two or more parties, for subsequent use
- H04L9/0852—Quantum cryptography
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/70—Photonic quantum communication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
- H04L9/0816—Key establishment, i.e. cryptographic processes or cryptographic protocols whereby a shared secret becomes available to two or more parties, for subsequent use
- H04L9/0852—Quantum cryptography
- H04L9/0855—Quantum cryptography involving additional nodes, e.g. quantum relays, repeaters, intermediate nodes or remote nodes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
- H04L9/0816—Key establishment, i.e. cryptographic processes or cryptographic protocols whereby a shared secret becomes available to two or more parties, for subsequent use
- H04L9/0852—Quantum cryptography
- H04L9/0858—Details about key distillation or coding, e.g. reconciliation, error correction, privacy amplification, polarisation coding or phase coding
Abstract
The invention discloses a kind of polarization feedback method of polarization encoder measuring device system without interaction and its devices.The end Alice, the end Bob, the end Charlie that polarization feedback method is used to calibrate the system automatically make this three end while meeting base mistake unanimously, the following steps are included: regulating step one, adjust the end Alice and Charlie end group loses unanimously: the two-way after the beam splitter BS of the end Charlie is respectively to swear consistent H/V basic vector and P/N basic vector measurement end with Alice end group；Pacing saves two suddenly, becomes estranged P/N base mistake measurement end using the H/V base at the end Charlie of calibrated completion to adjust the base mistake at the end Bob, and the H/V base at the end Bob is made to become estranged P/N base mistake base mistake corresponding to the end Charlie unanimously.The present invention calibrates three ends of the system automatically while meeting base mistake unanimously, solves the problems, such as that the three end groups arrow of MDIQKD mismatches and easily causes high bit-error.
Description
Technical field
The present invention relates to a kind of polarization feedback method of quantum encryption communication technological system, specifically a kind of polarization encoder is surveyed
Measure unrelated (Measurement-device-independent quantum key distribution, the MDIQKD) system of equipment
The polarization feedback method of system.
Background technique
In polarization encoder MDIQKD system, the end Alice and the end Bob are all used as transmitting terminal, and the end Charlie is as receiving end.
The end Alice and the end Bob independently prepare 4 kinds of polarization states according to polarization encoder scheme, such as H, V, P, N state.The end Charlie is then right
The polarization state that the end Alice and the end Bob are sent carries out the measurement of bell state, obtains bell state, such as
WithReduce the bit error rate to accurately measure Bell state, it is desirable that the end Alice and the end Bob with
And the end Charlie must enjoy identical polarization reference system.Then polarization feedback purpose be exactly so that the end Alice, the end Bob and
Charlie enjoys at end identical polarization reference system.
The polarization feedback of polarization encoder MDIQKD system at present, a kind of mode is to manually adjust polarization state: it is manual to carry out QKD
The tetra- kinds of basic vectors arrival receiving ends H, V, P, N for adjusting the calibration end Alice and the end Bob are all consistent.Another is semi-automatic
The scheme of adjusting, such as " the Experimental Demonstration of Polarization Encoding of bibliography 1
Measurement-Device-Independent Quantum Key Distribution ", it is specific such as Fig. 1 MDIQKD device
Schematic diagram.
In Fig. 1, region (a) is that the end Alice and the end Bob are (adjoint to the end the Charlie output weak coherent pulse of polarization encoder
Inveigle state) schematic diagram.The end Charlie utilizes beam splitter (BS), polarising beam splitter (PBS) and single-photon detector after receiving
Carry out Bell state measurement.Region (b) be Polarization Controller (namely in Fig. 1 region (a) three axis optical fiber squeezer fiber
Squeezers schematic diagram).Region (c) be geometrically showed in poincare sphere the end Alice and the end Bob referential calibration show
It is intended to.
This needs to be adjusted jointly with electric Polarization Controller (EPC) to realize by manual Polarization Controller (PC).The area Tu1Zhong
Domain (b) is the schematic diagram of electric Polarization Controller (EPC), wherein three 0 ° of adjustings respectively are contained, 45 °, 0 ° of optical fiber squeezer
(being controlled by piezoelectric actuator).
Firstly, the end Alice and the end Bob the end Charlie by the polarization state of their right angle basic vector (H/V basic vector) (H and
V state) it is aligned with the polarization axle of the polarization beam apparatus (PBS) at the end Charlie.This can be by allowing the end Alice and the end Bob to send H
Polarization state pulse minimizes the detection contrast of two corresponding output ends of PBS (by single-photon detector with manual PC is adjusted
Measurement) Lai Shixian.At this point, they have identical right angle basic vector shown in region (c) as shown in figure 1, on Pa'anga's ball, wherein
The polarization state when reaching the end Charlie is identical with H the and V state that Bob is sent for H the and V state that Alice is sent, and with
The polarization axle of the polarization beam apparatus (PBS) at the end Charlie is aligned.The H/V basic vector at the end Alice and the end Bob can be adjusted in this way
Unanimously.The polarization axle of the polarization beam apparatus (PBS) at the end Charlie is also the polarization axle of H/V basic vector at this time.
Then, the end Alice and the end Bob are at the end Charlie by the polarization state (P of their diagonally opposing corner basic vector (P/N basic vector)
With N state) alignment.What needs to be explained here is that the process of above-mentioned alignment right angle basic vector (H/V basic vector) also requires that the end Alice
H polarization state and be placed in the region Fig. 1 (b) at the end Alice first (since left) optical fiber in electric Polarization Controller (EPC)
The fast axle or slow axis of squeezer are aligned.On this basis, apply voltage on first squeezer, so that between slow axis and fast axle
There is relative phase variation.As shown in figure 1 shown in region (c), this is equivalent to the end Alice and has done one to H/V basic vector in poincare sphere
Orthogonal transformation U, so that it becomes P/N basic vector ((|H>±|V>)).The voltage is adjusted, until the diagonally opposing corner at the end Alice
Basic vector is aligned with the diagonally opposing corner basic vector at the end Bob, calibration finish (original English text be " The voltage is adjusted such
that their circular bases are aligned.").The voltage of first squeezer is arranged back after calibration finishes
Alice calibrates the state of right angle basic vector, then this operation will not influence the right angle basic vector calibrated before the end Alice.
In addition to this, in the standard BB84 system different from MDIQKD system, the end Alice is made as transmitting terminal, the end Bob
For receiving end.Polarization feedback purpose is so that identical polarization reference system is enjoyed at the end Alice, the end Bob.Typical polarization feedback system
System is illustrated in fig. 2 shown below, and mainly includes a beam splitter BS, two-way Polarization Controller, two polarization beam apparatus and 4 single photons
Detector.Receiving end is selected using passive basic vector, and the detector of H/V basic vector and P/N basic vector is in separated optical path after beam splitter
In, then H/V and P/N basic vector polarization feedback scheme independent can be used simply.Such as first carry out the inclined of H/V basic vector
Then vibration feedback carries out the polarization feedback of P/N basic vector.H/V is polarized and is fed back, the end Alice sends H polarised light, receiving end root
The contrast level counted with the road V is counted according to the road H, determines that the EPC on the road feedback compensation amount Bing Dui H/V implements control.When final
The contrast of polarization feedback is met the requirements, and locks the electrical voltage point, completes polarization feedback.
The above-mentioned problems of the prior art:
1) automatic polarization feedback is not implemented in polarization encoder MDIQKD system, if the bit error rate is more than threshold value in system operation,
So manual adjustment is needed to calibrate, this is unfavorable for system automation processing and is unfavorable for industrialization.In addition, the accuracy manually adjusted
It is low, it can not move and more accurate three ends polarization calibration is carried out to the end Alice, the end Bob, the end Charlie.If can not accurate calibration,
Code rate can be then influenced into a certain extent.
2) the automatically controlled Polarization Controller that bibliography 1 uses is (in Fig. 1 in the fiber squeezers or Fig. 1 in region (a)
Region (b)), it needs in Alice and Charlie alignment right angle basic vector (H/V basic vector), while making the same Fig. 1 of polarization state H state
(b) in electric Polarization Controller first (since left) optical fiber squeezer fast axle or slow axis alignment.Subsequent operation relies on should
Condition could be completed, and calibration in this way proposes high requirement to automatically controlled Polarization Controller, also compare the mode of operation of the device
Trouble.
3) bibliography 1 is not to the " The during the end Alice and the end Bob alignment diagonally opposing corner basic vector (P/N basic vector)
Voltage is adjusted such that their circular bases are aligned. " is (" by adjusting electricity
Pressure, until the diagonally opposing corner basic vector at the end Alice is aligned with the diagonally opposing corner basic vector at the end Bob ") do more explanations.Detect diagonally opposing corner base
The device and detection signal whether arrow is aligned are what is not handed over.Conventionally, the detection of polarization state is generally needed
The PBS of corresponding basic vector, such as the polarization state of diagonally opposing corner basic vector is utilized to need to detect outlet light intensity with the PBS of diagonally opposing corner basic vector
Contrast, and it is then not all right with other basic vectors.And the PBS of this bibliography 1 the end Alice, the end Bob calibration right angle basic vector when
Polarization axle through the polarization beam apparatus (PBS) with the end Charlie is aligned, and there is no the PBS of diagonally opposing corner basic vector is available.
4) in comparison, the polarization feedback of the BB84 system of polarization encoder, although having using automatically automatically controlled polarization feedback
Scheme, but and not applicable directly apply to MDIQKD system.Because standard BB84 system only need one transmitting terminal of calibration and
The polarization of one receiving end, so that polarization reference system is consistent；And MDIQKD is needed because being related to 2 transmitting terminals and a receiving end
Wanting tripartite to meet simultaneously, referential is consistent, and otherwise the bit error rate can increase.
Summary of the invention
High bit-error is easily caused in order to solve the problems, such as that the three end groups arrow of MDIQKD mismatches, and overcomes non-automatic feedback
And the shortcomings that being difficult to control accurately is manually adjusted, the present invention provides a kind of polarization feedback method of polarization encoder MDIQKD system,
The polarization feedback method can using existing MDIQKD system without additional detection device, to Alice, Bob,
Tri- end Charlie carries out accurate automatic calibration.
Technical problems to be solved needed for the present invention can be achieved through the following technical solutions: a kind of polarization encoder survey
The polarization feedback method for measuring equipment system without interaction, is used to calibrate the end Alice, the end Bob, the end Charlie of the system automatically
Make this three end while meeting base mistake unanimously；The polarization feedback method the following steps are included:
Regulating step one adjusts the end Alice and Charlie end group loses unanimously: two after the beam splitter BS of the end Charlie
Road is respectively to swear consistent H/V basic vector and P/N basic vector measurement end with Alice end group；
Pacing saves two suddenly, becomes estranged P/N base mistake measurement end using the H/V base at the end Charlie of calibrated completion to adjust Bob
The base at end loses, and the H/V base at the end Bob is made to become estranged P/N base mistake base mistake corresponding to the end Charlie unanimously.
As a further improvement of the foregoing solution, the polarization feedback method further includes regulating step three, by the end Charlie
P/N base mistake revert to H/V base lose the step of.
As a further improvement of the foregoing solution, regulating step one adjusting method the following steps are included:
So that the end Alice is sent H polarization state laser first, enters Charlie by beam splitter BS 1:1 at the end Charlie
In detector D1, detector D2 and the detector D3 at end, detector D4, the counting of detector D1 and detector D2 are paid close attention at this time
Rate, adjust beam splitter BS after two-arm one Polarization Controller EPC-1 make D1 ︰ D2 polarization feedback contrast meet setting
It is required that；
The electrical voltage point of Polarization Controller EPC-1 herein is locked, at this point, in the two-way after beam splitter BS, Polarization Control
Device EPC-1, detector D1 and detector D2 are set to measurement H/V basic vector all the way；
So that the end Alice is sent P polarization state laser, enters detector by beam splitter BS 1:1 at the end Charlie
In D1, detector D2 and detector D3, detector D4, the counting rate of detector D3 and detector D4 are paid close attention at this time, adjust light point
The Polarization Controller EPC-2 of two-arm one makes the contrast of D3 ︰ D4 polarization feedback meet sets requirement after beam device BS；
The electrical voltage point of Polarization Controller EPC-2 herein is locked, at this point, in the two-way after beam splitter BS, Polarization Control
Device EPC-2, detector D3 and detector D4 are set to measurement P/N basic vector all the way.
As a further improvement of the foregoing solution, the adjusting method of regulating step two are as follows:
It controls the end Bob and sends out H laser；
Inquire the D1 ︰ D2 contrast of Charlie；
It controls the end Bob and sends out P laser；
Inquire the D3 ︰ D4 contrast of Charlie；
The contrast of comprehensive D1 ︰ D2 and D3 ︰ D4, judge whether the contrast meets target contrast requirement.If full
It is sufficient then terminate, it otherwise first calculates the voltage compensation quantity of Polarization Controller EPC-B and issues, return again to step: " the control end Bob hair H
Laser " continues iteration.
Further, the adjusting method of regulating step three are as follows: the end Bob or the end Alice is enabled to send H laser, the end Charlie school
The Polarization Controller EPC-2 of P/N basic vector all the way after quasi-optical beam splitter BS, so that P/N basic vector state transformation is H/V basic vector shape
State.
The present invention also provides a kind of polarization feedback device of polarization encoder measuring device system without interaction, it is used to calibrate automatically
The end Alice, the end Bob, the end Charlie of the system make this three end while meeting base mistake unanimously；The polarization feedback device packet
It includes:
Adjustment module one, be used to adjust the end Alice and Charlie end group lose it is consistent: the end Charlie beam splitter BS it
Two-way afterwards is respectively to swear consistent H/V basic vector and P/N basic vector measurement end with Alice end group；
Adjustment module two, the P/N base that is used to become estranged using the H/V base at the end Charlie of calibrated completion, which loses measurement end, to be come
The base for adjusting the end Bob loses, make the H/V base at the end Bob become estranged P/N base lose lost with the base at the end Alice, the end Charlie it is consistent.
As a further improvement of the foregoing solution, the polarization feedback device further includes adjustment module three, be used for by
The P/N base mistake of detector D3 and detector the D4 locking at the end Charlie reverts to the mistake of H/V base.
As a further improvement of the foregoing solution, the adjustment module one includes:
Polarization Controller EPC-1 and its control driving unit；
Polarization Controller EPC-2 and its control driving unit；
H/V basic vector unit, the laser for being used to that the end Alice to be made to send H polarization state first, at the end Charlie by light point
Beam device BS 1:1 enters detector D1, detector D2 and the detector D3 at the end Charlie, in detector D4, at this point, only focusing on spy
The counting rate of device D1 and detector D2 are surveyed, the Polarization Controller EPC-1 of two-arm one makes D1 ︰ D2 inclined after adjusting beam splitter BS
The contrast of vibration feedback meets sets requirement；
Lock cell one is used to lock the electrical voltage point of Polarization Controller EPC-1 herein, at this point, after beam splitter BS
Two-way in, Polarization Controller EPC-1, detector D1 and detector D2 be set to measurement H/V basic vector all the way；P/N base
It swears unit, is used to that the end Alice to be made to send P polarization state laser, enter detector by beam splitter BS 1:1 at the end Charlie
In D1, detector D2 and detector D3, detector D4, the counting rate of detector D3 Yu detector D4 are only focused at this time, adjust light
The Polarization Controller EPC-2 of two-arm one makes the contrast of D3 ︰ D4 polarization feedback meet sets requirement after beam splitter BS；
Lock cell two is used to lock the electrical voltage point of Polarization Controller EPC-2 herein, at this point, after beam splitter BS
Two-way in, Polarization Controller EPC-2, detector D3 and detector D4 be set to measurement P/N basic vector all the way.
As a further improvement of the foregoing solution, the adjustment module two includes:
Polarization Controller EPC-B and its control driving unit；
H Laser control unit is used to control the end Bob hair H laser；
Query unit one is used to inquire the D1 ︰ D2 contrast of Charlie；P Laser control unit is used to control Bob
End hair P laser；
Query unit two is used to inquire the D3 ︰ D4 contrast of Charlie；
Judging unit is used to integrate the contrast of D1 ︰ D2 and D3 ︰ D4, judges whether the contrast meets target pair
Than degree requirement；
Computing unit is used to first calculate Polarization Controller when the contrast is unsatisfactory for target contrast requirement
The voltage compensation quantity of EPC-B simultaneously issues, and restarts H Laser control unit and continues iteration；And meet target pair in the contrast
Then terminate iteration when requiring than degree.
The present invention also provides a kind of polarization encoder measuring device system without interaction, apply above-mentioned arbitrary polarization feedback side
Method；The light that the end Alice of the system and the light source transmitting terminal at the end Bob are sent is respectively delivered to the end Charlie of the system
Beam splitter BS two input ports, the wherein light of the light source transmitting terminal at the end Bob (or the end Alice) and the end Charlie
A Polarization Controller EPC-B is inserted between the respective input mouth of beam splitter BS；In two output ends of beam splitter BS
Behind mouthful in optical path, the output port one of beam splitter BS passes through Polarization Controller EPC-1 connection polarising beam splitter PBS1,
Then two output ends of polarising beam splitter PBS1 are separately connected the detector D1 and D2 of the system, and beam splitter BS's is defeated
Exit port two is by Polarization Controller EPC-2 connection polarising beam splitter PBS2, and then the two of polarising beam splitter PBS2 are defeated
Outlet is separately connected the detector D3 and D4 of the system.
The polarization encoder MDIQKD system of the prior art is using manually adjusting, and method is not automatic and accuracy is adjusted not as good as automatic
Section, will affect system into code rate.Our rule realizes high-precision polarization feedback regulation by full automatic feedback method.It compares
Bibliography 1 is to right angle basic vector (H/V basic vector) calibration process to the automatically controlled Polarization Controller (fiber in region (a) in Fig. 1
Region (b) in squeezers or Fig. 1) requirement --- polarization state H state that Alice is generated is the same as first light in electric Polarization Controller
The fast axle or slow axis of fine squeezer are aligned, and this method does not have automatically controlled Polarization Controller in right angle basic vector (H/V basic vector) calibration process
There is the requirement, operation is simpler, feeds back more quick；Compared to bibliography 1 to diagonally opposing corner basic vector (P/N basic vector) calibration process
In " The voltage is adjusted such that their circular bases are aligned. " it is unclear
The explanation of Chu, and may have been utilized other devices based on what this inferred, the polarization feedback method that this method proposes can be using now
Some MDIQKD systems succinctly are easier to reduce cost and industry without additional detection device so that system flow becomes apparent from
Change.
Detailed description of the invention
Fig. 1 is the polarization feedback light path figure of existing measuring device system without interaction.
Fig. 2 is the polarization feedback light path figure of existing polarization encoder BB84 system.
Fig. 3 is a kind of polarization encoder measuring device system without interaction of the invention.
Fig. 4 is a kind of polarization feedback method flow chart of polarization encoder measuring device system without interaction of the invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Embodiment 1
It is monitored in polarization encoder measuring device system without interaction initial phase shown in Fig. 3 and QKD working stage
When compared with high bit-error situation, system starts polarization feedback mechanism automatically.As shown in figure 4, polarization encoder measuring device of the invention
The polarization feedback method of system without interaction, be used to calibrate automatically the system the end Alice, the end Bob, the end Charlie make this three
End meets base simultaneously and loses consistent, and steps are as follows describes for the concrete scheme of the polarization feedback method.
1) it is consistent with Charlie basic vector to adjust Alice
Adjust that Alice is consistent with Charlie basic vector refers mainly to: the two-way after the beam splitter BS of the end Charlie is respectively
Consistent H/V basic vector and P/N basic vector measurement end are sweared with Alice end group.
The end Alice and the consistent adjusting method of Charlie end group mistake are as follows:
The end Alice is set to send H polarization state laser first, at the end Charlie, H polarization state laser passes through 1 ︰ of beam splitter BS
1 enters detector D1, detector D2 and the detector D3 at the end Charlie, in detector D4.
The counting rate of D1 Yu two detectors of D2 are only focused at this time, adjust the Polarization Control of two-arm one after beam splitter BS
Device EPC-1 makes the contrast of D1 ︰ D2 polarization feedback meet sets requirement, such as D2 > 100 D1 ︰.Lock Polarization Controller herein
The electrical voltage point of EPC-1.At this point, in two-way after beam splitter BS, Polarization Controller EPC-1, detector D1 and detector D2
It is set to measurement H/V basic vector all the way.
The end Alice is then set to send P polarization state laser, at the end Charlie, P polarization state laser passes through beam splitter BS 1:
1 enters in detector D1, detector D2 and detector D3, detector D4.
The counting rate of D3 Yu two detectors of D4 are only focused at this time, adjust the Polarization Control of two-arm one after beam splitter BS
Device EPC-2 makes the contrast of D3 ︰ D4 polarization feedback meet sets requirement, such as D4 > 100 D3 ︰.Lock Polarization Controller herein
EPC-2 electrical voltage point.At this point, EPC-2, detector D3 and detector D4 are set to survey in two-way after beam splitter BS
Measure P/N basic vector all the way.
At this point, the two-way after the BS of the end Charlie is respectively to swear that consistent HV basic vector and PN basic vector measure with Alice end group
End.
2) Bob end group arrow is adjusted using the HV basic vector at the end Charlie of calibrated completion and PN basic vector measurement end, is made
The HV basic vector and PN basic vector at the end Bob and the end Alice, Charlie end group arrow are consistent.
As shown in figure 4, concrete mode is preferred are as follows:
It controls the end Bob and sends out H laser；
Inquire the D1 ︰ D2 contrast of Charlie；
It controls the end Bob and sends out P laser；
Inquire the D3 ︰ D4 contrast of Charlie；
Do the contrast of comprehensive D1 ︰ D2 and D3 ︰ D4, judge that the contrast meets target contrast requirement? if full
It is sufficient then terminate, it otherwise first calculates the voltage compensation quantity of Polarization Controller EPC-B and issues, return again to step: " the control end Bob hair H
Laser ".
3) since two PBS can be adjusted to phase by the Bell state measurement end of the receiving end Charlie of MDIQKD system
Same basic vector, for example be all H/V basic vector, it is possible to by the basic vector P/N of the D3 detector at the end Charlie and the locking of D4 detector
Revert to basic vector H/V.Detailed process: enabling the end Bob (or the end Alice) to send H state light, and P/N basic vector after BS is calibrated at the end Charlie
EPC-2 all the way, so that P/N basic vector state transformation is H/V basic vector state.
For the polarization encoder MDIQKD system of the prior art using manually adjusting, method is not automatic, and accuracy is not as good as automatic
It adjusts, will affect system into code rate.Our rule realizes high-precision polarization feedback regulation by full automatic feedback method.Phase
Than bibliography 1 to right angle basic vector (H/V basic vector) calibration process to the automatically controlled Polarization Controller (fiber in region (a) in Fig. 1
Region (b) in squeezers or Fig. 1) requirement --- polarization state H state that Alice is generated is the same as first light in electric Polarization Controller
The fast axle or slow axis of fine squeezer are aligned, and this method does not have automatically controlled Polarization Controller in right angle basic vector (H/V basic vector) calibration process
There is the requirement, operation is simpler, feeds back more quick；Compared to bibliography 1 to diagonally opposing corner basic vector (P/N basic vector) calibration process
In " The voltage is adjusted such that their circular bases are aligned. " it is unclear
The explanation of Chu, and may have been utilized other devices based on what this inferred, the polarization feedback method that this method proposes can be using now
Some MDIQKD systems succinctly are easier to reduce cost and industry without additional detection device so that system flow becomes apparent from
Change.
Embodiment 2
The polarization feedback method of polarization encoder measuring device system without interaction of the present invention can be set to modular organization, such as set
The polarization feedback device of corresponding polarization encoder measuring device system without interaction is counted into, the polarization feedback device for calibrating automatically
The end Alice, the end Bob, the end Charlie of the system make this three end while meeting base mistake unanimously comprising adjustment module one is adjusted
Save module two, adjustment module three.
Adjustment module one is lost unanimously for adjusting the end Alice and Charlie end group: after the beam splitter BS of the end Charlie
Two-way be respectively and Alice end group swears consistent H/V basic vector and P/N basic vector measurement end.The adjustment module one is polarized including H
State unit, lock cell one, P polarization state unit, lock cell two.
H polarization state unit passes through beam splitter BS for making the end Alice send H polarization state laser first, at the end Charlie
1:1 enters detector D1, detector D2 and the detector D3 at the end Charlie, in detector D4, at this point, only focusing on detector D1
With the counting rate of detector D2, adjust beam splitter BS after two-arm one Polarization Controller EPC-1 make D1 ︰ D2 polarization feedback
Contrast meet sets requirement.Lock cell one is used to lock the electrical voltage point of Polarization Controller EPC-1 herein, at this point, light point
In two-way after beam device BS, Polarization Controller EPC-1, detector D1 and detector D2 are set to measurement H/V basic vector
All the way.P polarization state unit for make the end Alice send P polarization state laser, the end Charlie by beam splitter BS 1:1 into
Enter detector D1, detector D2 and detector D3, in detector D4, only focuses on the counting of detector D3 Yu detector D4 at this time
Rate, adjust beam splitter BS after two-arm one Polarization Controller EPC-2 make D3 ︰ D4 polarization feedback contrast meet setting
It is required that.Lock cell two is used to lock the electrical voltage point of Polarization Controller EPC-2 herein, at this point, the two-way after beam splitter BS
In, Polarization Controller EPC-2, detector D3 and detector D4 are set to measurement P/N basic vector all the way.
Adjustment module two is used to become estranged P/N base mistake measurement end using the H/V base at the end Charlie of calibrated completion to adjust
The base at the end Bob loses, make the H/V base at the end Bob become estranged P/N base lose lost with the base at the end Alice, the end Charlie it is consistent.
The adjustment module two includes: H Laser control unit, is used to control the end Bob hair H laser；Query unit one,
For inquiring the D1 ︰ D2 contrast of Charlie；P Laser control unit is used to control the end Bob hair P laser；Query unit two,
Its D3 ︰ D4 contrast for being used to inquire Charlie；Judging unit is used to integrate the contrast of D1 ︰ D2 and D3 ︰ D4, judges institute
State contrast and meet target contrast requirement? computing unit, is used to be unsatisfactory for target contrast in the contrast wanting
When asking, first calculates the voltage compensation quantity of Polarization Controller EPC-B and issue, restart H Laser control unit.
Adjustment module three is used to the P/N base mistake of the detector D3 at the end Charlie and detector D4 locking reverting to H/V base
It loses.The adjustment module three enables the end Bob or the end Alice sends H laser, and P/N basic vector after beam splitter BS is calibrated at the end Charlie
Polarization Controller EPC-2 all the way, so that P/N basic vector state transformation is H/V basic vector state.
Due to the polarization feedback method and polarization encoder measuring device of polarization encoder measuring device system without interaction of the invention
The polarization feedback device of system without interaction corresponds, then this is to polarization feedback device with regard to not carrying out repeating discussion.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (10)
1. a kind of polarization feedback method of polarization encoder measuring device system without interaction, is used to calibrate the system automatically
The end Alice, the end Bob, the end Charlie make this three end while meeting base mistake unanimously；It is characterized by: the polarization feedback method packet
Include following steps:
Regulating step one, adjusts the end Alice and Charlie end group loses unanimously: the two-way point after the beam splitter BS of the end Charlie
Consistent H/V basic vector and P/N basic vector measurement end Wei not be sweared with Alice end group；
Pacing saves two suddenly, becomes estranged P/N base mistake measurement end using the H/V base at the end Charlie of calibrated completion to adjust the end Bob
Base loses, and the H/V base at the end Bob is made to become estranged P/N base mistake base mistake corresponding to the end Charlie unanimously.
2. the polarization feedback method of polarization encoder measuring device system without interaction as described in claim 1, which is characterized in that described
Polarizing feedback method further includes regulating step three, and the P/N base mistake at the end Charlie is reverted to the step of H/V base loses.
3. the polarization feedback method of polarization encoder measuring device system without interaction as described in claim 1, it is characterised in that: adjust
The adjusting method of step 1 the following steps are included:
So that the end Alice is sent H polarization state laser first, enters the end Charlie by beam splitter BS 1:1 at the end Charlie
In detector D1, detector D2 and detector D3, detector D4, the counting rate of detector D1 and detector D2 are paid close attention at this time, are adjusted
The Polarization Controller EPC-1 of two-arm one makes the contrast of D1 ︰ D2 polarization feedback meet sets requirement after section beam splitter BS；
The electrical voltage point of Polarization Controller EPC-1 herein is locked, at this point, in the two-way after beam splitter BS, Polarization Controller
EPC-1, detector D1 and detector D2 are set to measurement H/V basic vector all the way；
So that the end Alice is sent P polarization state laser, enters the end Charlie by beam splitter BS 1:1 at the end Charlie
In detector D1, detector D2 and detector D3, detector D4, the counting rate of detector D3 and detector D4 are paid close attention at this time, are adjusted
The Polarization Controller EPC-2 of two-arm one makes the contrast of D3 ︰ D4 polarization feedback meet sets requirement after section beam splitter BS；
The electrical voltage point of Polarization Controller EPC-2 herein is locked, at this point, in the two-way after beam splitter BS, Polarization Controller
EPC-2, detector D3 and detector D4 are set to measurement P/N basic vector all the way.
4. the polarization feedback method of polarization encoder measuring device system without interaction as described in claim 1, it is characterised in that: adjust
The adjusting method of step 2 are as follows:
It controls the end Bob and sends out H laser；
Inquire the D1 ︰ D2 contrast of Charlie；
It controls the end Bob and sends out P laser；
Inquire the D3 ︰ D4 contrast of Charlie；
The contrast of comprehensive D1 ︰ D2 and D3 ︰ D4, judge whether the contrast meets target contrast requirement；If meeting
Terminate, otherwise first calculate the voltage compensation quantity of Polarization Controller EPC-B and issue, return again to step: " the control end Bob hair H swashs
Light " continues iteration.
5. the polarization feedback method of polarization encoder measuring device system without interaction as claimed in claim 2, it is characterised in that: adjust
The adjusting method of step 3 are as follows: enable the end Bob or the end Alice send H laser, P/N base after beam splitter BS is calibrated at the end Charlie
The Polarization Controller EPC-2 of arrow all the way, so that P/N basic vector state transformation is H/V basic vector state.
6. a kind of polarization feedback device of polarization encoder measuring device system without interaction, is used to calibrate the system automatically
The end Alice, the end Bob, the end Charlie make this three end while meeting base mistake unanimously；It is characterized by: the polarization feedback device packet
It includes:
Adjustment module one is used to adjust the end Alice and Charlie end group loses unanimously: after the beam splitter BS of the end Charlie
Two-way is respectively to swear consistent H/V basic vector and P/N basic vector measurement end with Alice end group；
Adjustment module two, the P/N base that is used to become estranged using the H/V base at the end Charlie of calibrated completion lose measurement end to adjust
The base at the end Bob loses, make the H/V base at the end Bob become estranged P/N base lose lost with the base at the end Alice, the end Charlie it is consistent.
7. the polarization feedback device of polarization encoder measuring device system without interaction as claimed in claim 6, it is characterised in that: described
Polarizing feedback device further includes adjustment module three, is used for the P/N base of the detector D3 at the end Charlie and detector D4 locking
Mistake reverts to the mistake of H/V base.
8. the polarization feedback device of polarization encoder measuring device system without interaction as claimed in claim 6, it is characterised in that: described
Adjustment module one includes:
Polarization Controller EPC-1 and its control driving unit；
Polarization Controller EPC-2 and its control driving unit；
H/V basic vector unit is used to that the end Alice to be made to send H polarization state laser first, passes through beam splitter BS at the end Charlie
1:1 enters detector D1, detector D2 and the detector D3 at the end Charlie, in detector D4, at this point, only focusing on detector D1
With the counting rate of detector D2, adjust beam splitter BS after two-arm one Polarization Controller EPC-1 make D1 ︰ D2 polarization feedback
Contrast meet sets requirement；
Lock cell one is used to lock the electrical voltage point of Polarization Controller EPC-1 herein, at this point, two after beam splitter BS
Lu Zhong, Polarization Controller EPC-1, detector D1 and detector D2 are set to measurement H/V basic vector all the way；
P/N basic vector unit is used to that the end Alice to be made to send P polarization state laser, passes through beam splitter BS 1:1 at the end Charlie
Into in the detector D1 at the end Charlie, detector D2 and detector D3, detector D4, detector D3 is only focused at this time and is visited
The counting rate of device D4 is surveyed, the Polarization Controller EPC-2 of two-arm one makes pair of D3 ︰ D4 polarization feedback after adjusting beam splitter BS
Meet sets requirement than degree；
Lock cell two is used to lock the electrical voltage point of Polarization Controller EPC-2 herein, at this point, two after beam splitter BS
Lu Zhong, Polarization Controller EPC-2, detector D3 and detector D4 are set to measurement P/N basic vector all the way.
9. the polarization feedback device of polarization encoder measuring device system without interaction as claimed in claim 6, it is characterised in that: described
Adjustment module two includes:
Polarization Controller EPC-B and its control driving unit；
H Laser control unit is used to control the end Bob hair H laser；
Query unit one is used to inquire the D1 ︰ D2 contrast of Charlie；P Laser control unit is used to control the end Bob hair
P laser；
Query unit two is used to inquire the D3 ︰ D4 contrast of Charlie；
Judging unit is used to integrate the contrast of D1 ︰ D2 and D3 ︰ D4, judges whether the contrast meets target contrast
It is required that；
Computing unit is used for when the contrast is unsatisfactory for target contrast requirement, first calculates Polarization Controller EPC-B's
Voltage compensation quantity simultaneously issues, and restarts H Laser control unit and continues iteration；And meet target contrast requirement in the contrast
When then terminate iteration.
10. a kind of polarization encoder measuring device system without interaction, polarization of the application as described in any one of claim 1 to 6
Feedback method；It is characterized by: the light that the end Alice of the system and the light source transmitting terminal at the end Bob are sent is respectively delivered to institute
Two input ports of the beam splitter BS at the end Charlie of system are stated, wherein the light source at the end Bob (or the end Alice) is sent
A Polarization Controller EPC-B is inserted between the respective input mouth of the beam splitter BS at end and the end Charlie；In light beam splitting
Behind two output ports of device BS in optical path, the output port one of beam splitter BS is connected by Polarization Controller EPC-1
Polarising beam splitter PBS1, then the two of polarising beam splitter PBS1 output end be separately connected the system detector D1 and
The output port two of D2, beam splitter BS are by Polarization Controller EPC-2 connection polarising beam splitter PBS2, and then polarised light divides
Two output ends of beam device PBS2 are separately connected the detector D3 and D4 of the system.
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