CN105867046B - A kind of optical communicating waveband generation device for continuous variable quantum entanglement source and method - Google Patents
A kind of optical communicating waveband generation device for continuous variable quantum entanglement source and method Download PDFInfo
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Abstract
The present invention provides a kind of optical communicating waveband generation device for continuous variable quantum entanglement source and methods, and by the continuous single frequency optical fiber laser of optical communicating waveband, frequency multiplier, signal optical mode cleaner, pumping optical mode cleaner, dichroic mirror, the fully-reflected plane mirror with piezoelectric ceramics, three resonance unsupervised clustering algorithms, crystal temperature effect controller, chamber is long and phase locking system, the one 45 ° of high antiplane mirror and quantum entanglement source detecting system form.The present invention provide it is a kind of it is compact-sized, stability is good, the generation device for continuous variable quantum entanglement source that matches with optical communicating waveband and method, the device directly prepares optical communicating waveband continuous variable quantum entangled source using single three resonance unsupervised clustering algorithm, the wave band quantum tangles source, and transmission loss is only 0.2 dB/km in a fiber, the high-fidelity transfer of information not only may be implemented, and it is compatible with existing optical communication system, become the perfect light source of practical quantum network.
Description
Technical field
The present invention relates to continuous variable quantum optices and quantum information field, specifically a kind of optical communicating waveband continuous variable
Quantum entanglement source generating device and method.
Background technology
Being unique in that between the subsystem of a system for quantum entangled source shows non-localized relevance, to one
The observation of subsystem would necessarily affect the measurement result of other subsystems.Nothing of the continuous variable quantum entangled source due to its preparation
Conditionity, the high efficiency of detection and receive significant attention, have been used for quantum number defect, quantum dense coding and quantum secure
The researchs such as communication.1.5 μm of continuous variable quantum entangled sources of optical communicating waveband also become practical continuous variable quantum information science
The valuable source of research.For practical quantum information network, information needs transmit between different nodes, and light field is as reason
The high-fidelity transfer to information may be implemented in the carrier thought.Optical communicating waveband quantum entangled source due to transmission loss in a fiber only
For 0.2dB/km, the high-fidelity transfer of information not only may be implemented, but also compatible with existing optical communication system, becomes practical
The perfect light source of quantum network.And in practical quantum secret communication, using optical communicating waveband quantum entangled source as light
Source can significantly improve its quantum channel to additional noise tolerance, to improve security key rate, increase transmission range.
Optical parameter amplification at present or optical parametric oscillator process are to generate continuous variable quantum entangled source to have efficacious prescriptions
Method.Document " 10 dB two-mode squeezed vacuum states of light of Stable control of,
Opt. Expres. 21,11546 (2013) " reports the double resonance light based on periodical poled crystal using two degeneracys
It learns parametric oscillator and exports two single-mode squeezing states, producing light in the coupling of 50/50 beam splitter by two single-mode squeezing states leads to
Believe 1.5 μm of continuous variable quantum entangled sources of wave band.But above-mentioned article uses double resonance Degenerate Optical Parametric Oscillator, pumping
Double secondary its inner cavity power density across optical parametric oscillator of light are low, cause the threshold value of optical parametric oscillator very high.Secondly, on
It is to generate quantum entangled source using the compressed state optical field coupling of two optical parametric oscillator outputs to state article, and system is more complex,
And need the position phase locked and chamber with many places, cause the stability of system entirety poor, limits its practical application.
Invention content
The purpose of the present invention is to provide a kind of continuous changes compact-sized, stability is good and optical communicating waveband matches
Measure quantum entanglement source generating device and method, the device and method use single three resonate unsupervised clustering algorithm can be with
Optical communicating waveband continuous variable quantum entangled source is prepared, and background oscillator signal is not needed to the measurement of the quantum entangled source.
A kind of optical communicating waveband generation device for continuous variable quantum entanglement source of the present invention is to use following technical side
What case was realized：A kind of optical communicating waveband generation device for continuous variable quantum entanglement source, including a continuous single-frequency of optical communicating waveband
Optical fiber laser is sequentially equipped with signal optical mode on one emitting light path of the continuous single frequency optical fiber laser of optical communicating waveband
Cleaner, dichroic mirror and three resonance unsupervised clustering algorithms；The continuous single frequency optical fiber laser of optical communicating waveband
Another emitting light path be equipped with frequency multiplier, pumping optical mode cleaner and with pressure is sequentially equipped on the emitting light path of frequency multiplier
The fully-reflected plane mirror of electroceramics；The three resonance unsupervised clustering algorithm is located on the transmitted light path of dichroic mirror；It is double
The position relationship of Look mirror and fully-reflected plane mirror can ensure the light by the outgoing of frequency multiplier through fully-reflected plane mirror and dichroic mirror
It is conllinear with the transmitted light path of dichroic mirror after reflection；The three resonance unsupervised clustering algorithm includes two mirror optical resonances
Chamber, positioned at two mirror optical resonance intracavitary the temperature control furnace that can fine-tune temperature and angle and be placed on non-in temperature control furnace
Linear crystal；The nonlinear crystal is II class Temperature Matching periodical poled crystals；Further include for controlling fully-reflected plane mirror
Reflection angle and two mirror optical resonator chambers length chamber length and phase locking system；Three resonance non-degenerate optical parametric amplifications
The emitting light path of device is equipped with quantum entanglement source detecting system.
Pump light, Injection Signal light (o light and e in optical parametric amplifier are realized by the temperature and angle that adjust crystal
Light) three mode resonance.
The chamber length and phase locking system include the first photodetector, phase modulator, isolator, the spy of the second photoelectricity
Survey device, frequency mixer, signal generator, low-pass filter, lock-in amplifier, proportional plus integral plus derivative controller and high-voltage amplifier；
The phase modulator and isolator sequentially between signal optical mode cleaner and dichroic mirror, are carried by isolator
Take out the branch for the feedback signal for carrying three resonance unsupervised clustering algorithm resonant cavities, first photodetector position
In branch road；The signal output end of first photodetector is connected with frequency mixer signal input part, and signal occurs
The signal output end of device is connected with another signal input part of the signal input part of phase modulator and frequency mixer respectively；
The signal output end of frequency mixer is connected by low-pass filter with a signal input part of proportional plus integral plus derivative controller；
The emitting light path of three resonance unsupervised clustering algorithms is equipped with the one 45 ° of high antiplane mirror, quantum entanglement
Source detecting system is located on the reflected light path of the one 45 ° of high antiplane mirror；It is anti-that second photodetector is located at the one 45 ° of height
On the transmitted light path of plane mirror；The signal output end of second photodetector is connected with the signal input part of lock-in amplifier,
The signal output end of lock-in amplifier is connected with another signal input part of proportional plus integral plus derivative controller, and proportional integration is micro-
The signal output end of sub-controller is connected with the signal input part of high-voltage amplifier, two signal output ends of high-voltage amplifier
The piezoelectric ceramics and the two matched piezoelectric ceramics of mirror optical resonator institute matched respectively with fully-reflected plane mirror are connected.
Further, the signal optical mode cleaner and pumping optical mode cleaner are by two 45 ° high antiplane mirror
It is constituted for the concave mirror of 1m with a radius of curvature, three mirror annular passive resonant cavities of composition, a length of 1.03m of chamber, resonant cavity is fine
Degree is 500.
The laser filtered is coupled into resonant cavity by first 45 ° high antiplane mirror, passes through second 45 ° of height respectively
Antiplane mirror, concave mirror and first 45 ° high antiplane mirror form light path closure and in intracavitary resonance, then through second 45 ° of height
Antiplane mirror exports, and realizes Injection Signal light and pump light spatial model and volume to three resonance unsupervised clustering algorithms
The filtering of outer noise.
The chamber length and phase locking system is for realizing to three resonance unsupervised clustering algorithm resonators
The locking of length, Injection Signal light and pump light with respect to position phase.
Further, the continuous single frequency optical fiber laser shoot laser centre wavelength of optical communicating waveband is 1.5 μm, times
Frequency device is made of two mirror optical resonators and I class Temperature Matching periodical poled crystals, and the laser center wavelength of frequency multiplier outgoing is
775nm。
A kind of optical communicating waveband continuous variable quantum entanglement source generating method of the present invention is to use following technical side
What case was realized：A kind of optical communicating waveband continuous variable quantum entanglement source generating method, includes the following steps：（a）Optical communicating waveband
Continuous single frequency optical fiber laser is used for pumping frequency multiplier, obtains the company after frequency multiplication as laser light source, a laser part for output
Continuous single-frequency laser；Another part laser is filtered the spatial model of laser, is reduced it and additionally make an uproar by signal optical mode cleaner
Sound；The continuous single-frequency laser of frequency multiplier outgoing filters the spatial model of laser, reduces it additionally by pumping optical mode cleaner
Noise；（b）After above-mentioned two beams laser is by dichroic mirror, three resonance unsupervised clustering algorithms are injected, respectively as three
The Injection Signal light field and pumping light field of resonance unsupervised clustering algorithm；Fully-reflected plane mirror is for controlling Injection Signal
The opposite position phase of light field and pump light；Injection Signal light is incident on three resonance non-degenerate optical parametric amplifications with 45 ° of polarization directions
Device, the light beam enter after II class Temperature Matching periodical poled crystals the two-beam o light and e for resolving into the identical polarized orthogonal of frequency
Light；The temperature for accurately controlling nonlinear crystal reaches optimum temperature matching condition, and o light and e light are in three resonance nondegenerate light at this time
Parameter amplifier intracavitary is learned to resonate simultaneously；By fine-tuning the rotation angle of nonlinear crystal, change nonlinear crystal three
The effective optical length for the unsupervised clustering algorithm intracavitary that resonates, to compensate dispersion so that pump light and above-mentioned two beam
Light resonates simultaneously in three resonance unsupervised clustering algorithm intracavitary, realizes three resonance conditions（Three resonance nondegenerate light at this time
The power density for learning parameter amplifier intracavity pump light is very high, the threshold value of effective relatively low optical parametric oscillator, while obtaining high
Classical Gain）；（c）Transit chamber is grown and the chamber length of three resonance unsupervised clustering algorithms is locked in note by phase locking system
Enter on the resonant frequency of signal beams, the relative phase of Injection Signal light and pump light is locked in π, at this time three resonance nondegenerates
Optical parametric amplifier runs on anti-magnifying state, exports the Quantum Entangled States light field with amplitude anticorrelation, position phase positive association；
（d）The Quantum Entangled States light field of output enters quantum entanglement source detecting system, is exported using Bell's state direct detection systematic survey
The quantum entanglement degree of light field.
The continuous variable quantum entangled source production that a kind of optical communicating waveband that the present invention designs compared with prior art matches
Generating apparatus and method have the following advantages：
1.5 μm of generation device for continuous variable quantum entanglement source of optical communicating waveband that the present invention designs, due to the wave band quantum
Tangling source, transmission loss is only 0.2dB/km in a fiber, not only may be implemented the high-fidelity transfer of information, and with it is existing
Optical communication system is compatible with, and becomes the perfect light source of practical quantum network.
The present invention is dropped the noise of 1.5 μm and 775nm laser light sources using high-precision narrow bandwidth optical mode cleaner
Down to shot noise limit, existing 1.5 μm of laser light source noises are all far above shot noise limit substantially, this is 1.5 μm of amounts
Son tangles source and prepares the main reason for developing slowly.This method effectively reduces the additional noise of laser light source, improves 1.5 μm
The degree of entanglement of quantum entangled source.
The present invention devises the simple mechanism that single three resonance unsupervised clustering algorithm generates quantum entangled source, leads to
Three mode resonance in optical parameter enlarged cavity can be thus achieved in the temperature and angle for crossing control II class Temperature Matching PPKTP crystal.
When optical parametric amplifier runs on anti-magnifying state, the two-beam wavelength of optical parametric amplifier output is 1.5 μm inclined
It shakes orthogonal, is the bright entangled light of orthogonal amplitude anticorrelation, orthogonal position phase positive association.Under identical pump power, pumping
Three resonant conditions that light also resonates more easily reach threshold value, obtain higher Classical Gain.
In short, a kind of optical communicating waveband generation device for continuous variable quantum entanglement source and method that the present invention designs have
Simple in structure, the advantages that system is stable, compatible with existing optical communication system, has important in practical quantum information field
Application value.
Description of the drawings
Fig. 1 is a kind of functional block diagram of optical communicating waveband generation device for continuous variable quantum entanglement source of the present invention, in figure：
The continuous single frequency optical fiber laser of 1- optical communicating wavebands, 2- frequency multipliers, 3- signal optical mode cleaners, 4- pump optical mode cleaning
Device, 5- dichroic mirrors, 6- fully-reflected plane mirrors, the resonance unsupervised clustering algorithms of 7- tri-, 8- crystal temperature effect controllers, 9- chambers
Long and phase locking system, the one 45 ° of high antiplane mirror of 10-, 11- quantum entanglement source detecting systems.
Fig. 2 is the structural schematic diagram of optical communicating waveband generation device for continuous variable quantum entanglement source of the present invention, figure
In：The first photodetectors of 90-, 91- phase modulators, 92- isolators, the second photodetectors of 93-, 94- frequency mixers, 95-
Signal generator, 96- low-pass filters, 97- lock-in amplifiers, 98- proportional plus integral plus derivative controllers, 99- high-voltage amplifiers.
Fig. 3 is three resonance nondegenerate light of optical communicating waveband generation device for continuous variable quantum entanglement source of the present invention
The schematic diagram for learning parameter amplifier, in figure：71- two dimensions are adjustable mirror holder, 72- plano-concave mirrors, 73- nonlinear crystals and its temperature control furnace,
74- horizontal translation framves, 75- vertical translation framves, 76- precision rotation adjusting brackets, 77- invar plates.
Fig. 4 is Injection Signal optical output power situation of change in three resonance unsupervised clustering algorithms.
Fig. 5 is that a kind of optical communicating waveband generation device for continuous variable quantum entanglement source of the present invention is obtaining 1.5 μm of light fields just
Hand over the Quantum Correlation noise spectrum of amplitude component sum.
Fig. 6 is that a kind of optical communicating waveband generation device for continuous variable quantum entanglement source of the present invention is obtaining 1.5 μm of light fields just
Hand over the Quantum Correlation noise spectrum of position phase component difference.
Specific implementation mode
Further explanation is made to the present invention below in conjunction with the accompanying drawings：
Fig. 1 is a kind of functional block diagram of optical communicating waveband generation device for continuous variable quantum entanglement source of the present invention, and use is defeated
Go out the continuous single frequency optical fiber laser 1 of optical communicating waveband that wavelength is 1.5 μm and is used as laser light source, the laser one of laser output
Divide and be used for pumping frequency multiplier 2, obtains the continuous single-frequency lasers of 775nm；Another part laser passes through signal optical mode cleaner 3, mistake
It filters the spatial model of laser, reduce its additional noise.The continuous single-frequency lasers of 775nm are swashed by pumping optical mode cleaner 4, filtering
The spatial model of light reduces its additional noise.Wavelength be 1.5 μm and two beam laser of 775nm by dichroic mirror 5 after, inject three
Resonate unsupervised clustering algorithm 7, respectively as three resonance unsupervised clustering algorithms 7 Injection Signal light field and
Pump light field.Fully-reflected plane mirror 6 with piezoelectric ceramics is for controlling Injection Signal light field and the opposite position phase of pump light.Injection
Signal light is incident on three resonance unsupervised clustering algorithms with 45 ° of polarization directions, and light beam enters II class Temperature Matchings PPKTP
The two-beam o light and e light of the identical polarized orthogonal of frequency are resolved into after crystal.PPKTP is accurately controlled by crystal temperature effect controller 8
Crystal（II class Temperature Matching periodical poled crystals）Temperature reach optimum temperature matching condition, o light and e light are in Optical Parametric at this time
It resonates simultaneously in amount amplifier chamber；By fine-tuning the rotation angle of crystal, change crystal in three resonance nondegenerate Optical Parametrics
The effective optical length for measuring 7 intracavitary of amplifier, to compensate dispersion so that pump light is total simultaneously in intracavitary with above-mentioned two-beam
It shakes, realizes three resonance conditions.The power density of three resonance unsupervised clustering algorithm intracavity pump light is very high at this time, effectively
The threshold value of relatively low optical parametric oscillator, while obtaining high Classical Gain.Transit chamber is grown and phase locking system 9 is non-by three resonance
The chamber length of degenerate optical parametric amplifier is locked on the resonant frequency of Injection Signal light beam, by Injection Signal light and pump light
Relative phase is locked in π, and three resonance unsupervised clustering algorithms run on anti-magnifying state at this time, and the light field of output has
The quantum entanglement characteristic of amplitude anticorrelation, position phase positive association.The Quantum Entangled States light field of output passes through the one 45 ° of high antiplane mirror
10 are reflected into quantum entanglement source detecting system 11, using the quantum entanglement of Bell's state direct detection systematic survey output light field
Degree need not introduce background oscillation light and balance homodyne detection system, so as to avoid the shake and interference of background oscillation light
Influence of the visibility to detection.
The specific light path of optical communicating waveband generation device for continuous variable quantum entanglement source is as shown in Fig. 2, 1.5 μm of optic communication
The continuous single frequency optical fiber laser of wave band 1 is 1.5 μm of continuous single-frequency light that the output power of NP Photonics companies production is 2W
Fibre laser.Frequency multiplier 2 is that the two mirror standing-wave cavities that the plano-concave mirror that two radius of curvature are 30 mm is constituted match period pole with I classes
Change lithium columbate crystal composition, for shg efficiency up to 86%, output frequency multiplication optical wavelength is 775nm.Due to the laser of optical fiber laser output
And there is the additional noise far above tens dB of shot noise limit in frequency doubled light, need to use signal optical mode cleaner 3 and pump
Pu optical mode cleaner 4 filters its additional noise, and pattern cleaner is the three mirror annular passive resonant cavities of a length of 1.03m of chamber,
Resonance fineness of cavity is 500.Filtered signal light and pump light just reach shot noise limit at analysis frequency 4MHz.Its
Middle Injection Signal light carries out the light field for being incident on three resonance unsupervised clustering algorithms, 7 intracavitary by phase modulator 91
Modulation by isolator 92 so that light path unidirectionally passes through, and extracts the reflected light for carrying resonant cavity signal, by the first photoelectricity
Detector 90 detects the reflected light and is converted to electric signal；The modulated signal of the signal and signal generator 95 passes through frequency mixer 94
It is mixed, after low-pass filter 96 filters, generates error signal；Error signal inputs the PID control parameter of multichannel
Device 98 is loaded error signal in three resonance unsupervised clustering algorithm hysteroscopes by twin-channel high-voltage amplifier 99
On piezoelectric ceramics, to realize the locking of optical parametric amplifier chamber length.Three resonance 7 output lights of unsupervised clustering algorithm
The one 45 ° of high antiplane mirror 10 is passed through in field, and about 1% output light field power is transmitted by the one 45 ° high antiplane mirror 10, equally
The transmitted light is detected by the second photodetector 93 and is converted to electric signal；The signal is believed with the modulation inside lock-in amplifier 97
Number mixing demodulation output error signal, error signal input multichannel proportional plus integral plus derivative controller 98, by twin-channel
High-voltage amplifier 99 loads error signal on the piezoelectric ceramics of fully-reflected plane mirror 6, realizes Injection Signal light and pump light
The locking of relative phase.Three resonance 7 output light fields of unsupervised clustering algorithm are reflected by the one 45 ° high antiplane mirror 10
It is detected into quantum entanglement source detecting system 11, process is as follows：The light field of output is due to polarized orthogonal, by polarization beam splitting
Prism is separated, and position phase control is added and by the opposite phase locking of two light after pi/2 in light beam, using a polarization beam splitting
Prism synthesizes, and is interfered on 50/50 beam splitter that a set of half-wave plate and polarization beam splitter prism form, it is seen that degree is defeated up to 99%
Go out two light beams to be detected by the photodetector of low noise high-gain, the AC signal of detector is by adder-subtractor input frequency
Spectrum analysis instrument, electric current and rise and fall as Quantum Entangled States optical field amplitude and correlated noise, it is Quantum Entangled States light that current difference, which rises and falls,
Field position differs correlated noise.It is being exported when shot noise limit is by there was only Injection Signal light situation with bright entangled power
Consistent coherent light provides.
The schematic diagram of three resonance unsupervised clustering algorithms 7 is as shown in figure 3, two plano-concave mirrors 72 are both placed in two dimension
Two-dimensional adjustment is realized on adjustable mirror holder 71, constitutes resonant cavity.Nonlinear crystal is placed on the temperature control that the poly- phenol material of heat preservation makes
In stove, accurate temperature controlling is realized by crystal temperature effect controller 8；Horizontal translation frame 74 and vertical translation frame 75 realize that crystal water is gentle and hang down
The accurate adjusting of straight both direction, precision rotation adjusting bracket 76 realize the fine adjustment of crystal angle.Whole device is fixed on thickness
Degree is to improve the stability of system on the invar plate 77 of 30mm.
Fig. 4 is that the variation for the three resonance unsupervised clustering algorithm Injection Signal optical output powers that Germicidal efficacy arrives is bent
Line.It can be seen that when scanning Injection Signal light and pump light relative phase changes between 0 ~ π, when no pump light injects,
Injection Signal optical output power does not change；When there is pump light, Injection Signal optical output power is in maximum and minimum
Between alternately change, i.e., three resonance unsupervised clustering algorithms have realized three mode resonance at this time, and run on amplification and anti-
Amplify alternate state, Classical Gain is about 40 times.
Fig. 5 is the noise power spectrum for the optical parametric amplifier output light field orthogonal amplitude sum that experiment measures.In analysis frequency
Rate is at 7MHz, and the degree of association of light field orthogonal amplitude sum is less than shot noise limit 5.2dB, and Electronics noice is less than shot at this time
Noise floor 12dB can be neglected.
Fig. 6 is the noise power spectrum for the orthogonal position difference of optical parametric amplifier output light field that experiment measures.In analysis frequency
Rate is at 7MHz, and the degree of association of the orthogonal position difference of light field is less than shot noise limit 5.2dB, and Electronics noice is less than shot at this time
Noise floor 12dB can be neglected.
Claims (8)
1. a kind of optical communicating waveband generation device for continuous variable quantum entanglement source, including a continuous single frequency fiber of optical communicating waveband
Laser（1）, which is characterized in that the continuous single frequency optical fiber laser of optical communicating waveband（1）An emitting light path on sequentially
Equipped with signal optical mode cleaner（3）, dichroic mirror（5）And three resonance unsupervised clustering algorithm（7）；The optic communication
The continuous single frequency optical fiber laser of wave band（1）Another emitting light path be equipped with frequency multiplier（2）, frequency multiplier（2）Emitting light path
On sequentially be equipped with pumping optical mode cleaner（4）With the fully-reflected plane mirror with piezoelectric ceramics（6）；Using high-precision narrow bandwidth of light
The noise of 1.5 μm and 775nm laser light sources is reduced to shot noise limit by pattern cleaner；The three resonance nondegenerate
Optical parametric amplifier（7）Positioned at dichroic mirror（5）Transmitted light path on；Dichroic mirror（5）With fully-reflected plane mirror（6）Position close
System can ensure by frequency multiplier（2）The light of outgoing is through fully-reflected plane mirror（6）And dichroic mirror（5）After reflection with dichroic mirror（5）'s
Transmitted light path is conllinear；The three resonance unsupervised clustering algorithm（7）Including two mirror optical resonators, it is located at two mirror optics
The temperature control furnace that can fine-tune temperature and angle in resonant cavity and the nonlinear crystal being placed in temperature control furnace；Two flat
Concave mirror（72）It is both placed in the adjustable mirror holder of two dimension（71）Upper realization two-dimensional adjustment constitutes resonant cavity；Nonlinear crystal is placed on guarantor
In the temperature control furnace that the poly- phenol material of temperature makes, by crystal temperature effect controller（8）Realize accurate temperature controlling；Horizontal translation frame（74）With hang down
Straight pan carriage（75）Realize the accurate adjusting of crystal horizontal and vertical directions, precision rotation adjusting bracket（76）Realize crystal angle
The fine adjustment of degree；Pass through crystal temperature effect controller（8）The temperature for accurately controlling PPKTP crystal reaches optimum temperature matching item
Part, o light and e light resonate simultaneously in optical parametric amplifier intracavitary at this time；By fine-tuning the rotation angle of crystal, change brilliant
Body is in three resonance unsupervised clustering algorithms（7）Effective optical length of intracavitary, to compensate dispersion so that pump light with
Above-mentioned two-beam resonates simultaneously in intracavitary, realizes three resonance conditions；The nonlinear crystal is that II class Temperature Matchings are period polarized
Crystal；Further include for controlling fully-reflected plane mirror（6）Reflection angle and two mirror optical resonator chambers length chamber is long and position
Phase locking system（9）；Injection Signal light passes through phase modulator（91）To being incident on three resonance unsupervised clustering algorithms
（7）The light field of intracavitary is modulated, and passes through isolator（92）So that light path unidirectionally passes through, and extracts and carry resonant cavity signal
Reflected light；Three resonance unsupervised clustering algorithms（7）Emitting light path be equipped with quantum entanglement source detecting system（11）.
2. a kind of optical communicating waveband generation device for continuous variable quantum entanglement source as described in claim 1, which is characterized in that institute
State chamber length and phase locking system（9）Including the first photodetector（90）, phase modulator（91）, isolator（92）, second
Photodetector（93）, frequency mixer（94）, signal generator（95）, low-pass filter（96）, lock-in amplifier（97）, ratio product
Divide derivative controller（98）And high-voltage amplifier（99）；
The phase modulator（91）And isolator（92）Sequentially it is located at signal optical mode cleaner（3）And dichroic mirror（5）Between,
By isolator（92）Extract the branch for the feedback signal for carrying three resonance unsupervised clustering algorithm resonant cavities, described the
One photodetector（90）Positioned at branch road；First photodetector（90）Signal output end and frequency mixer（94）One
Signal input part is connected, signal generator（95）Signal output end respectively with phase modulator（91）Signal input part with
And frequency mixer（94）Another signal input part be connected；Frequency mixer（94）Signal output end pass through low-pass filter（96）
With proportional plus integral plus derivative controller（98）A signal input part be connected；
Three resonance unsupervised clustering algorithms（7）Emitting light path be equipped with the one 45 ° of high antiplane mirror（10）, quantum entangles
Twine source detecting system（11）Positioned at the one 45 ° of high antiplane mirror（10）Reflected light path on；Second photodetector（93）
Positioned at the one 45 ° of high antiplane mirror（10）Transmitted light path on；Second photodetector（93）Signal output end put with locking phase
Big device（97）Signal input part be connected, lock-in amplifier（97）Signal output end and proportional plus integral plus derivative controller（98）
Another signal input part be connected, proportional plus integral plus derivative controller（98）Signal output end and high-voltage amplifier（99）'s
Signal input part is connected, high-voltage amplifier（99）Two signal output ends respectively with fully-reflected plane mirror（6）The pressure matched
Electroceramics and the two matched piezoelectric ceramics of mirror optical resonator institute are connected.
3. a kind of optical communicating waveband generation device for continuous variable quantum entanglement source as claimed in claim 2, which is characterized in that institute
State signal optical mode cleaner（3）With pumping optical mode cleaner（4）By two 45 ° high antiplane mirror and a radius of curvature
It is constituted for the concave mirror of 1m, forms three mirror annular passive resonant cavities, a length of 1.03m of chamber, resonance fineness of cavity is 500.
4. special such as a kind of optical communicating waveband generation device for continuous variable quantum entanglement source of claim 1 ~ 3 any one of them
Sign is, the continuous single frequency optical fiber laser of optical communicating waveband（1）Shoot laser centre wavelength is 1.5 μm, the frequency multiplier（2）
It is made of two mirror optical resonators and I class Temperature Matching periodical poled crystals, frequency multiplier（2）The laser center wavelength of outgoing is
775nm。
5. special such as a kind of optical communicating waveband generation device for continuous variable quantum entanglement source of claim 1 ~ 3 any one of them
Sign is that the temperature of temperature control furnace passes through crystal temperature effect controller connected to it（8）Control.
6. a kind of optical communicating waveband generation device for continuous variable quantum entanglement source as claimed in claim 4, which is characterized in that control
The temperature of warm stove passes through crystal temperature effect controller connected to it（8）Control.
7. a kind of optical communicating waveband continuous variable quantum entanglement source generating method, special using device as described in claim 1
Sign is, includes the following steps：（a）The continuous single frequency optical fiber laser of optical communicating waveband（1）As laser light source, the laser of output
A part is used for pumping frequency multiplier（2）, obtain the continuous single-frequency laser after frequency multiplication；Another part laser is clear by signal optical mode
Clean device（3）, filter the spatial model of laser, reduce its additional noise；Frequency multiplier（2）The continuous single-frequency laser of outgoing passes through pumping
Optical mode cleaner（4）, filter the spatial model of laser, reduce its additional noise；（b）Above-mentioned two beams laser passes through dichroic mirror
（5）Afterwards, three resonance unsupervised clustering algorithms are injected（7）, respectively as three resonance unsupervised clustering algorithms
（7）Injection Signal light field and pumping light field；Fully-reflected plane mirror（6）For controlling the opposite of Injection Signal light field and pump light
Position phase；Injection Signal light is incident on three resonance unsupervised clustering algorithms with 45 ° of polarization directions（7）, which enters II
The two-beam o light and e light of the identical polarized orthogonal of frequency are resolved into after class Temperature Matching periodical poled crystal；It accurately controls non-linear
The temperature of crystal reaches optimum temperature matching condition, and o light and e light are in three resonance unsupervised clustering algorithms at this time（7）Chamber
It is interior to resonate simultaneously；By fine-tuning the rotation angle of nonlinear crystal, change nonlinear crystal in three resonance nondegenerate optics
Parameter amplifier（7）Effective optical length of intracavitary, to compensate dispersion so that pump light is non-in three resonance with above-mentioned two-beam
Degenerate optical parametric amplifier（7）Intracavitary resonates simultaneously, realizes three resonance conditions；（c）Transit chamber is grown and phase locking system（9）
By three resonance unsupervised clustering algorithms（7）Chamber length be locked on the resonant frequency of Injection Signal light beam, will injection letter
The relative phase of number light and pump light is locked in π, at this time three resonance unsupervised clustering algorithms（7）Run on anti-amplification shape
State exports the Quantum Entangled States light field with amplitude anticorrelation, position phase positive association；（d）The Quantum Entangled States light field of output enters
Quantum entanglement source detecting system（11）, using the quantum entanglement degree of Bell's state direct detection systematic survey output light field.
8. a kind of optical communicating waveband continuous variable quantum entanglement source generating method as claimed in claim 7, which is characterized in that institute
State the continuous single frequency optical fiber laser of optical communicating waveband（1）Shoot laser centre wavelength is 1.5 μm, frequency multiplier（2）The laser of outgoing
Centre wavelength is 775nm.
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