CN107437966A - Both ends polarization state initial method based on phase-modulated polarized state coding QKD system - Google Patents
Both ends polarization state initial method based on phase-modulated polarized state coding QKD system Download PDFInfo
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- CN107437966A CN107437966A CN201710669124.2A CN201710669124A CN107437966A CN 107437966 A CN107437966 A CN 107437966A CN 201710669124 A CN201710669124 A CN 201710669124A CN 107437966 A CN107437966 A CN 107437966A
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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
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2589—Bidirectional transmission
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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
- H04B10/27—Arrangements for networking
- H04B10/275—Ring-type networks
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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
- H04B10/548—Phase or frequency modulation
- H04B10/556—Digital modulation, e.g. differential phase shift keying [DPSK] or frequency shift keying [FSK]
- H04B10/5561—Digital phase 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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Abstract
The invention discloses a kind of both ends polarization state initial method based on phase-modulated polarized state coding QKD system, including：The voltage of second phase modulator is fixed as 0, and the phase of first phase modulator constantly changes the polarization state of light from 0 to 2 π searching loops, the first Polarization Controller, until the count value in the first single-photon detector and the second single-photon detector keeps constant；The voltage of first phase modulator is fixed as 0, and the phase of second phase modulator constantly changes the polarization state of light from 0 to 2 π searching loops, the second Polarization Controller, until the count value in the first single-photon detector and the second single-photon detector keeps constant；The voltage of first phase modulator and the voltage of second phase modulator are fixed as 0, and the 3rd Polarization Controller constantly changes the polarization state of light, until the second single-photon detector count value reaches maximum；The present invention realizes the coordinate alignment of the quick polarization state in system both ends, and ensures system self-recovery and stability.
Description
Technical field
The present invention relates to phase-modulated polarized state coding QKD system field, and in particular to one kind is based on phase-modulated polarized
State encodes the both ends polarization state initial method of QKD system.
Background technology
The quantum key dispatching system of phase-modulated polarized coding（QKD）Respectively in connection with the sum of phase code QKD system
The advantage of polarization encoder QKD system, there are good application scenarios.And the phase-modulated polarized coding same polarization encoder of QKD system
QKD system is identical, needs to carry out initialization operation before carrying out quantum-key distribution, i.e., by transmitting terminal and the light coordinate axle of receiving terminal
Alignment, because ensureing that the polarization state of light is identical with the measurement state of receiving terminal coordinate system in transmitting terminal coordinate system.
The QKD system of a phase-modulated polarized coding typically only quantum radiant, the realization of its polarization state is to utilize
The phase-modulator of system realizes the modulation of each polarization state, that is, modulates different phases and different polarization states can be achieved.Into
The stability of the polarization state of the light of phase-modulator needs to ensure, usually with measurement apparatus that the measuring polarization state of light is good, it
The stabilization of polarization state is realized in transmission with polarization maintaining optical fibre afterwards, even there is polarization maintaining optical fibre in actual use, and the polarization state of light also has
Change, it is necessary to remeasure, demarcation.The method is unable to stability and the flexibility of matching system, and additional measurement apparatus, increase
The complexity and cost of system.How using each device in the QKD system of phase-modulated polarized coding both ends polarization state is realized
Initialization operation and do not need additional measurement apparatus, the problem of being current urgent need to resolve.
The content of the invention
The technical problems to be solved by the invention are to provide one kind for above-mentioned the deficiencies in the prior art to be based on phase-modulation
Polarization state encodes the both ends polarization state initial method of QKD system, and the both ends of QKD system are encoded based on phase-modulated polarized state
Polarization state initial method realizes the coordinate alignment of the quick polarization state in system both ends, and has cast out the fiber crops of additional measurement apparatus
It is tired, and the alignment of both ends light coordinate axle according to influence of the environment to system, can be carried out in real time, ensure system self-reparability and
Stability.
To realize above-mentioned technical purpose, the technical scheme that the present invention takes is：
A kind of both ends polarization state initial method based on phase-modulated polarized state coding QKD system, including it is phase-modulated polarized
State encodes QKD system, and the phase-modulated polarized state coding QKD system includes transmitting terminal, receiving terminal and host computer, the reception
End connected by fiber channel with receiving terminal, the transmitting terminal and receiving terminal with upper mechatronics；The transmitting terminal includes
Laser, the first Polarization Controller, first annular device, the first polarization beam apparatus, first phase modulator, attenuator and the first control
Circuit processed, the receiving terminal include the second Polarization Controller, the second circulator, the second polarization beam apparatus, second phase modulator,
3rd Polarization Controller, the 3rd polarization beam apparatus, the first single-photon detector, the second single-photon detector and the second control electricity
Road, specifically include following steps：
Step 1：The voltage of second phase modulator is fixed as 0, host computer is modulated by first control circuit to first phase
Device sends control instruction, and the voltage of first phase modulator is from minimum value to maximum searching loop, i.e. first phase modulator
Phase from 0 to 2 π searching loops, meanwhile, host computer sends control instruction by first control circuit to the first Polarization Controller
So that the first Polarization Controller constantly changes the polarization state of light, when in the first single-photon detector and the second single-photon detector
Count value when remaining constant, the first Polarization Controller stops changing the polarization state of light；
Step 2：The voltage of first phase modulator is fixed as 0, host computer is modulated by second control circuit to second phase
Device sends control instruction, and the voltage of second phase modulator is from minimum value to maximum searching loop, i.e. second phase modulator
Phase from 0 to 2 π searching loops, meanwhile, host computer sends control instruction by second control circuit to the second Polarization Controller
So that the second Polarization Controller constantly changes the polarization state of light, when in the first single-photon detector and the second single-photon detector
Count value when remaining constant, the second Polarization Controller stops changing the polarization state of light；
Step 3：The voltage of the voltage of first phase modulator and second phase modulator is fixed as 0, host computer passes through
Two control circuits send control instruction to the 3rd Polarization Controller so that the 3rd Polarization Controller constantly changes the polarization state of light,
When the count value of the first single-photon detector reaches minimum value, when the count value of the second single-photon detector reaches maximum,
3rd Polarization Controller stops changing the polarization state of light；
Step 4:Host computer sends control instruction so that first is inclined again by first control circuit to the first Polarization Controller
The controller that shakes constantly changes the polarization state of light, when the count value in the first single-photon detector and the second single-photon detector is equal
When, the first Polarization Controller stops changing the polarization state of light；
Step 5：Host computer sends control instruction so that the 3rd is inclined again by second control circuit to the 3rd Polarization Controller
The controller that shakes constantly changes the polarization state of light, when the count value of the first single-photon detector reaches minimum value, the second single photon
When the count value of detector reaches maximum, the 3rd Polarization Controller stops changing the polarization state of light, and phase-modulated polarized state is compiled
The polarization state initialization of the receiving terminal and transmitting terminal of code QKD system is completed.
As further improved technical scheme of the present invention, the host computer electrically connects with first control circuit, and described
One control circuit electrically connects with laser, the first Polarization Controller and first phase modulator respectively, first polarization beam splitting
Device is connected so as to form transmitting terminal sagnac rings with first phase modulator by two polarization maintaining optical fibres；The laser is used to produce
Raw pulsed light, first Polarization Controller are used for the polarization state for changing light and light are incided into first annular device, and described first
Polarization beam apparatus is used to the incident polarised light of first annular device being divided into horizontal polarization light and orthogonal polarized light, first phase
Position modulator is used for the phase for modulating polarised light clockwise or counterclockwise direction, and first polarization beam apparatus is used in the future
Attenuator is emitted to from horizontal polarization light and orthogonal polarized light the remittance first annular device of merga pass of first phase modulator, is decayed
Device passes through fibre channel transmission to receiving terminal with then decay light intensity and the light sent.
As further improved technical scheme of the present invention, the host computer electrically connects with second control circuit, and described
Two control circuits respectively with the second Polarization Controller, the 3rd Polarization Controller, second phase modulator, the first single-photon detector
Electrically connected with the second single-photon detector, second polarization beam apparatus and second phase modulator are connected by two polarization maintaining optical fibres
Connect so as to form receiving terminal sagnac rings；Second Polarization Controller is used to change the polarization state of light and light is incided into second
Circulator, second polarization beam apparatus are used to the incident polarised light of the second circulator being divided into horizontal polarization light and vertical polarization
Light, the second phase modulator are used for the phase for modulating polarised light clockwise or counterclockwise direction, second polarization
Beam splitter is used to horizontal polarization light and orthogonal polarized light the remittance circulator of merga pass second from second phase modulator
The 3rd Polarization Controller is mapped to, the 3rd Polarization Controller is used to change the polarization state of light and light is incided into the 3rd polarization beam splitting
Device, the 3rd polarization beam apparatus are used to the polarised light of incidence being divided into horizontal polarization light and orthogonal polarized light, first single photon
Detector is used for the polarised light for detecting horizontal state of polarization, and the second single-photon detector is used for the polarised light for detecting perpendicular polarisation state.
It is inclined that the present invention utilizes the related device of the QKD system of phase-modulated polarized coding to realize the quick light in system both ends
The coordinate alignment of polarization state, and has cast out the trouble of additional measurement apparatus, cost-effective, and can be according to environment to system shadow
Ring, carry out the alignment of both ends light coordinate axle in real time, ensure the self-reparability and stability of system.
Brief description of the drawings
Fig. 1 is that the phase-modulated polarized state of the present invention encodes the structural representation of QKD system.
Fig. 2 is the curve synoptic diagram for the corresponding relation that the phase of the present invention and polarization state count.
Fig. 3 is the operational flowchart of the present invention.
Embodiment
The specific embodiment of the present invention is made below according to Fig. 1 to Fig. 3 and being illustrated:
There are three adjustable Polarization Controllers in phase-modulated polarized state coding QKD system based on sagnac rings, act on
It is respectively：First Polarization Controller is to ensure that the light into Sagnac rings is 45 ° of polarization state incidences, and the second Polarization Controller is to protect
For card into 45 ° of polarization state incidences of light of the Sagnac rings of receiving terminal, the 3rd Polarization Controller is to ensure to enter two single photon detections
The stability of 45 ° of polarization states of incidence of device light.How the initialization operation of both ends polarization state is realized using each device in system,
The problem of being the urgent need to resolve of the present invention.
Referring to Fig. 1, a kind of phase-modulated polarized state coding QKD system, including transmitting terminal, receiving terminal and host computer, it is described
Receiving terminal is connected by fiber channel with receiving terminal, the transmitting terminal and receiving terminal with upper mechatronics.
The transmitting terminal includes laser, the first Polarization Controller, first annular device, the first polarization beam apparatus, the first phase
Position modulator, attenuator and first control circuit, the host computer electrically connect with first control circuit, the first control circuit
Electrically connected respectively with laser, the first Polarization Controller and first phase modulator, first polarization beam apparatus and the first phase
Position modulator passes through two polarization maintaining optical fibres（That is the light path 1 and light path 2 of transmitting terminal）Connect so as to form transmitting terminal sagnac rings；Institute
State laser to be used to produce pulsed light, first Polarization Controller is used to pulsed light being turned into 0 ° of linearly polarized light or 45 ° of lines
Polarised light simultaneously incides first annular device, and first polarization beam apparatus is used to the incident polarised light of first annular device being divided into water
Flat polarised light and orthogonal polarized light, the first phase modulator are used to modulate polarised light clockwise or counterclockwise direction
Phase, first polarization beam apparatus be used for horizontal polarization light and orthogonal polarized light from first phase modulator are converged
And attenuator is emitted to by first annular device, attenuator is with then decaying light intensity and the light that is sent passes through and crosses fiber channel
It is transferred to receiving terminal.
The receiving terminal includes the second Polarization Controller, the second circulator, the second polarization beam apparatus, second phase modulation
Device, the 3rd Polarization Controller, the 3rd polarization beam apparatus, the first single-photon detector, the second single-photon detector and the second control
Circuit, the host computer electrically connect with second control circuit, the second control circuit respectively with the second Polarization Controller, the 3rd
Polarization Controller, second phase modulator, the first single-photon detector and the electrical connection of the second single-photon detector, described second is inclined
Shake beam splitter and second phase modulator passes through two polarization maintaining optical fibres（That is the light path 1 and light path 2 of receiving terminal）Connect so as to form
Receiving terminal sagnac rings；Second Polarization Controller is used to change the polarization state of light and light is incided into the second circulator, institute
State the second polarization beam apparatus to be used to the incident polarised light of the second circulator being divided into horizontal polarization light and orthogonal polarized light, described the
Two phase modulator is used for the phase for modulating polarised light clockwise or counterclockwise direction, and second polarization beam apparatus is used for
It is inclined that horizontal polarization light and orthogonal polarized light the remittance circulator of merga pass second from second phase modulator is emitted to the 3rd
Shake controller, and the 3rd Polarization Controller is used for the polarization state for changing light and light is incided into the 3rd polarization beam apparatus, the 3rd polarization
Beam splitter is used to the polarised light of incidence being divided into horizontal polarization light and orthogonal polarized light, first single-photon detector and
Second single-photon detector is respectively used to detect the polarised light of horizontal state of polarization and the polarised light of perpendicular polarisation state.
Solid arrow in Fig. 1 is optic path direction, and dotted arrow is automatically controlled signal, and a branch of quantum light is inclined by first
Shake and enter the first polarization beam apparatus after controller and first annular device, now quantum light is divided into polarization state by the first polarization beam apparatus
Orthogonal two-way light, propagated respectively along the light path 1 in Fig. 1 and light path 2, and the path of light path 2 is longer than light path 1, two-beam edge
Opposite direction passes through first phase modulator, but passes through circuit design, and the light path 1 in the present embodiment only along transmitting terminal is propagated
Pulsed light upper corresponding phase is adjusted by first phase modulator, what the pulsed light that the light path 2 of transmitting terminal is propagated added all the time is
Stationary phase, two-beam reach the first polarization beam apparatus multiplex by same paths opposite direction and adjusted into phase information simultaneously
The polarization state of system, the sagnac rings for similarly reaching receiving terminal are also same mode, the polarised light modulated by both ends phase difference
It is orthogonal that into the 3rd polarization beam apparatus polarization state is respectively enterd after the second circulator reaches the adjustment of the 3rd Polarization Controller
Two-way single-photon detector, i.e. the first single-photon detector and the second single-photon detector.First single-photon detector and second
Single-photon detector can be regarded as representing detection horizontal state of polarization and perpendicular polarisation state, the first single-photon detector and second respectively
Count results are fed back to host computer by single-photon detector by second control circuit, can be drawn in light path in phase and polarization state
Counting corresponding relation, as shown in Fig. 2 the abscissa in Fig. 2 represents the tune of first phase modulator and second phase modulator
Phase difference processed, ordinate represent the count value of detector；When the phase of first phase modulator or second phase modulator from 0 to
2 π change, and sine wave occurs in the counting of the corresponding polarization state on the first single-photon detector and the second single-photon detector, and does not have
When having phase place change, the counting of the first single-photon detector and the second single-photon detector is two straight lines, i.e., count value begins
It is constant eventually, without the change of amplitude, do not influenceed by the phase place change of first phase modulator or second phase modulator.
Method provided by the invention proposes for above-mentioned phase-modulated polarized state coding QKD system, is a kind of utilization
Polarization Controller regulation plus the method for single-photon detector feedback photons polarization state, in order to realize the first Polarization Controller, second
Polarization Controller and the 3rd Polarization Controller reach 45 ° of linearly polarized light incidences（Bad measurement）, phase-modulated polarized state can be used
Encode the first single-photon detector that polarization state is measured in QKD system and the second single-photon detector algorithm for design is realized, specifically
Thought be：The first Polarization Controller is first arranged to 0 ° of linearly polarized light incidence, i.e., is adjusted to the polarised light that transmitting terminal comes out
Horizontal direction light（Good measurement, because be set as that light after glancing incidence walks completely is the light path 2 of transmitting terminal, i.e., no phase modulation, then
The counting of first single-photon detector and the second single-photon detector does not change with phase place change）, then by the second Polarization Control
Device is set as 0 ° of linearly polarized light incidence, and the light even if receiving terminal is also horizon light（Principle enters with the first Polarization Controller, the level of being set as
Penetrate that rear light walks completely is the light path 2 of receiving terminal, i.e., no phase modulation）, then the 3rd Polarization Controller is set as 0 ° of linearly polarized light and entered
Penetrate, then the light path of receiving terminal and transmitting terminal is with 0 ° of referential, now raises the first Polarization Controller in 0 referential
Linearly polarized light at 45 ° is incident（The first phase modulator at both ends and second phase modularot voltage are now fixed as 0, by
The count value of one single-photon detector and the second single-photon detector is equal to be judged, because the polarised light in 45 ° of directions is in level
It is equal with the component in vertical sounding）, then the state of the second Polarization Controller now is also 45 ° of incidences, now adjusts the 3rd
Polarization Controller makes the counting of the first single-photon detector horizontal close to dark counting, i.e. minimum value, the second single-photon detector
Count value reach maximum,（Because the light path 1 of transmitting terminal and light path 2 are all during 45 ° of polarised lights first polarization beam apparatus of incidence
The light path 1 of receiving terminal and light path 2 have light when having light or 45 ° of polarised lights second polarization beam apparatus of incidence, then system both ends
Light all passes through first phase modulator and first phase modulator phase modulation, and first phase modulator and first phase modulator are adjusted
The phase of system is identical（I.e. the first phase modulator at both ends and second phase modularot voltage are fixed as 0）, namely use phase
Same base and state, now from QKD agreements, when both ends use identical base and state, can only be visited completely on a detector
Photon is measured, by the 3rd regulation Polarization Controller, makes light therethrough for horizontally or vertically light, such case only have a spy
Light can be detected by surveying on device）That is the specific flows of such as Fig. 3 is completed in both ends coordinate initialization：
Referring to Fig. 3, a kind of both ends polarization state initial method based on phase-modulated polarized state coding QKD system, specifically include
Following steps：
Step 1：The voltage of second phase modulator is fixed as 0, host computer is modulated by first control circuit to first phase
Device sends control instruction, and the voltage of first phase modulator is from minimum value to maximum searching loop, i.e. first phase modulator
Phase from 0 to 2 π searching loops, meanwhile, host computer sends control instruction by first control circuit to the first Polarization Controller
So that the first Polarization Controller constantly changes the polarization state of light, when in the first single-photon detector and the second single-photon detector
Count value when remaining constant, i.e. two slope of a curves are 0 in Fig. 2, and the first Polarization Controller stops changing light
Polarization state；Now change regardless of the phase of first phase modulator, the first single-photon detector and the second single photon detection
Count value in device remains constant；The first Polarization Controller is arranged to 0 ° of linearly polarized light incidence；
Step 2：The voltage of first phase modulator is fixed as 0, host computer is modulated by second control circuit to second phase
Device sends control instruction, and the voltage of second phase modulator is from minimum value to maximum searching loop, i.e. second phase modulator
Phase from 0 to 2 π searching loops, meanwhile, host computer sends control instruction by second control circuit to the second Polarization Controller
So that the second Polarization Controller constantly changes the polarization state of light, until two curves are changed into straight line in Fig. 2；I.e. when the first monochromatic light
When count value in sub- detector and the second single-photon detector remains constant, the second Polarization Controller stops changing light
Polarization state；The second Polarization Controller is set as 0 ° of linearly polarized light incidence；
Step 3：The voltage of the voltage of first phase modulator and second phase modulator is fixed as 0, host computer passes through
Two control circuits send control instruction to the 3rd Polarization Controller so that the 3rd Polarization Controller constantly changes the polarization state of light,
When the count value of the first single-photon detector is close to 0（That is minimum value）, the count value of the second single-photon detector reaches maximum
During value, the 3rd Polarization Controller stops changing the polarization state of light；The 3rd Polarization Controller is set as 0 ° of linearly polarized light incidence；
Step 4:Host computer sends control instruction so that first is inclined again by first control circuit to the first Polarization Controller
The controller that shakes constantly changes the polarization state of light, when the count value in the first single-photon detector and the second single-photon detector is equal
When, the first Polarization Controller stops changing the polarization state of light；It is i.e. that the first Polarization Controller is inclined in 0 referential up-regulation line at 45 °
The light that shakes is incident；
Step 5：Host computer sends control instruction so that the 3rd is inclined again by second control circuit to the 3rd Polarization Controller
The controller that shakes constantly changes the polarization state of light, when the count value of the first single-photon detector is close to 0（That is minimum value）, second is single
When the count value of photon detector reaches maximum, the 3rd Polarization Controller stops changing the polarization state of light, phase-modulated polarized
The polarization state initialization of the receiving terminal and transmitting terminal of state coding QKD system is completed.
This method encodes the related device of QKD system using phase-modulated polarized state and algorithm realizes system receiving terminal and hair
Penetrate and hold the coordinate of quick polarization state to align, cast out the trouble of additional measurement apparatus, and can be according to environment to system
Influence, carry out the alignment of both ends light coordinate axle in real time, ensure the self-reparability and stability of system.
Protection scope of the present invention includes but is not limited to embodiment of above, and protection scope of the present invention is with claims
It is defined, any replacement being readily apparent that to those skilled in the art that this technology is made, deformation, improvement each fall within the present invention's
Protection domain.
Claims (3)
1. a kind of both ends polarization state initial method based on phase-modulated polarized state coding QKD system, including phase-modulation are inclined
Polarization state encodes QKD system, and the phase-modulated polarized state coding QKD system includes transmitting terminal, receiving terminal and host computer, described to connect
Receiving end is connected by fiber channel with receiving terminal, the transmitting terminal and receiving terminal with upper mechatronics；The transmitting terminal bag
Include laser, the first Polarization Controller, first annular device, the first polarization beam apparatus, first phase modulator, attenuator and first
Control circuit, the receiving terminal include the second Polarization Controller, the second circulator, the second polarization beam apparatus, second phase modulation
Device, the 3rd Polarization Controller, the 3rd polarization beam apparatus, the first single-photon detector, the second single-photon detector and the second control
Circuit, it is characterised in that：Specifically include following steps：
Step 1：The voltage of second phase modulator is fixed as 0, host computer is modulated by first control circuit to first phase
Device sends control instruction, and the voltage of first phase modulator is from minimum value to maximum searching loop, i.e. first phase modulator
Phase from 0 to 2 π searching loops, meanwhile, host computer sends control instruction by first control circuit to the first Polarization Controller
So that the first Polarization Controller constantly changes the polarization state of light, when in the first single-photon detector and the second single-photon detector
Count value when remaining constant, the first Polarization Controller stops changing the polarization state of light；
Step 2：The voltage of first phase modulator is fixed as 0, host computer is modulated by second control circuit to second phase
Device sends control instruction, and the voltage of second phase modulator is from minimum value to maximum searching loop, i.e. second phase modulator
Phase from 0 to 2 π searching loops, meanwhile, host computer sends control instruction by second control circuit to the second Polarization Controller
So that the second Polarization Controller constantly changes the polarization state of light, when in the first single-photon detector and the second single-photon detector
Count value when remaining constant, the second Polarization Controller stops changing the polarization state of light；
Step 3：The voltage of the voltage of first phase modulator and second phase modulator is fixed as 0, host computer passes through
Two control circuits send control instruction to the 3rd Polarization Controller so that the 3rd Polarization Controller constantly changes the polarization state of light,
When the count value of the first single-photon detector reaches minimum value, when the count value of the second single-photon detector reaches maximum,
3rd Polarization Controller stops changing the polarization state of light；
Step 4:Host computer sends control instruction so that first is inclined again by first control circuit to the first Polarization Controller
The controller that shakes constantly changes the polarization state of light, when the count value in the first single-photon detector and the second single-photon detector is equal
When, the first Polarization Controller stops changing the polarization state of light；
Step 5：Host computer sends control instruction so that the 3rd is inclined again by second control circuit to the 3rd Polarization Controller
The controller that shakes constantly changes the polarization state of light, when the count value of the first single-photon detector reaches minimum value, the second single photon
When the count value of detector reaches maximum, the 3rd Polarization Controller stops changing the polarization state of light, and phase-modulated polarized state is compiled
The polarization state initialization of the receiving terminal and transmitting terminal of code QKD system is completed.
2. the both ends polarization state initial method according to claim 1 based on phase-modulated polarized state coding QKD system,
It is characterized in that：The host computer electrically connects with first control circuit, the first control circuit respectively with laser, first inclined
Shake controller and first phase modulator electrical connection, first polarization beam apparatus and first phase modulator pass through two polarization-maintainings
Optical fiber is connected so as to form transmitting terminal sagnac rings；The laser is used to produce pulsed light, and first Polarization Controller is used
First annular device is incided in the polarization state for changing light and by light, first polarization beam apparatus is used for first annular device is incident
Polarised light be divided into horizontal polarization light and orthogonal polarized light, the first phase modulator is used to modulate clockwise or counterclockwise
The phase of polarised light on direction, first polarization beam apparatus be used for the horizontal polarization light from first phase modulator and
Orthogonal polarized light converges the first annular device of merga pass and is emitted to attenuator, and attenuator is with then decay light intensity and the light sent
Pass through fibre channel transmission to receiving terminal.
3. the both ends polarization state initial method according to claim 2 based on phase-modulated polarized state coding QKD system,
It is characterized in that：The host computer electrically connects with second control circuit, the second control circuit respectively with the second Polarization Control
Device, the 3rd Polarization Controller, second phase modulator, the first single-photon detector and the electrical connection of the second single-photon detector, institute
The second polarization beam apparatus is stated to connect by two polarization maintaining optical fibres so as to form receiving terminal sagnac rings with second phase modulator；Institute
The second Polarization Controller is stated for changing the polarization state of light and light being incided into the second circulator, second polarization beam apparatus is used
In the incident polarised light of the second circulator is divided into horizontal polarization light and orthogonal polarized light, the second phase modulator is used to adjust
The phase of the polarised light of system clockwise or counterclockwise direction, second polarization beam apparatus are used to that second phase modulation will to be come from
Horizontal polarization light and orthogonal polarized light the remittance circulator of merga pass second of device are emitted to the 3rd Polarization Controller, the 3rd polarization control
Device processed is used for the polarization state for changing light and light is incided into the 3rd polarization beam apparatus, and the 3rd polarization beam apparatus is used for the inclined of incidence
The light that shakes is divided into horizontal polarization light and orthogonal polarized light, and first single-photon detector is used for the polarization for detecting horizontal state of polarization
Light, the second single-photon detector are used for the polarised light for detecting perpendicular polarisation state.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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