CN107979463A - A kind of phase codec and quantum key dispatching system - Google Patents
A kind of phase codec and quantum key dispatching system Download PDFInfo
- Publication number
- CN107979463A CN107979463A CN201810058204.9A CN201810058204A CN107979463A CN 107979463 A CN107979463 A CN 107979463A CN 201810058204 A CN201810058204 A CN 201810058204A CN 107979463 A CN107979463 A CN 107979463A
- Authority
- CN
- China
- Prior art keywords
- light pulse
- phase
- polarization state
- beam splitter
- modulator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
- H04L9/0816—Key establishment, i.e. cryptographic processes or cryptographic protocols whereby a shared secret becomes available to two or more parties, for subsequent use
- H04L9/0852—Quantum cryptography
- H04L9/0858—Details about key distillation or coding, e.g. reconciliation, error correction, privacy amplification, polarisation coding or phase coding
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Theoretical Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The application provides a kind of phase codec and quantum key dispatching system, the phase codec includes Sagnac ring structures, namely round-trip structure is replaced to carry out high-speed phase loading using Sagnac ring structures in the present invention, the component single that two polarizations of same pulse are vertical passes through phase-modulator at the same time, not only there is polarization-stable, and have the advantages that at a high speed, it is efficient.Phase code quantum key dispatching system using the Faraday Sagnac Michelson encoders of the present invention as core, can conveniently realize the secure key distribution of unidirectional high speed, have the advantages that anti-channel polarization scrambling, high into code check.
Description
Technical field
The present invention relates to field of communication technology, more particularly to a kind of phase codec and quantum key dispatching system.
Background technology
Due to the birefringent influence of channel, fiber quantum key distribution system uses phase encoding scheme, the phase of early stage more
Position encoding scheme uses double unequal arm Mach-Zehnder (Mach-Zeng Te) interferometers as basic structure more, but due in quantum
In the sending and receiving device of distribution system, light pulse is undergone the different of double unbalanced Mech-Zehnder interferometers and is done respectively
Arm is related to, causes suffered interference different, causes phase code quantum key dispatching system stability poor, be easily subject to environment to disturb
It is dynamic to influence.
To obtain the quantum key dispatching system of high stability, mainly there are two kinds of solutions at present, one kind is Plug-
And-Play (plug and play) reciprocation type (two-way) phase code quantum key dispatching system, light source and single-photon detector exist
Same channel is passed through in system receiving terminal, the light pulse that light source is sent twice back and forth, since transmitting terminal faraday mirror is by input light
The characteristic that polarization state is rotated by 90 °, the reciprocation type system have fabulous stability.But this reciprocation type system has two
The shortcomings that a obvious, in terms of security, since light source is in system receiving terminal, the transmitting terminal of system first receives light re-encoding hair
Go out, be subject to Trojan attack, security is defective；In terms of system operating rate, since light pulse is back and forth twice by same
One channel, the Qiang Guanghui from receiving terminal to transmitting terminal cause the light of another aspect transmission greatly interference, it is necessary to reduce system
Operating rate and increase optical fiber storage ring reduce interference, at present highest system operating rate only 5MHz.
Another kind is the unidirectional phase code quantum-key distribution system based on unequal arm Faraday-Michelson interferometers
System, quantum signal are transmitted to receiving terminal from transmitting terminal channel, have the security of higher, will not in terms of system operating rate
Limited by the interference of round-trip light.The operating rate of unidirectional phase code quantum key dispatching system this at present has reached
200MHz.But it can not meet operating rate high speed and the dual requirements stablized.
The content of the invention
In view of this, the present invention provides a kind of phase codec and quantum key dispatching system, to solve the prior art
In the unidirectional phase code quantum key dispatching system based on unequal arm Faraday-Michelson interferometers can not meet at a high speed
Operating rate and the problem of stablizing dual requirements.
To achieve the above object, the present invention provides following technical solution：
A kind of phase codec, including：Beam splitter and the first faraday mirror, and Sagnac ring structure；
The beam splitter is used to an incident light pulse being beamed into the first light pulse and the second light pulse；
First faraday mirror is used to reflect first light pulse, and returns to polarization state relative to the described first smooth arteries and veins
Rush the 3rd light pulse being rotated by 90 °；
The Sagnac ring structure is used to second light pulse being decomposed into the first polarization state light pulse and second inclined
Polarization state light pulse, wherein, first polarization state and second polarization state are mutually perpendicular to, and respectively to first polarization state
Light pulse and the second polarization state light pulse loading code phase information, and it is inclined relative to described first to return to polarization state respectively
Two polarization state light pulse signals that polarization state light pulse and the second polarization state light pulse are rotated by 90 °, and will be described two inclined
It is the 4th light pulse that polarization state is rotated by 90 ° relative to second light pulse that polarization state light pulse signal, which closes beam,；
The beam splitter is additionally operable to the 3rd light pulse being divided into two-beam pulse output, and by the 4th smooth arteries and veins
Punching is divided into two-beam pulse output.
Preferably, the Sagnac-ring includes：Three port polarization beam splitters, 90 degree of Faraday rotation pieces and phase-modulation
Device；
The three port polarizations beam splitter includes：Incidence end, reflection end and transmission end, wherein, the reflection end passes through
One optical fiber is connected with one end of the phase-modulator, and the other end of the phase-modulator passes through the second optical fiber and described 90 degree
Faraday rotation piece connects, and 90 degree of Faraday rotation pieces are oppositely arranged with the transmission end；
Second light pulse inputted by the incidence end is decomposed into described first by the three port polarizations beam splitter
Polarization state light pulse and the second polarization state light pulse；
The first polarization state light pulse is exported by the reflection end, by phase-modulator loading encoding phase letter
After breath, polarization state is rotated by 90 ° by 90 degree of Faraday rotation pieces, arrives at the three port polarizations beam splitter by conjunction beam；
The second polarization state light pulse is exported by the transmission end, is rotated by 90 ° by 90 degree of Faraday rotation pieces
Polarization state, then after the phase-modulator loads code phase information, the three port polarizations beam splitter is arrived at by conjunction beam.
Preferably, the length of first optical fiber is identical with the length of second optical fiber.
Preferably, the Sagnac-ring includes：Four port polarization beam splitters, the second faraday mirror and phase-modulator；
The four port polarizations beam splitter includes：Incidence end, the first reflection end, transmission end and the second reflection end；Wherein, institute
State the first reflection end to be connected with one end of the phase-modulator by the first optical fiber, the other end of the phase-modulator passes through
Second optical fiber is connected with second reflection end, and second faraday mirror is oppositely arranged with the transmission end；
Second light pulse inputted by the incidence end is decomposed into described first by the four port polarizations beam splitter
Polarization state light pulse and the second polarization state light pulse；
The first polarization state light pulse is exported by first reflection end, and coding phase is loaded by the phase-modulator
After the information of position, inputted by second reflection end into the four port polarizations beam splitter, be reflected onto described second farad
In mirror, by second faraday mirror 90 degree of secondary reflection and rotatory polarization state again, the four port polarizations beam splitter is arrived at
By conjunction beam；
The second polarization state light pulse is exported by the transmission end, and is reflected and rotated partially by second faraday mirror
After 90 degree of polarization state, then by the four port polarizations beam splitter reflection, exported by second reflection end to the phase-modulator
In carry out loading coding information, arrive at the four port polarizations beam splitter by conjunction beam.
Preferably, the length of first optical fiber is more than the length of second optical fiber, and the first polarization state light arteries and veins
Punching and the second polarization state light pulse reach the phase-modulator at the same time.
The present invention also provides a kind of quantum key dispatching system, including：Optical pulse generator, transmitting terminal, quantum channel, connect
Receiving end, at least one single-photon detector；
Wherein, the optical pulse generator is used to produce light pulse；
The transmitting terminal is used to carry out phase code control to the light pulse, and exports；
The quantum channel is used for transmission the light quantity subsignal from the transmitting terminal, and exports to the receiving terminal；
The receiving terminal is used to receive the light quantity subsignal, and the light quantity subsignal is performed and presses quantum-key distribution
The phase decoding modulation of agreement, exports two light pulse groups, the light pulse that each light pulse group is sent by the transmitting terminal
It is derived；
At least one single-photon detector receives a light pulse group, and to the light arteries and veins in the light pulse group
Punching superposition result of interference is detected, and quantum-key distribution is carried out according to the quantum key distribution protocol；
The transmitting terminal is the phase codec described in any of the above one, and the phase codec is compiled as phase
Code device, for being encoded to the light pulse signal of input；
The receiving terminal is the phase codec described in any of the above one, and the phase codec is used as phase solution
Code device, for being decoded to the light pulse signal of input.
Preferably, the optical pulse generator includes：Quantum light source and intensity modulator；
The quantum light source is used to produce the random light pulse of phase；
The intensity modulator, which is used to perform, inveigles state method, and the light pulse exported to the quantum light source carries out strong at random
Degree modulation, produces the light pulse of varying strength.
Preferably, attenuator is further included between the transmitting terminal and the quantum channel, for being exported to the transmitting terminal
Light pulse decay, to meet the required intensity of the quantum key dispatching system.
Preferably, circulator, the first single-photon detector and the second single-photon detector are further included；
The circulator includes first end, second end and the 3rd end, wherein, the first end connects the quantum channel,
The second end connects the input terminal of the receiving terminal, and the 3rd end is connected with first single-photon detector；
Second single-photon detector connects the output terminal of the receiving terminal.
It can be seen via above technical scheme that phase codec provided by the invention, including beam splitter, the first faraday
Mirror, further includes Sagnac ring structure (Sagnac ring structures), and the beam splitter is used to an incident light pulse being beamed into
First light pulse and the second light pulse；First faraday mirror is used to reflect first light pulse, and returns to polarization state phase
The 3rd light pulse being rotated by 90 ° for first light pulse；The Sagnac ring structure is used for second light pulse
The first polarization state light pulse and the second polarization state light pulse are decomposed into, wherein, first polarization state and second polarization state
It is mutually perpendicular to, and code phase information is loaded to the first polarization state light pulse and the second polarization state light pulse respectively,
And two that polarization state is rotated by 90 ° relative to the first polarization state light pulse and the second polarization state light pulse are returned respectively
A polarization state light pulse signal, and by described two polarization state light pulse signals close beam for polarization state relative to the described second smooth arteries and veins
The 4th light pulse being rotated by 90 ° is rushed, the beam splitter is additionally operable to the 3rd light pulse and the 4th light pulse synthesis,
And export.
First, phase codec provided by the invention is with being based on unequal arm Faraday-Michelson interferometer structures
Encoder there is equivalence, therefore phase codec provided by the invention and the quantum key based on the phase codec
Distribution system inherits Faraday-Michelson encoders and based on Faraday-Michelson encoders quantum key point
The stability characteristic (quality) of match system.
Secondly, relative to Faraday-Michelson encoders of the prior art and based on Faraday-Michelson
Encoder quantum key dispatching system, adds due to using Sagnac ring structures to replace round-trip structure to carry out high-speed phase in the present invention
Carry, two vertical component singles of polarization of same light pulse load code phase information at the same time, equivalent to whole light pulse only
By a phase-modulation, insertion loss reduces, and the receiving terminal as quantum key dispatching system has efficient advantage, namely
Phase codec (namely Faraday-Sagnac-Michelson codecs) provided by the invention and based on the phase
The quantum key dispatching system of codec not only has the characteristics that polarization-stable, and have the advantages that at a high speed, it is efficient.Experiment
As shown by data, the operating rate of quantum key dispatching system provided by the invention can reach more than GHz, relative to the prior art
In the unidirectional phase code quantum key dispatching system based on unequal arm Faraday-Michelson interferometers 200MHz and
Speech, improves at least one order of magnitude.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is attached drawing needed in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
The embodiment of invention, for those of ordinary skill in the art, without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is a kind of structure diagram of phase codec provided in an embodiment of the present invention；
Fig. 2 is the structure diagram of another phase codec provided in an embodiment of the present invention；
Fig. 3 is a kind of structure diagram of quantum key dispatching system provided in an embodiment of the present invention.
Embodiment
Just as described in the background section, exist in the prior art and channel disturbance is immunized, there is higher stability
Phase code quantum key dispatching system, but the system also exist limited be subject to operating rate, can not be in high workload speed
Lower work.
Inventor has found that it is that channel disturbance is immunized in the prior art the reason for above-mentioned phenomenon occur, and with higher steady
The qualitatively unequal arm Faraday-Michelson interferometers of phase code quantum key dispatching system, still, in the system
In, since optical signal respectively once passes through phase-modulator back and forth, based on the demand of phase-modulation precision, generally load in phase tune
Electric signal on device processed remains unchanged so that the original phase code based on unequal arm Faraday-Michelson interferometers
Quantum key dispatching system is limited be subject to high-speed.
Based on this, the present invention provides a kind of phase codec, including：Beam splitter and the first faraday mirror, and Sa lattice
Nanogram ring structure；
The beam splitter is used to an incident light pulse being beamed into the first light pulse and the second light pulse；
First faraday mirror is used to reflect first light pulse, and returns to polarization state relative to the described first smooth arteries and veins
Rush the 3rd light pulse being rotated by 90 °；
The Sagnac ring structure is used to second light pulse being decomposed into the first polarization state light pulse and second inclined
Polarization state light pulse, wherein, first polarization state and second polarization state are mutually perpendicular to, and respectively to first polarization state
Light pulse and the second polarization state light pulse loading code phase information, and it is inclined relative to described first to return to polarization state respectively
Two polarization state light pulse signals that polarization state light pulse and the second polarization state light pulse are rotated by 90 °, and will be described two inclined
It is the 4th light pulse that polarization state is rotated by 90 ° relative to second light pulse that polarization state light pulse signal, which closes beam,；
The beam splitter is additionally operable to the 3rd light pulse being divided into two-beam pulse output, and by the 4th smooth arteries and veins
Punching is divided into two-beam pulse output.
Due to using Sagnac ring structures to replace round-trip structure to carry out high-speed phase loading in the present invention, same light pulse
Two vertical component singles of polarization load code phase information at the same time, equivalent to whole light pulse merely through a phase tune
System, insertion loss reduce, and the receiving terminal as quantum key dispatching system has efficient advantage, namely phase provided by the invention
Position codec (namely Faraday-Sagnac-Michelson codecs) and the quantum based on the phase codec
Key dispatching system not only has the characteristics that polarization-stable, and have the advantages that at a high speed, it is efficient.Experimental data shows, this hair
The operating rate of the quantum key dispatching system of bright offer can reach more than GHz, be based on differing relative to of the prior art
For the 200MHz of the unidirectional phase code quantum key dispatching system of arm Faraday-Michelson interferometers, improve to
Few an order of magnitude.
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without making creative work
Embodiment, belongs to the scope of protection of the invention.
A kind of phase codec provided in an embodiment of the present invention, including beam splitter and the first faraday mirror, further include Sa
Lattice nanogram ring structure；Beam splitter is used to an incident light pulse being beamed into the first light pulse and the second light pulse；First method
Draw mirror be used for reflect the first light pulse, and return to the 3rd light pulse that polarization state is rotated by 90 ° relative to the first light pulse；Sa
Lattice nanogram ring structure is used to the second light pulse being decomposed into the first polarization state light pulse and the second polarization state light pulse, wherein, the
One polarization state and the second polarization state are mutually perpendicular to, and the first polarization state light pulse and the second polarization state light pulse loading are compiled respectively
Code phase information, and return to what polarization state was rotated by 90 ° relative to the first polarization state light pulse and the second polarization state light pulse respectively
Two polarization state light pulse signals, and two polarization state light pulse signals are closed into beam and are rotated for polarization state relative to the second light pulse
90 degree of the 4th light pulse.
It should be noted that the specific internal structure of the Sagnac ring structure is not limited in the embodiment of the present invention, only
It can realize that the Sagnac ring structure of above-mentioned purpose can be with.
For convenience of explanation, the phase codec knot being described with reference to the accompanying drawings in the embodiment of the present invention in the present invention
Structure.It should be noted that codec of the present invention is encoder when being encoded and decoder when being decoded,
In different situations, using difference in functionality, but hardware configuration is identical.
Fig. 1 is referred to, is a kind of structure diagram of phase codec provided in an embodiment of the present invention, as shown in Figure 1,
The phase codec is based on unequal arm Faraday-Sagnac-Michelson interferometers (being abbreviated as FSMI), the phase
Codec includes：Beam splitter (English abbreviation BS) 11, the first faraday mirror (English abbreviation FM) 12 and Sagnac ring structures, such as
Shown in Fig. 1, Sagnac ring structures include in the present embodiment：Three 13,90 degree of port polarization beam splitter (English abbreviation PBS) faraday
Revolving fragment (English abbreviation FR) 14 and phase-modulator (English abbreviation PM) 15.Beam splitter described in the present embodiment is Two In and Two Out
50：50 beam splitters.
Fig. 1 is referred to, three port polarization beam splitters 13 include：Incidence end (upper port in such as Fig. 1), reflection end (such as Fig. 1
In left port) and transmission end (lower port in such as Fig. 1), wherein, reflection end passes through the first optical fiber and phase-modulator 15
One end connects, and the other end of phase-modulator 15 is connected by the second optical fiber with 90 degree of Faraday rotation pieces 14,90 degree of faraday
Revolving fragment 14 and the transmission end of three port polarization beam splitters 13 are oppositely arranged；In Fig. 1, three port polarization beam splitters 13 and 90 degree of methods
Draw revolving fragment 14 to be packaged together, be abbreviated as PBS+FR, the transmission of 14 and three port polarization beam splitter 13 of Faraday rotation piece
End connection.
Three port polarization beam splitters 13 act as in the present embodiment：The second light pulse inputted by incidence end is decomposed into
First polarization state light pulse and the second polarization state light pulse；First polarization state light pulse is exported by reflection end, by phase-modulation
After device 15 loads code phase information, polarization state is rotated by 90 ° by 90 degree of Faraday rotation pieces 14, arrives at three port polarizations point
Beam device 13 is by conjunction beam；Second polarization state light pulse is exported by transmission end, and polarization is rotated by 90 ° by 90 degree of Faraday rotation pieces 14
State, then after phase-modulator 15 loads code phase information, three port polarization beam splitters 13 are arrived at by conjunction beam.
Specifically, the course of work of phase codec is in the present embodiment：
The light pulse of beam splitter 11 is incident to, beam splitter 11, beam splitting are entered by one of input port of beam splitter 11
Incident light pulse is divided into two light pulses along two paths by device 11, subsequently also has the return of relative time delay light path by two
Light pulse synthesis from two-port export.
First light path in above-mentioned two light paths includes the first faraday mirror 12, for by this light path Shang Guangyuan roads
Reflect back, and the polarization state of return light is rotated by 90 ° relative to incident light, the light returned in the light path is the 3rd smooth arteries and veins
Punching.
Article 2 light path in above-mentioned two light paths has Sagnac ring structures, for this light path Shang Guangyuan roads to be returned
Return, be not only loaded with the phase information of coding, but also the polarization state of return light is also rotated by 90 ° relative to incident light.
Specifically, the light of input is divided into the first polarization state light pulse and the second polarization state light pulse in Sagnac rings,
Wherein a branch of light pulse is transmitted in the counterclockwise direction, and in addition a branch of light pulse is transmitted along clockwise direction, unlimited in the present embodiment
It is fixed specifically how to transmit, moreover, the first polarization state light pulse and second that three port polarization beam splitters 13 export in the present embodiment
The polarization state of polarization state light pulse is mutually perpendicular to, for convenience of description, in the present embodiment the first polarization state light pulse be defined as edge
Counterclockwise transmission, and the light pulse that polarization direction vertically polarizes, the second polarization state light pulse are defined as along suitable
Clockwise transmission, and the light pulse that polarization direction polarizes in the horizontal direction.
Wherein, polarization direction is anti-from polarization beam apparatus 13 in the counterclockwise direction for the first polarization state light pulse of vertical direction
End output is penetrated, after first phase modulated device 15 loads encoding phase, then through 90 degree of Faraday rotation pieces 14 becomes horizontal polarization light
Three port polarization beam splitters are arrived at by conjunction beam；
Polarization direction is the second polarization state light pulse of horizontal direction along clockwise direction from three port polarization beam splitters 13
Transmission end output, first become the light polarized vertically through 90 degree Faraday rotation pieces 14, then the loading of phase modulated device 15 encodes
Three port polarization beam splitters are arrived at after phase by conjunction beam.
Finally, the first polarization state light pulse transmitted in the counterclockwise direction and the second polarization state transmitted along clockwise direction
Light pulse forms the 4th light pulse after three port polarization beam splitters close beam, and the polarization state of the 4th light pulse is relative to described
The polarization state of second light pulse is rotated by 90 °, and the 4th light pulse is along backtracking to beam splitter.
3rd light pulse and the 4th light pulse are closed beam under the action of beam splitter 11 and are exported again, wherein, the 3rd light pulse
Polarization state is rotated by 90 ° relative to the polarization state of the first light pulse, and the 4th light pulse is not only loaded with the phase information of coding, and
And the 4th the polarization state of light pulse be also rotated by 90 ° relative to the polarization state of the second light pulse.
It should be noted that not position of the qualification phase modulator in Sagnac rings in the present embodiment, to ensure at a high speed
Phase-modulation effect during modulation, phase-modulator is placed on Sagnac rings centre position, i.e. polarization beam apparatus in the present embodiment
Input light beam splitting is started, to most both direction combiner, the centre of whole light path, namely first optical fiber and second at last
The length of optical fiber is identical.
The phase codec provided in the embodiment of the present invention, inherits of the prior art steady on optical polarization characteristic
It is qualitative, simultaneously as two of the long-armed middle light pulse of unequal arm Faraday-Sagnac-Michelson phase codecs
Divide at the same time by phase-modulator, can easily support the code rate higher than GHz；Moreover, two parts of light pulse are single
It is secondary to pass through phase-modulator, reduce equivalent to whole light pulse merely through a phase-modulator, insertion loss.
A kind of phase codec is provided in another embodiment of the present invention, as shown in Fig. 2, the phase codec bag
Include：Beam splitter (English abbreviation BS) 21, the first faraday mirror (English abbreviation FM) 22 and Sagnac ring structures, as shown in Fig. 2, this
Sagnac ring structures include in embodiment：Four port polarization beam splitters (English abbreviation PBS) 23, (the English letter of the second faraday mirror
Claim FM) 24 and phase-modulator (English abbreviation PM) 25.Beam splitter described in the present embodiment is the 50 of Two In and Two Out：50 beam splitting
Device.
Fig. 2 is referred to, four port polarization beam splitters 23 include：Incidence end (upper port in such as Fig. 2), the first reflection end
(left port in such as Fig. 2), transmission end (lower port in such as Fig. 2) and the second reflection end (right output port in such as Fig. 2)；Wherein,
First reflection end is connected by the first optical fiber with one end of phase-modulator 25, and the other end of phase-modulator 25 passes through the second light
Fibre is connected with the second reflection end, and the second faraday mirror 24 is oppositely arranged with transmission end
Four port polarization beam splitters 23 by the second light pulse inputted by incidence end be decomposed into the first polarization state light pulse and
Second polarization state light pulse；First polarization state light pulse is exported by the first reflection end, and coding phase is loaded by phase-modulator 25
After the information of position, input into four port polarization beam splitters 23, be reflected onto in the second faraday mirror 24 by the second reflection end, pass through
The second faraday mirror 24 90 degree of secondary reflection and rotatory polarization state again are crossed, arrives at four port polarization beam splitters 23 by conjunction beam；Second is inclined
Polarization state light pulse is exported by transmission end, and is reflected and after 90 degree of rotatory polarization state by the second faraday mirror 24, then inclined by four ports
The beam splitter 23 that shakes reflects, and is exported by the second reflection end and loading coding information is carried out into phase-modulator 25, and it is inclined to arrive at four ports
Beam splitter 23 shake by conjunction beam.
Specifically, the course of work of phase codec is in the present embodiment：
The light pulse of beam splitter 21 is incident to, beam splitter 21, beam splitting are entered by one of input port of beam splitter 21
Incident light pulse is divided into two light pulses along two paths by device 21, subsequently also has the return of relative time delay light path by two
Light pulse synthesis from two-port export.
The first faraday mirror 22 in first light path in above-mentioned two light paths is by the light pulse original road in this light path
Reflect back, and the polarization state of return light is rotated by 90 ° relative to incident light, the light returned in the light path is the 3rd smooth arteries and veins
Punching.
Article 2 light path in above-mentioned two light paths has Sagnac ring structures, for this light path Shang Guangyuan roads to be returned
Return, be not only loaded with the phase information of coding, but also the polarization state of return light is also rotated by 90 ° relative to incident light.
Specifically, the light of input is divided into the first polarization state light pulse and the second polarization state light pulse in Sagnac rings,
Wherein a branch of light pulse is transmitted in the counterclockwise direction, and in addition a branch of light pulse is transmitted along clockwise direction, unlimited in the present embodiment
It is fixed specifically how to transmit, moreover, the first polarization state light pulse and second that three port polarization beam splitters 23 export in the present embodiment
The polarization state of polarization state light pulse is mutually perpendicular to, for convenience of description, in the present embodiment the first polarization state light pulse be defined as edge
Counterclockwise transmission, and the light pulse that polarization direction vertically polarizes, the second polarization state light pulse are defined as along suitable
Clockwise transmission, and the light pulse that polarization direction polarizes in the horizontal direction.
Wherein, polarization direction is the first polarization state light pulse of vertical direction in the counterclockwise direction from polarization beam apparatus 23
First reflection end exports, and after first phase modulated device 25 loads encoding phase, continues to be transmitted to the of four port polarization beam splitters
Two reflection ends are reflected again, which is reflected onto in the second faraday mirror 24, by
After the reflection of two faraday mirrors 24, the light for becoming horizontal polarization arrives at four port polarization beam splitters by conjunction beam；
Polarization direction is the second polarization state light pulse of horizontal direction along clockwise direction from four port polarization beam splitters 23
Transmission end output, first reflected by the second faraday mirror 24 after, the light for becoming to polarize vertically is anti-by four port polarization beam splitters 23
Penetrate, exported from its second reflection end, continue to be transmitted to after phase-modulator 25 loads encoding phase and arrive at four port polarization beam splitting
Device is by conjunction beam.
Finally, the first polarization state light pulse transmitted in the counterclockwise direction and the second polarization state transmitted along clockwise direction
Light pulse forms the 4th light pulse after four port polarization beam splitters close beam, and the polarization state of the 4th light pulse is relative to described
The polarization state of second light pulse is rotated by 90 °, and the 4th light pulse is along backtracking to beam splitter.
3rd light pulse and the 4th light pulse again pass by beam splitter 21 respectively, are divided into two light pulses respectively from two
Input port exports.Wherein, the polarization state of the 3rd light pulse is rotated by 90 ° relative to the polarization state of the first light pulse, the 4th smooth arteries and veins
Punching is not only loaded with the phase information of coding, but also the polarization state of the 4th light pulse is also revolved relative to the polarization state of the second light pulse
It turn 90 degrees.
It should be noted that not position of the qualification phase modulator in Sagnac rings in the present embodiment, to ensure at a high speed
Phase-modulation effect during modulation, phase-modulator is placed on Sagnac rings centre position, i.e. polarization beam apparatus in the present embodiment
Input light beam splitting is started, to most two polarization direction combiners, the centre of whole light path, namely the length of the second optical fiber at last
And the length phase of the sum of 2 times of four fiber lengths between port polarization beam splitter and faraday mirror and first optical fiber
Together, refer to shown in the dotted line in Fig. 2, dotted line A is identical with the length of dotted line B so that the first polarization state light pulse and second inclined
Polarization state light pulse reaches the phase-modulator at the same time.
The phase codec provided in the embodiment of the present invention, inherits of the prior art steady on optical polarization characteristic
It is qualitative, simultaneously as two of the long-armed middle light pulse of unequal arm Faraday-Sagnac-Michelson phase codecs
Divide at the same time by phase-modulator, can easily support the code rate higher than GHz；Moreover, two parts of light pulse are single
It is secondary to pass through phase-modulator, reduce equivalent to whole light pulse merely through a phase-modulator, insertion loss.
Based on phase codec recited above, the present invention also provides a kind of quantum key dispatching system, including：Light arteries and veins
Rush generator, transmitting terminal, quantum channel, receiving terminal, at least one single-photon detector；
Wherein, optical pulse generator is used to produce light pulse；Transmitting terminal is used to carry out phase code control to light pulse, and
Output；Quantum channel is used for transmission the light quantity subsignal from transmitting terminal, and exports to receiving terminal；Receiving terminal is used to receive light quantity
Subsignal, and light quantity subsignal is performed and is modulated by the phase decoding of quantum key distribution protocol, two light pulse groups are exported, often
The light pulse that a light pulse group is sent by transmitting terminal is derived；At least one single-photon detector receives a light pulse
Group, and the light pulse superposition result of interference in light pulse group is detected, it is close to carry out quantum according to quantum key distribution protocol
Key distributes；Transmitting terminal is the phase codec in any of the above embodiment, and phase codec is used as phase encoder, is used for
The light pulse signal of input is encoded；Receiving terminal be any of the above embodiment in phase codec, phase encoding and decoding
Device is used as phase decoder, for being decoded to the light pulse signal of input.
It should be noted that the concrete structure of the transmitting terminal and receiving terminal is not limited in the present embodiment.The transmitting terminal
It is based on unequal arm Faraday-Sagnac-Michelson interferometers described in above example with the receiving terminal
(FSMI) encoder or decoder of structure.Transmitting terminal can use three port polarization beam splitters or four ports inclined in the present embodiment
Shake beam splitter, and the receiving terminal can also use three port polarization beam splitters or four port polarization beam splitters, right in the present embodiment
This is not limited, and the combination to transmitting terminal and receiving terminal does not also limit, i.e. transmitting terminal, receiving terminal can use three
Port polarization beam splitter uses four port polarization beam splitters, can also transmitting terminal using three port polarization beam splitters, connect
Receiving end uses four port polarization beam splitters.Or transmitting terminal is inclined using three ports using four port polarization beam splitters, receiving terminal
Shake beam splitter.
In addition, the quantum channel described in the present embodiment can be fiber channel, can also free space channel, this implementation
This is not limited in example.
Three port polarization beam splitters are used with transmitting terminal and receiving terminal below to the quantum-key distribution in the present embodiment
System structure is described in detail.
As shown in figure 3, it is the phase code Fiber quantum using Faraday-Sagnac-Michelson encoders as core
Key dispatching system structure diagram, quantum key dispatching system includes in the present embodiment：The transmission of quantum key dispatching system
The reception device 32 and quantum channel 33 of device 31 and quantum key dispatching system form, quantum channel described in the present embodiment
For fiber channel (fiber channel).
As shown in figure 3, dispensing device 31 includes in the present embodiment：Optical pulse generator 311 and transmitting terminal 312, wherein, light
Impulse generator 311 is used to produce light pulse；Transmitting terminal 312 is used to carry out phase code control to light pulse, and exports.
The concrete structure of the optical pulse generator 311, optionally, light pulse in the present embodiment are not limited in the present embodiment
Generator 311 includes：It is random that quantum light source 311A and intensity modulator (IM) 311B, quantum light source 311A are used to producing phase
Light pulse；Intensity modulator 311B, which is used to perform, inveigles state method, and the light pulse exported to quantum light source 311A carries out strong at random
Degree modulation, produces the light pulse of varying strength.Quantum light source 311A described in the present embodiment is to be operated in turn off gain pattern
Laser (GS-Laser).
In order to enable the intensity for the light pulse signal that dispensing device 31 exports is required most for quantum key dispatching system
Good intensity, dispensing device 31 further includes attenuator (Att) 313 in the present embodiment, and attenuator 313 is located at transmitting terminal 312 and quantum
Between channel 33, the light pulse for being exported to the transmitting terminal decays, to meet the quantum key dispatching system institute
The intensity needed.
The operation principle of dispensing device 31 is：The laser 311A for being operated in turn off gain pattern produces the random light of phase
Pulse, first carries out inveigling the random strength modulation of state method requirement through intensity modulator 311B, subsequently enters Faraday-
Sagnac-Michelson encoders, namely transmitting terminal 312 perform the phase-modulation of quantum key distribution protocol requirement, output tool
There are certain time-delay and identical front and rear two pulse of polarization state, most decay to quantum key dispatching system needs through attenuator 313 afterwards
Suitable strength export to fiber channel 33.
The optical pulse propagation that fiber channel 33 exports is into reception device 32, as shown in figure 3, reception device in the present embodiment
32 include：Receiving terminal 322 and at least one single-photon detector (SPD), receiving terminal 322 are used to receive the transmission of quantum channel 33
Light quantity subsignal, and the light quantity subsignal is performed and is modulated by the phase decoding of quantum key distribution protocol, export two light
Pulse group, the light pulse that each light pulse group is sent by the transmitting terminal are derived；At least one single-photon detecting
Survey device and receive a light pulse group, and the light pulse superposition result of interference in the light pulse group is detected, according to
The quantum key distribution protocol carries out quantum-key distribution.
Detection is superimposed interference effect for convenience in the present embodiment, and reception device 32 further includes circulator in the present embodiment
321st, the first single-photon detector 323A and the second single-photon detector 323B.As shown in figure 3, circulator includes first end, the
Two ends and the 3rd end, wherein, first end connection quantum channel 33, second end connects the input terminal of receiving terminal 322, the 3rd end and the
One single-photon detector 323A is directly connected to；And the second single-photon detector 323B is directly connected to the output terminal of receiving terminal 322.Ring
Correspondence between each port of shape device 321, as shown in the arrow in circulator (CIR) in Fig. 3, first end to second end
Between for can communication path, second end to the 3rd end for can communication path, can not communicate between remaining port, and reversely can not
Communication, i.e., do not have communication path, can not communicate on the direction of second end to first end, the 3rd end is arrived between the 3rd end and first end
It can not also communicate on the direction of second end.
Based on the reception device shown in Fig. 3, its operation principle is：Receive by before and after the next coding of the transmission of fiber channel 33
Two pulses, equal line to second end, enter back into an input terminal of receiving terminal 322, execution amount by the first end of circulator 321
The phase-modulation of sub-key distributorship agreement requirement, former and later two pulses are changed into two respectively again has certain relative time delay and phase
Pulse.Due to the Faraday-Sagnac-Michelson phase encoding and decoding of quantum key dispatching system transmitting terminal and receiving terminal
Utensil has identical delay inequality, and the light pulse that laser produces first exports former and later two pulses through transmitting terminal encoder, this
Received end encoder respectively becomes two pulses with certain time-delay difference again again for two pulses, in point of receiving encoding device
Interfered at beam device, export two groups of light pulses.
Second end of the one of which light pulse through circulator 321 is to the 3rd end, so as to export to the first single-photon detector
323A, another group of light pulse are then directly output to the second single-photon detector 323B.
Finally, according to the output result of the first single-photon detector 323A and the second single-photon detector 323B, transmitting terminal
The phase of coding, the phase of receiving encoding, quantum-key distribution is carried out according to quantum key distribution protocol.
Since the quantum key dispatching system provided in the embodiment of the present invention includes transmitting terminal and receiving terminal, the transmitting terminal
It is based on phase codec (namely the Faraday-Sagnac- provided in above example of the present invention with receiving terminal
Michelson codecs), due to the phase codec in the present invention using Sagnac ring structures instead of the progress of round-trip structure
High-speed phase loads, and two vertical component singles of polarization of same light pulse load code phase information at the same time, equivalent to whole
A light pulse reduces merely through a phase-modulation, insertion loss, and the receiving terminal as quantum key dispatching system has efficient
Advantage, therefore, the quantum key dispatching system also have the advantages that at a high speed, efficiently, stablize.
It should be noted that each embodiment in this specification is described by the way of progressive, each embodiment weight
Point explanation is all difference with other embodiment, between each embodiment identical similar part mutually referring to.
The foregoing description of the disclosed embodiments, enables professional and technical personnel in the field to realize or use the present invention.
A variety of modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, it is of the invention
The embodiments shown herein is not intended to be limited to, and is to fit to and the principles and novel features disclosed herein phase one
The most wide scope caused.
Claims (9)
1. a kind of phase codec, including：Beam splitter and the first faraday mirror, it is characterised in that further include Sagnac-ring
Structure；
The beam splitter is used to an incident light pulse being beamed into the first light pulse and the second light pulse；
First faraday mirror is used to reflect first light pulse, and returns to polarization state and revolved relative to first light pulse
The 3rd light pulse turning 90 degrees；
The Sagnac ring structure is used to second light pulse being decomposed into the first polarization state light pulse and the second polarization state
Light pulse, wherein, first polarization state and second polarization state are mutually perpendicular to, and respectively to the first polarization state light arteries and veins
Punching and the second polarization state light pulse loading code phase information, and polarization state is returned respectively relative to first polarization state
Two polarization state light pulse signals that light pulse and the second polarization state light pulse are rotated by 90 °, and by described two polarization states
It is the 4th light pulse that polarization state is rotated by 90 ° relative to second light pulse that light pulse signal, which closes beam,；
The beam splitter is additionally operable to the 3rd light pulse being divided into two-beam pulse output, and the 4th light pulse is divided
Exported into two-beam pulse.
2. phase codec according to claim 1, it is characterised in that the Sagnac-ring includes：Three ports are inclined
Shake beam splitter, 90 degree of Faraday rotation pieces and phase-modulator；
The three port polarizations beam splitter includes：Incidence end, reflection end and transmission end, wherein, the reflection end passes through the first light
Fine one end with the phase-modulator is connected, and the other end of the phase-modulator passes through the second optical fiber and 90 degree of farads
Revolving fragment connects, and 90 degree of Faraday rotation pieces are oppositely arranged with the transmission end；
Second light pulse inputted by the incidence end is decomposed into first polarization by the three port polarizations beam splitter
State light pulse and the second polarization state light pulse；
The first polarization state light pulse is exported by the reflection end, and code phase information is loaded by the phase-modulator
Afterwards, polarization state is rotated by 90 ° by 90 degree of Faraday rotation pieces, arrives at the three port polarizations beam splitter by conjunction beam；
The second polarization state light pulse is exported by the transmission end, and polarization is rotated by 90 ° by 90 degree of Faraday rotation pieces
State, then after the phase-modulator loads code phase information, the three port polarizations beam splitter is arrived at by conjunction beam.
3. phase codec according to claim 2, it is characterised in that the length of first optical fiber and described second
The length of optical fiber is identical.
4. phase codec according to claim 1, it is characterised in that the Sagnac-ring includes：Four ports are inclined
Shake beam splitter, the second faraday mirror and phase-modulator；
The four port polarizations beam splitter includes：Incidence end, the first reflection end, transmission end and the second reflection end；Wherein, described
One reflection end is connected by the first optical fiber with one end of the phase-modulator, and the other end of the phase-modulator passes through second
Optical fiber is connected with second reflection end, and second faraday mirror is oppositely arranged with the transmission end；
Second light pulse inputted by the incidence end is decomposed into first polarization by the four port polarizations beam splitter
State light pulse and the second polarization state light pulse；
The first polarization state light pulse is exported by first reflection end, by phase-modulator loading encoding phase letter
After breath, inputted by second reflection end into the four port polarizations beam splitter, be reflected onto second faraday mirror
In, by second faraday mirror, 90 degree of secondary reflection and rotatory polarization state, the arrival four port polarizations beam splitter are closed again
Beam；
The second polarization state light pulse is exported by the transmission end, and by second faraday mirror reflection and rotatory polarization state
After 90 degree, then by the four port polarizations beam splitter reflection, by second reflection end export into the phase-modulator into
Row loading coding information, arrives at the four port polarizations beam splitter by conjunction beam.
5. phase codec according to claim 4, it is characterised in that the length of first optical fiber is more than described the
The length of two optical fiber, and the first polarization state light pulse and the second polarization state light pulse reach the phase-modulation at the same time
Device.
6. a kind of quantum key dispatching system, including：It is optical pulse generator, transmitting terminal, quantum channel, receiving terminal, at least one
Single-photon detector；
Wherein, the optical pulse generator is used to produce light pulse；
The transmitting terminal is used to carry out phase code control to the light pulse, and exports；
The quantum channel is used for transmission the light quantity subsignal from the transmitting terminal, and exports to the receiving terminal；
The receiving terminal is used to receive the light quantity subsignal, and the light quantity subsignal is performed and presses quantum key distribution protocol
Phase decoding modulation, export two light pulse groups, the light pulse that each light pulse group is sent by the transmitting terminal derives
；
At least one single-photon detector receives a light pulse group, and the light pulse in the light pulse group is folded
Add result of interference to be detected, quantum-key distribution is carried out according to the quantum key distribution protocol；
It is characterized in that, the transmitting terminal is the phase codec described in claim 1-5 any one, the phase compiles solution
Code device is used as phase encoder, for being encoded to the light pulse signal of input；
The receiving terminal is the phase codec described in claim 1-5 any one, and the phase codec is used as phase
Position decoder, for being decoded to the light pulse signal of input.
7. quantum key dispatching system according to claim 6, it is characterised in that the optical pulse generator includes：Amount
Sub-light source and intensity modulator；
The quantum light source is used to produce the random light pulse of phase；
The intensity modulator, which is used to perform, inveigles state method, and the light pulse to quantum light source output carries out intensity tune at random
System, produces the light pulse of varying strength.
8. quantum key dispatching system according to claim 6, it is characterised in that the transmitting terminal and the quantum channel
Between further include attenuator, the light pulse for being exported to the transmitting terminal decays, to meet the quantum-key distribution
The required intensity of system.
9. quantum key dispatching system according to claim 6, it is characterised in that further include circulator, the first single photon
Detector and the second single-photon detector；
The circulator includes first end, second end and the 3rd end, wherein, the first end connects the quantum channel, described
Second end connects the input terminal of the receiving terminal, and the 3rd end is connected with first single-photon detector；
Second single-photon detector connects the output terminal of the receiving terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810058204.9A CN107979463B (en) | 2018-01-22 | 2018-01-22 | Phase encoder-decoder and quantum key distribution system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810058204.9A CN107979463B (en) | 2018-01-22 | 2018-01-22 | Phase encoder-decoder and quantum key distribution system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107979463A true CN107979463A (en) | 2018-05-01 |
| CN107979463B CN107979463B (en) | 2020-06-26 |
Family
ID=62006170
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810058204.9A Active CN107979463B (en) | 2018-01-22 | 2018-01-22 | Phase encoder-decoder and quantum key distribution system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107979463B (en) |
Cited By (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109039623A (en) * | 2018-10-29 | 2018-12-18 | 中国电子科技集团公司电子科学研究院 | HVDC Modulation quantum key distribution phase decoding method and apparatus and corresponding system |
| CN109039626A (en) * | 2018-10-29 | 2018-12-18 | 中国电子科技集团公司电子科学研究院 | Quantum key distribution time bit-phase decoding method, apparatus and system based on 90 degree of welding difference control |
| CN109039621A (en) * | 2018-10-29 | 2018-12-18 | 中国电子科技集团公司电子科学研究院 | HVDC Modulation quantum key distribution phase decoding method and apparatus and corresponding system |
| CN109120402A (en) * | 2018-10-29 | 2019-01-01 | 中国电子科技集团公司电子科学研究院 | Phase decoding method, apparatus and quantum key distribution system based on polarized orthogonal rotation |
| CN110324145A (en) * | 2019-08-08 | 2019-10-11 | 赵义博 | It is a kind of to polarize unrelated phase code quantum key distribution system and method |
| CN110460432A (en) * | 2019-03-08 | 2019-11-15 | 中国电子科技集团公司电子科学研究院 | Quantum key distribution phase codec, corresponding coding and decoding device and system |
| CN110460431A (en) * | 2019-03-08 | 2019-11-15 | 中国电子科技集团公司电子科学研究院 | Quantum key distribution phase codec, corresponding coding and decoding device and system |
| CN110460429A (en) * | 2019-03-08 | 2019-11-15 | 中国电子科技集团公司电子科学研究院 | Quantum key distribution phase codec, corresponding coding and decoding device and system |
| CN110460430A (en) * | 2019-03-08 | 2019-11-15 | 中国电子科技集团公司电子科学研究院 | Quantum key distribution phase codec, corresponding coding and decoding device and system |
| CN110545180A (en) * | 2019-09-23 | 2019-12-06 | 中国科学技术大学 | Polarization encoding device and quantum key distribution light source |
| WO2020011051A1 (en) * | 2018-07-10 | 2020-01-16 | 科大国盾量子技术股份有限公司 | Sagnac interferometer-based time phase coding device and quantum key distribution system |
| CN110752884A (en) * | 2019-08-19 | 2020-02-04 | 中国电子科技集团公司第三十研究所 | Reciprocal Gaussian modulation quantum optical signal generation device and method |
| WO2020088412A1 (en) * | 2018-10-29 | 2020-05-07 | 中国电子科技集团公司电子科学研究院 | Time bit-phase decoding method and device for quantum key distribution, and corresponding system |
| CN111162905A (en) * | 2020-03-10 | 2020-05-15 | 中国科学技术大学 | Quantum key distribution system and decoding method thereof |
| CN111478767A (en) * | 2019-01-23 | 2020-07-31 | 科大国盾量子技术股份有限公司 | Sending end, encoding method and quantum key distribution system for decoy state encoding and polarization encoding |
| WO2020182055A1 (en) * | 2019-03-08 | 2020-09-17 | 中国电子科技集团公司电子科学研究院 | Quantum key distribution phase encoder/decoder, corresponding encoding/decoding device and system |
| WO2020182059A1 (en) * | 2019-03-08 | 2020-09-17 | 中国电子科技集团公司电子科学研究院 | Quantum key distribution phase encoder/decoder, corresponding encoding/decoding device and system |
| CN112350781A (en) * | 2019-08-06 | 2021-02-09 | 科大国盾量子技术股份有限公司 | Low-voltage-driven high-speed photon quantum state preparation device and method |
| CN112448815A (en) * | 2021-02-01 | 2021-03-05 | 南京邮电大学 | Quantum key distribution device capable of configuring multiple protocols |
| CN112540468A (en) * | 2019-09-20 | 2021-03-23 | 南京大学 | Light polarization control device |
| CN113438077A (en) * | 2021-07-14 | 2021-09-24 | 中国科学技术大学 | Quantum key distribution networking system and quantum key distribution method |
| CN113507361A (en) * | 2021-07-06 | 2021-10-15 | 南京南瑞信息通信科技有限公司 | Quantum key phase modulation system, quantum key distribution system and method |
| CN113872701A (en) * | 2021-12-01 | 2021-12-31 | 北京正道量子科技有限公司 | Time phase coding device and quantum key distribution system |
| CN116527243A (en) * | 2023-03-22 | 2023-08-01 | 南京邮电大学 | Multi-protocol compatible quantum key distribution system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101571612A (en) * | 2004-02-02 | 2009-11-04 | 中国科学技术大学 | Polarization controlling encoding method, encoder and quantum key dispatching system |
| US8385548B2 (en) * | 2009-02-17 | 2013-02-26 | Nucrypt Llc | System and method for entangled photons generation and measurement |
| CN105897413A (en) * | 2016-05-26 | 2016-08-24 | 安徽问天量子科技股份有限公司 | Phase modulation polarization coded QKD system based on sagnac ring |
| US20170281102A1 (en) * | 2016-03-31 | 2017-10-05 | Weng-Dah Ken | Non-contact angle measuring apparatus, mission critical inspection apparatus, non-invasive diagnosis/treatment apparatus, method for filtering matter wave from a composite particle beam, non-invasive measuring apparatus, apparatus for generating a virtual space-time lattice, and fine atomic clock |
| CN107332627A (en) * | 2017-07-24 | 2017-11-07 | 中国科学技术大学 | A kind of unrelated quantum key distribution system of measuring apparatus and method |
-
2018
- 2018-01-22 CN CN201810058204.9A patent/CN107979463B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101571612A (en) * | 2004-02-02 | 2009-11-04 | 中国科学技术大学 | Polarization controlling encoding method, encoder and quantum key dispatching system |
| US8385548B2 (en) * | 2009-02-17 | 2013-02-26 | Nucrypt Llc | System and method for entangled photons generation and measurement |
| US20170281102A1 (en) * | 2016-03-31 | 2017-10-05 | Weng-Dah Ken | Non-contact angle measuring apparatus, mission critical inspection apparatus, non-invasive diagnosis/treatment apparatus, method for filtering matter wave from a composite particle beam, non-invasive measuring apparatus, apparatus for generating a virtual space-time lattice, and fine atomic clock |
| CN105897413A (en) * | 2016-05-26 | 2016-08-24 | 安徽问天量子科技股份有限公司 | Phase modulation polarization coded QKD system based on sagnac ring |
| CN107332627A (en) * | 2017-07-24 | 2017-11-07 | 中国科学技术大学 | A kind of unrelated quantum key distribution system of measuring apparatus and method |
Cited By (39)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020011051A1 (en) * | 2018-07-10 | 2020-01-16 | 科大国盾量子技术股份有限公司 | Sagnac interferometer-based time phase coding device and quantum key distribution system |
| CN109039623A (en) * | 2018-10-29 | 2018-12-18 | 中国电子科技集团公司电子科学研究院 | HVDC Modulation quantum key distribution phase decoding method and apparatus and corresponding system |
| WO2020088412A1 (en) * | 2018-10-29 | 2020-05-07 | 中国电子科技集团公司电子科学研究院 | Time bit-phase decoding method and device for quantum key distribution, and corresponding system |
| CN109039621B (en) * | 2018-10-29 | 2023-05-02 | 中国电子科技集团公司电子科学研究院 | Method, device and corresponding system for decoding direct current modulation quantum key distribution phase |
| CN109039623B (en) * | 2018-10-29 | 2023-05-23 | 中国电子科技集团公司电子科学研究院 | Method and device for decoding direct current modulation quantum key distribution phase and corresponding system |
| CN109039626B (en) * | 2018-10-29 | 2023-05-23 | 中国电子科技集团公司电子科学研究院 | Quantum key distribution time bit-phase decoding method and device controlled by phase difference |
| CN109039621A (en) * | 2018-10-29 | 2018-12-18 | 中国电子科技集团公司电子科学研究院 | HVDC Modulation quantum key distribution phase decoding method and apparatus and corresponding system |
| CN109120402B (en) * | 2018-10-29 | 2023-09-15 | 中国电子科技集团公司电子科学研究院 | Phase decoding method and device based on polarization orthogonal rotation and quantum key distribution system |
| CN109039626A (en) * | 2018-10-29 | 2018-12-18 | 中国电子科技集团公司电子科学研究院 | Quantum key distribution time bit-phase decoding method, apparatus and system based on 90 degree of welding difference control |
| CN109120402A (en) * | 2018-10-29 | 2019-01-01 | 中国电子科技集团公司电子科学研究院 | Phase decoding method, apparatus and quantum key distribution system based on polarized orthogonal rotation |
| CN111478767A (en) * | 2019-01-23 | 2020-07-31 | 科大国盾量子技术股份有限公司 | Sending end, encoding method and quantum key distribution system for decoy state encoding and polarization encoding |
| CN111478767B (en) * | 2019-01-23 | 2022-01-28 | 科大国盾量子技术股份有限公司 | Sending end, encoding method and quantum key distribution system for decoy state encoding and polarization encoding |
| CN110460430A (en) * | 2019-03-08 | 2019-11-15 | 中国电子科技集团公司电子科学研究院 | Quantum key distribution phase codec, corresponding coding and decoding device and system |
| CN110460429A (en) * | 2019-03-08 | 2019-11-15 | 中国电子科技集团公司电子科学研究院 | Quantum key distribution phase codec, corresponding coding and decoding device and system |
| WO2020182055A1 (en) * | 2019-03-08 | 2020-09-17 | 中国电子科技集团公司电子科学研究院 | Quantum key distribution phase encoder/decoder, corresponding encoding/decoding device and system |
| CN110460432A (en) * | 2019-03-08 | 2019-11-15 | 中国电子科技集团公司电子科学研究院 | Quantum key distribution phase codec, corresponding coding and decoding device and system |
| WO2020182059A1 (en) * | 2019-03-08 | 2020-09-17 | 中国电子科技集团公司电子科学研究院 | Quantum key distribution phase encoder/decoder, corresponding encoding/decoding device and system |
| CN110460431A (en) * | 2019-03-08 | 2019-11-15 | 中国电子科技集团公司电子科学研究院 | Quantum key distribution phase codec, corresponding coding and decoding device and system |
| CN112350781B (en) * | 2019-08-06 | 2022-02-11 | 科大国盾量子技术股份有限公司 | Low-voltage-driven high-speed photon quantum state preparation device and method |
| CN112350781A (en) * | 2019-08-06 | 2021-02-09 | 科大国盾量子技术股份有限公司 | Low-voltage-driven high-speed photon quantum state preparation device and method |
| CN110324145A (en) * | 2019-08-08 | 2019-10-11 | 赵义博 | It is a kind of to polarize unrelated phase code quantum key distribution system and method |
| CN110752884B (en) * | 2019-08-19 | 2022-03-15 | 中国电子科技集团公司第三十研究所 | Reciprocal Gaussian modulation quantum optical signal generation device and method |
| CN110752884A (en) * | 2019-08-19 | 2020-02-04 | 中国电子科技集团公司第三十研究所 | Reciprocal Gaussian modulation quantum optical signal generation device and method |
| CN112540468A (en) * | 2019-09-20 | 2021-03-23 | 南京大学 | Light polarization control device |
| CN110545180A (en) * | 2019-09-23 | 2019-12-06 | 中国科学技术大学 | Polarization encoding device and quantum key distribution light source |
| CN111162905B (en) * | 2020-03-10 | 2021-03-09 | 中国科学技术大学 | Quantum key distribution system and decoding method thereof |
| CN111162905A (en) * | 2020-03-10 | 2020-05-15 | 中国科学技术大学 | Quantum key distribution system and decoding method thereof |
| CN112448815A (en) * | 2021-02-01 | 2021-03-05 | 南京邮电大学 | Quantum key distribution device capable of configuring multiple protocols |
| US20220247557A1 (en) * | 2021-02-01 | 2022-08-04 | Nanjing University Of Posts And Telecommunications | Quantum key distribution device capable of being configured with multiple protocols |
| US11522689B2 (en) * | 2021-02-01 | 2022-12-06 | Nanjing University Of Posts And Telecommunications | Quantum key distribution device capable of being configured with multiple protocols |
| CN112448815B (en) * | 2021-02-01 | 2021-07-16 | 南京邮电大学 | Quantum key distribution device capable of configuring multiple protocols |
| CN113507361A (en) * | 2021-07-06 | 2021-10-15 | 南京南瑞信息通信科技有限公司 | Quantum key phase modulation system, quantum key distribution system and method |
| CN113507361B (en) * | 2021-07-06 | 2023-05-26 | 南京南瑞信息通信科技有限公司 | Quantum key phase modulation system, quantum key distribution system and method |
| CN113438077B (en) * | 2021-07-14 | 2022-07-15 | 中国科学技术大学 | Quantum key distribution networking system and quantum key distribution method |
| CN113438077A (en) * | 2021-07-14 | 2021-09-24 | 中国科学技术大学 | Quantum key distribution networking system and quantum key distribution method |
| CN113872701B (en) * | 2021-12-01 | 2022-02-22 | 北京正道量子科技有限公司 | Time phase coding device and quantum key distribution system |
| CN113872701A (en) * | 2021-12-01 | 2021-12-31 | 北京正道量子科技有限公司 | Time phase coding device and quantum key distribution system |
| CN116527243A (en) * | 2023-03-22 | 2023-08-01 | 南京邮电大学 | Multi-protocol compatible quantum key distribution system |
| CN116527243B (en) * | 2023-03-22 | 2024-01-30 | 南京邮电大学 | Multi-protocol compatible quantum key distribution system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107979463B (en) | 2020-06-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107979463A (en) | A kind of phase codec and quantum key dispatching system | |
| CN107612690B (en) | Phase decoding method and device and quantum key distribution system | |
| WO2018214888A1 (en) | Polarization and phase entangled coding method and apparatus, and quantum key distribution system | |
| US6188768B1 (en) | Autocompensating quantum cryptographic key distribution system based on polarization splitting of light | |
| CN106161009B (en) | Quantum key distribution system based on time-phase encoding | |
| CN113676323B (en) | Irrelevant quantum key distribution system of polarization encoding measuring equipment | |
| CN109104277B (en) | Method, device and corresponding system for decoding direct current modulation quantum key distribution phase | |
| CN109150522B (en) | Quantum key distribution time bit-phase decoding method and device and corresponding system | |
| CN110324145A (en) | It is a kind of to polarize unrelated phase code quantum key distribution system and method | |
| WO2005076517A1 (en) | A polarisation-controlled encoding method, encoder and quantum key distribution system | |
| CN109039617A (en) | Quantum key distribution time bit-phase decoding method and apparatus and corresponding system | |
| CN113708932B (en) | Phase encoding device for quantum key distribution and quantum key distribution system | |
| WO2021128557A1 (en) | Quantum communication optical path system and quantum communication method | |
| CN101150371A (en) | A quanta secret key distribution system for phase coding polarization detection | |
| CN110601839A (en) | Quantum key distribution system for polarization and phase composite coding | |
| US11923909B1 (en) | Self-coherent receiver based on polarization-independent delay interferometers | |
| CN110620663A (en) | Quantum key distribution system for polarization and phase composite coding | |
| CN112039671A (en) | Efficient quantum key distribution system and method | |
| US7221812B2 (en) | Compact optics assembly for a QKD station | |
| CN107171793A (en) | From the unrelated CV QKD systems of the measuring apparatus of steady phase and method | |
| CN210629516U (en) | Quantum key distribution system for polarization and phase composite coding | |
| CN210244338U (en) | Quantum random number generating device | |
| CN210143013U (en) | Time phase decoding device and quantum key distribution system including the same | |
| CN209356769U (en) | Polarize unrelated two-beam interference device | |
| CN114650133B (en) | Polarization encoding device for quantum key distribution and quantum key distribution system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |