CN107332627B - A kind of unrelated quantum key distribution system of measuring device and method - Google Patents
A kind of unrelated quantum key distribution system of measuring device and method Download PDFInfo
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- CN107332627B CN107332627B CN201710606950.2A CN201710606950A CN107332627B CN 107332627 B CN107332627 B CN 107332627B CN 201710606950 A CN201710606950 A CN 201710606950A CN 107332627 B CN107332627 B CN 107332627B
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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
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/614—Coherent receivers comprising one or more polarization beam splitters, e.g. polarization multiplexed [PolMux] X-PSK coherent receivers, polarization diversity heterodyne coherent receivers
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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
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/616—Details of the electronic signal processing in coherent optical receivers
- H04B10/6162—Compensation of polarization related effects, e.g., PMD, PDL
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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
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/69—Electrical arrangements in the receiver
- H04B10/691—Arrangements for optimizing the photodetector in the receiver
- H04B10/6911—Photodiode bias control, e.g. for compensating temperature variations
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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
- H04L9/0819—Key transport or distribution, i.e. key establishment techniques where one party creates or otherwise obtains a secret value, and securely transfers it to the other(s)
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- 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
- 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
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- Optics & Photonics (AREA)
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- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
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Abstract
The application provides a kind of measuring device unrelated quantum key method and system, the polarization state of light pulse signal or light quantity subsignal disturb partially by preparing transmitting terminal in quantum state, the polarization state of the light pulse signal or light quantity subsignal is set to be evenly distributed on the surface of Poincare sphere, then two-way carries out Bell's state projection measurement by independent fibre channel transmission to measurement end respectively by disturbing the light pulse signal operated partially or light quantity subsignal.Two orthogonal polarized components are first separated into the every road light quantity subsignal of measurement end, and the polarization direction difference of orthogonal polarized component is identical in two-way, and then the identical polarized component in polarization direction carries out Bell's state projection measurement respectively.
Description
Technical field
The invention belongs to optical transport private communication technology fields, and in particular to a kind of unrelated quantum key distribution of measuring device
System and method.
Background technique
Quantum key distribution (Quantum Key Distribution) technology is based on quantum physics principle, can be realized letter
The key that breath discusses unconditional security in meaning is shared.However, since there are non-ideal characteristic, quantum keys for practical devices and equipment
There is a certain distance between the physical security and theoretical protocol safety of dissemination system.Distribute as regular quantum-key
The core component of system reception device, single-photon detector become the part for being most susceptible to attack, it is close to have seriously affected quantum
The practical efficiency of key dissemination system.
Unrelated (Measurement Device Independent) the quantum key distribution agreement of measuring device utilizes Bell
State (Bell state) projection measurement is perfect by practical totality problem caused by measuring device (especially single-photon detector)
Ground solves.In measuring device independent protocol, legal communicating pair (referred to as Alice and Bob) is quantum state preparation hair
The side of sending, the light quantum state of preparation is sent to third party (referred to as Charlie) and carries out Bell's state projection measurement, selected by them
Bell's state out, whole process, which is equivalent to, allows legal communicating pair to have shared entangled photon pairs, and further shares peace
Full key.The unrelated quantum key distribution agreement of measuring device is the agreement of tangling based on time reversal, safety and third party
It is unrelated, it can even is that listener-in (referred to as Eve) as the third party for carrying out Bell's state projection measurement, i.e. the unrelated amount of measuring device
All measurement end loopholes of the quantum key distribution agreement innate immunity and attack.
But in actual fiber route, the birefringence effect of fiber channel may be interfered by sev-eral environmental and is affected,
And it is accumulated as distance increases.For example, additional mechanical stress change can be to the polarization of the optical signal wherein transmitted on optical cable
Characteristic variations have an impact.In the aerial optical cable of 180 kms, optical cable can generate swing by wind, and polarization state has at this time
It is faster than the variation of 1Hz, the Strength Changes amount of a certain polarized component is likely to be breached 50% in extreme circumstances.
Because the transmission characteristic of fiber channel brings disturbance that will limit the unrelated quantum key distribution of measuring device with environmental change
The application value of agreement can not obtain the practical unrelated quantum key distribution system of measuring device.
Summary of the invention
In view of this, the present invention provides a kind of measuring device unrelated quantum key system and method, to solve the prior art
The unrelated quantum key distribution system of middle measuring device can not resist stronger environmental disturbances, the poor problem of practicability.
To achieve the above object, the invention provides the following technical scheme:
A kind of unrelated quantum key distribution system of measuring device, comprising:
First quantum state prepares transmitting terminal, the second quantum state prepares transmitting terminal and measurement end；
First quantum state prepares transmitting terminal and is connect with the measurement end by the first fiber channel；
Second quantum state prepares transmitting terminal and is connect with the measurement end by the second fiber channel；
First quantum state prepares transmitting terminal and second quantum state, and to prepare sending end structure identical, includes:
Light source, light quantum state preparation facilities, disturbs deflection device and adjustable attenuator at intensity modulator；
The deflection device of disturbing makes the light pulse for disturb partially to the polarization state of light pulse signal or light quantity subsignal
The polarization state of signal or light quantity subsignal is evenly distributed on the surface of Poincare sphere；
The output end of the adjustable attenuator prepares the output end of transmitting terminal as quantum state, by the light quantity after light intensity attenuation
Subsignal is exported to fiber channel；
The measurement end includes:
First polarization beam apparatus, the second polarization beam apparatus, first Bell's state projection measuring device and the projection of second Bell's state
Measuring device, the first Bell state projection measuring device and the second Bell state projection measuring device include a polarization-maintaining
Beam splitter and two single-photon detectors；
The light quantum Signal separator that first polarization beam apparatus is used to be inputted by first fiber channel is at polarization
Direction mutually orthogonal the first polarized component and the second polarized component；
The light quantum Signal separator that second polarization beam apparatus is used to be inputted by second fiber channel is at polarization
Direction mutually orthogonal third polarized component and the 4th polarized component；
The polarization direction of first polarized component is identical as the polarization direction of the third polarized component, and described second partially
The polarization direction of vibration component is identical as the polarization direction of the 4th polarized component；
The first Bell state projection measuring device is for measuring first polarized component and the third polarized component
Bell's state；
The second Bell state projection measuring device is for measuring second polarized component and the 4th polarized component
Bell's state.
The present invention provides a kind of measuring device unrelated quantum key delivering method, be applied to measuring device recited above without
Quantum key distribution system is closed, the unrelated quantum key delivering method of the measuring device includes:
Prepare the first light quantity subsignal and the second light quantity subsignal；
The first light quantity subsignal and the second light quantity subsignal are carried out disturbing inclined operation, so that first light quantity
The polarization state of subsignal and the second light quantity subsignal is evenly distributed on the surface of Poincare sphere；
Respectively will through disturbing the first light quantity subsignal to the rear by the first fibre channel transmission and will through disturbing it is to the rear
Second light quantity subsignal passes through the second fibre channel transmission；
By described by disturbing the first light quantum Signal separator to the rear first polarized component mutually orthogonal for polarization direction
With the second polarized component；
By described by disturbing the second light quantum Signal separator to the rear third polarized component mutually orthogonal for polarization direction
With the 4th polarized component；Wherein, the polarization direction phase of the polarization direction of first polarized component and the third polarized component
Together, the polarization direction of second polarized component is identical as the polarization direction of the 4th polarized component；
Measure first polarized component and the third polarized component Bell's state and second polarized component and
Bell's state of 4th polarized component.
The present invention provides another measuring device unrelated quantum key distribution system, comprising:
First quantum state prepares transmitting terminal, the second quantum state prepares transmitting terminal and measurement end；
First quantum state prepares transmitting terminal and is connect with the measurement end by the first fiber channel；
Second quantum state prepares transmitting terminal and is connect with the measurement end by the second fiber channel；
First quantum state prepares transmitting terminal and second quantum state, and to prepare sending end structure identical, includes:
Light source, light quantum state preparation facilities, disturbs deflection device and adjustable attenuator at intensity modulator；
The deflection device of disturbing makes the light pulse for disturb partially to the polarization state of light pulse signal or light quantity subsignal
The polarization state of signal or light quantity subsignal is evenly distributed on the surface of Poincare sphere；
The output end of the adjustable attenuator prepares the output end of transmitting terminal as quantum state, by the light quantity after light intensity attenuation
Subsignal is exported to fiber channel；
The measurement end includes:
Third polarization beam apparatus, the 4th polarization beam apparatus, the 5th polarization beam apparatus and the 6th polarization beam apparatus and the shellfish
That state projection measuring device, Bell's state projection measuring device include a polarization-maintaining beam splitter and two single-photon detectors；
The light quantum Signal separator that the third polarization beam apparatus is used to be inputted by first fiber channel is at polarization
Direction mutually orthogonal the 5th polarized component and the 6th polarized component；
The light quantum Signal separator that 4th polarization beam apparatus is used to be inputted by second fiber channel is at polarization
Direction mutually orthogonal the 7th polarized component and the 8th polarized component；
The polarization direction of 5th polarized component is identical as the polarization direction of the 7th polarized component, and the described 6th partially
The polarization direction of vibration component is identical as the polarization direction of the 8th polarized component；
One input terminal of one output end of the third polarization beam apparatus and the 5th polarization beam apparatus passes through the
The connection of one time delay optical fiber, first time delay optical fiber transmit the 5th polarized component for being delayed；
One input terminal of one output end of the 4th polarization beam apparatus and the 6th polarization beam apparatus passes through the
The connection of two time delay optical fibers, second time delay optical fiber transmit the 7th polarized component, the 5th polarized component for being delayed
It is identical with the delay time of the 7th polarized component；
5th polarization beam apparatus be used for will be delayed after the 5th polarized component and the 6th polarized component close
Beam obtains the first conjunction beam；
6th polarization beam apparatus be used for will be delayed after the 7th polarized component and the 8th polarized component close
Beam obtains the second conjunction beam；
Bell's state projection measuring device measures the difference in the first conjunction beam and the second conjunction beam for timesharing
Bell's state of polarized component.
Accordingly, the present invention provides a kind of measuring device unrelated quantum key delivering method, is applied to survey recited above
Measure the unrelated quantum key distribution system of equipment, the unrelated quantum key delivering method of the measuring device includes:
Prepare the first light quantity subsignal and the second light quantity subsignal；
The first light quantity subsignal and the second light quantity subsignal are carried out disturbing inclined operation, so that first light quantity
The polarization state of subsignal and the second light quantity subsignal is evenly distributed on the surface of Poincare sphere；
Respectively will through disturbing the first light quantity subsignal to the rear by the first fibre channel transmission and will through disturbing it is to the rear
Second light quantity subsignal passes through the second fibre channel transmission；
By described by disturbing the first light quantum Signal separator to the rear 5th polarized component mutually orthogonal for polarization direction
With the 6th polarized component；
By described by disturbing the second light quantum Signal separator to the rear 7th polarized component mutually orthogonal for polarization direction
With the 8th polarized component；Wherein, the polarization direction of the 5th polarized component and the polarization direction phase of the 7th polarized component
Together, the polarization direction of the 6th polarized component is identical as the polarization direction of the 8th polarized component；
Five polarized component that is delayed and the 7th polarized component same time；
By after delay the 5th polarized component and the 6th polarized component carry out conjunction beam, obtain the first conjunction beam, and will
The 7th polarized component and the 8th polarized component after delay carry out conjunction beam, obtain the second conjunction beam；
The described first Bell's state for closing beam and the different polarization component in the second conjunction beam is measured respectively.
It can be seen via above technical scheme that in the unrelated quantum key method of measuring device provided by the invention, in quantum
State prepares transmitting terminal and disturb partially to the polarization state of light pulse signal or light quantity subsignal, makes the light pulse signal or light quantum
The polarization state of signal is evenly distributed on the surface of Poincare sphere, and then two-way is by disturbing the light pulse signal or light quantum operated partially
Signal carries out Bell's state projection measurement by independent fibre channel transmission to measurement end respectively.In the every road light quantum letter of measurement end
Number first it is separated into two orthogonal polarized components, the polarization direction difference of orthogonal polarized component is identical in two-way, then partially
The identical polarized component in vibration direction carries out Bell's state projection measurement respectively.
Polarization state due to entering the light quantity subsignal of fiber channel is evenly distributed on the surface of Poincare sphere, environmental factor
Caused by channel polarization scrambling it acted on cancel out each other.And in measurement end, pass through first polarization separation Bell's state projection measurement again
Mode, ensure that the full same sex of projection measurement light quantum signal polarization characteristic, Bell's state projection measurement stablized, is quasi-
Really carry out.
Since the unrelated quantum key distribution system of measuring device needs polarization recovery and compensating module in the prior art, not only
Increase system complexity, reduces efficiency of transmission, and the number of disadvantages such as security risk can be brought.Provided by the present invention for realizing
In the unrelated quantum key distribution system of the measuring device of the above method, it is only necessary to prepare transmitting terminal in quantum state and increase disturbance device i.e.
Can, the polarization calibration of measurement end in the prior art and compensation device can be removed, so that the unrelated quantum key of measuring device
Dissemination system is immune to channel polarization scrambling, and measurement end enables key distribution procedure without carrying out polarization calibration and compensation
Stablize, efficiently carry out.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is 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 the unrelated quantum key distribution system structural schematic diagram of measuring device in the prior art；
Fig. 2 is a kind of unrelated quantum key distribution system structural schematic diagram of measuring device provided in an embodiment of the present invention；
Fig. 3 is a kind of unrelated quantum key delivering method flow chart of measuring device provided in an embodiment of the present invention；
Fig. 4 is a kind of measurement end structural representation of Bell's state projection measuring device that is time-multiplexed provided in an embodiment of the present invention
Figure；
Fig. 5 is the unrelated quantum key delivering method flow chart of another measuring device provided in an embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
In the prior art, practical when realizing the unrelated quantum key distribution agreement of measuring device, carry out Bell's state projection measurement
It is required that the light quantity subsignal for reaching measurement end has a full same sex, i.e., the light quantity subsignal of long-range legitimate correspondence both sides wavelength, when
Between and polarization characteristic on undistinguishable.For the undistinguishable of light quantum signal wavelength, the essence to laser temperature can be passed through
Close control is to realize；For the undistinguishable of light quantum signal time, can be realized by accurate time delay and tracking.
And to guarantee the undistinguishable of light quantum signal polarization characteristic, it generally requires to the light quantity subsignal for being incident on third party's measurement end
Carry out polarization calibration and compensation.
As shown in Figure 1, needing polarization recovery and the unrelated quantum key of the measuring device of compensation for routine in the prior art
Dissemination system structural schematic diagram.Legal communicating pair (referred to as Alice and Bob) is that quantum state prepares transmitting terminal, they will
The light quantum state of preparation is sent to third party (referred to as Charlie) and carries out Bell's state projection measurement, the shellfish chosen after obtaining
That state, and further share security key.
Alice and Bob prepares sender as quantum state, and system structure is just the same.With the structure of sender Alice
For, mainly by 04 group of light source 01, intensity modulator (IM) 02, light quantum state preparation facilities 03 and adjustable attenuator (VA)
At.
Light source 01 issues the light pulse signal of phase randomization, is randomly modulated into trick state by intensity modulator (IM) 02
One of method intensity subsequently enters light quantum state preparation facilities 03, prepares correspondence according to key and the information for preparing base
Light quantity subsignal, light quantity subsignal decays to after optimal light energy output to fiber channel by adjustable attenuator (VA) 04.
The light quantity subsignal that Alice and Bob preparation is sent enters the end third party Charlie, carries out Bell's state projection measurement
Polarization recovery and compensation are first carried out by corresponding polarization calibration compensation device 05 before 06, so that inputing to Bell's state projection measurement dress
The two-way light quantum signal polarization set is the same.Bell's state projection measuring device 06 at the end Charlie is by a beam splitter 061 and two
A single-photon detector (0621 and 0622) composition, it is dry that HOM occurs at beam splitter 061 for the consistent light quantity subsignal of two-way polarization
(Hong-Ou-Mandel interference) is related to, the optical signal after interference is detected by single-photon detector, according to single-photon detecting
Corresponding Bell's state is selected after surveying the detection result of device.
Legal communicating pair Alice and Bob is according to Bell's state projection measurement result of Charlie and respective key and system
The information of standby base, can share security key, and Charlie only has Bell's state projection measurement result can not obtain key information.
When the transmission characteristic of fiber channel brings disturbance with environmental change, it will lead to measurement end and need to design complexity quickly
Polarization calibration and compensation system.On the one hand the complexity for increasing the unrelated quantum key distribution system of measuring device, reduces
Efficiency of transmission, if environmental change acutely causes polarization compensation that can not keep up with, communicating pair just can not shared key；On the other hand
Security risk may be brought, so that stolen hearer utilizes.It is close that the factor of these two aspects will all limit the unrelated quantum of measuring device
The application value of key distribution protocol can not obtain the practical unrelated quantum key distribution system of measuring device.
Stronger environmental disturbances can not be resisted for the unrelated quantum key distribution system of current measuring device, practicability is poor
Disadvantage, the present invention provide a kind of unrelated quantum key method and system of measuring device that can resist channel polarization scrambling.The party
Method eliminates influence of the channel polarization scrambling to Bell's state projection measurement from principle, and the phase code realized based on this method
Measuring device system without interaction is immune to channel polarization scrambling, even if stable peace still can be generated under exceedingly odious environment
Full key.
Specifically, as shown in Fig. 2, being a kind of unrelated quantum key distribution system of measuring device provided in an embodiment of the present invention
Structural schematic diagram.The unrelated quantum key distribution system of the measuring device, comprising: the first quantum state prepares transmitting terminal 21, second
Quantum state prepares transmitting terminal 22 and measurement end 23；First quantum state prepares transmitting terminal 21 and measurement end 23 and passes through the first fiber channel
Connection；Second quantum state prepares transmitting terminal 22 and is connect with measurement end 23 by the second fiber channel, for convenience of description, the present embodiment
In also by the first quantum state prepare transmitting terminal 21 be referred to as Alice；Second quantum state prepares transmitting terminal 22 and is referred to as Bob, measurement end 23
Referred to as Charlie.
First quantum state prepares transmitting terminal 21 and the second quantum state, and to prepare 22 structure of transmitting terminal identical, in the present embodiment only with
One of them is described, and as shown in Figure 2, it includes: light source 211, intensity modulator 212, light that quantum state, which prepares transmitting terminal 21,
Quantum state preparation facilities 213 disturbs deflection device 214 and adjustable attenuator 215；Deflection device 214 is disturbed for light pulse signal or light
The polarization state of quantum signal disturb partially, and light pulse signal or the polarization state of light quantity subsignal is made to be evenly distributed on Poincare sphere
Surface；The output end of adjustable attenuator 215 prepares the output end of transmitting terminal 21 as quantum state, by the light quantum after light intensity attenuation
Signal is exported to fiber channel；Wherein, the light quantity subsignal that the first quantum state prepares transmitting terminal 21 is exported to the first fiber channel,
The light quantity subsignal that second quantum state prepares transmitting terminal 22 is exported to the second fiber channel.
It is compared from Fig. 2 and Fig. 1, it is known that quantum state prepares transmitting terminal and increases only one and disturbs in the embodiment of the present invention
Deflection device.It should be noted that the specific location and concrete type for disturbing deflection device is not limited in the present embodiment, as long as can
So that disturb partially to the polarization state of light pulse signal or light quantity subsignal, make the polarization state of light pulse signal or light quantity subsignal
It is evenly distributed on the surface of Poincare sphere.
As shown in Figure 2, optional in the present embodiment, it disturbs deflection device 214 and is located at light quantum state preparation facilities 213 and adjustable
Between attenuator 215, carry out disturbing inclined behaviour so as to make to disturb the light quantity subsignal that deflection device prepares light quantum state preparation facilities
Make, inclined effect is preferably disturbed in performance.It should be noted that disturbing deflection device 214 when light quantum state preparation facilities is that polarization is unrelated
It can also be placed between light quantum state preparation facilities 213 and intensity modulator (IM) 212, i.e. light source 211, intensity modulator
212, deflection device 214, light quantum state preparation facilities 213 and adjustable attenuator 215 is disturbed to be sequentially connected.
It is optional in the present embodiment about the concrete type for disturbing deflection device, it disturbs deflection device and can be and actively disturb deflection device,
It can be and passively disturb deflection device, can also be that actively disturbing deflection device disturbs deflection device with the combination for passively disturbing deflection device.In view of quantum
Quantum state in key distribution system prepare transmitting terminal intensity fix and can not the intermediate characteristic amplified, disturb the rate of deflection device simultaneously
It does not need quickly, the even lower rate of kHz can meet demand.In the unrelated quantum key distribution system of measuring device, to protect
Hinder the effect of Bell's state projection measurement, the temporal coherence that quantum state prepares transmitting terminal light quantity subsignal is preferable, reaches preferable
Running effect disturbs deflection device and preferably actively disturbs deflection device and disturbs deflection device with passively disturbing the combination that deflection device combines.
Measurement end 23 includes: the first polarization beam apparatus 231, the second polarization beam apparatus 232, first Bell's state in the present embodiment
Projection measuring device 233 and second Bell's state projection measuring device 234, first Bell's state projection measuring device 233 and the second shellfish
Your state projection measuring device 234 includes a polarization-maintaining beam splitter and two single-photon detectors；First polarization beam apparatus 231 is used
In the first polarized component and second that the light quantum Signal separator that will be inputted by the first fiber channel is mutually orthogonal at polarization direction
Polarized component；The light quantum Signal separator that second polarization beam apparatus 232 is used to be inputted by the second fiber channel is at polarization direction
Mutually orthogonal third polarized component and the 4th polarized component；The polarization direction of first polarized component is inclined with third polarized component
Shaking, direction is identical, and the polarization direction of the second polarized component is identical as the polarization direction of the 4th polarized component；The projection of first Bell's state
Measuring device 233 is used to measure Bell's state of the first polarized component and third polarized component；Second Bell's state projection measuring device
234 for measuring Bell's state of the second polarized component and the 4th polarized component.
For purposes of illustration only, using the polarization direction of the first polarized component and third polarized component as horizontal polarization in the present embodiment
The polarization direction of component, the second polarized component and the 4th polarized component is is illustrated for vertical polarized component, but the present invention
In to this and without limitation, as long as the direction of two polarized components after the same light quantum Signal separator is orthogonal, by the first light
The light quantity subsignal and the polarization direction phase of the polarized component of the light quantity subsignal inputted by the second fiber channel of fine channel input
With.
As shown in Figure 2, polarization recovery compensation device, instead polarization point are no longer needed in system of the invention
Beam device (Polarization Beam Splitter, PBS), by the light quantum Signal separator by fiber channel input at two
A orthogonal polarized component.Wherein, two-way horizontal polarisation component enters Bell's state projection measuring device progress Bell's state throwing
Shadow measurement, the vertical polarized component of two-way enter another Bell's state projection measuring device and carry out Bell's state projection measurement.
Since measurement end 23 does not have polarization recovery compensation device, HOM in Bell's state projection measuring device in the present embodiment
Beam splitter needed for interference must be polarization-maintaining beam splitter, and the optical fiber between polarization beam apparatus and polarization-maintaining beam splitter is polarization-maintaining light
It is fine.That is between the polarization-maintaining beam splitter in the first polarization beam apparatus and first Bell's state projection measuring device and the second polarization divides
It is polarization maintaining optical fibre connection between polarization-maintaining beam splitter in beam device and second Bell's state projection measuring device.
Based on the unrelated quantum key distribution system of above-mentioned measuring device, the embodiment of the invention provides a kind of measuring device without
Quantum key delivering method is closed, as shown in Figure 3, comprising:
S101: the first light quantity subsignal of preparation and the second light quantity subsignal；
S102: carrying out disturbing inclined operation to the first light quantity subsignal and the second light quantity subsignal, so that described
The polarization state of one light quantity subsignal and the second light quantity subsignal is evenly distributed on the surface of Poincare sphere；
S103: respectively by through disturbing the first light quantity subsignal to the rear by the first fibre channel transmission and will through disturbing partially
The second light quantity subsignal afterwards passes through the second fibre channel transmission；
S104: will be the first mutually orthogonal polarized component of polarization direction by disturbing the first light quantum Signal separator to the rear
With the second polarized component；
S105: will be the mutually orthogonal third polarized component in polarization direction by disturbing the second light quantum Signal separator to the rear
With the 4th polarized component；Wherein, the polarization direction phase of the polarization direction of first polarized component and the third polarized component
Together, the polarization direction of second polarized component is identical as the polarization direction of the 4th polarized component；
S106: the Bell's state and described second for measuring first polarized component and the third polarized component polarize
Bell's state of component and the 4th polarized component.
Specifically, the unrelated quantum key distribution system of measuring device as shown in connection with fig. 2, the unrelated quantum key of measuring device
The concrete principle of distribution method are as follows:
Legal communicating pair (referred to as Alice and Bob) is that quantum state prepares transmitting terminal, they are by the light quantum of preparation
State be sent to third party (referred to as Charlie) carry out Bell's state projection measurement, the Bell's state chosen after obtaining, and further
Share security key in ground.
Prepare transmitting terminal in quantum state: light source issue phase randomization light pulse signal, by intensity modulator (IM) with
It is modulated into machine and inveigles one of state method intensity, subsequently enter light quantum state preparation facilities, according to key and prepare base
Information prepares corresponding light quantity subsignal, disturbs deflection device and carries out disturbing inclined operation to the polarization state of light quantity subsignal, makes light quantum
The polarization state of signal is evenly distributed on the surface of Poincare sphere, and light quantity subsignal is decayed to optimal light energy by adjustable attenuator (VA)
After export to fiber channel.Namely complete above-mentioned steps S101 and step S102.
By fibre channel transmission to measurement end, i.e. step S103.In measurement end, light quantity subsignal that Alice is sent
(i.e. by disturbing the first light quantity subsignal to the rear) is separated into horizontal polarisation component and vertical polarized component by polarization beam apparatus,
The light quantity subsignal (i.e. by disturbing the second light quantity subsignal to the rear) that Bob is sent also is separated by polarization beam apparatus horizontal inclined
Vibration component and vertical polarized component.Wherein, the light quantity that the horizontal polarisation component and Bob for the light quantity subsignal that Alice is sent are sent
The horizontal polarisation component of subsignal is input to Bell's state projection measuring device by polarization maintaining optical fibre, Bell's state projection measurement
Device is made of a polarization-maintaining beam splitter and two single-photon detectors, the horizontal polarization of Alice and Bob transmission light quantity subsignal
HOM interference occurs at polarization-maintaining beam splitter for component, and the optical signal after interference is detected by single-photon detector, according to two single photons
Corresponding Bell's state is selected after the detection result of detector.The vertical polarized component and Bob for the light quantity subsignal that Alice is sent
The vertical polarized component of the light quantity subsignal of transmission is input to another Bell's state projection measuring device, the shellfish by polarization maintaining optical fibre
You are made of state projection measuring device a polarization-maintaining beam splitter and two single-photon detectors, and Alice and Bob send light quantum letter
Number vertical polarized component HOM interference occurs at polarization-maintaining beam splitter, the optical signal after interference detected by single-photon detector, root
Corresponding Bell's state is selected after detection result according to two single-photon detectors.Namely corresponding above-mentioned steps S104-S106.
The embodiment of the present invention also provides a kind of measuring device unrelated quantum key distribution system, comprising: the first quantum state system
Preparation sending end, the second quantum state prepare transmitting terminal and measurement end；Wherein, the first quantum state prepares transmitting terminal and the second quantum state system
The structure of preparation sending end is identical as structure shown in Fig. 2 above, does not repeat them here in the present embodiment to this.
Unlike quantum key distribution system unrelated from measuring device shown in Fig. 2, to save equipment cost, the survey
Measuring end only includes Bell's state projection measuring device.For this purpose, measurement end is as shown in figure 4, include third polarization beam apparatus 41, the
Four polarization beam apparatus 42, the 5th polarization beam apparatus 43 and the 6th polarization beam apparatus 44.
The light quantum Signal separator that third polarization beam apparatus 41 is used to be inputted by the first fiber channel is at polarization direction phase
Mutually orthogonal the 5th polarized component and the 6th polarized component；4th polarization beam apparatus 42 is used to be inputted by the second fiber channel
Light quantum Signal separator seventh polarized component and eightth polarized component mutually orthogonal at polarization direction；5th polarized component it is inclined
Vibration direction is identical as the polarization direction of the 7th polarized component, the polarization direction of the 6th polarized component and the polarization of the 8th polarized component
Direction is identical；One output end of third polarization beam apparatus 41 and an input terminal of the 5th polarization beam apparatus pass through the first delay
Optical fiber 45 connects, and the first time delay optical fiber 45 is for the 5th polarized component of transmitting that is delayed；One output of the 4th polarization beam apparatus 42
End is connect with an input terminal of the 6th polarization beam apparatus 44 by the second time delay optical fiber 46, and the second time delay optical fiber 46 is for being delayed
The 7th polarized component is transmitted, the 5th polarized component is identical with the delay time t of the 7th polarized component；5th polarization beam apparatus 43 is used
The 5th polarized component and the 6th polarized component after it will be delayed carry out conjunction beam, obtain the first conjunction beam；6th polarization beam apparatus 44
For after being delayed the 7th polarized component and the 8th polarized component carry out conjunction beam, obtain the second conjunction beam；Bell's state projection measurement
Device 47 closes Bell's state of the different polarization component in beam and the second conjunction beam for timesharing measurement first.
Beam and second is closed using time division multiplexing Bell's state projection measuring device i.e. in the present embodiment come timesharing measurement first to close
Bell's state of horizontal polarisation component in beam and Bell's state of vertical polarized component.
Do not limited in the present embodiment be delayed be which kind of polarization direction polarized component, optionally, such as institute in Fig. 4
Show, vertical polarized component be delayed, horizontal polarisation component is without delay, in other embodiments, can also will it is horizontal partially
Vibration component is delayed, and vertical polarized component is without delay.
It is unrelated that a kind of measuring device is also provided based on the unrelated quantum key distribution system of above-mentioned measuring device, in the present embodiment
Quantum key delivering method, as shown in Figure 5, comprising:
S201: the first light quantity subsignal of preparation and the second light quantity subsignal；
S202: carrying out disturbing inclined operation to the first light quantity subsignal and the second light quantity subsignal, so that described
The polarization state of one light quantity subsignal and the second light quantity subsignal is evenly distributed on the surface of Poincare sphere；
S203: respectively by through disturbing the first light quantity subsignal to the rear by the first fibre channel transmission and will through disturbing partially
The second light quantity subsignal afterwards passes through the second fibre channel transmission；
S204: will be the 5th mutually orthogonal polarized component of polarization direction by disturbing the first light quantum Signal separator to the rear
With the 6th polarized component；
S205: will be the 7th mutually orthogonal polarized component of polarization direction by disturbing the second light quantum Signal separator to the rear
With the 8th polarized component；Wherein, the polarization direction of the 5th polarized component and the polarization direction phase of the 7th polarized component
Together, the polarization direction of the 6th polarized component is identical as the polarization direction of the 8th polarized component；
S206: five polarized component that is delayed and the 7th polarized component same time；
S207: by after delay the 5th polarized component and the 6th polarized component carry out conjunction beam, obtain the first conjunction beam, with
And by after delay the 7th polarized component and the 8th polarized component carry out conjunction beam, obtain the second conjunction beam；
S208: the described first Bell's state for closing beam and the different polarization component in the second conjunction beam is measured respectively.
Step S201-S205 can be found in the specific steps of step S101-S105, no longer be repeated in the present embodiment.
In the measurement end of time division multiplexing Bell's state projection measuring device, the light quantity subsignal that Alice is sent is polarized
Beam splitter is separated into horizontal polarisation component and vertical polarized component, and wherein horizontal polarisation component directly inputs next polarization beam splitting
Device, and then first delay t inputs next polarization beam apparatus to vertical polarized component again, the polarization beam apparatus by horizontal polarisation component and
Vertical polarized component exports after closing beam to Bell's state projection measuring device；It is similar therewith, the light quantity subsignal that Bob is sent also by
Polarization beam apparatus is separated into horizontal polarisation component and vertical polarized component, and wherein horizontal polarisation component directly inputs next polarization
Beam splitter, and then first delay t inputs next polarization beam apparatus to vertical polarized component again.Corresponding above-mentioned steps S206.
Output to Bell's state projects survey after horizontal polarisation component and vertical polarized component are closed beam by polarization beam apparatus (45,46)
Measure device.Corresponding above-mentioned steps S207.
Bell's state projection measuring device is made of a polarization-maintaining beam splitter and two single-photon detectors, Alice and Bob hair
Send the horizontal polarisation component of light quantity subsignal that HOM interference first occurs at polarization-maintaining beam splitter, the optical signal after interference is by single photon
Detector detection, according to selecting corresponding Bell's state after the detection result of two single-photon detectors；After the t that is delayed,
HOM interference, the light after interference also occur at polarization-maintaining beam splitter for the vertical polarized component that Alice and Bob sends light quantity subsignal
Signal is detected by single-photon detector, according to selecting corresponding Bell after the detection result of two single-photon detectors at this time
State.Corresponding above-mentioned steps S208.
In this way, Bell's state projection measuring device first carries out Bell's state projection measurement to horizontal polarisation component, after being delayed t
Bell's state projection measurement is carried out to vertical polarized component again, therefore, measurement end only needs Bell's state projection measuring device
Effective measurement to two groups of polarized components is completed, equipment cost has been saved, has enhanced practical value.
In the unrelated quantum key method of measuring device provided by the invention, transmitting terminal is prepared to light pulse signal in quantum state
Or the polarization state of light quantity subsignal disturb partially, and the light pulse signal or the polarization state of light quantity subsignal is made to be evenly distributed on Pang
Add the surface of Lay ball, then two-way is believed by independent optical fiber respectively by disturbing the light pulse signal operated partially or light quantity subsignal
Road is transmitted to measurement end and carries out Bell's state projection measurement.The every road light quantity subsignal of measurement end be first separated into two it is orthogonal inclined
Shake component, and the polarization direction difference of orthogonal polarized component is identical in two-way, then the identical polarized component difference in polarization direction
Carry out Bell's state projection measurement.
Polarization state due to entering the light quantity subsignal of fiber channel is evenly distributed on the surface of Poincare sphere, environmental factor
Caused by channel polarization scrambling it acted on cancel out each other.And in measurement end, pass through first polarization separation Bell's state projection measurement again
Mode, ensure that the full same sex of projection measurement light quantum signal polarization characteristic, Bell's state projection measurement stablized, is quasi-
Really carry out.
Since the unrelated quantum key distribution system of measuring device needs polarization recovery and compensating module in the prior art, not only
Increase system complexity, reduces efficiency of transmission, and the number of disadvantages such as security risk can be brought.Provided by the present invention for realizing
In the unrelated quantum key distribution system of the measuring device of the above method, it is only necessary to prepare transmitting terminal in quantum state and increase disturbance device i.e.
Can, the polarization calibration of measurement end in the prior art and compensation device can be removed, so that the unrelated quantum key of measuring device
Dissemination system is immune to channel polarization scrambling, and measurement end enables key distribution procedure without carrying out polarization calibration and compensation
Stablize, efficiently carry out.
It should be noted that all the embodiments in this specification are described in a progressive manner, each embodiment weight
Point explanation is the difference from other embodiments, and the same or similar parts between the embodiments can be referred to each other.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to 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, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (12)
1. a kind of unrelated quantum key distribution system of measuring device characterized by comprising
First quantum state prepares transmitting terminal, the second quantum state prepares transmitting terminal and measurement end；
First quantum state prepares transmitting terminal and is connect with the measurement end by the first fiber channel；
Second quantum state prepares transmitting terminal and is connect with the measurement end by the second fiber channel；
First quantum state prepares transmitting terminal and second quantum state, and to prepare sending end structure identical, includes:
Light source, light quantum state preparation facilities, disturbs deflection device and adjustable attenuator at intensity modulator；
The deflection device of disturbing makes the light pulse signal for disturb partially to the polarization state of light pulse signal or light quantity subsignal
Or the polarization state of light quantity subsignal is evenly distributed on the surface of Poincare sphere；
The output end of the adjustable attenuator prepares the output end of transmitting terminal as quantum state, and the light quantum after light intensity attenuation is believed
Number output is to fiber channel；
The measurement end includes:
First polarization beam apparatus, the second polarization beam apparatus, first Bell's state projection measuring device and second Bell's state projection measurement
Device, the first Bell state projection measuring device and the second Bell state projection measuring device include a polarization-maintaining beam splitting
Device and two single-photon detectors；
The light quantum Signal separator that first polarization beam apparatus is used to be inputted by first fiber channel is at polarization direction
Mutually orthogonal the first polarized component and the second polarized component；
The light quantum Signal separator that second polarization beam apparatus is used to be inputted by second fiber channel is at polarization direction
Mutually orthogonal third polarized component and the 4th polarized component；
The polarization direction of first polarized component is identical as the polarization direction of the third polarized component, second polarization point
The polarization direction of amount is identical as the polarization direction of the 4th polarized component；
The first Bell state projection measuring device is used to measure the shellfish of first polarized component and the third polarized component
That state；
The second Bell state projection measuring device is used to measure the shellfish of second polarized component and the 4th polarized component
That state.
2. the unrelated quantum key distribution system of measuring device according to claim 1, which is characterized in that the light source, institute
State intensity modulator, the light quantum state preparation facilities, the connection relationship for disturbing deflection device and the adjustable attenuator are as follows: institute
It states light source, the intensity modulator, the light quantum state preparation facilities, described disturb deflection device and the adjustable attenuator successively connects
It connects.
3. the unrelated quantum key distribution system of measuring device according to claim 1, which is characterized in that the light source, institute
State intensity modulator, the light quantum state preparation facilities, the connection relationship for disturbing deflection device and the adjustable attenuator are as follows:
The light source, described disturbs deflection device, the light quantum state preparation facilities and the adjustable attenuator at the intensity modulator
It is sequentially connected.
4. the unrelated quantum key distribution system of measuring device according to claim 1, which is characterized in that first polarization
Between polarization-maintaining beam splitter in beam splitter and the first Bell state projection measuring device and second polarization beam apparatus with
It is polarization maintaining optical fibre connection between polarization-maintaining beam splitter in the second Bell state projection measuring device.
5. the unrelated quantum key distribution system of measuring device according to any one of claims 1-4, which is characterized in that institute
Stating and disturbing deflection device includes: actively to disturb deflection device, passively disturb deflection device or described actively disturb deflection device and described passively disturb deflection device
Combination disturb deflection device.
6. a kind of unrelated quantum key distribution system of measuring device characterized by comprising
First quantum state prepares transmitting terminal, the second quantum state prepares transmitting terminal and measurement end；
First quantum state prepares transmitting terminal and is connect with the measurement end by the first fiber channel；
Second quantum state prepares transmitting terminal and is connect with the measurement end by the second fiber channel；
First quantum state prepares transmitting terminal and second quantum state, and to prepare sending end structure identical, includes:
Light source, light quantum state preparation facilities, disturbs deflection device and adjustable attenuator at intensity modulator；
The deflection device of disturbing makes the light pulse signal for disturb partially to the polarization state of light pulse signal or light quantity subsignal
Or the polarization state of light quantity subsignal is evenly distributed on the surface of Poincare sphere；
The output end of the adjustable attenuator prepares the output end of transmitting terminal as quantum state, and the light quantum after light intensity attenuation is believed
Number output is to fiber channel；
The measurement end includes:
Third polarization beam apparatus, the 4th polarization beam apparatus, the 5th polarization beam apparatus, the 6th polarization beam apparatus and the projection of Bell's state are surveyed
Device is measured, Bell's state projection measuring device includes a polarization-maintaining beam splitter and two single-photon detectors；
The light quantum Signal separator that the third polarization beam apparatus is used to be inputted by first fiber channel is at polarization direction
The 5th mutually orthogonal polarized component and the 6th polarized component；
The light quantum Signal separator that 4th polarization beam apparatus is used to be inputted by second fiber channel is at polarization direction
The 7th mutually orthogonal polarized component and the 8th polarized component；
The polarization direction of 5th polarized component is identical as the polarization direction of the 7th polarized component, the 6th polarization point
The polarization direction of amount is identical as the polarization direction of the 8th polarized component；
One output end of the third polarization beam apparatus and an input terminal of the 5th polarization beam apparatus prolong by first
When optical fiber connect, first time delay optical fiber transmits the 5th polarized component for being delayed；
One output end of the 4th polarization beam apparatus and an input terminal of the 6th polarization beam apparatus prolong by second
When optical fiber connect, second time delay optical fiber transmits the 7th polarized component, the 5th polarized component and institute for being delayed
The delay time for stating the 7th polarized component is identical；
5th polarization beam apparatus be used for will be delayed after the 5th polarized component and the 6th polarized component carry out conjunction beam, obtain
Beam is closed to first；
6th polarization beam apparatus be used for will be delayed after the 7th polarized component and the 8th polarized component carry out conjunction beam, obtain
Beam is closed to second；
Bell's state projection measuring device measures the different polarization in the first conjunction beam and the second conjunction beam for timesharing
Bell's state of component.
7. the unrelated quantum key distribution system of measuring device according to claim 6, which is characterized in that the light source, institute
State intensity modulator, the light quantum state preparation facilities, the connection relationship for disturbing deflection device and the adjustable attenuator are as follows: institute
It states light source, the intensity modulator, the light quantum state preparation facilities, described disturb deflection device and the adjustable attenuator successively connects
It connects.
8. the unrelated quantum key distribution system of measuring device according to claim 6, which is characterized in that the light source, institute
State intensity modulator, the light quantum state preparation facilities, the connection relationship for disturbing deflection device and the adjustable attenuator are as follows: institute
Light source, the intensity modulator, deflection device, the light quantum state preparation facilities and the adjustable attenuator of disturbing is stated successively to connect
It connects.
9. the unrelated quantum key distribution system of measuring device according to claim 6, which is characterized in that the 5th polarization
Between polarization-maintaining beam splitter in beam splitter and Bell's state projection measuring device and the 6th polarization beam apparatus with it is described
It is polarization maintaining optical fibre connection between polarization-maintaining beam splitter in Bell's state projection measuring device.
10. according to the unrelated quantum key distribution system of measuring device described in claim 6-9 any one, which is characterized in that
The deflection device of disturbing includes: actively to disturb deflection device, passively disturb deflection device or described actively disturb deflection device and described passively disturb inclined dress
Deflection device is disturbed in the combination set.
11. a kind of unrelated quantum key delivering method of measuring device, which is characterized in that be applied to claim 1-5 any one
The unrelated quantum key distribution system of the measuring device, the unrelated quantum key delivering method of the measuring device include:
Prepare the first light quantity subsignal and the second light quantity subsignal；
The first light quantity subsignal and the second light quantity subsignal are carried out disturbing inclined operation, so that first light quantum is believed
Number and the polarization state of the second light quantity subsignal be evenly distributed on the surface of Poincare sphere；
Process is disturbed into the first light quantity subsignal to the rear respectively and disturbs to the rear second by the first fibre channel transmission and by process
Light quantity subsignal passes through the second fibre channel transmission；
By it is described by disturbing the first light quantum Signal separator to the rear be mutually orthogonal the first polarized component in polarization direction and the
Two polarized components；
By it is described by disturbing the second light quantum Signal separator to the rear be the mutually orthogonal third polarized component in polarization direction and the
Four polarized components；Wherein, the polarization direction of first polarized component is identical as the polarization direction of the third polarized component, institute
The polarization direction for stating the second polarized component is identical as the polarization direction of the 4th polarized component；
Measure the Bell's state and second polarized component and described of first polarized component and the third polarized component
Bell's state of 4th polarized component.
12. a kind of unrelated quantum key delivering method of measuring device, which is characterized in that be applied to claim 6-10 any one
The unrelated quantum key distribution system of the measuring device, the unrelated quantum key delivering method of the measuring device include:
Prepare the first light quantity subsignal and the second light quantity subsignal；
The first light quantity subsignal and the second light quantity subsignal are carried out disturbing inclined operation, so that first light quantum is believed
Number and the polarization state of the second light quantity subsignal be evenly distributed on the surface of Poincare sphere；
Process is disturbed into the first light quantity subsignal to the rear respectively and disturbs to the rear second by the first fibre channel transmission and by process
Light quantity subsignal passes through the second fibre channel transmission；
By it is described by disturbing the first light quantum Signal separator to the rear be mutually orthogonal the 5th polarized component in polarization direction and the
Six polarized components；
By it is described by disturbing the second light quantum Signal separator to the rear be mutually orthogonal the 7th polarized component in polarization direction and the
Eight polarized components；Wherein, the polarization direction of the 5th polarized component is identical as the polarization direction of the 7th polarized component, institute
The polarization direction for stating the 6th polarized component is identical as the polarization direction of the 8th polarized component；
Five polarized component that is delayed and the 7th polarized component same time；
By after delay the 5th polarized component and the 6th polarized component carry out conjunction beam, obtain the first conjunction beam, and will delay
The 7th polarized component and the 8th polarized component afterwards carries out conjunction beam, obtains the second conjunction beam；
The described first Bell's state for closing beam and the different polarization component in the second conjunction beam is measured respectively.
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| CN109995517A (en) * | 2017-12-29 | 2019-07-09 | 科大国盾量子技术股份有限公司 | A kind of miniaturization light quantum coding device and method |
| CN107979463B (en) * | 2018-01-22 | 2020-06-26 | 中国科学技术大学 | Phase encoder-decoder and quantum key distribution system |
| CN110752913B (en) * | 2018-07-23 | 2021-02-23 | 华为技术有限公司 | Quantum key transmission device and system |
| CN108989035B (en) * | 2018-09-07 | 2021-06-15 | 上海循态信息科技有限公司 | Measurement equipment independence-based continuous variable quantum key distribution method and system |
| CN110896329B (en) * | 2018-09-12 | 2022-04-19 | 中国科学技术大学 | Continuous variable quantum key distribution coherent detection system based on local oscillator light scheme |
| CN110401494B (en) * | 2019-08-30 | 2020-11-24 | 北京邮电大学 | Quantum secure direct communication method irrelevant to measuring equipment on high-dimensional subspace |
| CN110808837B (en) * | 2019-11-21 | 2021-04-27 | 国网福建省电力有限公司 | Quantum key distribution method and system based on tree-shaped QKD network |
| CN113676323B (en) * | 2021-10-25 | 2022-02-11 | 北京正道量子科技有限公司 | Irrelevant quantum key distribution system of polarization encoding measuring equipment |
| CN115913551B (en) * | 2023-01-05 | 2023-05-09 | 北京中科国光量子科技有限公司 | Measurement equipment independent quantum key distribution system for real-time calibration of reference system |
| CN116527251B (en) * | 2023-05-06 | 2023-11-03 | 山西大学 | Device and method for distributing sideband interferometry measurement equipment independent double-field quantum key |
| CN117134912B (en) * | 2023-10-26 | 2024-02-23 | 中国科学技术大学 | Quantum key distribution system |
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