CN106656491B - The compensation method of half-wave voltage of phase modulator in a kind of quantum key dispatching system - Google Patents
The compensation method of half-wave voltage of phase modulator in a kind of quantum key dispatching system Download PDFInfo
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- CN106656491B CN106656491B CN201611254402.XA CN201611254402A CN106656491B CN 106656491 B CN106656491 B CN 106656491B CN 201611254402 A CN201611254402 A CN 201611254402A CN 106656491 B CN106656491 B CN 106656491B
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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
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/524—Pulse modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/548—Phase or frequency modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/80—Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water
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- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The invention belongs to quanta cryptology technique fields, more particularly to a kind of compensation method of half-wave voltage of phase modulator in quantum key dispatching system, device includes: transmitting terminal and receiving end, wherein, the transmitting terminal includes: Distributed Feedback Laser, light intensity modulator, voltage-controlled attenuator, optical circulator, Mach-Zehnder interferometer, photodetector, FPGA, faraday's Michelson's interferometer, optoisolator and wavelength division multiplexer, and the receiving end includes: wavelength division multiplexer, optoisolator, faraday's Michelson's interferometer and single-photon detector；Method: first obtaining the phase and voltage-drop loading relationship of transmitting terminal phase-modulator, then carries out quantum-key distribution and send the detection of two interferometer techniques, then FPGA extracts analysis of accounts and concludes, and compensates further according to phase voltage relationship.The problem of voltage-phase relation that the present invention monitors real-time tracking phase-modulator by closed loop is drifted about, and real-time perfoming compensates, and improves the measurement accuracy of half-wave voltage.
Description
Technical field
The invention belongs to quanta cryptology technique fields, and in particular to one kind is based on quantum key dispatching system to phase-modulation
The device and method that device half-wave voltage compensates.
Background technique
In quantum key dispatching system based on faraday's Michelson (F-M) interference ring, the phase of phase-modulator adds
Whether carrying accurate, the overall performance of system is directly influenced.When the half-wave voltage value of phase-modulator load is fluctuated, make
It is increased at the bit error rate of system, reduces key production rate, and seriously affect into the randomness of code.For the wave of half-wave voltage value
It is dynamic, the equal real-time perfoming of transmitting terminal and receiving end is scanned, the efficiency of system can be reduced.When actual equipment is run, by using
Fixed transmitting terminal half-wave voltage is worth constant, 4 phase voltage of real time scan receiving end.For the fluctuation of half-wave voltage value, usually
By scan pattern, the half-wave voltage of phase-modulator is found using extremum method, fixes the phase-modulator on-load voltage of one end,
The other end is scanned, the half-wave voltage of phase-modulator is determined by maximum value and minimum value.The method is based on transmitting terminal phase
The stable premise of position modularot voltage-phase relation, but the voltage-phase relation is there are drift phenomenon, therefore receiving end and hair
Sending end either party there are drift phenomenons can all introduce error；And phase-modulator can only be measured roughly using extremum method
Half-wave voltage, leading to the load of transmitting terminal phase voltage, there are errors, cannot achieve higher precision.Therefore it is a kind of right how to design
The technical issues of phase voltage compensates, and improving the device and method of phase voltage precision becomes this field urgent need to resolve.
Summary of the invention
In view of the deficiencies of the prior art, the invention proposes electric to phase-modulator half-wave based on quantum key dispatching system
The device and method compensated is pressed, the present invention improves quantum key to by improving to single-ended phase modulation system
The half-wave voltage loading accuracy of phase-modulation in distribution, while during quantum-key distribution, by closed loop monitoring in real time with
The problem of voltage of track phase-modulator-phase relation drift, and real-time perfoming compensates, and realizes single-ended phase correction.
In order to solve the above technical problems, the technical scheme adopted by the invention is as follows: it is close based on quantum that the invention proposes one kind
The device that key distribution system compensates half-wave voltage of phase modulator, according to an embodiment of the invention, include: transmitting terminal and
Receiving end, wherein the transmitting terminal includes: Distributed Feedback Laser, light intensity modulator, voltage-controlled attenuator, faraday's Michelson interference
Instrument, optoisolator and wavelength division multiplexer, wherein the Distributed Feedback Laser is connected with the light intensity modulator, for generating pulse
Light, the light intensity modulator are connected with the Distributed Feedback Laser and voltage-controlled attenuator respectively, for pulsed light carry out signal state and
State modulation is inveigled to become pulsed optical signals, the voltage-controlled attenuator is connected with the light intensity modulator and optical circulator respectively, uses
In by light pulse signal decaying at single photon signal, faraday's Michelson's interferometer respectively with the optical circulator
Be connected with optoisolator, for single photon signal generate interference, the optoisolator respectively with faraday's Michelson
Interferometer is connected with wavelength division multiplexer, for making single photon signal one-way conduction, the transmitting terminal further include: optical circulator, horse
Conspicuous Zehnder interferometer, photodetector and FPGA, wherein the optical circulator includes first port, second port and third end
Mouthful, the first port and second port form first passage, and the second port and third port form second channel, described
First port is connected with the voltage-controlled attenuator, the light beam splitting in the second port and faraday's Michelson's interferometer
Device is connected, and the third port is connected with the Mach-Zehnder interferometer, is transmitted to the method through the first passage for making
The single photon signal interfered in Michelson's interferometer is drawn to be transmitted to the Mach Zeng Degan through the second channel again
Carry out interference of photons in interferometer again, the Mach-Zehnder interferometer includes: the first beam splitter and the second beam splitter, described
First beam splitter and the second beam splitter are connected by fiber delay line, for carrying out delay process, institute to single photon signal
It states photodetector to be connected with second beam splitter and FPGA respectively, for detecting single photon signal and being converted into
Electric signal.
Inventors have found that the device and method are supervised during quantum-key distribution by closed loop through the invention
The problem of surveying voltage-phase relation drift of real-time tracking phase-modulator, and real-time perfoming compensates, and realizes single-ended phase and entangles
Partially, while the negative effect in performance will not be introduced to system, efficiency will not be caused to decline system, improve half-wave voltage
Measurement accuracy, while quantum key dispatching system is more stable, to the more adaptable of environment.
According to an embodiment of the invention, the receiving end includes: wavelength division multiplexer, optoisolator, faraday's Michelson
The wavelength division multiplexer of interferometer and single-photon detector, the wavelength division multiplexer of the receiving end and the transmitting terminal passes through public letter
Road is connected, for being transmitted to receiving end, the optoisolator after the single photon signal of the different wave length of transmitting terminal is carried out conjunction beam
It is connected respectively with the wavelength division multiplexer and faraday's Michelson's interferometer, the single-photon detector and the faraday step
Ke Erxun interferometer is connected, for detecting to single photon signal.
According to an embodiment of the invention, the method for faraday's Michelson's interferometer and the transmitting terminal in the receiving end
It draws Michelson's interferometer structure identical, includes: first faraday's reflecting mirror, phase-modulator, the second faraday reflection
Mirror and beam splitter, wherein the first faraday reflecting mirror is connected with the phase-modulator, for single photon signal into
Row reflection, the phase-modulator are connected with the first faraday reflecting mirror and beam splitter respectively, for believing single photon
Number phase-modulation is carried out, the second faraday reflecting mirror connect with the beam splitter, and the beam splitter of the transmitting terminal divides
It is not connected with second faraday's reflecting mirror, phase-modulator, optical circulator and the optoisolator of the transmitting terminal, the receiving end
Beam splitter second faraday's reflecting mirror, phase-modulator, optoisolator and the single photon detection with the receiving end respectively
Device is connected, and is used to the beam splitting in proportion of a branch of single photon signal.
According to an embodiment of the invention, described device frequency is 50M, the light pulse signal interval time is 20ns, institute
Stating delay time is 20ns, and the electric signal is voltage signal.
In another aspect of this invention, a kind of method compensated using device noted earlier is proposed, according to this hair
Bright embodiment, comprising the following steps: step 1: the previous optical pulse propagation issued by Distributed Feedback Laser is to the transmitting terminal
Phase-modulator when, the voltage of the phase-modulator of the transmitting terminal is fixed as 0V, latter pulse is transmitted to the transmission
When the phase-modulator at end, the voltage of the phase-modulator of the transmitting terminal is in 0V to V0 Variation in range, changes every 0.1V
Once, the specific steps are fix one in 0V to V0The N number of point of voltage scanning changed in range, scanning are completed a voltage, are obtained
To count value, then in 0V to V0It fixes next voltage in range to be scanned, then according to interference counting ratio formula, then calculate correspondingValue, thus obtains the phase-modulation of the transmitting terminal
The phase voltage of device loads relationship, wherein the y is indicated are as follows: the count value and previous light that each fixed voltage value scans
The ratio value of the ratio between count value when the phase-modulator of pulse and latter optical pulse propagation to the transmitting terminal loads 0V,Indicate the phase difference of two photons of interference；Step 2: described device carries out quantum-key distribution, in quantum-key distribution
During, the forward and backward pulsed light that the Distributed Feedback Laser issues becomes forward and backward pulsed optical signals through the light intensity modulator, then
By the voltage-controlled attenuator, by the forward and backward pulsed optical signals decaying at the forward and backward single photon signal, the forward and backward list
Faraday's Michelson's interferometer that photon signal is transmitted to the transmitting terminal through the first passage of the optical circulator is done
It relates to, forward and backward single photon signal a part after interference is transmitted to the receiving end through the optoisolator and wavelength division multiplexer
Faraday's Michelson's interferometer carries out quantum-key distribution, and another part is transmitted to institute through the second channel of the optical circulator
It states Mach-Zehnder interferometer to be interfered, the single photon after Mach-Zehnder interferometer interference is transmitted to the photoelectricity
Detector is counted, and the FPGA extracts analysis to the information of detection, is loaded according to the transmitting terminal phase-modulator
Phase sorted out, extract the count value N that forward and backward pulse load phase difference is respectively pi/2 and 3 pi/2sa=1、2、3、4、5、6、7、8,
Count value is calculated；Step 3: choosing Na=1、2、7、8Count value, if half-wave voltage phase drift angle is 2 θ, then:, the value of θ is calculated, the half-wave voltage drift is obtained
The value of 2 θ of angle is moved, then the load of the phase voltage according to obtained in step 1 relationship obtains the voltage value that need to be compensated,
In, N1Phase for the previous pulse load of the transmitting terminal phase-modulator is pi/2 and the latter pulse of transmitting terminal phase-modulator
The count value when phase of load is 0, N2Phase for the previous pulse load of the transmitting terminal phase-modulator is 3 pi/2s and hair
The count value when phase of the latter pulse load of sending end phase-modulator is 0, N7For the previous arteries and veins of transmitting terminal phase-modulator
The count value when phase of punching load is 0 and the phase of the latter pulse load of transmitting terminal phase-modulator is 3 pi/2, N8It is described
The phase of the previous pulse load of transmitting terminal phase-modulator is π and the phase of the latter pulse load of transmitting terminal phase-modulator is 3
Count value when pi/2.
According to an embodiment of the invention, in the step 1, N 10000.
According to an embodiment of the invention, in the step 2, during quantum-key distribution, the phase of the transmitting terminal
Position modulator every 20ns random loading phase be 0 π, pi/2, π, a phase in 3 pi/2s.
The present invention is include at least the following beneficial effects: the device and method through the invention, in quantum-key distribution
In the process, the problem of being drifted about by voltage-phase relation that closed loop monitors real-time tracking phase-modulator, and real-time perfoming is mended
It repays, realizes single-ended phase correction, while the negative effect in performance will not be introduced to system, efficiency will not be caused to system
Decline, improves the measurement accuracy of half-wave voltage, while quantum key dispatching system is more stable, to the more adaptable of environment.
Detailed description of the invention
Fig. 1 is that the present invention is based on the apparatus structures that quantum key dispatching system compensates half-wave voltage of phase modulator
Schematic diagram.
Wherein, transmitting terminal 1, Distributed Feedback Laser 101, light intensity modulator 102, voltage-controlled attenuator 103, optical circulator 104, light
Circulator first port 10401, optical circulator second port 10402, optical circulator third port 10403, faraday Michael
Inferior interferometer 105, first faraday's reflecting mirror 10501, phase-modulator 10502, second faraday's reflecting mirror 10503, light point
Beam device 10504, optoisolator 106, wavelength division multiplexer 107, Mach-Zehnder interferometer 108, the first beam splitter 10801, second
Beam splitter 10802, fiber delay line 10803, photodetector 109, common signal channel 2, receiving end 3, wavelength division multiplexer 301,
Optoisolator 302, faraday's Michelson's interferometer 303, first faraday's reflecting mirror 30301, phase-modulator 30302, the
Two faraday's reflecting mirrors 30303, beam splitter 30304, single-photon detector 304.
Specific embodiment
In order to make those skilled in the art more fully understand technical solution of the present invention, combined with specific embodiments below to this
Invention is described in further detail.The embodiments described below is exemplary, and for explaining only the invention, and cannot be understood
For limitation of the present invention.
The invention proposes a kind of dresses compensated based on quantum key dispatching system to half-wave voltage of phase modulator
It sets, Fig. 1 is that the present invention is based on the apparatus structure signals that quantum key dispatching system compensates half-wave voltage of phase modulator
Figure, it is shown referring to Fig.1, according to an embodiment of the invention, device of the present invention includes: transmitting terminal 1 and receiving end 3, wherein institute
Stating transmitting terminal includes: Distributed Feedback Laser 101, light intensity modulator 102, voltage-controlled attenuator 103, optical circulator 104, faraday's mikey
The inferior interferometer 105 of that, Mach-Zehnder interferometer 108, photodetector 109, FPGA, optoisolator 106 and wavelength division multiplexer
107, wherein the Distributed Feedback Laser is connected with the light intensity modulator, for generating pulsed light, the light intensity modulator difference
It is connected with the Distributed Feedback Laser and voltage-controlled attenuator, for carrying out signal state to pulsed light and state modulation being inveigled to become pulsed light
Signal, the voltage-controlled attenuator are connected with the light intensity modulator and optical circulator respectively, for the light pulse signal to decline
Subtract into single photon signal, the optical circulator includes first port 10401, second port 10402 and third port 10403, institute
It states first port and second port and forms first passage, the second port and third port form second channel, and described first
Port is connected with the voltage-controlled attenuator, the second port and the beam splitter phase in faraday's Michelson's interferometer
Even, the third port is connected with the Mach-Zehnder interferometer, is transmitted to the faraday through the first passage for making
The single photon signal interfered in Michelson's interferometer is transmitted to the Mach-Zehnder interferometer through the second channel again
In carry out interference of photons again, faraday's Michelson's interferometer is connected with the optical circulator and optoisolator respectively,
For generating interference to single photon signal comprising: first faraday's reflecting mirror 10501, phase-modulator 10502, the second method
Drawing reflecting mirror 10503 and beam splitter 10504, wherein the first faraday reflecting mirror is connected with the phase-modulator,
For reflecting single photon signal, the phase-modulator respectively with the first faraday reflecting mirror and beam splitter phase
Even, for carrying out phase-modulation to single photon signal, the second faraday reflecting mirror is connect with the beam splitter, the hair
The beam splitter of sending end respectively with second faraday's reflecting mirror, phase-modulator, optical circulator and the optical isolation of the transmitting terminal
Device is connected, and the Mach-Zehnder interferometer includes: the first beam splitter 10801 and the second beam splitter 10802, first light
Beam splitter and the second beam splitter are connected by fiber delay line 10803, described for carrying out delay process to single photon signal
Photodetector is connected with second beam splitter and FPGA respectively, for being detected to single photon signal and being converted into electricity
Signal, the optoisolator is connected with faraday's Michelson's interferometer and wavelength division multiplexer respectively, for making single photon
Signal one-way conduction.
According to an embodiment of the invention, the receiving end 3 includes: wavelength division multiplexer 301, optoisolator shown in referring to Fig.1
302, faraday's Michelson's interferometer 303 and single-photon detector 304, the wavelength division multiplexer of the receiving end and the transmission
The wavelength division multiplexer at end is connected by common signal channel 2, after the single photon signal of the different wave length of transmitting terminal is carried out conjunction beam
It is transmitted to receiving end, the optoisolator is connected with the wavelength division multiplexer and faraday's Michelson's interferometer respectively, described
Single-photon detector is connected with faraday's Michelson's interferometer, for detecting to single photon signal.
According to an embodiment of the invention, shown in referring to Fig.1, faraday's Michelson's interferometer and institute in the receiving end
The faraday's Michelson's interferometer structure for stating transmitting terminal is identical, includes: first faraday's reflecting mirror 30301, phase-modulation
Device 30302, second faraday's reflecting mirror 30303 and beam splitter 30304, wherein the first faraday reflecting mirror with it is described
Phase-modulator is connected, and for reflecting single photon signal, the phase-modulator is anti-with first faraday respectively
It penetrates mirror to be connected with beam splitter, for carrying out phase-modulation, the second faraday reflecting mirror and the light to single photon signal
Beam splitter connection, the beam splitter of the receiving end respectively with second faraday's reflecting mirror of the receiving end, phase-modulator,
Optoisolator is connected with single-photon detector, is used to the beam splitting in proportion of a branch of single photon signal.
According to some embodiments of the present invention, the frequency of device of the present invention is 50M, when the light pulse signal interval
Between be 20ns, the delay time be 20ns, the electric signal be voltage signal.
In another aspect of this invention, a kind of method compensated using mentioned-above device is provided, according to this
The embodiment of invention, comprising the following steps: step 1: the previous optical pulse propagation issued by Distributed Feedback Laser is to the transmission
When the phase-modulator at end, the voltage of the phase-modulator of the transmitting terminal is fixed as 0V, latter pulse is transmitted to the hair
When the phase-modulator of sending end, the voltage of the phase-modulator of the transmitting terminal is in 0V to V0 Variation in range, becomes every 0.1V
Change once, the specific steps are fix one in 0V to V0An electricity is completed in 10000 points of voltage scanning changed in range, scanning
Pressure, obtains count value, then in 0V to V0Next voltage is fixed in range to be scanned, it is then public according to interference counting ratio
Formula, then calculate correspondingValue, thus obtains the phase-modulation of the transmitting terminal
The phase voltage of device loads relationship, wherein the y is indicated are as follows: the count value and previous light that each fixed voltage value scans
The ratio value of the ratio between count value when the phase-modulator of pulse and latter optical pulse propagation to the transmitting terminal loads 0V,Indicate the phase difference of two photons of interference.
According to an embodiment of the invention, step 2: described device carries out quantum-key distribution, in the mistake of quantum-key distribution
Cheng Zhong, the forward and backward pulsed light that the Distributed Feedback Laser issues become forward and backward pulsed optical signals through the light intensity modulator, using
The voltage-controlled attenuator, by the forward and backward pulsed optical signals decaying at the forward and backward single photon signal, the forward and backward single photon
Faraday's Michelson's interferometer that signal is transmitted to the transmitting terminal through the first passage of the optical circulator is interfered, and is done
Forward and backward single photon signal a part after relating to is transmitted to the faraday of the receiving end through the optoisolator and wavelength division multiplexer
Michelson's interferometer carries out quantum-key distribution, and another part is transmitted to the Mach through the second channel of the optical circulator
Zehnder interferometer is interfered, and the single photon after Mach-Zehnder interferometer interference is transmitted to the photodetector
It is counted, the FPGA extracts analysis to the information of detection, the phase loaded according to the transmitting terminal phase-modulator
Sorted out, extracts the count value N that forward and backward pulse load phase difference is respectively pi/2 and 3 pi/2sa=1、2、3、4、5、6、7、8, to counting
Value is calculated.
According to an embodiment of the invention, during quantum-key distribution, the phase-modulator of the transmitting terminal every
20ns random loading phase is 0 π, pi/2, π, a phase in 3 pi/2s.
According to an embodiment of the invention, the transmitting terminal includes: Distributed Feedback Laser, light intensity modulator, voltage-controlled attenuator, light
Circulator, faraday's Michelson's interferometer, Mach-Zehnder interferometer, photodetector, FPGA, optoisolator and wavelength-division multiplex
Device, wherein the Distributed Feedback Laser is connected with the light intensity modulator, for generating pulsed light, the light intensity modulator respectively with
The Distributed Feedback Laser is connected with voltage-controlled attenuator, for carrying out signal state to pulsed light and state modulation being inveigled to become pulsed light letter
Number, the voltage-controlled attenuator is connected with the light intensity modulator and optical circulator respectively, for the light pulse signal to be decayed
At single photon signal, the optical circulator includes first port, second port and third port, the first port and second end
Mouth forms first passage, and the second port and third port form second channel, the first port and the automatically controlled decaying
Device be connected, the second port is connected with the beam splitter in faraday's Michelson's interferometer, the third port and
The Mach-Zehnder interferometer is connected, for make to be transmitted to through the first passage in faraday's Michelson's interferometer into
The single photon signal of row interference is transmitted in the Mach-Zehnder interferometer through the second channel again carries out interference of photons again,
Faraday's Michelson's interferometer is connected with the optical circulator and optoisolator respectively, for generating to single photon signal
Interference, the Mach-Zehnder interferometer includes: the first beam splitter and the second beam splitter, first beam splitter and second
Beam splitter by fiber delay line be connected, for single photon signal carry out delay process, the photodetector respectively with
Second beam splitter is connected with FPGA, for electric signal, the optical isolation to be detected and be converted into single photon signal
Device is connected with faraday's Michelson's interferometer and wavelength division multiplexer respectively, for making single photon signal one-way conduction.
According to an embodiment of the invention, transmitting terminal PD acquires data counts statistics as follows during actual transmissions:
Step 3: choosing Na=1、2、7、8Count value, if half-wave voltage phase drift angle is 2 θ,
Then:, the value of θ is calculated, is obtained described
Half-wave voltage is drifted about the value of 2 θ of angle, and then the load of the phase voltage according to obtained in step 1 relationship obtains need to compensating
Voltage value improves the measurement temperature of half-wave voltage, wherein N1For the phase of the previous pulse load of the transmitting terminal phase-modulator
Count value when phase for pi/2 and the latter pulse load of transmitting terminal phase-modulator is 0, N2For the transmitting terminal phase-modulation
The count value that the phase of device previous pulse load is the phase of 3 pi/2s and the latter pulse load of transmitting terminal phase-modulator when being 0,
N7Phase for the transmitting terminal phase-modulator previous pulse load is 0 and the latter pulse of transmitting terminal phase-modulator loads
Count value when phase is 3 pi/2, N8Phase for the previous pulse load of the transmitting terminal phase-modulator is π and transmitting terminal phase
The count value when phase of the latter pulse load of position modulator is 3 pi/2.
Inventors have found that the device and method are supervised during quantum-key distribution by closed loop through the invention
The problem of surveying voltage-phase relation drift of real-time tracking phase-modulator, and real-time perfoming compensates, and realizes single-ended phase and entangles
Partially, while the negative effect in performance will not be introduced to system, efficiency will not be caused to decline system, improve half-wave voltage
Measurement accuracy, while quantum key dispatching system is more stable, to the more adaptable of environment.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " illustrative examples ",
The description of " example ", specific examples or " some examples " etc. means specific features described in conjunction with this embodiment or example, knot
Structure, material or feature are included at least one embodiment or example of the invention.In the present specification, to above-mentioned term
Schematic representation may not refer to the same embodiment or example.Moreover, specific features, structure, material or the spy of description
Point can be combined in any suitable manner in any one or more of the embodiments or examples.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " connected " and
" connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can be
Mechanical connection is also possible to a connection；It can be directly connected, two can also be can be indirectly connected through an intermediary
Connection inside element.For the ordinary skill in the art, above-mentioned term can be understood in the present invention with concrete condition
In concrete meaning.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, modifies, replacement and variant, at the same time, for those skilled in the art, the think of according to the application
Think, there will be changes in the specific implementation manner and application range.
Claims (6)
1. a kind of device compensated based on quantum key dispatching system to half-wave voltage of phase modulator, comprising: transmitting terminal
The receiving end and, wherein the transmitting terminal includes: that Distributed Feedback Laser, light intensity modulator, voltage-controlled attenuator, faraday's Michelson are dry
Interferometer, optoisolator and wavelength division multiplexer, wherein the Distributed Feedback Laser is connected with the light intensity modulator, for generating light arteries and veins
Punching, the light intensity modulator is connected with the Distributed Feedback Laser and voltage-controlled attenuator respectively, for light pulse carry out signal state with
State modulation is inveigled to become light pulse signal, the voltage-controlled attenuator is connected with the light intensity modulator and optical circulator respectively, uses
In by light pulse signal decaying at single photon signal, faraday's Michelson's interferometer respectively with the optical circulator
Be connected with optoisolator, for single photon signal generate interference, the optoisolator respectively with faraday's Michelson
Interferometer is connected with wavelength division multiplexer, for making single photon signal one-way conduction, which is characterized in that
The transmitting terminal further include: optical circulator, Mach-Zehnder interferometer, photodetector and FPGA, wherein the ring of light shape
Device includes first port, second port and third port, and the first port and second port form first passage, and described second
Port and third port form second channel, and the first port is connected with the voltage-controlled attenuator, the second port and institute
The beam splitter stated in faraday's Michelson's interferometer is connected, and the third port is connected with the Mach-Zehnder interferometer,
It is passed through again for making to be transmitted to the single photon signal interfered in faraday's Michelson's interferometer through the first passage
The second channel is transmitted in the Mach-Zehnder interferometer carries out interference of photons again, the Mach-Zehnder interferometer packet
Include: the first beam splitter and the second beam splitter, first beam splitter and the second beam splitter pass through fiber delay line phase
Even, for single photon signal carry out delay process, the photodetector respectively with second beam splitter and FPGA phase
Even, for being detected to single photon signal and being converted into electric signal.
2. the apparatus according to claim 1, which is characterized in that the receiving end include: wavelength division multiplexer, optoisolator,
The wavelength-division of faraday's Michelson's interferometer and single-photon detector, the wavelength division multiplexer of the receiving end and the transmitting terminal is multiple
It is connected with device by common signal channel, for being transmitted to reception after the single photon signal of the different wave length of transmitting terminal is carried out conjunction beam
End, the optoisolator are connected with the wavelength division multiplexer and faraday's Michelson's interferometer respectively, the single photon detection
Device is connected with faraday's Michelson's interferometer, for detecting to single photon signal.
3. device described in any one of -2 according to claim 1, which is characterized in that the faraday Michael in the receiving end
Inferior interferometer is identical as faraday's Michelson's interferometer structure of the transmitting terminal, includes: first faraday's reflecting mirror, phase
Position modulator, second faraday's reflecting mirror and beam splitter, wherein the first faraday reflecting mirror and the phase-modulator
It is connected, for reflecting single photon signal, the phase-modulator divides with the first faraday reflecting mirror and light respectively
Beam device is connected, and for carrying out phase-modulation to single photon signal, the second faraday reflecting mirror is connect with the beam splitter,
The beam splitter of the transmitting terminal respectively with second faraday's reflecting mirror of the transmitting terminal, phase-modulator, optical circulator and
Optoisolator is connected, the beam splitter of the receiving end second faraday's reflecting mirror, the phase-modulation with the receiving end respectively
Device, optoisolator are connected with single-photon detector, are used to the beam splitting in proportion of a branch of single photon signal.
4. the apparatus according to claim 1, which is characterized in that described device frequency is 50M, the light pulse signal interval
Time is 20ns, and the delay time is 20ns, and the electric signal is voltage signal.
5. a kind of method compensated using the device of any of claims 1-4, which is characterized in that including following
Step:
Step 1: the previous optical pulse propagation issued by Distributed Feedback Laser to the transmitting terminal phase-modulator when, will be described
The voltage of the phase-modulator of transmitting terminal is fixed as 0V, described when latter pulse is transmitted to the phase-modulator of the transmitting terminal
The voltage of the phase-modulator of transmitting terminal is in 0V to V0Variation in range, primary every 0.1V variation, the specific steps are fix one
It is a in 0V to V0The N number of point of voltage scanning changed in range, scanning complete a voltage, count value are obtained, then in 0V to V0Model
It encloses the next voltage of interior fixation to be scanned, then according to interference counting ratio formula
It calculates correspondingThus value obtains the phase voltage load relationship of the phase-modulator of the transmitting terminal, wherein described
Y is indicated are as follows: the count value and previous light pulse and latter optical pulse propagation that each fixed voltage value scans to the transmission
The ratio value of the ratio between count value when the phase-modulator at end loads 0V,Indicate the phase difference of two photons of interference；
Step 2: described device carries out quantum-key distribution, during quantum-key distribution, the phase tune of the transmitting terminal
Device processed every 20ns random loading phase be 0 π, pi/2, π, a phase in 3 pi/2s, the Distributed Feedback Laser issues forward and backward
Light pulse becomes forward and backward light pulse signal through the light intensity modulator, using the voltage-controlled attenuator, by the forward and backward light
Pulse signal is decayed into the forward and backward single photon signal, the first passage of the forward and backward single photon signal through the optical circulator
The faraday's Michelson's interferometer for being transmitted to the transmitting terminal is interfered, forward and backward single photon signal a part after interference
The faraday's Michelson's interferometer for being transmitted to the receiving end through the optoisolator and wavelength division multiplexer carries out quantum key
Distribution, another part, which is transmitted to the Mach-Zehnder interferometer through the second channel of the optical circulator, is interfered, by institute
Single photon after stating Mach-Zehnder interferometer interference, is transmitted to the photodetector and is counted, the FPGA is to detection
Information extracts analysis, is sorted out according to the phase that the transmitting terminal phase-modulator loads, extracts forward and backward pulse and add
Carry the count value N that phase difference is respectively pi/2 and 3 pi/2sA=1,2,3,4,5,6,7,8, count value is calculated；
Step 3: choosing NA=1,2,7,8Count value, if half-wave voltage phase drift angle is 2 θ,
Then:The value for calculating θ obtains the half-wave
The value of 2 θ of voltage drift angle, then the load of the phase voltage according to obtained in step 1 relationship obtains the voltage that need to be compensated
Value, wherein N1Phase for the previous pulse load of the transmitting terminal phase-modulator is pi/2 and transmitting terminal phase-modulator is latter
The count value when phase of pulse load is 0, N2Phase for the previous pulse load of the transmitting terminal phase-modulator is 3 pi/2s
And count value of the phase of transmitting terminal phase-modulator latter pulse load when being 0, N7Before the transmitting terminal phase-modulator
The count value when phase of one pulse load is 0 and the phase of the latter pulse load of transmitting terminal phase-modulator is 3 pi/2, N8For
The phase of the previous pulse load of transmitting terminal phase-modulator is π and the phase of the latter pulse load of transmitting terminal phase-modulator
Count value when for 3 pi/2.
6. according to the method described in claim 5, it is characterized in that, in the step 1, N 10000.
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| CN108462576B (en) * | 2018-03-23 | 2020-12-04 | 华南师范大学 | Local active phase compensation method and system |
| CN110620744B (en) * | 2018-10-17 | 2023-01-10 | 科大国盾量子技术股份有限公司 | QKD (quantum key distribution) polarization state preparation device and method based on phase modulation |
| CN109617688B (en) * | 2019-01-29 | 2021-07-16 | 安徽问天量子科技股份有限公司 | Phase compensation control method for complex environment |
| CN110657795B (en) * | 2019-08-22 | 2021-06-11 | 北京控制工程研究所 | Y waveguide half-wave voltage compensation system of single DAC (digital-to-analog converter) fiber-optic gyroscope |
| CN112865874B (en) * | 2021-01-12 | 2022-07-01 | 上海交通大学 | Self-adaptive decryption optical encryption transmission system and method based on optical self-interference elimination |
| CN112804057B (en) * | 2021-02-02 | 2022-10-25 | 上海循态量子科技有限公司 | Continuous variable quantum key distribution Gaussian modulation implementation device and method |
| CN113765661B (en) * | 2021-09-07 | 2022-08-26 | 安徽问天量子科技股份有限公司 | Dynamic phase voltage tracking method for quantum key distribution |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1742408A2 (en) * | 2005-07-08 | 2007-01-10 | NEC Corporation | Communication system and synchronization control method |
| CN101324441A (en) * | 2008-07-25 | 2008-12-17 | 北京交通大学 | Control system of Mach-Zehnder optical fiber interferometer polarization decline and phase decline |
| CN102739394A (en) * | 2012-06-07 | 2012-10-17 | 中国科学技术大学 | Light quantum phase modulating system |
| CN103178954A (en) * | 2013-03-12 | 2013-06-26 | 华南师范大学 | Method for improving reliability of measurement for half-wave voltage of phase modulators |
| CN103199994A (en) * | 2013-02-19 | 2013-07-10 | 华南师范大学 | Active phase compensation method and device of joint scan |
| CN103929300A (en) * | 2014-04-29 | 2014-07-16 | 华南师范大学 | Attack method based on active phase compensation of one-way quantum key distribution system |
| CN106100837A (en) * | 2015-10-23 | 2016-11-09 | 安徽问天量子科技股份有限公司 | The synchronizer of full duplex quantum key distribution system based on phase co-wavelength and method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4632652B2 (en) * | 2003-10-10 | 2011-02-16 | 日本電気株式会社 | Quantum cryptographic key distribution system and synchronization method used therefor |
-
2016
- 2016-12-30 CN CN201611254402.XA patent/CN106656491B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1742408A2 (en) * | 2005-07-08 | 2007-01-10 | NEC Corporation | Communication system and synchronization control method |
| CN101324441A (en) * | 2008-07-25 | 2008-12-17 | 北京交通大学 | Control system of Mach-Zehnder optical fiber interferometer polarization decline and phase decline |
| CN102739394A (en) * | 2012-06-07 | 2012-10-17 | 中国科学技术大学 | Light quantum phase modulating system |
| CN103199994A (en) * | 2013-02-19 | 2013-07-10 | 华南师范大学 | Active phase compensation method and device of joint scan |
| CN103178954A (en) * | 2013-03-12 | 2013-06-26 | 华南师范大学 | Method for improving reliability of measurement for half-wave voltage of phase modulators |
| CN103929300A (en) * | 2014-04-29 | 2014-07-16 | 华南师范大学 | Attack method based on active phase compensation of one-way quantum key distribution system |
| CN106100837A (en) * | 2015-10-23 | 2016-11-09 | 安徽问天量子科技股份有限公司 | The synchronizer of full duplex quantum key distribution system based on phase co-wavelength and method |
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