CN108989025A - Quantum key receiving end, discharge device and the method for promoting its interference efficiency - Google Patents
Quantum key receiving end, discharge device and the method for promoting its interference efficiency Download PDFInfo
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- CN108989025A CN108989025A CN201810730395.9A CN201810730395A CN108989025A CN 108989025 A CN108989025 A CN 108989025A CN 201810730395 A CN201810730395 A CN 201810730395A CN 108989025 A CN108989025 A CN 108989025A
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- interference fringes
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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
-
- 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
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/67—Optical arrangements in the receiver
- H04B10/676—Optical arrangements in the receiver for all-optical demodulation of the input optical signal
-
- 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
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/69—Electrical arrangements in the receiver
- H04B10/691—Arrangements for optimizing the photodetector in the receiver
-
- 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
- H04L9/0819—Key transport or distribution, i.e. key establishment techniques where one party creates or otherwise obtains a secret value, and securely transfers it to the other(s)
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- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Computer Security & Cryptography (AREA)
- Theoretical Computer Science (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The invention discloses a kind of quantum key receiving end, discharge device and the methods for promoting its interference efficiency, wherein quantum key receiving end includes: optical circulator, interferometer and photon detector；Interferometer includes the first interfere arm and the second interfere arm；Second interfere arm includes the second faraday mirror, retractable optical fiber and phase demodulator；The output end of photon detector connects retractable optical fiber through driving voltage controlling circuit；Driving voltage controlling circuit is used for the visibility of interference fringes of the output signal according to photon detector, controls the length of retractable optical fiber.Quantum key receiving end, discharge device and the method for promoting its interference efficiency provided in an embodiment of the present invention, by adding retractable optical fiber in the second interfere arm, the arm of two interfere arms in adjustment quantum key receiving end is poor in real time, so that the interfere arm arm difference in quantum key receiving end is consistent with the interfere arm arm difference in corresponding transmitting terminal.
Description
Technical field
The present invention relates to Technique on Quantum Communication fields, and in particular to a kind of quantum key receiving end, discharge device and promotion
The method of its interference efficiency.
Background technique
Quantum secret communication receives significant attention due to the characteristic with anti-eavesdrop and being theoretically perfectly safe.From modulation methods
The angle of formula says that quantum secret communication equipment can be divided into Polarization Modulation and phase-modulation, and applicable situation is different.Existing theoretical point
Analysis and test result show to be easy to be influenced to lead to the fast-changing occasion of polarization state (such as power grid system by external force in transmission line
The aerial optical cable being widely used in system), the quantum devices based on phase-modulation should be used as far as possible.In existing phase modulation schemes
In, F-M type interferes ring structure higher to the insensitive degree of polarization variations, and is easy the trick state BB84 association high with safety
View combines, thus is widely applied.Although F-M type structure has natural insensitivity to polarization state, it requires hair
Sending end interfere arm arm difference is equal with receiving end interfere arm arm difference, and otherwise interference efficiency will decline, and will be unable into code when serious.?
In practical application, transmitting terminal and receiving end will be placed in two completely self-contained environment, the difference of ambient temperature and vibration
Meeting is so that two end arms differences are not completely equivalent.Further, since the limitation of manufacture craft, sends end arms difference and is dispatching from the factory with end arms difference is received
When can also have fine difference.The pulse width of light-pulse generator employed in mainstream quantum key distribution equipment probably exists at present
10ps magnitude, for the laser of 1550nm wave band and standard single-mode fiber, the pulsewidth of 10ps means if F-M type is set
There are the difference of 1mm for standby transmission end arms difference and reception end arms difference, then should be in two light pulses that receiving end interferes
Just will be completely separable in time, it cannot achieve interference and at code.In predictable future, the working frequency of laser will
Higher and higher, pulse width will be more and more narrow, will be lower and lower to the tolerance of two end arms differences, this it could even be possible to
The principal element of rate is further increased as the following limitation high speed F-M type quantum key distribution equipment.Therefore, reduce transmitting terminal
And the arm difference of the interfere arm of receiving end, it is current urgent problem to be solved.
Summary of the invention
In view of this, the embodiment of the invention provides a kind of quantum key receiving end, discharge device and promoting its interference effect
The method of rate, to solve the problems, such as that the arm difference of interfere arm of quantum key transmitting terminal and receiving end has differences.
According in a first aspect, the embodiment of the invention provides a kind of quantum key receiving ends, comprising: optical circulator and institute
State the first end interferometer being connected of optical circulator and the photon detector being connected with the second end of the optical circulator, feature
Be: the interferometer includes the first interfere arm and the second interfere arm；First interfere arm connects the first of the optical circulator
End；Second interfere arm includes the second faraday mirror, retractable optical fiber and phase demodulator；Second faraday mirror connects described
One end of retractable optical fiber, one end of another termination phase demodulator of the retractable optical fiber, the phase demodulator it is another
The first end of the one termination optical circulator；The output end of the photon detector connects described flexible through driving voltage controlling circuit
Optical fiber；The driving voltage controlling circuit is used for the visibility of interference fringes of the output signal according to the photon detector, control
Make the length of the retractable optical fiber.
Quantum key receiving end provided in an embodiment of the present invention, by adding retractable optical fiber in the second interfere arm, and leads to
Overdrive voltage control circuit controls the length of retractable optical fiber according to the visibility of interference fringes of output signal, to adjust in real time
The arm of two interfere arms in quantum key receiving end is poor so that the interfere arm arm difference in quantum key receiving end with it is corresponding
Transmitting terminal in interfere arm arm difference be consistent, solve the interfere arm of quantum key transmitting terminal and receiving end in the prior art
Arm difference there are problems that fine difference.
With reference to first aspect, in first aspect first embodiment, the retractable optical fiber includes electrostrictor and twines
The optical fiber being wound on the electrostrictor；Two electrodes of the electrostrictor connect the defeated of the driving voltage controlling circuit
Outlet, and the length of the optical fiber is adjusted according to the driving voltage that the driving voltage controlling circuit exports.
Quantum key receiving end provided in an embodiment of the present invention constructs retractable optical fiber using electrostrictor and optical fiber, leads to
Crossing to power on to electrostrictor can make it that miniature deformation radially occur, to change the length of the optical fiber of coiling thereon, and light
The variation of fine length is directly proportional to the variation of the driving voltage on electrostrictor.It is connect in quantum key receiving end by control
The second interfere arm in electrostrictor driving voltage, can be realized the control to fiber lengths, and then it is close to control quantum
The arm of two interfere arms in key receiving end is poor.
With reference to first aspect, in first aspect second embodiment, first interfere arm includes the first faraday mirror,
The first end of the one termination optical circulator of first faraday mirror.
Quantum key receiving end provided in an embodiment of the present invention, by the way that the first faraday mirror is arranged in the first interfere arm,
Two interfere arms in quantum key receiving end are enabled smoothly to realize interference and demodulation to signal is received, thus guaranteed discharge
Sub-key receiving end work well.
According to second aspect, the embodiment of the invention provides a kind of quantum key distribution equipment, comprising: quantum key transmitting
End and the quantum key receiving end as described in any one of first aspect or first aspect embodiment.
Quantum key distribution equipment provided in an embodiment of the present invention, since the quantum including that can adjust interfere arm arm difference is close
Key receiving end so that transmitting terminal and receiving end in quantum key distribution equipment be made to keep interfere arm arm difference equal, and then overcomes
Objective factor bring adverse effect, is maintained at a higher level for the fringe visibility of receiving end always, promotes quantum
Cipher key distribution system at code rate, and be the high speed quantum key distribution system of the following picosecond even subpicosecond pulse that may be used
System carries out technological accumulation.
According to the third aspect, the embodiment of the invention provides a kind of method for promoting quantum key receiving end interference efficiency,
It include: that current visibility of interference fringes is obtained according to the output signal of photon detector；Judge that current interference fringe is visible
Whether degree reaches preset threshold；When current visibility of interference fringes is not up to preset threshold, electricity is controlled by driving voltage
Road adjusts the driving voltage on two electrodes of electrostrictor, until the visibility of interference fringes meets or exceeds default threshold
Value.
It is provided in an embodiment of the present invention promoted quantum key receiving end interference efficiency method, be with visibility of interference fringes
Foundation adjusts the driving voltage on electrostrictor by driving voltage controlling circuit, and then adjusts and be wrapped in electrostrictor
On optical fiber length, the interfere arm arm difference of quantum key receiving end is adjusted to realize, so that the interfere arm arm of receiving end
Difference and the interfere arm arm difference of transmitting terminal are consistent, and solve the interfere arm of quantum key transmitting terminal and receiving end in the prior art
The problem of arm difference has differences, improves interference efficiency.
In conjunction with the third aspect, in third aspect first embodiment, electroluminescent stretch is adjusted by driving voltage controlling circuit
Driving voltage on two electrodes of contracting body, until the visibility of interference fringes is not less than preset threshold, comprising: record is current
The first visibility of interference fringes, when the first fringe visibility be less than preset threshold when, according to preset step-length and predeterminated voltage tune
Section direction adjusts the driving voltage on two electrodes of the electrostrictor, and according to the corresponding output signal of photon detector
Obtain the second visibility of interference fringes after adjusting；According to first visibility of interference fringes and the second visibility of interference fringes
Size relation determine driving voltage adjust direction；Direction, which is adjusted, according to the driving voltage gradually adjusts the electrostrictor
Two electrodes on driving voltage, until visibility of interference fringes be not less than preset threshold.
The method provided in an embodiment of the present invention for promoting quantum key receiving end interference efficiency, it is first determined driving voltage tune
Direction is saved, direction is then adjusted according to driving voltage and gradually adjusts the driving voltage on electrostrictor, is twined to gradually adjust
It is wound on the length of the optical fiber on electrostrictor, so that the interfere arm arm difference of receiving end is gradually close to the interfere arm of transmitting terminal
The problem of arm is poor, declines to avoid interference efficiency caused by due to the interfere arm arm difference of transmitting terminal and receiving end is improved dry
Relate to efficiency.
In conjunction with third aspect first embodiment, in third aspect second embodiment, according to the first interference item
Line visibility and the size relation of the second visibility of interference fringes determine that driving voltage adjusts direction, comprising: judge described second
Whether visibility of interference fringes is greater than the first visibility of interference fringes；When second visibility of interference fringes is greater than the first interference
When fringe visibility, determining that predeterminated voltage adjusts direction is that the driving voltage adjusts direction.
The method provided in an embodiment of the present invention for promoting quantum key receiving end interference efficiency, is adjusted according to predeterminated voltage
Direction carries out after once adjusting the driving voltage of electrostrictor, and two interference fringes by comparing adjustment front and back are visible
Degree determines that driving voltage adjusts direction, can conveniently and efficiently determine that driving voltage adjusts direction.
In conjunction with third aspect second embodiment, in third aspect third embodiment, when second interference fringe
When visibility is not more than the first visibility of interference fringes, the opposite direction for determining that predeterminated voltage adjusts direction is the driving voltage tune
Save direction.
It is provided in an embodiment of the present invention promoted quantum key receiving end interference efficiency method, visibility of interference fringes because
It is directly that driving voltage adjusts direction, energy by the opposite direction that predeterminated voltage adjusts direction when driving voltage declines after adjusting
It is enough conveniently and efficiently to determine that driving voltage adjusts direction.
According to fourth aspect, the embodiment of the invention provides a kind of device for promoting quantum key receiving end interference efficiency,
It include: visibility of interference fringes acquiring unit, obtaining current interference fringe for the output signal according to photon detector can
Degree of opinion；Judging unit, for judging whether current visibility of interference fringes reaches preset threshold；Pressure regulation unit, for working as
When preceding visibility of interference fringes is not up to preset threshold, two electricity of electrostrictor are adjusted by driving voltage controlling circuit
Driving voltage on extremely, until the visibility of interference fringes meets or exceeds preset threshold.
According to the 5th aspect, the embodiment of the invention provides a kind of electronic equipment, comprising: memory and processor, it is described
Connection is communicated with each other between memory and the processor, computer instruction is stored in the memory, and the processor is logical
It crosses and executes the computer instruction, thereby executing as described in any one of first aspect or first aspect embodiment
Promote quantum key receiving end interference efficiency method.
Detailed description of the invention
The features and advantages of the present invention will be more clearly understood by referring to the accompanying drawings, and attached drawing is schematically without that should manage
Solution is carries out any restrictions to the present invention, in the accompanying drawings:
Fig. 1 shows the structural representation of a specific example of one of embodiment of the present invention quantum key receiving end
Figure；
Fig. 2 shows the structural schematic diagrams of a specific example of the retractable optical fiber in the embodiment of the present invention；
Fig. 3 shows the structural representation of a specific example of one of embodiment of the present invention quantum key distribution equipment
Figure；
Fig. 4 shows the tool that one of embodiment of the present invention promotes the method for quantum key receiving end interference efficiency
The exemplary flow chart of body；
Fig. 5 shows one of embodiment of the present invention and promotes realization step in the method for quantum key receiving end interference efficiency
The flow chart of a specific example of rapid S103；
Fig. 6 shows the tool that one of embodiment of the present invention promotes the device of quantum key receiving end interference efficiency
The exemplary structural schematic diagram of body；
Fig. 7 shows the structural schematic diagram of a specific example of one of embodiment of the present invention electronic equipment.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those skilled in the art are not having
Every other embodiment obtained under the premise of creative work is made, shall fall within the protection scope of the present invention.
The embodiment of the invention provides a kind of quantum key receiving ends, as shown in Figure 1, the quantum key receiving end can wrap
It includes: optical circulator 11, interferometer 12, driving voltage controlling circuit 13 and photon detector 14.
Wherein, interferometer 12 is connected with the first end of optical circulator 11.Interferometer 12 includes that the first interfere arm and second are dry
Relate to arm 122.First interfere arm connects the first end of optical circulator 11, and in a specific embodiment, the first interfere arm is by the first method
Mirror FM1 and telecommunication optical fiber is drawn to form, one end of the first faraday mirror FM1 connects the first end of optical circulator 11 through obturator optical fiber.
Second interfere arm 122 includes the second faraday mirror FM2, retractable optical fiber 1222 and phase demodulator PM1.Second farad
Mirror FM2 connects one end of retractable optical fiber 1222, one end of another termination phase demodulator PM1 of retractable optical fiber 1222, phase solution
Adjust the first end of another termination optical circulator 11 of device PM1.
The output input of photon detector 14 connects the second end of optical circulator 11, and the output end of photon detector 14 is through driving
Dynamic voltage control circuit 13 connects retractable optical fiber 1222.Output of the driving voltage controlling circuit 12 for photon detector 14 described in root
The visibility of interference fringes of signal controls the length of retractable optical fiber 1222.In a specific embodiment, as shown in Fig. 2, it is flexible
Optical fiber 1222 includes electrostrictor 1222A and the optical fiber 1222B being wrapped on electrostrictor 1222A.Electrostrictor
Two electrodes of 1222A connect the output end of driving voltage controlling circuit 13, and the drive exported according to driving voltage controlling circuit 13
Dynamic voltage adjusts the length of optical fiber.The retractable optical fiber 1222 constructed using electrostrictor 1222A and optical fiber 1222B, by giving
Electrostrictor 1222A, which is powered on, can make it that miniature deformation radially occur, thus change the length of the optical fiber 1222B of coiling thereon,
And the variation of optical fiber 1222B length is directly proportional to the variation of driving voltage on electrostrictor 1222A.In a specific implementation
In mode, retractable optical fiber 1222 can be piezoelectric ceramic type fiber stretcher, in piezoelectric ceramic type fiber stretcher, multilayer optical
Fibre is compact to be coiled on one piece of electrostriction material, and powering on to the material can make its that miniature deformation radially occur, to change disk
Around fiber lengths thereon, and the variation of fiber lengths is directly proportional to the variation of driving voltage.Retractable optical fiber 1222 usually has
There are high-performance, low cost, the small and exquisite firm advantage of encapsulation, the representative value of electrostriction effect is 1.3 μm/V (fiber-draw
Degree may customize) or 0.0065ps/V (the light delay in standard single-mode fiber, may customize), insertion loss 0.2dB, driving electricity
Range ± 400V is pressed, bandwidth is adjusted up to 300Hz, can satisfy current 10 picosecond magnitude or even from now on subpicosecond magnitude completely
High-speed, high precision compensation.
Quantum key receiving end provided in an embodiment of the present invention, by adding retractable optical fiber in the second interfere arm, and leads to
Overdrive voltage control circuit controls the length of retractable optical fiber according to the visibility of interference fringes of output signal.To adjust in real time
The arm of two interfere arms in quantum key receiving end is poor so that the interfere arm arm difference in quantum key receiving end with it is corresponding
Transmitting terminal in interfere arm arm difference be consistent, solve the interfere arm of quantum key transmitting terminal and receiving end in the prior art
Arm difference the problem of having differences.
The embodiment of the invention also provides a kind of quantum key distribution equipment, as shown in figure 3, the quantum key distribution equipment
It may include quantum key transmitting terminal 2 and above-mentioned quantum key receiving end 1.
In Fig. 3, A end of the pulse through the first optical circulator 21 in quantum key transmitting terminal 2 of the sending of light-pulse generator 3
Mouth input, becoming dipulse after the output of the port B, (pulse n and pulse m), dipulse respectively enter two interference of Length discrepancy
Arm, wherein all the way by phase-modulator PM1 load signal (phase signal load might as well be set on pulse m), by the 4th
The port B is returned to after Ferrari mirror FM4 reflection, another way returns to the port B after third Ferrari mirror FM3 reflection.Dipulse at this time
It will separate in time, the arm that the time interval between dipulse depends on two interfere arms is poor, and third Ferrari mirror FM3
And the 4th the characteristic of Ferrari mirror FM4 itself can guarantee that dipulse is polarized when being reflected back the port B and be consistent, polarization and arm
Long difference and specific path are unrelated；Quantum key receiving end 1 is reached after transmitting by long optical fibers, the polarization state of dipulse is still at this time
It is consistent, it is unrelated with specific path.Similarly, dipulse enter the interfere arms of two unequal arms of quantum key receiving end 1 into
Row time delay, through when delay dipulse and will become four pulses (pulse n1, pulse n2, pulse m1 and pulse m2), wherein pulse n2 contains
There is modulation intelligence, pulse m1 contains demodulating information.Obviously, if the interfere arm difference of quantum key receiving end 1 and quantum key are sent out
The interfere arm difference for penetrating end 2 is identical, then pulse n2 and pulse m1 is completely coincident in time, and four pulses are eventually entering into photon
Perfect " output of three peaks " will be formed before detector 14 to do at this time wherein the phase information contained can sufficiently interact
Efficiency highest is related to, fringe visibility is clearest.And the really not so perfection of actual conditions, it always has various undesirable factors and makes
The arm difference of quantum key transmitting terminal 2 and quantum key receiving end 1 is not completely equivalent, and does not lead to pulse n2 and pulse m1 in time not
It can be completely coincident, be formed faulty " output of four peaks ", so that interference efficiency declines, fringe visibility is lower, influences to post-process
And finally at code.
For first generation quantum key distribution equipment, the lower (representative value of pulse laser repetition rate that uses
For 40MHz), generated pulse width is also wider (generally ns~10ns magnitude), therefore does in transmitting terminal and receiving end
Relate to the above-mentioned difference of arm and insensitive.But with the development of Quantum Secure Communication, how in long-distance optical fiber channel condition
Lower promotion quantum key safety is increasingly becoming bottleneck at code rate.At present apparently, in addition to reducing the fibre loss of unit length, using
Except more efficient mutation agreement and post-processing algorithm, the method for most simple possible is exactly to improve the working frequency of laser.With
The working frequency of laser improve, pulse width narrows, will get over to the tolerance of arm difference in transmitting terminal and receiving end
Come it is lower, therefore, it is necessary to take steps to compensation transmit and receive both ends interfere arm arm difference fine difference, reduction equipment to temperature
The sensibility of the extraneous factors such as degree, vibration, remains at a higher level for interference efficiency (fringe visibility), thus directly
Connect promoted quantum key distribution equipment at code rate and stability, and to be following further using higher working frequency and narrower
Pulse pave the way.
Quantum key distribution equipment provided in an embodiment of the present invention increases active time bias in quantum key receiving end 1
Structure specifically increases driving voltage controlling circuit 13 after photon detector 14, and in quantum key receiving end 1
Increase retractable optical fiber 1222 in second interfere arm 122, be located at the retractable optical fiber 1222 in the interfere arm of receiving end for closed-loop control,
The length of retractable optical fiber 1222 is adjusted to guarantee that receiving end interfere arm difference is equal with the poor moment holding of transmitting terminal interfere arm.
Quantum key distribution equipment provided in an embodiment of the present invention, since the quantum including that can adjust interfere arm arm difference is close
Key receiving end so that transmitting terminal and receiving end in quantum key distribution equipment be made to keep interfere arm arm difference equal, and then overcomes
Objective factor bring adverse effect, is maintained at a higher level for the fringe visibility of receiving end always, promotes quantum
Cipher key distribution system at code rate, and be the high speed quantum key distribution system of the following picosecond even subpicosecond pulse that may be used
System carries out technological accumulation.
The embodiment of the invention also provides a kind of methods for promoting quantum key receiving end interference efficiency, as shown in figure 4, should
Method may comprise steps of:
Step S101: current visibility of interference fringes is obtained according to the output signal of photon detector.It is specific real one
It applies in mode, the signal that can be exported by the photon detector 14 in quantum key receiving end obtains current interference in real time
Fringe visibility just can prove that current interference efficiency can satisfy requirement only when visibility of interference fringes reaches requirement,
It could be finally at code when the output signal of photon detector 14 passes through subsequent processing.
Step S102: judge whether current visibility of interference fringes reaches preset threshold.When current interference fringe can
When degree of opinion is not up to preset threshold, step S103 is executed；When current visibility of interference fringes reaches preset threshold, do not execute
Any operation.
Step S103: the driving voltage on two electrodes of electrostrictor is adjusted by driving voltage controlling circuit, directly
Preset threshold is met or exceeded to visibility of interference fringes.It in a specific embodiment, as shown in figure 5, can be by following
Several sub-steps realize that step S103 adjusts the driving electricity on two electrodes of electrostrictor by driving voltage controlling circuit
Pressure, until visibility of interference fringes meets or exceeds the process of preset threshold:
Step S1031: direction is adjusted according to preset step-length and predeterminated voltage and is adjusted on two electrodes of electrostrictor
Driving voltage, and the second visibility of interference fringes after adjusting is obtained according to the corresponding output signal of photon detector.It is adjusting
Before driving voltage, the first current visibility of interference fringes can recorde first, when the first fringe visibility is less than default threshold
When value, then start to adjust driving voltage.
Step S1032: the size relation according to first visibility of interference fringes and the second visibility of interference fringes is true
Determine driving voltage and adjusts direction.When determining that driving voltage adjusts direction, it can first determine whether that the second visibility of interference fringes is
It is no to be greater than the first visibility of interference fringes；When the second visibility of interference fringes is greater than the first visibility of interference fringes, determine pre-
If it is that driving voltage adjusts direction that voltage, which adjusts direction,；When the second visibility of interference fringes is not more than the first visibility of interference fringes
When, the opposite direction for determining that predeterminated voltage adjusts direction is that driving voltage adjusts direction.
Step S1033: direction is adjusted according to driving voltage and gradually adjusts the electricity of the driving on two electrodes of electrostrictor
Pressure.In a specific embodiment, the adjusting step-length of driving voltage can be preset, the driving voltage each time was adjusted
Cheng Zhong increases or reduces driving voltage according to preset adjusting step-length, after adjusting driving voltage every time, is performed both by
Step S1034.
Step S1034: judge whether visibility of interference fringes reaches preset threshold.When visibility of interference fringes is not up to pre-
If when threshold value, return step S1033；When visibility of interference fringes reaches preset threshold, terminate.
It is provided in an embodiment of the present invention promoted quantum key receiving end interference efficiency method, be with visibility of interference fringes
Foundation adjusts the driving voltage on electrostrictor by driving voltage controlling circuit, and then adjusts and be wrapped in electrostrictor
On optical fiber length, the interfere arm arm difference of quantum key receiving end is adjusted to realize, so that the interfere arm arm of receiving end
Difference and the interfere arm arm difference of transmitting terminal are consistent, and solve the interfere arm of quantum key transmitting terminal and receiving end in the prior art
The problem of arm difference has differences, improves interference efficiency.
The embodiment of the invention also provides a kind of devices for promoting quantum key receiving end interference efficiency, as shown in fig. 6, should
Device may include: visibility of interference fringes acquiring unit 601, judging unit 602 and pressure regulation unit 603.
Wherein, visibility of interference fringes acquiring unit 601 is used to be obtained currently according to the output signal of photon detector
Visibility of interference fringes；Detailed content is with reference to described in step S101.
Judging unit, for judging whether current visibility of interference fringes reaches preset threshold；Detailed content is with reference to step
Described in rapid S102.
Pressure regulation unit, when current visibility of interference fringes is not up to preset threshold, for being controlled by driving voltage
Circuit adjusts the driving voltage on two electrodes of electrostrictor, until visibility of interference fringes reaches preset threshold, in detail
Content is with reference to described in step S103.
The embodiment of the invention also provides a kind of electronic equipment, as shown in fig. 7, the electronic equipment may include processor
701 and memory 702, wherein processor 701 can be connected with memory 702 by bus or other modes, with logical in Fig. 7
It crosses for bus connection.
Processor 701 can be central processing unit (Central Processing Unit, CPU).Processor 701 may be used also
Think other general processors, digital signal processor (Digital Signal Processor, DSP), specific integrated circuit
(Application Specific Integrated Circuit, ASIC), field programmable gate array (Field-
Programmable GateArray, FPGA) either other programmable logic device, discrete gate or transistor logic,
The combination of the chips such as discrete hardware components or above-mentioned all kinds of chips.
Memory 702 is used as a kind of non-transient computer readable storage medium, can be used for storing non-transient software program, non-
Transient computer executable program and module, such as the side of the promotion quantum key receiving end interference efficiency in the embodiment of the present invention
Corresponding program instruction/the module of method is (for example, visibility of interference fringes acquiring unit 601 shown in fig. 6, judging unit 602 and tune
Press unit 603).Non-transient software program, instruction and the module that processor 701 is stored in memory 702 by operation, from
And executing the various function application and data processing of processor, i.e., the promotion quantum key in realization above method embodiment connects
The method of receiving end interference efficiency.
Memory 702 may include storing program area and storage data area, wherein storing program area can store operation system
Application program required for system, at least one function；It storage data area can the data etc. that are created of storage processor 701.In addition,
Memory 702 may include high-speed random access memory, can also include non-transient memory, and a for example, at least disk is deposited
Memory device, flush memory device or other non-transient solid-state memories.In some embodiments, it includes opposite that memory 702 is optional
In the remotely located memory of processor 701, these remote memories can pass through network connection to processor 701.Above-mentioned net
The example of network includes but is not limited to internet, intranet, local area network, mobile radio communication and combinations thereof.
One or more of modules are stored in the memory 702, when being executed by the processor 701, are held
The method of promotion quantum key receiving end interference efficiency in capable embodiment as illustrated in figures 4-5.
Above-mentioned electronic equipment detail can correspond to refering to Fig. 4 into embodiment shown in fig. 5 corresponding associated description
Understood with effect, details are not described herein again.
It is that can lead to it will be understood by those skilled in the art that realizing all or part of the process in above-described embodiment method
Computer program is crossed to instruct relevant hardware and complete, the program can be stored in a computer-readable storage medium
In, the program is when being executed, it may include such as the process of the embodiment of above-mentioned each method.Wherein, the storage medium can for magnetic disk,
CD, read-only memory (Read-Only Memory, ROM), random access memory (RandomAccess Memory,
RAM), flash memory (Flash Memory), hard disk (Hard Disk Drive, abbreviation: HDD) or solid state hard disk (Solid-
State Drive, SSD) etc.；The storage medium can also include the combination of the memory of mentioned kind.
Although being described in conjunction with the accompanying the embodiment of the present invention, those skilled in the art can not depart from the present invention
Spirit and scope in the case where various modifications and variations can be made, such modifications and variations are each fallen within by appended claims institute
Within the scope of restriction.
Claims (10)
1. a kind of quantum key receiving end, including optical circulator, the interferometer being connected with the first end of the optical circulator and with
The connected photon detector of the second end of the optical circulator, it is characterised in that:
The interferometer includes the first interfere arm and the second interfere arm；
First interfere arm connects the first end of the optical circulator；Second interfere arm includes the second faraday mirror, stretches
Optical fiber and phase demodulator；Second faraday mirror connects one end of the retractable optical fiber, another termination of the retractable optical fiber
One end of the phase demodulator, the first end of another termination optical circulator of the phase demodulator；
The output end of the photon detector connects the retractable optical fiber through driving voltage controlling circuit；
The driving voltage controlling circuit is used for the visibility of interference fringes of the output signal according to the photon detector, control
The length of the retractable optical fiber.
2. quantum key receiving end according to claim 1, it is characterised in that:
The retractable optical fiber includes electrostrictor and the optical fiber that is wrapped on the electrostrictor；
Two electrodes of the electrostrictor connect the output end of the driving voltage controlling circuit, and according to the driving voltage
The driving voltage of control circuit output adjusts the length of the optical fiber.
3. quantum key receiving end according to claim 1, it is characterised in that:
First interfere arm includes the first faraday mirror, and the one of first faraday mirror terminates the first of the optical circulator
End.
4. a kind of quantum key distribution equipment, which is characterized in that including any in quantum key transmitting terminal and such as claim 1-3
Quantum key receiving end described in.
5. a kind of method for promoting quantum key receiving end interference efficiency characterized by comprising
Current visibility of interference fringes is obtained according to the output signal of photon detector；
Judge whether current visibility of interference fringes reaches preset threshold；
When current visibility of interference fringes is not up to preset threshold, electrostrictor is adjusted by driving voltage controlling circuit
Two electrodes on driving voltage, until the visibility of interference fringes meets or exceeds preset threshold.
6. the method according to claim 5 for promoting quantum key receiving end interference efficiency, which is characterized in that pass through driving
Voltage control circuit adjusts the driving voltage on two electrodes of electrostrictor, until the visibility of interference fringes is not less than
Preset threshold, comprising:
The first current visibility of interference fringes of record, when the first fringe visibility is less than preset threshold, according to preset step-length
And predeterminated voltage adjusts direction and adjusts the driving voltage on two electrodes of the electrostrictor, and according to photon detector pair
The output signal answered obtains the second visibility of interference fringes after adjusting；
Determine that driving voltage is adjusted according to the size relation of first visibility of interference fringes and the second visibility of interference fringes
Direction；
Direction, which is adjusted, according to the driving voltage gradually adjusts the driving voltage on two electrodes of the electrostrictor, until
Visibility of interference fringes is not less than preset threshold.
7. the method according to claim 6 for promoting quantum key receiving end interference efficiency, which is characterized in that according to described
The size relation of first visibility of interference fringes and the second visibility of interference fringes determines that driving voltage adjusts direction, comprising:
Judge whether second visibility of interference fringes is greater than the first visibility of interference fringes；
When second visibility of interference fringes is greater than the first visibility of interference fringes, determining that predeterminated voltage adjusts direction is institute
It states driving voltage and adjusts direction.
8. the method according to claim 7 for promoting quantum key receiving end interference efficiency, it is characterised in that:
When second visibility of interference fringes is not more than the first visibility of interference fringes, determine that predeterminated voltage adjusts direction
Opposite direction is that the driving voltage adjusts direction.
9. a kind of device for promoting quantum key receiving end interference efficiency characterized by comprising
It is visible to obtain current interference fringe for the output signal according to photon detector for visibility of interference fringes acquiring unit
Degree；
Judging unit, for judging whether current visibility of interference fringes reaches preset threshold；
Pressure regulation unit, for passing through driving voltage controlling circuit when current visibility of interference fringes is not up to preset threshold
The driving voltage on two electrodes of electrostrictor is adjusted, until the visibility of interference fringes meets or exceeds default threshold
Value.
10. a kind of electronic equipment characterized by comprising
Memory and processor communicate with each other connection, are stored in the memory between the memory and the processor
Computer instruction, the processor is by executing the computer instruction, thereby executing as described in any one of claim 5-9
Promotion quantum key receiving end interference efficiency method.
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