CN105867046A - Device and method for generating photo-communication waveband continuous variable quantum entanglement source - Google Patents
Device and method for generating photo-communication waveband continuous variable quantum entanglement source Download PDFInfo
- Publication number
- CN105867046A CN105867046A CN201610382879.XA CN201610382879A CN105867046A CN 105867046 A CN105867046 A CN 105867046A CN 201610382879 A CN201610382879 A CN 201610382879A CN 105867046 A CN105867046 A CN 105867046A
- Authority
- CN
- China
- Prior art keywords
- resonance
- light
- optical
- mirror
- quantum entanglement
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000004891 communication Methods 0.000 title abstract description 11
- 230000003287 optical effect Effects 0.000 claims abstract description 85
- 239000013078 crystal Substances 0.000 claims abstract description 35
- 239000013307 optical fiber Substances 0.000 claims abstract description 17
- 239000000919 ceramic Substances 0.000 claims abstract description 10
- 238000001514 detection method Methods 0.000 claims abstract description 7
- 238000002347 injection Methods 0.000 claims description 26
- 239000007924 injection Substances 0.000 claims description 26
- 230000010287 polarization Effects 0.000 claims description 6
- 238000005086 pumping Methods 0.000 claims description 6
- 230000002277 temperature effect Effects 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 4
- 239000006185 dispersion Substances 0.000 claims description 3
- 230000009897 systematic effect Effects 0.000 claims description 3
- 208000002925 dental caries Diseases 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 abstract description 5
- 239000000835 fiber Substances 0.000 abstract description 3
- 230000001276 controlling effect Effects 0.000 description 6
- 238000001228 spectrum Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000013519 translation Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 229910001374 Invar Inorganic materials 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
- 230000002596 correlated effect Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- GQYHUHYESMUTHG-UHFFFAOYSA-N lithium niobate Chemical compound [Li+].[O-][Nb](=O)=O GQYHUHYESMUTHG-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 150000008442 polyphenolic compounds Polymers 0.000 description 1
- 235000013824 polyphenols Nutrition 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
- G02F1/39—Non-linear optics for parametric generation or amplification of light, infrared or ultraviolet waves
Landscapes
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lasers (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The invention provides a device and a method for generating a photo-communication waveband continuous variable quantum entanglement source. The device comprises a photo-communication waveband continuous single-frequency fiber laser, a frequency multiplier, a signal light mode cleaner, a pump light mode cleaner, a dichroic mirror, a total reflection plane mirror with piezoelectric ceramics, a three-resonance non-degeneracy optical parametric amplifier, a crystal temperature controller, a cavity length and phase locking system, a first 45-degree high reflecting plane mirror and a quantum entanglement source detection system. According to the device and the method for generating the continuous variable quantum entanglement source, the device has a compact structure, is high in stability and is matched with the photo-communication waveband; the device adopts a single three-resonance non-degeneracy optical parametric amplifier for directly preparing the photo-communication waveband continuous variable quantum entanglement source, and the transmission loss of the waveband quantum entanglement source in optical fiber is only 0.2dB/km, so that the high fidelity transmission of information is realized; and the device is compatible with the present photo-communication system, so that the quantum entanglement source can become a perfect light source of a 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 generation device for continuous variable quantum entanglement source and method.
Background technology
Show non-localized relatedness between the subsystem being unique in that a system of quantum entangled source, the observation of a subsystem be would necessarily affect the measurement result of other subsystems.Unconditionality, the high efficiency of detection that continuous variable quantum entangled source is prepared due to it and receive significant attention, have been used for quantum number defect, quantum dense coding and quantum secret communication etc. are studied.Optical communicating waveband 1.5 μm continuous variable quantum entangled source also becomes the valuable source of practical continuous variable quantum information science research.For practical quantum information network, information needs to transmit between different nodes, and light field can realize the high-fidelity transfer to information as preferable carrier.Optical communicating waveband quantum entangled source is only 0.2dB/km due to loss in a fiber, is possible not only to realize the high-fidelity transfer of information, and compatible with existing optical communication system, becomes the perfect light source of practical quantum network.And in practical quantum secret communication, utilize optical communicating waveband quantum entangled source can significantly improve its quantum channel to additional noise tolerance as light source, thus improve safe key speed, increase transmission range.
Optical parameter amplifies or optical parametric oscillator process is to produce the effective ways of continuous variable quantum entangled source at present.Document " Stable control of 10 dB
Two-mode squeezed vacuum states of light, Opt. Expres. 21,11546 (2013) " report utilize two degeneracys doubly resonant optical parametric oscillator based on periodical poled crystal output two single-mode squeezing states, by two single-mode squeezing states 50/50 beam splitter coupling create optical communicating waveband 1.5 μm continuous variable quantum entangled source.But, above-mentioned article uses double resonance Degenerate Optical Parametric Oscillator, and it is low that pump light passes its inner chamber power density of optical parametric oscillator double times, and the threshold value causing optical parametric oscillator is the highest.Secondly, above-mentioned article is that the compressed state optical field coupling using two optical parametric oscillator outputs produces quantum entangled source, and system is more complicated, and needs position phase and the Chang You many places, chamber of locking, causes the less stable that system is overall, limits its actual application.
Summary of the invention
It is an object of the invention to provide a kind of compact conformation, generation device for continuous variable quantum entanglement source that good stability matches with optical communicating waveband and method, this device and method uses single three resonance unsupervised clustering algorithm can prepare optical communicating waveband continuous variable quantum entangled source, and the measurement to this quantum entangled source need not background oscillator signal.
A kind of optical communicating waveband generation device for continuous variable quantum entanglement source of the present invention adopts the following technical scheme that realization: a kind of optical communicating waveband generation device for continuous variable quantum entanglement source, including a continuous single frequency optical fiber laser of optical communicating waveband, an emitting light path of the continuous single frequency optical fiber laser of described optical communicating waveband is sequentially provided with flashlight pattern cleaner, dichroic mirror and three resonance unsupervised clustering algorithm；Another emitting light path of the continuous single frequency optical fiber laser of described optical communicating waveband is provided with doubler, and the emitting light path of doubler is sequentially provided with pump light pattern cleaner and the fully-reflected plane mirror of band piezoelectric ceramics；Described three resonance unsupervised clustering algorithm are positioned on the transmitted light path of dichroic mirror；The position relationship of dichroic mirror and fully-reflected plane mirror ensure that the light by the outgoing of doubler after fully-reflected plane mirror and dichroic mirror reflect with the transmitted light path conllinear of dichroic mirror；Described three resonance unsupervised clustering algorithm include two mirror optical resonators, be positioned at two mirror optical resonance intracavity temperature and the temperature control furnace of angle and the nonlinear crystal that be placed in temperature control furnace can be fine-tuned；Described nonlinear crystal is II class Temperature Matching periodical poled crystal；Also include the reflection angle for controlling fully-reflected plane mirror and the chamber length of two mirror optical resonator chamber length and phase locking system；The emitting light path of three resonance unsupervised clustering algorithm is provided with quantum entanglement source detecting system.
Temperature and angle by regulation crystal realize pump light in optical parametric amplifier, Injection Signal light (o light and e light) three mode resonance.
Described chamber length and phase locking system include the first photodetector, phase modulator, isolator, the second photodetector, frequency mixer, signal generator, low pass filter, lock-in amplifier, proportional plus integral plus derivative controller and high-voltage amplifier；
Described phase modulator and isolator, sequentially between flashlight pattern cleaner and dichroic mirror, are extracted the branch road of the feedback signal carrying three resonance unsupervised clustering algorithm resonator cavitys by isolator, and described first photodetector is positioned on this branch road；The signal output part of the first photodetector is connected with frequency mixer signal input part, and the signal output part of signal generator is connected with the signal input part of phase modulator and another signal input part of frequency mixer respectively；The signal output part of frequency mixer is connected with a signal input part of proportional plus integral plus derivative controller by low pass filter；
The emitting light path of three resonance unsupervised clustering algorithm is provided with the one 45 ° of high antiplane mirror, and quantum entanglement source detecting system is positioned on the reflected light path of the one 45 ° of high antiplane mirror；Described second photodetector is positioned on the transmitted light path of the one 45 ° of high antiplane mirror；The signal output part of the second photodetector is connected with the signal input part of lock-in amplifier, the signal output part of lock-in amplifier is connected with another signal input part of proportional plus integral plus derivative controller, the signal output part of proportional plus integral plus derivative controller is connected with the signal input part of high-voltage amplifier, and piezoelectric ceramics that two signal output parts of high-voltage amplifier are joined with fully-reflected plane mirror respectively and the piezoelectric ceramics that two mirror optical resonators are mated are connected.
Further, described flashlight pattern cleaner and pump light pattern cleaner are constituted by the concave mirror that two 45 ° high antiplane mirrors and radius of curvature are 1m, form three mirror annular passive resonant cavities, a length of 1.03m in chamber, and resonator cavity fineness is 500.
The laser filtered is coupled into resonator cavity through first 45 ° high antiplane mirror, close be incorporated in intracavity resonance respectively through second 45 ° high antiplane mirror, concave mirror and first 45 ° high antiplane mirrors formation light path, export through second 45 ° high antiplane mirror again, it is achieved the Injection Signal light of the unsupervised clustering algorithm that resonate to three and pump light spatial model and the filtration of additional noise.
Described chamber length and phase locking system are for realizing three resonance unsupervised clustering algorithm resonator length, Injection Signal light and the locking of pump light phase para-position phase.
Further, optical communicating waveband continuous single frequency optical fiber laser shoot laser centre wavelength is 1.5 μm, and described doubler is made up of two mirror optical resonators and I class Temperature Matching periodical poled crystal, and the laser center wavelength of doubler outgoing is 775nm.
A kind of optical communicating waveband continuous variable quantum entanglement source generating method of the present invention adopts the following technical scheme that realization: a kind of optical communicating waveband continuous variable quantum entanglement source generating method, comprise the steps: that the continuous single frequency optical fiber laser of (a) optical communicating waveband is as LASER Light Source, a laser part for output is for pumping doubler, it is thus achieved that the continuous single-frequency laser after frequency multiplication；Another part laser passes through flashlight pattern cleaner, filters the spatial model of laser, reduces its additional noise；The continuous single-frequency laser of doubler outgoing passes through pump light pattern cleaner, filters the spatial model of laser, reduces its additional noise；B () above-mentioned two bundle laser, by after dichroic mirror, all inject three resonance unsupervised clustering algorithm, respectively as Injection Signal light field and the pumping light field of three resonance unsupervised clustering algorithm；Fully-reflected plane mirror is for controlling the phase para-position phase of Injection Signal light field and pump light；Injection Signal light incides three resonance unsupervised clustering algorithm with 45 ° of polarization directions, and this light beam resolves into two-beam o light and the e light of the identical polarized orthogonal of frequency after entering II class Temperature Matching periodical poled crystal；The temperature accurately controlling nonlinear crystal reaches optimum temperature matching condition, and now o light and e light resonate at three resonance unsupervised clustering algorithm intracavity simultaneously；By the anglec of rotation of nonlinear crystal is fine-tuned, change the nonlinear crystal effective optical length at three resonance unsupervised clustering algorithm intracavity, thus compensate dispersion, pump light is resonated at three resonance unsupervised clustering algorithm intracavity with above-mentioned two-beam simultaneously, (now the power density of three resonance unsupervised clustering algorithm intracavity pump light is the highest to realize three resonance conditions, the threshold value of effective relatively low optical parametric oscillator, obtains high Classical Gain simultaneously)；C the chamber length of three resonance unsupervised clustering algorithm is locked on the resonant frequency of Injection Signal light beam by () by chamber length and phase locking system, the relative phase of Injection Signal light and pump light is locked in π, now three resonance unsupervised clustering algorithm run on anti-magnifying state, and output has amplitude anticorrelation, the Quantum Entangled States light field of position phase positive association；D Quantum Entangled States light field that () exports enters quantum entanglement source detecting system, uses the quantum entanglement degree of Bel's state direct detection systematic survey output light field.
Generation device for continuous variable quantum entanglement source and method that compared with prior art a kind of optical communicating waveband of present invention design matches have the following advantages:
The optical communicating waveband 1.5 μm generation device for continuous variable quantum entanglement source of present invention design, it is only 0.2dB/km owing to this wave band quantum tangles source loss in a fiber, it is possible not only to realize the high-fidelity transfer of information, and compatible with existing optical communication system, become the perfect light source of practical quantum network.
The present invention uses high accuracy narrow bandwidth optical mode cleaner that the noise of 1.5 μm and 775nm LASER Light Source is reduced to shot noise limit, existing 1.5 μm LASER Light Source noises are the most all far above shot noise limit, and this is the main cause that 1.5 μm quantum entangled sources prepare slower development.The method effectively reduces the additional noise of LASER Light Source, improves the degree of entanglement of 1.5 μm quantum entangled sources.
The present invention devises single three resonance unsupervised clustering algorithm and produces the simple mechanism of quantum entangled source, i.e. can realize the three mode resonance in optical parameter enlarged cavity by the temperature and angle controlling 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 mu m polarized orthogonals, is orthogonal amplitude anticorrelation, the bright entangled light of orthogonal position phase positive association.Under identical pump power, three resonant conditions that pump light also resonates more easily reach threshold value, it is thus achieved that higher Classical Gain.
In a word, a kind of optical communicating waveband generation device for continuous variable quantum entanglement source and the method for present invention design have the advantages such as simple in construction, system stability and existing optical communication system are compatible, have important using value in practical quantum information field.
Accompanying drawing explanation
Fig. 1 is the theory diagram of the present invention a kind of optical communicating waveband generation device for continuous variable quantum entanglement source, in figure: the continuous single frequency optical fiber laser of 1-optical communicating waveband, 2-doubler, 3-flashlight pattern cleaner, 4-pump light pattern cleaner, 5-dichroic mirror, 6-fully-reflected plane mirror, 7-tri-resonates unsupervised clustering algorithm, 8-crystal temperature effect controller, 9-chamber length and phase locking system, the one 45 ° of high antiplane mirror of 10-, 11-quantum entanglement source detecting system.
Fig. 2 is the structural representation of optical communicating waveband generation device for continuous variable quantum entanglement source of the present invention, in figure: 90-the first photodetector, 91-phase modulator, 92-isolator, 93-the second photodetector, 94-frequency mixer, 95-signal generator, 96-low pass filter, 97-lock-in amplifier, 98-proportional plus integral plus derivative controller, 99-high-voltage amplifier.
Fig. 3 is the schematic diagram of three resonance unsupervised clustering algorithm of optical communicating waveband generation device for continuous variable quantum entanglement source of the present invention, in figure: the 71-adjustable mirror holder of two dimension, 72-plano-concave mirror, 73-nonlinear crystal and temperature control furnace thereof, 74-horizontal translation frame, 75-vertical translation frame, 76-precision rotation adjusting bracket, 77-invar plate.
Fig. 4 is Injection Signal optical output power situation of change in three resonance unsupervised clustering algorithm.
Fig. 5 is the Quantum Correlation noise spectrum that the present invention a kind of optical communicating waveband generation device for continuous variable quantum entanglement source obtains 1.5 μm light field quadrature amplitude sums.
Fig. 6 is the Quantum Correlation noise spectrum that the present invention a kind of optical communicating waveband generation device for continuous variable quantum entanglement source obtains 1.5 μm light field orthogonal position phase component differences.
Detailed description of the invention
Below in conjunction with the accompanying drawings the present invention is made and further illustrating:
Fig. 1 is the theory diagram of the present invention a kind of optical communicating waveband generation device for continuous variable quantum entanglement source, using output wavelength is that the optical communicating waveband continuous single frequency optical fiber laser 1 of 1.5 μm is as LASER Light Source, a laser part for laser instrument output is for pumping doubler 2, it is thus achieved that the continuous single-frequency laser of 775nm；Another part laser passes through flashlight pattern cleaner 3, filters the spatial model of laser, reduces its additional noise.The continuous single-frequency laser of 775nm passes through pump light pattern cleaner 4, filters the spatial model of laser, reduces its additional noise.Wavelength is 1.5 μm and 775nm two restraints laser by after dichroic mirror 5, all injects three resonance unsupervised clustering algorithm 7, respectively as Injection Signal light field and the pumping light field of three resonance unsupervised clustering algorithm 7.Fully-reflected plane mirror 6 with piezoelectric ceramics is for controlling the phase para-position phase of Injection Signal light field and pump light.Injection Signal light incides three resonance unsupervised clustering algorithm with 45 ° of polarization directions, and light beam resolves into two-beam o light and the e light of the identical polarized orthogonal of frequency after entering II class Temperature Matching PPKTP crystal.The temperature accurately being controlled PPKTP crystal (II class Temperature Matching periodical poled crystal) by crystal temperature effect controller 8 reaches optimum temperature matching condition, and now o light and e light resonate at optical parametric amplifier intracavity simultaneously；By the anglec of rotation of crystal is fine-tuned, changes the crystal effective optical length at three resonance unsupervised clustering algorithm 7 intracavity, thus compensate dispersion so that pump light resonates at intracavity with above-mentioned two-beam, it is achieved three resonance conditions simultaneously.Now the power density of three resonance unsupervised clustering algorithm intracavity pump light is the highest, and the threshold value of effective relatively low optical parametric oscillator obtains high Classical Gain simultaneously.By chamber length and phase locking system 9, the chamber length of three resonance unsupervised clustering algorithm is locked on the resonant frequency of Injection Signal light beam, the relative phase of Injection Signal light and pump light is locked in π, now three resonance unsupervised clustering algorithm run on anti-magnifying state, and the light field of output has amplitude anticorrelation, the quantum entanglement characteristic of position phase positive association.The Quantum Entangled States light field of output is reflected into quantum entanglement source detecting system 11 through the one 45 ° of high antiplane mirror 10, use the quantum entanglement degree of Bel's state direct detection systematic survey output light field, need not introduce background oscillation light and balance homodyne detection system, thus avoid shake and the interference visibility impact on detection of background oscillation light.
The concrete light path of optical communicating waveband generation device for continuous variable quantum entanglement source is as in figure 2 it is shown, the continuous single frequency optical fiber laser of the optical communicating waveband of 1.5 μm 1 is the 1.5 continuous single frequency optical fiber lasers of μm that output is 2W that NP Photonics company produces.Doubler 2 be two radius of curvature be that the two mirror standing-wave cavities that the plano-concave mirror of 30 mm is constituted mates periodically poled lithium niobate crystal and form with I class, shg efficiency reaches 86%, and exporting frequency doubled light wavelength is 775nm.Owing to laser and the frequency doubled light of optical fiber laser output exist the additional noise far above shot noise limit tens dB, flashlight pattern cleaner 3 and pump light pattern cleaner 4 need to be used to filter its additional noise, pattern cleaner is the three mirror annular passive resonant cavities of a length of 1.03m in chamber, and resonator cavity fineness is 500.Filtered signal light and pump light all just reach shot noise limit at analysis frequency 4MHz.Wherein the light field inciding three resonance unsupervised clustering algorithm 7 intracavity is modulated by Injection Signal light through phase modulator 91, made by isolator 92 that light path is unidirectional to be passed through, and extract the reflection light carrying resonator cavity signal, the first photodetector 90 detect this reflection light and be converted to the signal of telecommunication；This signal is mixed by frequency mixer 94 with the modulated signal of signal generator 95, after low pass filter 96 filtering, produces error signal；Error signal inputs multichannel proportional plus integral plus derivative controller 98, error signal is carried on the piezoelectric ceramics of three resonance unsupervised clustering algorithm chamber mirrors by twin-channel high-voltage amplifier 99, thus realizes the locking of optical parametric amplifier chamber length.Three resonance unsupervised clustering algorithm 7 output light fields are through the one 45 ° of high antiplane mirror 10, and the output light field power of about 1%, through the one 45 ° of high antiplane mirror 10 transmission, is detected this transmission light by the second photodetector 93 equally and is converted to the signal of telecommunication；This signal and the modulated signal mixing demodulation output error signal within lock-in amplifier 97, error signal inputs multichannel proportional plus integral plus derivative controller 98, by twin-channel high-voltage amplifier 99, error signal is carried on the piezoelectric ceramics of fully-reflected plane mirror 6, it is achieved Injection Signal light and the locking of pump light relative phase.Three resonance unsupervised clustering algorithm 7 output light fields are reflected into quantum entanglement source detecting system 11 through the one 45 ° of high antiplane mirror 10 and detect, process is as follows: the light field of output is due to polarized orthogonal, separated through polarization beam splitter prism, light beam add position phase control and by two light relative to phase locking after pi/2, synthesize through a polarization beam splitter prism again, 50/50 beam splitter that a set of half-wave plate and polarization beam splitter prism form is interfered, visibility reaches 99%, export two light beams to be detected by the photodetector of low noise high-gain, the AC signal of detector is through adder-subtractor input spectrum analyser, electric current and fluctuating are Quantum Entangled States optical field amplitude and correlated noise, difference between current rises and falls as Quantum Entangled States phase of the field difference correlated noise.Shot noise limit is given by the coherent light consistent with bright entangled power of output during only Injection Signal light situation.
The schematic diagram of three resonance unsupervised clustering algorithm 7, as it is shown on figure 3, two plano-concave mirrors 72 are both placed on two-dimentional adjustable mirror holder 71 realizing two-dimensional adjustment, constitutes resonator cavity.Nonlinear crystal is placed in the temperature control furnace of poly-phenol material making of insulation, crystal temperature effect controller 8 realize accurate temperature controlling；Horizontal translation frame 74 and vertical translation frame 75 realize the accurate regulation of crystal horizontal and vertical directions, and precision rotation adjusting bracket 76 realizes the fine adjustment of crystal angle.Whole device is fixed on the invar plate 77 that thickness is 30mm, improves the stability of system.
Fig. 4 is the change curve of the three resonance unsupervised clustering algorithm Injection Signal optical output powers that laboratory observation arrives.Can be seen that when injecting without pump light, Injection Signal optical output power does not changes when scanning Injection Signal light and pump light relative phase changes between 0 ~ π；When there being pump light, Injection Signal optical output power alternate between maximum and minimum, the most now three resonance unsupervised clustering algorithm have realized three mode resonance, and run on amplification and anti-amplification state alternately, and Classical Gain is about 40 times.
Fig. 5 is the noise power spectrum of the optical parametric amplifier output light field orthogonal amplitude sum that experiment is measured.Being at 7MHz analyzing frequency, the degree of association of light field orthogonal amplitude sum is less than shot noise limit 5.2dB, and now Electronics noice is less than shot noise limit 12dB, negligible.
Fig. 6 is the noise power spectrum of the orthogonal phase difference of optical parametric amplifier output light field that experiment is measured.Being at 7MHz analyzing frequency, the degree of association of the orthogonal phase difference of light field is less than shot noise limit 5.2dB, and now Electronics noice is less than shot noise limit 12dB, negligible.
Claims (8)
1. an optical communicating waveband generation device for continuous variable quantum entanglement source, including the continuous single frequency optical fiber laser of an optical communicating waveband (1), it is characterized in that, an emitting light path of the continuous single frequency optical fiber laser of described optical communicating waveband (1) is sequentially provided with flashlight pattern cleaner (3), dichroic mirror (5) and three resonance unsupervised clustering algorithm (7)；Another emitting light path of the continuous single frequency optical fiber laser of described optical communicating waveband (1) is provided with doubler (2), and the emitting light path of doubler (2) is sequentially provided with the fully-reflected plane mirror (6) of pump light pattern cleaner (4) and band piezoelectric ceramics；Described three resonance unsupervised clustering algorithm (7) are positioned on the transmitted light path of dichroic mirror (5)；The position relationship of dichroic mirror (5) and fully-reflected plane mirror (6) ensure that the light by doubler (2) outgoing after fully-reflected plane mirror (6) and dichroic mirror (5) reflection with the transmitted light path conllinear of dichroic mirror (5)；Described three resonance unsupervised clustering algorithm (7) include two mirror optical resonators, be positioned at two mirror optical resonance intracavity temperature and the temperature control furnace of angle and the nonlinear crystal that be placed in temperature control furnace can be fine-tuned；Described nonlinear crystal is II class Temperature Matching periodical poled crystal；Also include the reflection angle for controlling fully-reflected plane mirror (6) and the chamber length of two mirror optical resonator chamber length and phase locking system (9)；The emitting light path of three resonance unsupervised clustering algorithm (7) is provided with quantum entanglement source detecting system (11).
2. a kind of optical communicating waveband generation device for continuous variable quantum entanglement source as claimed in claim 1, it is characterized in that, described chamber length and phase locking system (9) include the first photodetector (90), phase modulator (91), isolator (92), the second photodetector (93), frequency mixer (94), signal generator (95), low pass filter (96), lock-in amplifier (97), proportional plus integral plus derivative controller (98) and high-voltage amplifier (99)；
Described phase modulator (91) and isolator (92) are sequentially positioned between flashlight pattern cleaner (3) and dichroic mirror (5), extracted the branch road of the feedback signal carrying three resonance unsupervised clustering algorithm resonator cavitys by isolator (92), described first photodetector (90) is positioned on this branch road；The signal output part of the first photodetector (90) is connected with a signal input part of frequency mixer (94), and the signal output part of signal generator (95) is connected with the signal input part of phase modulator (91) and another signal input part of frequency mixer (94) respectively；The signal output part of frequency mixer (94) is connected with a signal input part of proportional plus integral plus derivative controller (98) by low pass filter (96)；
The emitting light path of three resonance unsupervised clustering algorithm (7) is provided with the one 45 ° high antiplane mirror (10), and quantum entanglement source detecting system (11) is positioned on the reflected light path of the one 45 ° high antiplane mirror (10)；Described second photodetector (93) is positioned on the transmitted light path of the one 45 ° high antiplane mirror (10)；The signal output part of the second photodetector (93) is connected with the signal input part of lock-in amplifier (97), the signal output part of lock-in amplifier (97) is connected with another signal input part of proportional plus integral plus derivative controller (98), the signal output part of proportional plus integral plus derivative controller (98) is connected with the signal input part of high-voltage amplifier (99), and piezoelectric ceramics that two signal output parts of high-voltage amplifier (99) are joined with fully-reflected plane mirror (6) respectively and the piezoelectric ceramics that two mirror optical resonators are mated are connected.
3. a kind of optical communicating waveband generation device for continuous variable quantum entanglement source as claimed in claim 2, it is characterized in that, described flashlight pattern cleaner (3) and pump light pattern cleaner (4) are constituted by the concave mirror that two 45 ° high antiplane mirrors and radius of curvature are 1m, form three mirror annular passive resonant cavities, the a length of 1.03m in chamber, resonator cavity fineness is 500.
4. a kind of optical communicating waveband generation device for continuous variable quantum entanglement source as described in any one of claim 1 ~ 3, it is characterized in that, optical communicating waveband continuous single frequency optical fiber laser (1) shoot laser centre wavelength is 1.5 μm, described doubler (2) is made up of two mirror optical resonators and I class Temperature Matching periodical poled crystal, and the laser center wavelength of doubler (2) outgoing is 775nm.
5. a kind of optical communicating waveband generation device for continuous variable quantum entanglement source as described in any one of claim 1 ~ 3, it is characterised in that the temperature of temperature control furnace is controlled by connected crystal temperature effect controller (8).
6. a kind of optical communicating waveband generation device for continuous variable quantum entanglement source as claimed in claim 4, it is characterised in that the temperature of temperature control furnace is controlled by connected crystal temperature effect controller (8).
7. an optical communicating waveband continuous variable quantum entanglement source generating method, use device as claimed in claim 1, it is characterized in that, comprise the steps: that the continuous single frequency optical fiber laser of (a) optical communicating waveband (1) is as LASER Light Source, a laser part for output is for pumping doubler (2), it is thus achieved that the continuous single-frequency laser after frequency multiplication；Another part laser passes through flashlight pattern cleaner (3), filters the spatial model of laser, reduces its additional noise；The continuous single-frequency laser of doubler (2) outgoing passes through pump light pattern cleaner (4), filters the spatial model of laser, reduces its additional noise；B () above-mentioned two bundle laser by after dichroic mirror (5), all inject three resonance unsupervised clustering algorithm (7), respectively as Injection Signal light field and the pumping light field of three resonance unsupervised clustering algorithm (7)；Fully-reflected plane mirror (6) is for controlling the phase para-position phase of Injection Signal light field and pump light；Injection Signal light incides three resonance unsupervised clustering algorithm (7) with 45 ° of polarization directions, and this light beam resolves into two-beam o light and the e light of the identical polarized orthogonal of frequency after entering II class Temperature Matching periodical poled crystal；The temperature accurately controlling nonlinear crystal reaches optimum temperature matching condition, and now o light and e light resonate at three resonance unsupervised clustering algorithm (7) intracavity simultaneously；By the anglec of rotation of nonlinear crystal is fine-tuned, change the nonlinear crystal effective optical length at three resonance unsupervised clustering algorithm (7) intracavity, thus compensate dispersion, pump light is resonated simultaneously, it is achieved three resonance conditions at three resonance unsupervised clustering algorithm (7) intracavity with above-mentioned two-beam；C the chamber length of three resonance unsupervised clustering algorithm (7) is locked on the resonant frequency of Injection Signal light beam by () by chamber length and phase locking system (9), the relative phase of Injection Signal light and pump light is locked in π, now three resonance unsupervised clustering algorithm (7) run on anti-magnifying state, and output has amplitude anticorrelation, the Quantum Entangled States light field of position phase positive association；D Quantum Entangled States light field that () exports enters quantum entanglement source detecting system (11), uses the quantum entanglement degree of Bel'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, it is characterized in that, described optical communicating waveband continuous single frequency optical fiber laser (1) shoot laser centre wavelength is 1.5 μm, and the laser center wavelength of doubler (2) outgoing is 775nm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610382879.XA CN105867046B (en) | 2016-06-02 | 2016-06-02 | A kind of optical communicating waveband generation device for continuous variable quantum entanglement source and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610382879.XA CN105867046B (en) | 2016-06-02 | 2016-06-02 | A kind of optical communicating waveband generation device for continuous variable quantum entanglement source and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105867046A true CN105867046A (en) | 2016-08-17 |
| CN105867046B CN105867046B (en) | 2018-08-07 |
Family
ID=56676335
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610382879.XA Active CN105867046B (en) | 2016-06-02 | 2016-06-02 | A kind of optical communicating waveband generation device for continuous variable quantum entanglement source and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105867046B (en) |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106648541A (en) * | 2016-10-17 | 2017-05-10 | 山西大学 | Device and method for generating true random numbers based on twin beams |
| CN107219705A (en) * | 2017-07-21 | 2017-09-29 | 山西大学 | Signal modulation continuous variable tangles the preparation facilities in source |
| CN107300355A (en) * | 2017-07-06 | 2017-10-27 | 山西大学 | The measurement apparatus and measuring method of a kind of frequency spectrum generation device, physical quantity variation amount |
| CN108630318A (en) * | 2018-05-09 | 2018-10-09 | 上海健悦生物医学科技有限公司 | A kind of system and method for creating physical entity and being linked with pseudo-entity |
| WO2018196478A1 (en) * | 2017-04-28 | 2018-11-01 | 天津大学 | Method for controlling spectral properties of quantum-correlated photon pair using quantum interference |
| CN109596148A (en) * | 2018-12-07 | 2019-04-09 | 山西大学 | A method of improving compression light detection device interference efficiency |
| CN110187586A (en) * | 2019-05-27 | 2019-08-30 | 青岛鲲腾量子应用技术有限公司 | The thin chamber of compact monocrystal and the entangled photons source system for using the thin chamber |
| CN110716365A (en) * | 2019-11-28 | 2020-01-21 | 南京大学 | Frequency decorrelation polarization entanglement source preparation device based on reverse phase matching |
| CN111123614A (en) * | 2019-12-26 | 2020-05-08 | 太原师范学院 | Entanglement enhancing device for four-component bound entanglement source and implementation method |
| CN112051696A (en) * | 2020-08-21 | 2020-12-08 | 山西大学 | Miniaturized compression source generating device |
| CN113189566A (en) * | 2021-04-29 | 2021-07-30 | 深圳市京湾量子遥感科技有限公司 | Quantum laser radar system based on quantum light field and control method thereof |
| CN116112094A (en) * | 2023-02-20 | 2023-05-12 | 山西大学 | Device for preparing continuous variable entanglement network |
| CN116793330A (en) * | 2023-08-25 | 2023-09-22 | 山西大学 | Quantum enhanced fiber optic gyroscope based on continuous variable quantum entanglement source and method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110032532A1 (en) * | 2007-08-18 | 2011-02-10 | Takuya Hirano | Quantum entanglement generating system and method, and quantum entanglement generating and detecting system and method |
| CN103149773A (en) * | 2013-03-14 | 2013-06-12 | 山西大学 | Device and method for automatically adjusting classical gain in continuous variable quantum entanglement source |
| CN103176329A (en) * | 2013-04-11 | 2013-06-26 | 山西大学 | Continuous variable quantum entanglement source generating device |
| CN104752944A (en) * | 2015-04-07 | 2015-07-01 | 中国科学技术大学 | Narrow-line-width high-dimensionality quantum entanglement light source generating device |
| CN105428967A (en) * | 2015-12-23 | 2016-03-23 | 山西大学 | High-precision temperature locking apparatus and locking method for entangled source |
-
2016
- 2016-06-02 CN CN201610382879.XA patent/CN105867046B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110032532A1 (en) * | 2007-08-18 | 2011-02-10 | Takuya Hirano | Quantum entanglement generating system and method, and quantum entanglement generating and detecting system and method |
| CN103149773A (en) * | 2013-03-14 | 2013-06-12 | 山西大学 | Device and method for automatically adjusting classical gain in continuous variable quantum entanglement source |
| CN103176329A (en) * | 2013-04-11 | 2013-06-26 | 山西大学 | Continuous variable quantum entanglement source generating device |
| CN104752944A (en) * | 2015-04-07 | 2015-07-01 | 中国科学技术大学 | Narrow-line-width high-dimensionality quantum entanglement light source generating device |
| CN105428967A (en) * | 2015-12-23 | 2016-03-23 | 山西大学 | High-precision temperature locking apparatus and locking method for entangled source |
Non-Patent Citations (3)
| Title |
|---|
| TOBIAS EBERLE等: "Stable control of 10 dB two-mode squeezed vacuum states of light", 《OPTICS EXPRESS》 * |
| 张敏: "利用楔角KTP晶体实现低阈值NOPA腔运转", 《中国优秀硕士学位论文全文数据库基础科学辑》 * |
| 马亚云等: "利用PPKTP晶体半整块光学参量放大器产生1.5μm光通信波段明亮正交振幅压缩光", 《量子光学学报》 * |
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106648541B (en) * | 2016-10-17 | 2019-05-17 | 山西大学 | A kind of device and method generating true random number based on twin light beam |
| CN106648541A (en) * | 2016-10-17 | 2017-05-10 | 山西大学 | Device and method for generating true random numbers based on twin beams |
| US10824046B2 (en) | 2017-04-28 | 2020-11-03 | Tianjin University | Method for controlling spectral properties of optical quantum states using quantum interference in cascaded waveguide structure |
| WO2018196478A1 (en) * | 2017-04-28 | 2018-11-01 | 天津大学 | Method for controlling spectral properties of quantum-correlated photon pair using quantum interference |
| CN107300355A (en) * | 2017-07-06 | 2017-10-27 | 山西大学 | The measurement apparatus and measuring method of a kind of frequency spectrum generation device, physical quantity variation amount |
| CN107219705A (en) * | 2017-07-21 | 2017-09-29 | 山西大学 | Signal modulation continuous variable tangles the preparation facilities in source |
| CN107219705B (en) * | 2017-07-21 | 2019-07-23 | 山西大学 | Signal modulation continuous variable tangles the preparation facilities in source |
| CN108630318A (en) * | 2018-05-09 | 2018-10-09 | 上海健悦生物医学科技有限公司 | A kind of system and method for creating physical entity and being linked with pseudo-entity |
| CN109596148A (en) * | 2018-12-07 | 2019-04-09 | 山西大学 | A method of improving compression light detection device interference efficiency |
| CN110187586A (en) * | 2019-05-27 | 2019-08-30 | 青岛鲲腾量子应用技术有限公司 | The thin chamber of compact monocrystal and the entangled photons source system for using the thin chamber |
| CN110716365A (en) * | 2019-11-28 | 2020-01-21 | 南京大学 | Frequency decorrelation polarization entanglement source preparation device based on reverse phase matching |
| CN111123614A (en) * | 2019-12-26 | 2020-05-08 | 太原师范学院 | Entanglement enhancing device for four-component bound entanglement source and implementation method |
| CN112051696A (en) * | 2020-08-21 | 2020-12-08 | 山西大学 | Miniaturized compression source generating device |
| CN112051696B (en) * | 2020-08-21 | 2021-09-28 | 山西大学 | Miniaturized compression source generating device |
| CN113189566A (en) * | 2021-04-29 | 2021-07-30 | 深圳市京湾量子遥感科技有限公司 | Quantum laser radar system based on quantum light field and control method thereof |
| CN113189566B (en) * | 2021-04-29 | 2024-05-24 | 毕思文 | Quantum laser radar system based on quantum light field and control method thereof |
| CN116112094A (en) * | 2023-02-20 | 2023-05-12 | 山西大学 | Device for preparing continuous variable entanglement network |
| CN116793330A (en) * | 2023-08-25 | 2023-09-22 | 山西大学 | Quantum enhanced fiber optic gyroscope based on continuous variable quantum entanglement source and method |
| CN116793330B (en) * | 2023-08-25 | 2023-11-14 | 山西大学 | Quantum enhanced fiber optic gyroscope based on continuous variable quantum entanglement source and method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105867046B (en) | 2018-08-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105867046A (en) | Device and method for generating photo-communication waveband continuous variable quantum entanglement source | |
| CN103901700B (en) | Wavelength tunable and frequency spectrum controllable small-sized Quantum Correlation photon pair source and the method for generation | |
| CN107300355B (en) | A kind of measuring device and measuring method of frequency spectrum generation device, physical quantity variation amount | |
| CN205787512U (en) | A kind of optical communicating waveband generation device for continuous variable quantum entanglement source | |
| CN109656078A (en) | A kind of Energy-Time tangles two-photon production method | |
| CN113126385B (en) | Device for generating high-order orbital angular momentum entangled state of two-component continuous variable | |
| Yum et al. | Demonstration of white light cavity effect using stimulated Brillouin scattering in a fiber loop | |
| CN102354074A (en) | Two-tone tunable continuous variable entanglement state generation and detection device | |
| CN111474802B (en) | Device for simultaneously generating compressed-state light field and entangled-state light field | |
| CN106025779A (en) | Astronomical optical frequency comb system based on harmonic mode-locked fiber laser device | |
| CN107561819A (en) | A kind of squeezed vacuum state light field generating means and method | |
| CN104092088A (en) | Device for simultaneously reducing intensity noise and frequency noise of single frequency laser and working method thereof | |
| CN103078241B (en) | All-optical-fiber laser noise filtering device | |
| CN112038881A (en) | Pump optical cavity enhanced double-resonance optical parametric oscillator and efficient conversion method | |
| CN102520516B (en) | Locking device of micro-optical cavity with high fineness and locking method thereof | |
| CN106785812A (en) | Optical-electronic oscillator and adjusting method based on stimulated Brillouin scattering enlarge-effect | |
| Guo et al. | Influence of the pump scheme on the output power and the intensity noise of a single-frequency continuous-wave laser | |
| CN101958505B (en) | Frequency locking device for dual wavelength external cavity resonance system | |
| Leng et al. | Scheme to generate continuous-variable quadripartite entanglement by intracavity down-conversion cascaded with double sum-frequency generations | |
| CN110297376A (en) | A kind of stable generation device for continuous variable quantum entanglement source | |
| Guan et al. | Numerical Investigation of on-Chip Multi-Gas Sensing Using a Low-Repetition-Frequency Microcavity Kerr Comb With Backward Interference Structure | |
| JP6580554B2 (en) | Generator for at least three coherent laser beams in the infrared and visible regions | |
| Omi et al. | Independently programmable frequency-multiplexed phase-sensitive optical parametric amplification in the optical telecommunication band | |
| CN105428967A (en) | High-precision temperature locking apparatus and locking method for entangled source | |
| Conti et al. | Low-amplitude-noise laser for AURIGA detector optical readout |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20221129 Address after: Room 1341, Hongxu Sheng Zhongchuang Space, 13th and 14th Floor, Central Golden Tower, No. 418, South Zhonghuan Street, Xuefu Industrial Park, Taiyuan City, Shanxi Province, 030006 Patentee after: Shanxi Ai Ruishen Technology Co.,Ltd. Address before: 030006 No. 92, Hollywood Road, Taiyuan, Shanxi Patentee before: SHANXI University |