CN106506096A - A kind of unequal arm interference ring and quantum key dispatching system - Google Patents
A kind of unequal arm interference ring and quantum key dispatching system Download PDFInfo
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- CN106506096A CN106506096A CN201610928137.2A CN201610928137A CN106506096A CN 106506096 A CN106506096 A CN 106506096A CN 201610928137 A CN201610928137 A CN 201610928137A CN 106506096 A CN106506096 A CN 106506096A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/70—Photonic quantum communication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
- H04L9/0816—Key establishment, i.e. cryptographic processes or cryptographic protocols whereby a shared secret becomes available to two or more parties, for subsequent use
- H04L9/0852—Quantum cryptography
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L2209/00—Additional information or applications relating to cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00
- H04L2209/08—Randomization, e.g. dummy operations or using noise
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L2209/00—Additional information or applications relating to cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00
- H04L2209/80—Wireless
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- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The present invention provides a kind of unequal arm interference ring based on single beam splitter, a kind of unequal arm interference ring based on polarization beam apparatus and polarization-maintaining beam splitter, and the quantum key dispatching system that a kind of transmitting terminal and receiving terminal at least one end is constituted using above-mentioned unequal arm interference ring.The unequal arm interference ring and interference technique greatly improved the quantum safe key rate of single end of probe；The quantum key dispatching system will not increase the Polarization Control of system and the complexity of phase compensation.In a word, the present invention improves the quantum safe key rate of single end of probe on the premise of scheme complexity is not increased, with higher practical value.
Description
Technical field
The invention belongs to quantum information technology field, and in particular to a kind of unequal arm interference ring and quantum-key distribution system
System.
Background technology
Quantum-key distribution can ensure that the information transfer of unconditional security, thus be the weight of cutting edge technology area research
Point.Its coded system mainly has two kinds of phase code and polarization encoder.In fiber-optic transfer, due to being imitated by fiber birefringence
The impact that answers, the polarization of quantum optical signal can occur change at random.Compared with polarization, the relative phase of light is in fiber-optic transfer process
Then show highly stable.Therefore, PE system is the main code mode of fiber quantum key distribution system.
In one-way transmission, topmost phase encoding scheme be United States Patent (USP) (U5307410) propose symmetrical "
Arm Mach-Zehnder (Mach-Zehnder) interference ring " scheme.In this scenario, light pulse is interfered by the unequal arm of transmitting terminal
Ring can be divided into former and later two pulses.In receiving terminal, the two pulses are further divided into four arteries and veins after unequal arm interference ring
Punching, each pulse account for 1/4 (not considering to decay) of total light energy.In this four pulses, there are two pulses while reaching recipient
3dB beam splitters after overlap to form interference, one of successively through sender's interference ring " galianconism " and recipient's interference ring
" long-armed ", another is successively through " galianconism " of " long-armed " and recipient's interference ring of sender's interference ring.Therefore, participate in
The light energy of interference is only 1/2 to the utilization rate of total light energy, and final quantum safe key rate is near with the capacity usage ratio
It is directly proportional.
In order to overcome this problem, Gobby C et al. dexterously to improve total utilization ratio of optical energy using polarization beam apparatus
To 100% (not considering that device is decayed) [Gobby C, Yuan Z L, ShieldsAJ.Quantum key distribution
over 122km ofstandard telecom fiber[J].Applied Physics Letters,2004,84(19):
3762-3764.].But as two pulse polarization states that the unequal arm interference ring of program transmitting terminal is exported are mutually perpendicular to, optical fiber
The birefringence effect of circuit can not only affect the size of total utilization ratio of optical energy, can also change the relative phase of two interference pulses
Position.Therefore, the program not only needs the birefringence effect of compensated optical fiber circuit to maximize total utilization ratio of optical energy, in addition it is also necessary to enter
, to stablize relative phase, scheme is complicated, is unfavorable for implementing for the extra phase compensation of row.
Content of the invention
Present invention aims to the deficiencies in the prior art, there is provided a kind of unequal arm interference ring and quantum-key distribution
System, to solve the problems, such as that existing unequal arm interference ring cannot not only improve utilization ratio of optical energy but also not increase scheme complexity.
A kind of unequal arm interference ring is provided, including beam splitter, delay line and phase converter, beam splitter have first port,
Two-port netwerk, the 3rd port and the 4th port, wherein first port and second port are located at the side of beam splitter, the 3rd port and the
Opposite side of four ports positioned at beam splitter, input of the first port as unequal arm interference ring, the 3rd port is used as unequal arm
The outfan of interference ring；Delay line is connected between second port and the 4th port so as to form light circuit, and the delay line is used for
Increase the delay of the light pulse that transmits in light circuit；Phase converter, for carrying out phase-modulation to light pulse, to realize that quantum is close
The phase code that key distributorship agreement specifies, is connected to input or is connected in light circuit.
Further, also include that polarization compensator, polarization compensator are connected in light circuit, for being maintained at beam splitter
The polarization of two light pulses for interfering is consistent.
Further, also include that attenuator, attenuator are connected in light circuit, interfere the tight of output for adjusting unequal arm
The ratio of the average light energy between two adjacent light pulses.
Further, beam splitter is variable beamsplitter.
A kind of unequal arm interference ring is provided, including polarization-maintaining beam splitter, polarization beam apparatus, is protected off-delay line, protected inclined phase converter
And circulator, polarization-maintaining beam splitter has first port, second port, the 3rd port and the 4th port, wherein first port and
Two-port netwerk is located at the side of polarization-maintaining beam splitter, and the 3rd port and the 4th port are located at the opposite side of polarization-maintaining beam splitter, polarization beam splitting
Device includes fifth port, the 6th port and the 7th port, and circulator includes the 8th port, the 9th port and the tenth port, the 8th
Input of the port as unequal arm interference ring, outfan of the tenth port as unequal arm interference ring, fifth port connection the
Nine ports form the first light path, and the 6th port connects the 3rd port and forms the second light path, and the 7th port connection first port is formed
3rd light path；Delay line is connected between second port and the 4th port so as to forming light circuit, is protected inclined phase converter and is connected to the
In one light path or light circuit, or it is connected with input, is connected with the second light path and/or the 3rd light path for realizing that level is inclined
The transducer of mutual phase transformation is shaken and vertically polarizes, the second light path, the 3rd light path and light circuit are Bao Pianguanglu.
Further, transducer is polarization compensator or Faraday rotator.
Further, also include that attenuator, attenuator are connected in light circuit.
A kind of quantum key dispatching system is provided, including transmitting terminal, quantum channel and receiving terminal, transmitting terminal includes laser
Device, the first interference ring and strong attenuator, and the input connecting laser of the first interference ring, outfan connect the defeated of strong attenuator
Enter end, the outfan connection quantum channel of strong attenuator；Receiving terminal includes the second interference ring and single-photon detector, and second interferes
The input connection quantum channel of ring, outfan connect single-photon detector, and the second interference ring is that any of the above-described unequal arm is done
Relate to ring.
Further, the first interference ring is any of the above-described unequal arm interference ring.
Further, single-photon detector adopts gating patterns single-photon detector.
Compared with the existing mainstream technology that announces with United States Patent (USP) (U5307410), the quantum key dispatching system of the present invention
In, transmitting terminal unequal arm interference ring beam splitting two coherent pulse light energies out are different.When using 3dB beam splitters and not considering
During decay, transmitting terminal beam splitting first pulse out and second pulse account for the 2/3 and 1/3 of gross energy respectively.First when individual
Pulse is divided into two beam of light energy identical in receiving terminal by 3dB beam splitters, and two beam accounts for the 1/3 of total light energy.Wherein a branch of
When returning to beam splitter by light circuit, second pulse just also reaches the beam splitter, and both form superposition and interfere.Therefore, do
It is 2/3 that pulse is related to the utilization rate of total light energy, it means that quantum safe key rate can be promoted to 4/3 times of (1/2) originally.
As the unequal arm interference ring of the present invention only has an outfan, therefore, the present invention is applied to single end of probe phase code quantum
Key distribution scheme, the program not only can evade the security breaches caused due to the difference of double detector, and also there is low cost
Advantage with miniaturization.
By selecting suitable splitting ratio, the utilization ratio of optical energy of the single output port of unequal arm interference ring of the invention is also
Can further improve to 3/4 or so (consideration device slightly can reduce when decaying) from 2/3.Although the utilization rate is still below Gobby
The scheme that the researcheres such as C are proposed, but apply the quantum key dispatching system of the unequal arm interference ring of the present invention make transmitting
Bring out that the two coherent pulse polarization states that penetrates are orthogonal, it is therefore not necessary to the polarization variations compensation of the middle quantum channel of complexity
And relative phase drift compensation.In a word, the present invention improves the amount of single end of probe on the premise of scheme complexity is not increased
Sub- safe key rate, with higher practical value.
Description of the drawings
Accompanying drawing described herein is used for providing further understanding of the present application, constitutes the part of the application, at this
Used in a little accompanying drawings, identical reference number is representing same or analogous part, the schematic description and description of the application
For explaining the application, the improper restriction to the application is not constituted.In the accompanying drawings：
Fig. 1 is the structural representation of unequal arm interference ring embodiment 1 of the present invention；
Fig. 2 is the structural representation of unequal arm interference ring embodiment 2 of the present invention；
Fig. 3 is the structural representation of unequal arm interference ring embodiment 3 of the present invention；
Fig. 4 is the structural representation of unequal arm interference ring embodiment 4 of the present invention；
Fig. 5 is the structural representation of unequal arm interference ring embodiment 5 of the present invention；
Fig. 6 is the structural representation of unequal arm interference ring embodiment 6 of the present invention；
Fig. 7 is the block schematic illustration of quantum key dispatching system of the present invention.
Specific embodiment
Purpose, technical scheme and advantage for making the application is clearer, below in conjunction with drawings and the specific embodiments, to this
Application is described in further detail.For the sake of simplicity, eliminate well known to a person skilled in the art some skills in below describing
Art feature.
Embodiment 1：
A kind of unequal arm interference ring, as shown in figure 1, it includes a 2x2 beam splitter 4, a delay line 7 and a phase modulation
Device 2.Input of the first port 3 as unequal arm interference ring, outfan of the 3rd port 5 as unequal arm interference ring postpone
Line 7 is connected between second port 8 and the 4th port 6 so as to form light circuit, and phase converter 2 connects first port 3.
First light pulse first enters unequal arm interference ring from input light path 1, by being applied in phase place tune during phase converter 2
System, with after through first port 3 enter beam splitter 4, when beam splitter 4 by beam splitting be two light pulses；One of light pulse
Along the 5 direct output of the 3rd port, another light pulse enters light circuit through the 4th port 6, from the after delay line 7 postpones
Two-port netwerk 8 returns to beam splitter 4；At this moment, second light pulse for entering unequal arm interference ring afterwards just reaches beam splitter 4 first,
Two light pulses are formed in beam splitter 4 to be interfered, and exports finally by the 3rd port 5.If successively entering unequal arm interference ring
Two light pulses are |coherent state | pulse, then by setting the average photon number ratio between them and scanning between them
Relative phase, can observe 100% visibility of interference fringes in the 3rd port 5 in theory.If after interfering, pulse enters the
The light energy of the pulse can be reduced to original less than 1% by four ports 6, then the 7 of beam splitter 4 time beam splitting effect.
Embodiment 2：
A kind of unequal arm interference ring, as shown in Fig. 2 including a 2x2 beam splitter 4, a delay line 7 and a phase converter
2.Input of the first port 3 as unequal arm interference ring, outfan of the 3rd port 5 as unequal arm interference ring, delay line 7
It is connected between second port 8 and the 4th port 6 so as to form light circuit, in the connection light circuit of phase converter 2.
First light pulse first enters beam splitter 4 through first port 3, is two light pulses by beam splitting when beam splitter 4；
One of light pulse enters light circuit along the 5 direct output of the 3rd port, another light pulse through the 4th port 6, by adjusting
Phase-modulation is applied in during phase device 2, after delay line 7 postpones, beam splitter 4 is returned to from second port 8；At this moment, enter afterwards
Second light pulse of arm interference ring just reaches beam splitter 4 first, and two light pulses are formed in beam splitter 4 to be interfered, and finally leads to
Cross the 3rd port 5 to export.
Embodiment 3：
A kind of unequal arm interference ring, as shown in figure 3, including a 2x2 beam splitter 4,7, phase converter 2 of a delay line
With an attenuator 9.Input of the first port 3 as unequal arm interference ring, the 3rd port 5 is used as the defeated of unequal arm interference ring
Go out end, delay line 7 is connected between second port 8 and the 4th port 6 so as to form light circuit, and phase converter 2 and attenuator 9 connect
It is connected in light circuit.
First light pulse first enters beam splitter 4 through first port 3, is two light pulses by beam splitting when beam splitter 4；
One of light pulse enters light circuit along the 5 direct output of the 3rd port, another light pulse through the 4th port 6, by adjusting
Phase-modulation is applied in during phase device 2, is postponed by delay line 7, then beam splitting is returned to from second port 8 after attenuator 9 is decayed
Device 4；At this moment, second light pulse for entering unequal arm interference ring afterwards just reaches beam splitter 4 first, and two light pulses are in beam splitting
Device 4 is formed interferes, and exports finally by the 3rd port 5.By setting the splitting ratio of beam splitter 4 and the pad value of attenuator 9, can
With make from the average photon number between first light pulse and second light pulse and then exporting of the output of the 3rd port 5 it
Than being equal to desired ratio.When the embodiment is applied to the transmitting terminal of quantum key dispatching system, the decay Ying Fei of attenuator 9
Chang Qiang, the average photon number of the 3rd pulse for exporting the 3rd port 5 decay to negligible.
Embodiment 4：
A kind of unequal arm interference ring, as shown in figure 4, including a 2x2 polarization-maintaining beam splitter 41, protect off-delay line 71,
One circulator, 20, polarization beam apparatus 30 and one protect inclined phase converter 21.Wherein, polarization beam apparatus 10 include the 5th end
Mouth, the 6th port and the 7th port, circulator 20 include the 8th port 201, the 9th port 202 and the tenth port 203, the 8th end
Input 11 of the mouth 201 as unequal arm interference ring, outfan of the tenth port 203 as unequal arm interference ring, fifth port
Connect the 9th port 202 and form the first light path, the 6th port connection the 3rd port 51 forms the second light path, the 7th port connection the
Single port 31 forms the 3rd light path；Delay line 71 is connected between second port 81 and the 4th port 61 so as to form light circuit,
Protect inclined phase converter 21 to be connected with input 11.
First light pulse first enters unequal arm interference ring from input 11, is applied in when it is by protecting inclined phase converter 21
Phase-modulation, then reaches polarization beam apparatus 10 by circulator 20.According to the polarization characteristic of light pulse, polarization beam apparatus 10 will
Its beam splitting is horizontally and vertically two components, and the polarization state in the two components at least one applies unitary transformation or farad
Rotation so that horizontally and vertically polarization state of two components when polarization-maintaining beam splitter 41 is reached is identical.
Horizontal component enters polarization-maintaining beam splitter 41 through the 3rd port 51 after the output of the 6th port, by polarization-maintaining beam splitter 41
Beam splitting is two light pulses.One of light pulse is passed sequentially through after first port 31, polarization beam apparatus 10, circulator 20 through
Ten ports 203 export；Another light pulse pass sequentially through second port 81 and protect off-delay line 71 after through the 4th port 61 times
Polarization-maintaining beam splitter 41 is arrived, now, the horizontal component for entering second light pulse of unequal arm interference ring afterwards just reaches guarantor first
Partially beam splitter 41, two light pulses are formed in polarization-maintaining beam splitter 41 to be interfered, finally by first port 31, polarization beam apparatus 10,
Export through the tenth port 203 after circulator 20.
Vertical component enters polarization-maintaining beam splitter 41 through first port 31 after the output of the 7th port, by polarization-maintaining beam splitter 41
Beam splitting is two light pulses.One of light pulse passes sequentially through the 3rd port 51, polarization beam apparatus 10, after circulator 20 through
Ten ports 203 export；Another light pulse pass sequentially through the 4th port 61 and protect off-delay line 71 after through second port 81 times
Polarization-maintaining beam splitter 41 is arrived, now, the vertical component for entering second light pulse of unequal arm interference ring afterwards just reaches guarantor first
Partially beam splitter 41, two light pulses are formed in polarization-maintaining beam splitter 41 to be interfered, finally by the 3rd port 51, polarization beam apparatus 10,
Export through the tenth port 203 after circulator 20.
Embodiment 5：
A kind of unequal arm interference ring, as shown in figure 5, including a 2x2 polarization-maintaining beam splitter 41, protect off-delay line 71,
One circulator, 20, polarization beam apparatus 30 and one protect inclined phase converter 21.Wherein, polarization beam apparatus 10 include the 5th end
Mouth, the 6th port and the 7th port, circulator 20 include the 8th port 201, the 9th port 202 and the tenth port 203, the 8th end
Input of the mouth 201 as unequal arm interference ring, outfan of the tenth port 203 as unequal arm interference ring, fifth port connect
Connect the 9th port 202 and form the first light path, the 6th port connection the 3rd port 51 forms the second light path, the 7th port connection first
Port 31 forms the 3rd light path；Delay line 71 is connected between second port 81 and the 4th port 61 so as to form light circuit, is protected
Phase converter 21 partially is connected in light circuit.
First light pulse first enters unequal arm interference ring from the 8th port 201, then reaches polarization by circulator 20
Beam splitter 10.According to the polarization characteristic of light pulse, its beam splitting is horizontally and vertically two components by polarization beam apparatus 10, to this two
In individual component, at least one polarization state applies unitary transformation or Faraday rotation so that horizontally and vertically two components are arrived
Identical up to polarization state during polarization-maintaining beam splitter 41.
Horizontal component enters polarization-maintaining beam splitter 41 through the 3rd port 51 after the output of the 6th port, by polarization-maintaining beam splitter 41
Beam splitting is two light pulses.One of light pulse is passed sequentially through after first port 31, polarization beam apparatus 10, circulator 20 through
Ten ports 203 export；Another light pulse passes sequentially through second port 81, protects off-delay line 71 and pass through after protecting inclined phase converter 21
4th port 61 returns to polarization-maintaining beam splitter 41, now, is just entering the horizontal component of second light pulse of unequal arm interference ring afterwards
Good arrival polarization-maintaining beam splitter 41 first, two light pulses are formed in polarization-maintaining beam splitter 41 to be interfered, finally by first port 31, partially
Shake.
Vertical component enters polarization-maintaining beam splitter 41 through first port 31 after the output of the 7th port, by polarization-maintaining beam splitter 41
Beam splitting is two light pulses.One of light pulse passes sequentially through the 3rd port 51, polarization beam apparatus 10, after circulator 20 through
Ten ports 203 export；Another light pulse passes sequentially through the 4th port 61, protects inclined phase converter 21 and pass through after protecting off-delay line 71
Second port 81 returns to polarization-maintaining beam splitter 41, now, is just entering the vertical component of second light pulse of unequal arm interference ring afterwards
Good arrival polarization-maintaining beam splitter 41 first, two light pulses are formed in polarization-maintaining beam splitter 41 to be interfered, finally by the 3rd port 51, partially
Shake.
Embodiment 6：
A kind of unequal arm interference ring, as shown in fig. 6, including a 2x2 polarization-maintaining beam splitter 41, protect off-delay line 71,
One polarization beam apparatus 30, of circulator 20, protects inclined phase converter 21 and an attenuator 91.Wherein, polarization beam apparatus
10 include that fifth port, the 6th port and the 7th port, circulator 20 include the 8th port 201, the 9th port 202 and the tenth end
Mouth 203, input of the 8th port 201 as unequal arm interference ring, output of the tenth port 203 as unequal arm interference ring
End, fifth port connection the 9th port 202 form the first light path, and the 6th port connection the 3rd port 51 forms the second light path, the
Seven ports connection first port 31 forms the 3rd light path；Delay line 71 be connected between second port 81 and the 4th port 61 so as to
Light circuit is formed, inclined phase converter 21 is protected and attenuator 91 is both connected in light circuit.
First light pulse first enters unequal arm interference ring from the 8th port 201, then reaches polarization by circulator 20
Beam splitter 10.According to the polarization characteristic of light pulse, its beam splitting is horizontally and vertically two components by polarization beam apparatus 10, to this two
In individual component, at least one polarization state applies unitary transformation or Faraday rotation so that horizontally and vertically two components are arrived
Identical up to polarization state during polarization-maintaining beam splitter 41.
Horizontal component enters polarization-maintaining beam splitter 41 through the 3rd port 51 after the output of the 6th port, by polarization-maintaining beam splitter 41
Beam splitting is two light pulses.One of light pulse is passed sequentially through after first port 31, polarization beam apparatus 10, circulator 20 through
Ten ports 203 export；Another light pulse passes sequentially through second port 81, attenuator 91, protects off-delay line 71 and protect and adjust partially
Polarization-maintaining beam splitter 41 is returned to through the 4th port 61 after phase device 21, now, second light pulse of unequal arm interference ring is entered afterwards
Horizontal component just reaches polarization-maintaining beam splitter 41 first, and two light pulses are formed in polarization-maintaining beam splitter 41 to be interfered, finally by the
Export through the tenth port 203 after Single port 31, polarization beam apparatus 10, circulator 20.
Vertical component enters polarization-maintaining beam splitter 41 through first port 31 after the output of the 7th port, by polarization-maintaining beam splitter 41
Beam splitting is two light pulses.One of light pulse passes sequentially through the 3rd port 51, polarization beam apparatus 10, after circulator 20 through
Ten ports 203 export；Another light pulse passes sequentially through the 4th port 61, protects inclined phase converter 21, protects off-delay line 71 and decline
Polarization-maintaining beam splitter 41 is returned to through second port 81 after subtracting device 91, now, second light pulse of unequal arm interference ring is entered afterwards
Vertical component just reaches polarization-maintaining beam splitter 41 first, and two light pulses are formed in polarization-maintaining beam splitter 41 to be interfered, finally by the
Three ports 51, polarization beam apparatus 10, export through the tenth port 203 after circulator 20.
Embodiment 7：
A kind of quantum key dispatching system, as shown in fig. 7, comprises transmitting terminal, quantum channel 104 and receiving terminal；Transmitting terminal
Including laser instrument 101, the first interference ring 102 and strong attenuator 103, and the input connecting laser of the first interference ring 102
101, outfan connects the input of strong attenuator 103, the outfan connection quantum channel 104 of strong attenuator 103；Receiving terminal bag
Include the second interference ring 105 and single-photon detector 106, the input connection quantum channel 104 of the second interference ring 105, outfan
Connection single-photon detector 106, unequal arm interference ring of first interference ring 102 using the present embodiment 6, the second interference ring 105 are adopted
Unequal arm interference ring with the present embodiment 5.
Transmitting terminal and receiving terminal both sides execute single end of probe phase code quantum key distribution protocol, i.e. transmitting terminal and reception
End both sides are adjusted to the relative phase of interference pulse using the phase modulation function of unequal arm interferometer, the phase place equiprobability of regulation
Ground randomly from 0, pi/2, π, 3 pi/2s in select one.Single-photon detector 106 adopts gating patterns, is only used for receiving and interferes
Pulse.
Embodiment described above only represents the several embodiments of the present invention, and its description is more concrete and detailed, but not
It is understood that as limitation of the scope of the invention.It should be pointed out that for the person of ordinary skill of the art, without departing from
On the premise of present inventive concept, some deformations and improvement can also be made, these belong to the scope of the present invention.Therefore this
Bright protection domain should be defined by the claim.
Claims (10)
1. a kind of unequal arm interference ring, including beam splitter, delay line and phase converter, the beam splitter have first port, second
Port, the 3rd port and the 4th port, wherein first port and second port are located at the side of beam splitter, the 3rd port and the 4th
Port is located at the opposite side of beam splitter, it is characterised in that：Input of the first port as unequal arm interference ring, described
Outfan of three ports as unequal arm interference ring, the delay line are connected between second port and the 4th port so as to being formed
Light circuit, the phase converter connection input is connected in light circuit.
2. unequal arm interference ring according to claim 1, it is characterised in that：Also include polarization compensator, polarization compensator
It is connected in the light circuit.
3. unequal arm interference ring according to claim 1 and 2, it is characterised in that：Also include that attenuator, attenuator are connected to
In the light circuit.
4. unequal arm interference ring according to claim 1 and 2, it is characterised in that：The beam splitter is variable beamsplitter.
5. a kind of unequal arm interference ring, including polarization-maintaining beam splitter, polarization beam apparatus, protects off-delay line, protects inclined phase converter and annular
Device, the polarization-maintaining beam splitter have first port, second port, the 3rd port and the 4th port, wherein first port and second
Port is located at the side of the polarization-maintaining beam splitter, and the 3rd port and the 4th port are located at the opposite side of the polarization-maintaining beam splitter, institute
Stating polarization beam apparatus includes fifth port, the 6th port and the 7th port, the circulator include the 8th port, the 9th port and
Tenth port, it is characterised in that：Input of 8th port as the unequal arm interference ring, the tenth port conduct
The outfan of the unequal arm interference ring, the fifth port connect the 9th port and form the first light path, and the 6th port connects
Connect the 3rd port and form the second light path, the 7th port connects the first port and forms the 3rd light path；The delay
Line is connected between the second port and the 4th port so as to form light circuit, and the inclined phase converter of the guarantor is connected to the first light path
Or in light circuit, or be connected with input, it is connected with second light path and/or the 3rd light path for realizing horizontal polarization
The transducer of mutual phase transformation is vertically polarized, and second light path, the 3rd light path and light circuit are Bao Pianguanglu.
6. unequal arm interference ring according to claim 5, it is characterised in that：The transducer is polarization compensator or farad
Rotator.
7. the unequal arm interference ring according to claim 5 or 6, it is characterised in that：Also include that attenuator, attenuator are connected to
In the light circuit.
8. a kind of quantum key dispatching system, including transmitting terminal, quantum channel and receiving terminal, the transmitting terminal includes the first interference
Ring, the receiving terminal include the second interference ring and single-photon detector, it is characterised in that：Second interference ring is claim
Arbitrary unequal arm interference ring described in 1-4 or claim 5-7.
9. quantum key dispatching system according to claim 8, it is characterised in that：First interference ring is claim
Arbitrary unequal arm interference ring described in 1-4 or claim 5-7.
10. quantum key dispatching system according to claim 8, it is characterised in that：The single-photon detector is gate
Pattern single-photon detector.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610928137.2A CN106506096B (en) | 2016-10-31 | 2016-10-31 | A kind of unequal arm interference ring and quantum key dispatching system |
| PCT/CN2017/094207 WO2018076831A1 (en) | 2016-10-31 | 2017-07-25 | Unequal-arm interference ring and quantum key distribution system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610928137.2A CN106506096B (en) | 2016-10-31 | 2016-10-31 | A kind of unequal arm interference ring and quantum key dispatching system |
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| CN106506096A true CN106506096A (en) | 2017-03-15 |
| CN106506096B CN106506096B (en) | 2018-08-07 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2018076831A1 (en) * | 2016-10-31 | 2018-05-03 | 四川航天机电工程研究所 | Unequal-arm interference ring and quantum key distribution system |
| CN107817967A (en) * | 2017-11-02 | 2018-03-20 | 浙江神州量子网络科技有限公司 | Quantum random number generator based on SFP transceivers |
| CN107817967B (en) * | 2017-11-02 | 2024-04-12 | 浙江神州量子网络科技有限公司 | SFP (Small form-factor pluggable) based integrated quantum random number generator |
| CN110620619A (en) * | 2018-09-18 | 2019-12-27 | 科大国盾量子技术股份有限公司 | Quantum communication system, transmitting end thereof and quantum communication method |
| CN110620619B (en) * | 2018-09-18 | 2022-12-16 | 科大国盾量子技术股份有限公司 | Quantum communication system, transmitting end thereof and quantum communication method |
| CN113324485A (en) * | 2021-05-26 | 2021-08-31 | 国开启科量子技术(北京)有限公司 | Arm length difference measuring system of unequal arm interferometer |
| CN116382012A (en) * | 2023-06-06 | 2023-07-04 | 合肥硅臻芯片技术有限公司 | System and method for generating superposition state of random time-bin quanta |
| CN116382012B (en) * | 2023-06-06 | 2023-08-01 | 合肥硅臻芯片技术有限公司 | System and method for generating superposition state of random time-bin quanta |
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| CN106506096B (en) | 2018-08-07 |
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