CN103199994B - The Active phase compensate method of Combisweep and device - Google Patents
The Active phase compensate method of Combisweep and device Download PDFInfo
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- CN103199994B CN103199994B CN201310053711.0A CN201310053711A CN103199994B CN 103199994 B CN103199994 B CN 103199994B CN 201310053711 A CN201310053711 A CN 201310053711A CN 103199994 B CN103199994 B CN 103199994B
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Abstract
The present invention discloses a kind of Active phase compensate method and device of Combisweep, be specially and add an adapter ring at Alice end, the ring that adapter ring is held with Alice and Bob is respectively interfered, scanning obtains the interference curve of Alice end and Bob end respectively, thus obtain the phase drift parameter of phase-modulator, more respectively Active phase compensate is carried out to Alice and Bob end.In the present invention, Alice and Bob only needs to carry out single pass respectively, shortens sweep time, and improves the fail safe of system.The present invention also reduces time of phasescan and complexity and independent scan for realizing Alice and Bob end avoids phase place to remap attack or side channel analysis.
Description
Technical field
The present invention relates to quantum key distribution field, more specifically, relate to a kind of Active phase compensate method and device of Combisweep.
Background technology
Phase drift is the intrinsic problem of quantum key distribution (QKD) system of phase code, be affect QKD system availability can one of key factor.The compensation scheme of single-phase scanning Active phase: suppose that the voltage that the phase-modulator that Alice holds loads and the phase place of modulating are linear, thus only scan the interference curve of Bob end.The voltage that phase-modulator loads in practical devices and the phase place of modulating not are linear, therefore propose the Active phase compensate scheme of four phasescan methods.But the interference curve that four phasescan methods need scanning Bob to hold 4 times, add time and the complexity of phasescan, and need Bob that scanning result is transferred to Alice by common signal channel, such Eve just can obtain the information of phasescan, for implementing phase remap attack or side channel analysis possibility is provided, cause relevant safety issue.
Summary of the invention
In order to overcome the deficiencies in the prior art, first the present invention proposes a kind of Active phase compensate method of Combisweep, while raising security of system, shortens sweep time.
To achieve these goals, its technical scheme is:
A kind of Active phase compensate method of Combisweep, an adapter ring is added at Alice end, described adapter ring is MZ interference ring or FM interference ring, the ring that adapter ring is held with Alice and Bob is respectively interfered, scanning obtains the interference curve of Alice end and Bob end respectively, thus obtain the phase drift parameter of phase-modulator, more respectively Active phase compensate is carried out to Alice and Bob end.
Wherein, within the regular hour, the phase difference of adapter ring is constant, exchanges the phase drift that Alice with Bob holds relative adapter ring respectively for, and the phase drift hold Alice and Bob and adapter ring are made comparisons, and obtain the phase drift parameter of Alice and Bob end.Now the phasescan of Alice end is complete in this locality completely, without Long haul fibers, Eve can not obtain any quantum state holding the information of phasescan or change Alice end to send about Alice, under this condition, Alice holds the quantum state sent to be the quantum state of pairwise orthogonal, and known phase place remaps attack and then can not implement.
Preferably, the scanning process of described Alice end is:
S11. held by Alice the phase modulation voltage of phase-modulator PMA to scan Vmax from Vmin with step-length △ V, Vmin is minimum phase modulation voltage, and Vmax is maximum phase modulation voltage;
S12. wait for N number of lock-out pulse at each magnitude of voltage Vi place, and the counting of single-photon detector to be added up, obtain counting Ci, obtain one group of data Vi, Ci}, { curve that Vi, Ci} are formed is the Single-photon interference curve of Alice end to data group;
S13. obtain according to the Single-photon interference curve of Alice end the half-wave voltage V that Alice holds phase-modulator
π, aand load 0, pi/2, π, voltage V during 3 pi/2 phase
a, 0,
v
a, π,
The scanning process of described Bob end is:
S21. held by Bob the phase modulation voltage of phase-modulator PMB to scan V ' max from V ' min with step-length △ V, V ' min is minimum phase modulation voltage, and V ' max is maximum phase modulation voltage;
S22. wait for M lock-out pulse at each magnitude of voltage V ' i place, and the counting of single-photon detector to be added up, obtain counting C ' i, obtain one group of data V ' i, C ' i}, { curve that V ' i, C ' i} is formed is the Single-photon interference curve that Bob holds to data group;
S23. obtain according to the Single-photon interference curve of Bob end the half-wave voltage V that Bob holds phase-modulator
π, band load 0, pi/2, π, voltage V during 3 pi/2 phase
b, 0,
v
b, π,
Preferably, in described step S11, Vmin to Vmax at least covers the phase range of 2 π; In described step S21, V ' min to V ' max at least covers the phase range of 2 π.
Preferably, described Alice end Active phase compensate mode is:
In the Single-photon interference curve of Alice end, to choose phase difference be the point voltage of π is reference voltage V
ref, a, then:
Wherein,
the proper phase caused by length difference for adapter ring is poor,
for Alice holds the proper phase of interference ring poor,
it is then random phase drift;
The modulation voltage working point of the phase-modulation of Alice end is:
The voltage that then Alice holds phase-modulator to load is V
a,itime, phase difference is:
Described Bob end Active phase compensate mode is:
In the Single-photon interference curve of Bob end, to choose phase difference be the point voltage of π is reference voltage V
ref, b, then
Wherein,
the proper phase caused by length difference for adapter ring is poor,
for Bob holds the proper phase of interference ring poor,
it is then random phase drift;
The modulation voltage working point of the phase-modulation of Bob end is:
The voltage that then Bob holds phase-modulator to load is V
b,jtime, phase difference is:
The present invention also proposes a kind of compensation arrangement for realizing said method, for realizing auto-compensation, reduces time of phasescan and complexity and independent scan for realizing Alice and Bob end avoids phase place to remap attack or side channel analysis.
Its specific implementation is as follows:
A kind of device being applied to the Active phase compensate method of Combisweep, comprise Alice end and hold the Bob be connected to hold with Alice, an adapter ring is added at described Alice end, described adapter ring is MZ interference ring or FM interference ring, described adapter ring is used for holding with Alice respectively and Bob holds and interferes, scanning obtains the interference curve of Alice end and Bob end respectively, thus obtains the phase drift parameter of phase-modulator, then carries out Active phase compensate respectively to Alice and Bob end.
Preferably, the Active phase compensate device of described Combisweep is based on two MZ system, and described adapter ring is MZ interference ring,
Described Alice end comprises first and second laser, phase-modulator PMA, ring retard DL1, isolator ISO1, isolator ISO2, coupler C1-C2, single-photon detector SPD3 and adapter ring; Adapter ring comprises coupler C3, C4, ring retard DL3;
Described first laser meets phase-modulator PMA and ring retard DL1 respectively by coupler C1, phase-modulator PMA and ring retard DL1 is connected in parallel, phase-modulator PMA and ring retard DL1 connects two inputs of coupler C2 respectively, one of coupler C2 exports an input of termination coupler C3, the input of another output termination isolator ISO1 of coupler C2, one output of the output termination coupler C3 of isolator ISO1, coupler C3 is connected to coupler C4 by MZ interference ring, the one output order photon detector SPD3 of coupler C4, the output of the one input termination isolator ISO2 of coupler C4, second laser connects the input of ISO2,
Described Bob end comprises phase-modulator PMB, ring retard DL2, coupler C5, C6 and single-photon detector SPD1, SPD2, one output of coupler C5 connects an input of coupler C6 by phase-modulator PMB, an output order photon detector SPD1 of coupler C6; Another output of coupler C5 connects another input of coupler C6 by ring retard DL2, another output order photon detector SPD2 of coupler C6;
Described Alice end to be held with Bob by Long haul fibers and is connected; Long haul fibers connects the output of isolator ISO1.
The scanning process of Alice end: the light pulse that the first laser sends is by coupler C1, be divided into two pulses, walk short circuit for one and enter coupler C2 through phase-modulator PMA, a walk long distances enters C2 through ring retard DL1, one in front and one in back enter C3 again, 4 pulses are divided into, respectively by long-armed optical fiber and the galianconism optical fiber of adapter ring after C3.Get ahead in 4 pulses long-armed optical fiber, after walk the pulse of galianconism optical fiber and the galianconism optical fiber that gets ahead, after walk long-armed optical fiber pulse interfere at C4 place, detect Single-photon interference curve by photon detector SPD3.
The scanning process of Bob end: the light pulse that second laser sends is divided into two pulses by coupler C4, by entering C3 after adapter ring, one in front and one in back enter Long haul fibers, arrive Bob end and be divided into 4 through coupler C5, interfere at coupler C6 place respectively through after phase-modulator PMB and ring retard DL2, photon detector carries out the detection of key by SPD1 and SPD2.
Preferably, the Active phase compensate device of described Combisweep is based on two FM system, and described adapter ring is FM interference ring,
Described Alice end comprises faraday mirror FM1-FM2, first and second laser, phase-modulator PMA, coupler BS1, circulator CIR1-CIR2, ring retard DL1, single-photon detector SPD and adapter ring, and described adapter ring comprises ring retard DL2, coupler BS2 and faraday mirror FM3-FM4;
The laser that first laser sends enters coupler BS1 and is divided into two pulses, walk long-armed and galianconism respectively, the other one end being reflected back coupler BS1 by faraday mirror FM1 and faraday mirror FM2 enters first port of circulator CIR1, enter adapter ring by second port of circulator CIR1, after coupler BS2, be divided into 4 pulses to be reflected back coupler BS2 by faraday mirror FM3 and faraday mirror FM4 respectively; Get ahead long-armed after walk galianconism and get ahead after galianconism to walk two long-armed pulses in the interference of coupler BS2 place, detect Single-photon interference curve by single-photon detector SPD; , thus obtain the phase drift parameter of Alice end
Described Bob end comprises faraday mirror FM5-FM6, phase-modulator PMB, coupler BS3, ring retard DL3, photon detector SPD1 and circulator CIR3, the laser that second laser sends enters coupler BS2 through circulator CIR2, two pulses are divided into walk the long-armed of coupler BS2 and galianconism respectively, be reflected back by faraday mirror FM3 and faraday mirror FM4 the second port that coupler BS2 one in front and one in back enters circulator CIR1 again, enter Long haul fibers through end port; Enter by Long haul fibers the first port that Bob holds circulator CIR3, enter coupler BS3 through the second port and be divided into 4 pulses, have faraday mirror FM5 and faraday mirror FM6 to be reflected back coupler BS3 respectively; Equally, get ahead long-armed after walk galianconism and get ahead to walk two long-armed pulses after galianconism and interfere at coupler BS3 place, obtain Single-photon interference curve by SPD1, obtain the phase drift parameter that Bob holds.
Preferably, described circulator is three port open loop circulators, i.e. optical routing first port input then the second port output, and the second port input then the 3rd port exports; Described end port is the 3rd port.
Compared with prior art, beneficial effect of the present invention is: the present invention interferes adapter ring to carry out Active phase compensate by holding increase by Alice.This scheme more existing Active Compensation scheme has following raising:
1, Alice end and Bob end are interfered with adapter ring respectively, obtain the operating voltage point of respective key distribution, and the phasescan process of Alice end completes in this locality completely, avoid and transmit phasescan result in common signal channel, make Eve can not obtain the information of phasescan, improve the fail safe of system.
2, the phasescan process of Alice end completes in this locality completely, and in scanning process, photon is without Long haul fibers, avoids the quantum state that Eve changes Alice transmission in phasescan process, and defence phase place remaps attacks and possible distortion.
3, Alice and Bob only need distinguish run-down, and obtain respective interference curve and can draw respective voltage power supply point, reduce the complexity of scanning, shorten the time of scanning, this just means the duty ratio of the information of improve.
4, the prerequisite of a run-down is the adjustment curve of hypothesis phase-modulator is linear, and in practical devices, adjustment curve is not linear.For the nonlinear problem of phase modulator modulation curve, two aspects can be divided into consider.About the nonlinear problem of phase modulator modulation curve on the one hand, although adjustment curve can not be accomplished completely linear in practical devices, but the linearity of lithium niobate phase modulator conventional at present can meet the requirement of QKD, and the impact for key distribution is less.About the time dependent problem of half-wave voltage of phase modulator on the other hand.Observe discovery by experiment, the half-wave voltage of phase-modulator can change after long-time use, and impact loads the accuracy of phase place.In this scheme, Alice and Bob holds the half-wave voltage of phase-modulator to be obtained by scanning result, reflects the half-wave voltage of phase-modulator in real time, therefore well solves the problem that half-wave voltage changes.
Accompanying drawing explanation
Fig. 1 is the scanning schematic diagram that the present invention is applied to Alice end in two MZ system.
Fig. 2 is that the present invention is applied to Bob end structure schematic diagram in two MZ system.
Fig. 3 is the Alice end structure schematic diagram that the present invention is applied to FM system.
Fig. 4 is the structural representation of the Bob end of FM system.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described, but embodiments of the present invention are not limited to this.
Embodiment one
As shown in Figure 1, 2, be the scanning schematic diagram of Alice end when the present invention applies in two MZ system; Add an adapter ring at Alice end, the ring held with Alice and Bob respectively by it is interfered, and show that Alice and Bob holds the phase drift parameter of phase-modulator, then compensates respectively.Described Alice end comprises first and second laser, phase-modulator PMA, ring retard DL1, isolator ISO1, isolator ISO2, coupler C1-C2, single-photon detector SPD3 and adapter ring; Adapter ring comprises coupler C3, C4, ring retard DL3;
Described first laser meets phase-modulator PMA and ring retard DL1 respectively by coupler C1, phase-modulator PMA and ring retard DL1 is connected in parallel, phase-modulator PMA and ring retard DL1 connects two inputs of coupler C2 respectively, one of coupler C2 exports an input of termination coupler C3, the input of another output termination isolator ISO1 of coupler C2, one output of the output termination coupler C3 of isolator ISO1, coupler C3 is connected to coupler C4 by MZ interference ring, the one output order photon detector SPD3 of coupler C4, the output of the one input termination isolator ISO2 of coupler C4, second laser connects the input of ISO2,
Described Bob end comprises phase-modulator PMB, ring retard DL2, coupler C5, C6 and single-photon detector SPD1, SPD2, one output of coupler C5 connects an input of coupler C6 by phase-modulator PMB, an output order photon detector SPD1 of coupler C6; Another output of coupler C5 connects another input of coupler C6 by ring retard DL2, another output order photon detector SPD2 of coupler C6;
Described Alice end to be held with Bob by Long haul fibers and is connected; Long haul fibers connects the output of isolator ISO1.
Suppose within the regular hour, the phase difference of adapter ring is that constant so Alice and Bob only needs to do phasescan with adapter ring respectively.Determine the parameter of phase drift separately, phase difference when so interfering, then the phase difference holding phase-modulator to load by Alice and Bob determines.The phasescan process of such Alice end is then complete to be completed in this locality, without Long haul fibers, Eve can not obtain any quantum state holding the information of phasescan or change Alice end to send about Alice, under this condition, Alice holds the quantum state sent to be the quantum state of pairwise orthogonal, and known phase place remaps attack and then can not implement.
In the scheme of the present embodiment, the scanning process of Alice and Bob is carried out within the very near time of interval, and the result that this scheme obtains is not the phase drift of every two rings, but the working point of key distribution, the phase drift so scanning result and the 3rd ring obtained is irrelevant.
Below for MZ system, specifically describe its scanning and the process compensated.
One, the process of scanning
The scanning process of Alice end is as follows:
1, held by Alice the phase modulation voltage of phase-modulator PMA to scan Vmax from Vmin with step-length △ V, Vmin to Vmax at least will cover the phase range of 2 π.
2, wait for N number of lock-out pulse at each magnitude of voltage Vi place, and add up to the counting of single-photon detector, obtain counting Ci, { Vi, Ci}, this curve is Single-photon interference curve to obtain one group of data.
3, can obtain according to curve the half-wave voltage V that Alice holds phase-modulator
π, aand load 0, pi/2, π, voltage V during 3 pi/2 phase
a, 0,
v
a, π,
Scanning process and the Alice of Bob end hold similar, when scanning unlike Bob, are the light sent from the laser2 laser of Alice end, after adapter ring, enter Long haul fibers, and then interfere to Bob end.After above-mentioned 1,2,3 step, obtain the interference curve of Bob end equally, and obtain the half-wave voltage V that Bob holds phase-modulator
π, band load 0, pi/2, π, voltage V during 3 pi/2 phase
b, 0,
v
b, π,
Two, phase drift compensates
1, the Active phase compensate of Alice end
Twice sweep process all can obtain the interference curve of single photon, for the scanning of Alice end.In Single-photon interference curve, the voltage that counting maximum point is corresponding is compensate the half-wave voltage V that rear Alice holds phase-modulator with the difference of the voltage of counting smallest point
π, a, to choose phase difference be the point voltage of π is reference voltage V
ref, a, then have following formula to set up:
Wherein,
the proper phase caused by length difference for adapter ring is poor,
for Alice holds the proper phase of interference ring poor,
it is then random phase drift.
The modulation voltage working point of the phase-modulation of Alice end is:
The voltage that then Alice holds phase-modulator to load is V
a,itime, phase difference is:
2, the Active phase compensate of Bob end
To choose phase difference be equally the point voltage of π is reference voltage V
ref, b, then
In like manner we can derive the modulation voltage working point of the phase-modulator of Bob end:
The voltage that then Bob holds phase-modulator to load is V
b,jtime, phase difference is:
When hypothesis is within the regular hour, the proper phase difference of adapter ring remains unchanged, and when Alice and Bob holds the intrinsic phase difference of interference ring equal, phase drift is compensated.
Embodiment two
As Fig. 3,4, Alice end comprises faraday mirror FM1-FM2, first and second laser, phase-modulator PMA, coupler BS1-BS2, circulator CIR1-CIR2, ring retard DL1, single-photon detector SPD and adapter ring, and described adapter ring comprises ring retard DL2 and faraday mirror FM3-FM4; The laser that first laser sends enters coupler BS1 and is divided into two pulses, walk long-armed and galianconism respectively, the other one end being reflected back coupler BS1 by faraday mirror FM1 and faraday mirror FM2 enters first port of circulator CIR1, enter adapter ring by second port of circulator CIR1, after coupler BS2, be divided into 4 pulses to be reflected back coupler BS2 by faraday mirror FM3 and faraday mirror FM4 respectively; Get ahead long-armed after walk galianconism and get ahead after galianconism to walk two long-armed pulses in the interference of coupler BS2 place, detect Single-photon interference curve by single-photon detector SPD; , thus obtain the phase drift parameter of Alice end
Described Bob end comprises faraday mirror FM5-FM6, phase-modulator PMB, coupler BS3, ring retard DL3, photon detector SPD1, SPD2 and circulator CIR3, the laser that second laser sends enters coupler BS2 through circulator CIR2, two pulses are divided into walk the long-armed of coupler BS2 and galianconism respectively, be reflected back by faraday mirror FM3 and faraday mirror FM4 the second port that coupler BS2 one in front and one in back enters circulator CIR1 again, enter Long haul fibers through end port; Enter by Long haul fibers the first port that Bob holds circulator CIR3, enter coupler BS3 through the second port and be divided into 4 pulses, have faraday mirror FM5 and faraday mirror FM6 to be reflected back coupler BS3 respectively; Equally, get ahead long-armed after walk galianconism and get ahead to walk two long-armed pulses after galianconism and interfere at coupler BS3 place, obtain Single-photon interference curve by SPD1 or SPD2, obtain the phase drift parameter that Bob holds.
In the present embodiment, circulator is three port open loop circulators, i.e. optical routing first port input then the second port output, and the second port input then the 3rd port exports; Described end port is the 3rd port.
The process of the scanning of the present invention in FM system and compensation and MZ systems compliant.
Combisweep Active phase compensate scheme of the present invention has following advantage:
1, Alice and Bob only needs to carry out single pass respectively, namely can obtain phase drift parameter, shortens sweep time, reduces the complexity of scanning, improves the information duty ratio of system.
2, in single-phase and four phasescan methods, Bob all needs the result of phasescan to inform Alice by classical channel, therefrom obtains the possibility of phase information so just to Eve, causes it to have an opportunity to affect or change the result of phase compensation.In this scheme, the scanning result of Alice and Bob is completely by obtaining respectively separately, classical information transmission between them can not relate to the result of phasescan, Eve then cannot obtain the relevant information of phasescan from common signal channel, thus improves the fail safe of system.
3, the scanning of Alice end completes in this locality completely, and listener-in can not obtain any quantum state holding the information of phasescan or change Alice to send about Alice.Such Alice holds 4 quantum states sent must be pairwise orthogonal each other, meet the standard of BB84 agreement completely, known phase place remaps attack and possible distortion just loses its physical basis, and institute is can not implement, this improves the fail safe of system.
Above-described embodiments of the present invention, do not form limiting the scope of the present invention.Any amendment done within spiritual principles of the present invention, equivalent replacement and improvement etc., all should be included within claims of the present invention.
Claims (8)
1. the Active phase compensate method of a Combisweep, it is characterized in that, an adapter ring is added at Alice end, described adapter ring is MZ interference ring or FM interference ring, the ring that adapter ring is held with Alice and Bob is respectively interfered, scanning obtains the interference curve of Alice end and Bob end respectively, thus obtains the phase drift parameter of phase-modulator, then carries out Active phase compensate respectively to Alice and Bob end.
2. the Active phase compensate method of Combisweep according to claim 1, is characterized in that,
The scanning process of described Alice end is:
S11. held by Alice the phase modulation voltage of phase-modulator PMA to scan Vmax from Vmin with step-length △ V, Vmin is minimum phase modulation voltage, and Vmax is maximum phase modulation voltage;
S12. wait for N number of lock-out pulse at each magnitude of voltage Vi place, and the counting of single-photon detector to be added up, obtain counting Ci, obtain one group of data Vi, Ci}, { curve that Vi, Ci} are formed is the Single-photon interference curve of Alice end to data group;
S13. obtain according to the Single-photon interference curve of Alice end the half-wave voltage V that Alice holds phase-modulator
π, aand load 0, pi/2, π, voltage V during 3 pi/2 phase
a, 0,
v
a, π,
The scanning process of described Bob end is:
S21. held by Bob the phase modulation voltage of phase-modulator PMB to scan V ' max from V ' min with step-length △ V, V ' min is minimum phase modulation voltage, and V ' max is maximum phase modulation voltage;
S22. wait for M lock-out pulse at each magnitude of voltage V ' i place, and the counting of single-photon detector to be added up, obtain counting C ' i, obtain one group of data V ' i, C ' i}, { curve that V ' i, C ' i} is formed is the Single-photon interference curve that Bob holds to data group;
S23. obtain according to the Single-photon interference curve of Bob end the half-wave voltage V that Bob holds phase-modulator
π, band load 0, pi/2, π, voltage V during 3 pi/2 phase
b, 0,
v
b, π,
3. the Active phase compensate method of Combisweep according to claim 2, is characterized in that, in described step S11, Vmin to Vmax at least covers the phase range of 2 π; In described step S21, V ' min to V ' max at least covers the phase range of 2 π.
4. the Active phase compensate method of the Combisweep according to Claims 2 or 3, is characterized in that,
Described Alice end Active phase compensate mode is:
In the Single-photon interference curve of Alice end, to choose phase difference be the point voltage of π is reference voltage V
ref, a, then:
Wherein,
the proper phase caused by length difference for adapter ring is poor,
for Alice holds the proper phase of interference ring poor,
it is then random phase drift;
The modulation voltage working point of the phase-modulation of Alice end is:
The voltage that then Alice holds phase-modulator to load is V
a,itime, phase difference is:
wherein i=0,1,2,3;
Described Bob end Active phase compensate mode is:
In the Single-photon interference curve of Bob end, to choose phase difference be the point voltage of π is reference voltage V
ref, b, then
Wherein,
the proper phase caused by length difference for adapter ring is poor,
for Bob holds the proper phase of interference ring poor,
it is then random phase drift;
The modulation voltage working point of the phase-modulation of Bob end is:
The voltage that then Bob holds phase-modulator to load is V
b,jtime, phase difference is:
wherein j=0,1,2,3.
5. one kind is applied to the device of the Active phase compensate method of Combisweep, comprise Alice end and hold the Bob be connected to hold with Alice, it is characterized in that, an adapter ring is added at described Alice end, described adapter ring is MZ interference ring or FM interference ring, described adapter ring is used for holding with Alice respectively and Bob holds and interferes, scanning obtains the interference curve of Alice end and Bob end respectively, thus obtain the phase drift parameter of phase-modulator, more respectively Active phase compensate is carried out to Alice and Bob end.
6. device according to claim 5, is characterized in that, the Active phase compensate device of described Combisweep is based on two MZ system, and described adapter ring is MZ interference ring,
Described Alice end comprises first and second laser, phase-modulator PMA, ring retard DL1, isolator ISO1, isolator ISO2, coupler C1-C2, single-photon detector SPD3 and adapter ring; Adapter ring comprises coupler C3, C4, ring retard DL3;
Described first laser meets phase-modulator PMA and ring retard DL1 respectively by coupler C1, phase-modulator PMA and ring retard DL1 is connected in parallel, phase-modulator PMA and ring retard DL1 connects two inputs of coupler C2 respectively, one of coupler C2 exports an input of termination coupler C3, the input of another output termination isolator ISO1 of coupler C2, one output of the output termination coupler C3 of isolator ISO1, coupler C3 is connected to coupler C4 by MZ interference ring, the one output order photon detector SPD3 of coupler C4, the output of the one input termination isolator ISO2 of coupler C4, second laser connects the input of ISO2,
Described Bob end comprises phase-modulator PMB, ring retard DL2, coupler C5, C6 and single-photon detector SPD1, SPD2, one output of coupler C5 connects an input of coupler C6 by phase-modulator PMB, an output order photon detector SPD1 of coupler C6; Another output of coupler C5 connects another input of coupler C6 by ring retard DL2, another output order photon detector SPD2 of coupler C6;
Described Alice end to be held with Bob by Long haul fibers and is connected; Long haul fibers connects the output of isolator ISO1.
7. device according to claim 5, is characterized in that, the Active phase compensate device of described Combisweep is based on two FM system, and described adapter ring is FM interference ring,
Described Alice end comprises faraday mirror FM1-FM2, first and second laser, phase-modulator PMA, coupler BS1, circulator CIR1-CIR2, ring retard DL1, single-photon detector SPD and adapter ring, and described adapter ring comprises ring retard DL2, coupler BS2 and faraday mirror FM3-FM4;
The laser that described first laser sends enters coupler BS1 and is divided into two pulses, walk long-armed and galianconism respectively, the other one end being reflected back coupler BS1 by faraday mirror FM1 and faraday mirror FM2 enters first port of circulator CIR1, enter adapter ring by second port of circulator CIR1, after coupler BS2, be divided into 4 pulses to be reflected back coupler BS2 by faraday mirror FM3 and faraday mirror FM4 respectively; Get ahead long-armed after walk galianconism and get ahead after galianconism to walk two long-armed pulses in the interference of coupler BS2 place, detect Single-photon interference curve by single-photon detector SPD;
Described Bob end comprises faraday mirror FM5-FM6, phase-modulator PMB, coupler BS3, ring retard DL3, photon detector SPD1 and circulator CIR3, the laser that second laser sends enters coupler BS2 through circulator CIR2, two pulses are divided into walk the long-armed of coupler BS2 and galianconism respectively, be reflected back by faraday mirror FM3 and faraday mirror FM4 the second port that coupler BS2 one in front and one in back enters circulator CIR1 again, enter Long haul fibers through end port; Enter by Long haul fibers the first port that Bob holds circulator CIR3, enter coupler BS3 through the second port and be divided into 4 pulses, have faraday mirror FM5 and faraday mirror FM6 to be reflected back coupler BS3 respectively; Equally, get ahead long-armed after walk galianconism and get ahead after galianconism to walk two long-armed pulses in the interference of coupler BS3 place, obtain Single-photon interference curve by SPD1.
8. device according to claim 7, is characterized in that, described circulator is three port open loop circulators, i.e. optical routing first port input then the second port output, and the second port input then the 3rd port exports; Described end port is the 3rd port.
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| CN105959113B (en) * | 2016-07-06 | 2018-11-30 | 洛阳师范学院 | For preventing the quantum key distribution method of detector side channel attack |
| CN108242996B (en) * | 2016-12-23 | 2020-11-17 | 华为技术有限公司 | Quantum key distribution method and device |
| CN106656491B (en) * | 2016-12-30 | 2019-08-09 | 北京信息科学技术研究院 | The compensation method of half-wave voltage of phase modulator in a kind of quantum key dispatching system |
| CN107631814B (en) * | 2017-09-14 | 2020-09-01 | 电子科技大学 | Optical self-coherent sensing optical path structure, frequency shift change detection method and sensing device |
| CN108540284B (en) * | 2018-06-01 | 2020-11-20 | 北京大学 | Continuous variable quantum key distribution post-processing heterodyne detection phase compensation method |
| CN112653521B (en) * | 2019-10-11 | 2022-08-19 | 科大国盾量子技术股份有限公司 | Phase encoding QKD system and phase compensation device and method thereof |
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