CN108462026A - A kind of auto-collimation high stable tangles source module and system - Google Patents
A kind of auto-collimation high stable tangles source module and system Download PDFInfo
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- CN108462026A CN108462026A CN201810306394.1A CN201810306394A CN108462026A CN 108462026 A CN108462026 A CN 108462026A CN 201810306394 A CN201810306394 A CN 201810306394A CN 108462026 A CN108462026 A CN 108462026A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/094049—Guiding of the pump light
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/10007—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers
- H01S3/10023—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers by functional association of additional optical elements, e.g. filters, gratings, reflectors
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- H—ELECTRICITY
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/10061—Polarization control
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
- H01S3/108—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering
- H01S3/1083—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering using parametric generation
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
- H01S3/108—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering
- H01S3/109—Frequency multiplication, e.g. harmonic generation
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Abstract
The invention discloses a kind of auto-collimation high stables to tangle source module and system, double-colored polarization beam apparatus DPBS, double-colored half-wave plate DHWP, the first plane mirror M1, the second concave mirror CM2, the first concave mirror CM1, the second plane mirror M2 including setting gradually and being formed optical loop are provided with periodic polarized crystal in the light path between the first concave mirror CM1 and the second concave mirror CM2.The advantages of invention, is：The collimation of converted photons under the Spontaneous Parametric generated may be implemented by the way that the focusing of pump beam not only may be implemented with the first concave mirror and the second concave mirror.The condenser lens and the required optical fiber collimator of photon collection of pump light are can be omitted, the complexity of light path is greatly simplified, while tangling source module can highly integrated and miniaturization.
Description
Technical field
The present invention relates to laser technology, nonlinear optical physical technique, quantum optices and Technique on Quantum Communication fields, especially
A kind of auto-collimation high stable tangles source module and system.
Background technology
Remote quantum communications are mainly based upon fibre system and free space, and the low loss window of fibre system exists
1550nm wave bands, therefore to realize that the remote quantum teleportation of optical fiber system and quantum entanglement exchange, it needs to prepare highlighted
Spend high quality, the quantum entangled source system of Highgrade integration.It is used at present to be in star in quantum communication systems used for free space
Visible light tangles source, however visible light tangles source and influenced by sunlight very big, daytime and can not have the night operation of moonlight again,
Therefore the entangled photon pairs of infrared communication wave band are needed to realize round-the-clock satellite-ground quantum communication system.In addition, detection at present
The best single-photon detector of performance is superconductor detector, the best effort wave band of superconductor detector in infrared communication wave band, because
This has the progress researchs such as quantum communications, quantum calculation and simulation and quantum accurate measurement using communication band photon can not
The advantage of analogy.
In consideration of it, it is necessary to study it is a kind of it is small, brightness is high, it is high-quality to tangle, big infrared of spectrum tunable range
The entangled light source module of communication band provides necessary support for quantum information technology correlative study.
Invention content
In order to overcome the above-mentioned prior art, for this purpose, a kind of auto-collimation high stable of present invention offer tangles source module and system.
To achieve the above object, the present invention uses following technical scheme：
A kind of auto-collimation high stable tangles source module, including sets gradually and formed the double-colored polarization beam apparatus of optical loop
DPBS, double-colored half-wave plate DHWP, the first plane mirror M1, the second concave mirror CM2, the first concave mirror CM1, the second plane
Mirror M2 is provided with periodic polarized crystal in the light path between the first concave mirror CM1 and the second concave mirror CM2.
Further, the radius of curvature of the first concave mirror CM1 and the second concave mirror CM2 are identical, described
Optical path distance l between first concave mirror CM1 and the second concave mirror CM22Meet formulaFormula
Middle n is the refractive index of periodic polarized crystal, LcFor the length of periodic polarized crystal, r is the first concave mirror CM1 and the
The radius of curvature of two concave mirror CM2.
Further, temperature controlling stove is provided with outside the periodic polarized crystal, the temperature-control range is 15 to 70 degrees Celsius,
Temperature-controlled precision 2mK.
Further, the beam incident angle of the first concave mirror CM1 and the second concave mirror CM2 8 degree with
It is interior.
Further, the periodic polarized crystal is PPKTP crystal.
A kind of system for tangling source module including above-mentioned auto-collimation high stable, further includes laser L, the light set gradually
Learn isolator OC, light intensity regulating unit, phase adjustment unit, dichroic mirror DM, the dichroic mirror DM outputs be divided into the first light path and
Second light path, the first light path are input in double-colored polarization beam apparatus in DPBS, after the output end of double-colored polarization beam apparatus DPBS according to
It is secondary to be provided with the second analyzer P2, the second long pass filter piece LP2, the second optical fiber collimator FC2；
Second light path sets gradually third plane mirror M3, the first analyzer P1, the first long pass filter piece LPF1, the first optical fiber
Collimator FC1；
The output end of the first optical fiber collimator FC1 and the second optical fiber collimator FC2 respectively with meet computing module connect
It connects.
Further, the optical path distance a and the first plane mirror of the double-colored polarization beam apparatus DPBS to the first plane mirror M1
The sum of M1 to the optical path distance b of the second concave mirror CM2 is equal to the light of double-colored polarization beam apparatus DPBS to the second plane mirror M2
Road distance a ' and the second plane mirror M2 to the sum of the optical path distance b ' of the first concave mirror CM1 l2, first fiber optic collimator
Optical path distance between device FC1 and the second optical fiber collimator FC2 and concave mirror is l3, l3=l2+ C, C are double-colored polarization beam apparatus
DPBS respectively with the distance between the first optical fiber collimator FC1 and the second optical fiber collimator FC2.
Further, the light intensity regulating unit in the light path direction of the launch include set gradually the first half-wave plate HWP1,
Polarization beam apparatus PBS.
Further, the phase adjustment unit includes the quarter-wave plate set gradually in the light path direction of the launch
QWP, the second half-wave plate HWP2.
Further, the first analyzer P1 and the angle of horizontal direction are 45 degree or -45 degree, second analyzer
P2 is vertically arranged with the first polarizer P1.
The advantage of the invention is that：
(1) focusing of the invention by the way that pump beam both may be implemented with the first concave mirror and the second concave mirror
The collimation of converted photons under the Spontaneous Parametric generated may be implemented again.The condenser lens and photon that can be omitted pump light are received
Collect required optical fiber collimator, greatly simplifies the complexity of light path, while tangling source module can be highly integrated and small-sized
Change.
(2) since the frequency-doubled wavelength of periodic polarized crystal has a certain range of tunable characteristic, when pumping wave long hair
When changing, changing the phase-matching temperatures of periodic polarized crystal by temperature controlling stove can realize most preferably under new wavelength
Frequency multiplication exports.
The setting of (3) first plane mirror M1 and the second plane mirror M2 make the first concave mirror CM1 and the second concave surface anti-
The beam incident angle of mirror CM2 is penetrated within 8 degree, can ensure higher optical quality and photon collection efficiency in this way.
(4) pump light of semiconductor laser L outgoing contains two type phases by being input to one after optical isolator OC
Matching PPKTP crystal tangles in source module, due to transfer process under Spontaneous Parametric, in the clockwise and inverse time for tangling source module
Needle direction generates the photon pair of a pair of of polarized orthogonal simultaneously, and these two pair photon is formed after being interfered on double-colored polarization beam apparatus
Polarization-entangled state, the optical path that the forward and reverse by tangling source module is undergone is consistent, space and phase stability pole
Height can keep the phase stability of Entangled State for a long time.In addition, light of the quasi-phase matched PPKTP crystal in communication band
Spectrum tuning range is wide, and by tuning the temperature and pumping wavelength of periodic polarized crystal, the letter in hundred nanometer ranges may be implemented
And photon exports.
(5) PPKTP crystal nonlinear factor is high, no walk-off effect, and the photon of generation is high to spectrum brightness.
(6) setting of optical isolator OC is in order to eliminate influence of the back-reflection light to laser L performances, light intensity regulating list
Member is input to the luminous power of subordinate's light path by the first half-wave plate HWP1 controls, for controlling photon generation rate, while polarizing and dividing
Beam device PBS has the function of polarization filtering, for purifying polarization of pumping beams.
(7) phase adjustment unit is used to adjust the phase of the polarization-entangled state generated, by adjusting quarter-wave plate QWP
With the rotational angle of the second half-wave plate HWP2, rotational angle quarter-wave plate QWP and the second half-wave plate HWP2 are equivalent to wave plate
Fast and slow axis, pump light can be allowed to be in polarization stateH indicates that horizontal polarization state, V indicate to hang down in formula
Straight polarization state,For the relative phase between pump light horizontal polarization and vertical polarization, i is imaginary unit.It is entangled by adjusting
Twine statePhase0 or π is made it equal to, to obtain maximum Bell Entangled States, phaseAccording to
Rely the phase in pump lightAnd this ancient phase caused by being deviateed due to periodic polarized crystal positionRelative phaseDependent on the position of quarter-wave plate QWP and the second half-wave plate HWP2, in addition when periodic polarized crystal is relative to tangling
When there is deviation at the center of source module, the pump light of forward and reverse is during parametric down conversion, this entrained ancient phase
Can be different, it can also realize phase by finely tuning position of the periodic polarized crystal in tangling source moduleAccurate adjusting.
Maximum Entangled State in order to obtain, willThe criterion for being adjusted to 0 or π is to be placed on the first analyzer P1 to be located at and horizontal direction
At 45 and -45 degree positions, the second analyzer P2 is vertically arranged with the first analyzer P1, in this way if phaseIt is 0, then polarizes
Interference curve arrives minimum point, phase in minimum point, as long as interference is adjustedValue just returned to zero；If it is desired to allowing phaseDeng
In π, one of analyzer is turn 90 degrees again, minimum is transferred in interference, so that it may to realizeEqual to π.
Description of the drawings
Fig. 1 is the structural schematic diagram that a kind of auto-collimation high stable of the present invention tangles source module；
Fig. 2 is the structural schematic diagram that a kind of auto-collimation high stable of the present invention tangles source system；
Fig. 3 is the thermal tuning curve for the selected crystal that a kind of auto-collimation high stable of the present invention tangles source system.
Fig. 4 is the HOM interference curves between photon in the embodiment of the present invention.
Fig. 5 is the polarization interference curve of entangled photons in the embodiment of the present invention.
The meaning of label symbol is as follows in figure：
1- meets computing module 2- temperature controlling stoves
Specific implementation mode
As shown in Figure 1, a kind of auto-collimation high stable tangles source module, including set gradually and formed the 780nm of optical loop
With the double-colored half-wave plate DHWP of double-colored polarization beam apparatus DPBS, 780nm and 1560nm, first plane mirror M1,780nm of 1560nm and
The first concave mirror CM1, the second plane mirror that second concave mirror CM2,780nm and 1560nm that 1560nm is all-trans is all-trans
M2 is provided with periodic polarized crystal in the light path between the first concave mirror CM1 and the second concave mirror CM2, described
Periodic polarized crystal is PPKTP crystal.The wherein radius of curvature of the first concave mirror CM1 and the second concave mirror CM2
For 150nm.
Temperature controlling stove 2 is provided with outside the periodic polarized crystal, the temperature-control range is 15 to 70 degrees Celsius, temperature-controlled precision
2mK。
Double-colored polarization beam apparatus DPBS is used to pump light being divided into the loop direction of two horizontal polarizations and vertical polarization,
The light path cycle of middle horizontal polarization is double-colored polarization beam apparatus DPBS, double-colored half-wave plate DHWP, the first plane mirror M1, the second concave surface
Speculum CM2, PPKTP crystal, the first concave mirror CM1, the second plane mirror M2, double-colored polarization beam apparatus DPBS, it is vertical inclined
The light path cycle shaken is double-colored polarization beam apparatus DPBS, the second plane mirror M2, first concave mirror CM1, PPKTP crystal, the
Two concave mirror CM2, the first plane mirror M1, double-colored half-wave plate DHWP, double-colored polarization beam apparatus DPBS.The pumping of horizontal polarization
Light generates polarization state by PPKTP crystal | H>|V>Polarized orthogonal photon, then become by double-colored half-wave plate DHWP | V>|H
>Photon state, the pump light of vertical polarization first passes through double-colored half-wave plate DHWP and becomes horizontal polarization light, and then parametric down conversion produces
It is raw | H>|V>Photon pair, the pump lights of two loop directions is finally superimposed on double-colored polarization beam apparatus DPBS and formed againRelative phase can be by the phase of adjusting pump light, or passes through moving period's property polarization crystalline substance
Position of the body in interference ring is adjusted.
The beam incident angle of the first concave mirror CM1 and the second concave mirror CM2 are within 8 degree.
Further include the 780nm set gradually as shown in Fig. 2, including the system that above-mentioned auto-collimation high stable tangles source module
Laser L, 780nm optical isolator OC, light intensity regulating unit, phase adjustment unit, dichroic mirror DM, the dichroic mirror DM outputs
It is divided into two-way, is input to all the way in double-colored polarization beam apparatus in DPBS, another lens combination light path output of double-colored polarization beam apparatus DPBS
After be disposed with the second analyzer P2, the second long pass filter piece LP2, the second optical fiber collimator FC2；Another way sets gradually
Three plane mirror M3, the first analyzer P1, the first long pass filter piece LPF1, the first optical fiber collimator FC1；First fiber optic collimator
The output end of device FC1 and the second optical fiber collimator FC2 by single mode optical fiber respectively with meet computing module 1 and connect.Wherein optics
Isolator OC is for eliminating influence of the back-reflection light to laser L performances.
Light intensity regulating unit includes setting gradually 780nm the first half-wave plate HWP1,780nm polarization beam splittings in this embodiment
Device PBS.Phase adjustment unit includes the second half-wave plate HWP2 of 780nm quarter-wave plates QWP, 780nm set gradually.
How with compact highly integrated light path to realize high brightness, high tangles quality and a wide range of tunable infrared communication
The preparation of wave band polarized photon pair is as follows：
(1) it first has to the design completed and determines that auto-collimation high stable tangles the geometric dimension of source module and periodic polarized crystalline substance
The relationship of body length and the first concave mirror CM1 and the second concave mirror CM2 curvature.
The optical path distance a and the first plane mirror M1 of the double-colored polarization beam apparatus DPBS to the first plane mirror M1 is recessed to second
The sum of optical path distance b of face speculum CM2 equal to double-colored polarization beam apparatus DPBS to the second plane mirror M2 optical path distance a ' with
The sum of the optical path distance b ' of second plane mirror M2 to the first concave mirror CM1, and define and be l1, fiber optic collimator and concave mirror
Between optical path distance be l3, the l3=l2+ C, C are the distance between double-colored polarization beam apparatus and optical fiber collimator, the first concave surface
Optical path distance between speculum CM1 and the second concave mirror CM2 is l2。
Obtaining propogator matrix of the pump light in periodic polarized crystal center from Exit positions to pump light is：
N is the refractive index of periodic polarized crystal, L in formulacFor the length of periodic polarized crystal, first concave surface is anti-
The radius of curvature for penetrating mirror CM1 and the second concave mirror CM2 is identical, and r is the first concave mirror CM1 and the second concave mirror
The radius of curvature of CM2, A1、B1、C1、D1For the various element in propogator matrix.
Assuming that laser L outputs are the Gaussian beam of collimation, waist radius w0, then at periodic polarized crystal center
Size with a tight waist can use Propagation of Gaussian Beam A1B1C1D1Matrix obtains, in the height for tangling source module and inputting the position of laser
This laser parameter isSo in the gauss laser parameter q of germ nucleus position1It can be expressed as
I is imaginary unit in formula, and λ is pumping wavelength, Z0For Ruili distance；
Gaussian beam after transformation is located at radius of curvature when tangling source module center and waist radius respectively can be with
It is expressed as
When germ nucleus position is the beam waist position of the Gaussian beam after focusing, 1/R1=0, it in this way can be with the first concave surface
Waist radius w between speculum CM1 and the second concave mirror CM21Size and the first concave mirror CM1 and second are recessed
Optical path distance l between the speculum CM2 of face2.Acquired results are
W wherein with a tight waist1The collection efficiency that photon can be optimized when coincidence formula (4), improves the brightness in source.
Under these conditions, Gaussian Beam Transformation is further calculated to the first optical fiber collimator FC1 and the second fiber optic collimator
Matrix at device FC2, can obtain the parameter matrix before the first optical fiber collimator FC1 and the second optical fiber collimator FC2 is
Wherein l2≈ r, A2、B2、C2、D2For the various element in parameter matrix, the square provided herein by formula (5) under approximation
Battle array parameter can obtain the radius of curvature of the output end Gaussian beam of the first optical fiber collimator FC1 and the second optical fiber collimator FC2
And waist radius, it is expressed as,
For the Gaussian beam that a spot diameter is 2mm, Z0＞ ＞ r, l1,l3, therefore w ≈ w0,R2≈∞.So passing through
The focusing of pump beam not only may be implemented with the first concave mirror CM1 and the second concave mirror CM2 but also may be implemented to generate
Spontaneous Parametric under converted photons collimation.It can be omitted the condenser lens and the required collimation of photon collection of pump light
Lens, greatly simplify the complexity of light path, while tangling source module can highly integrated and miniaturization.First concave mirror
CM1 and the second concave mirror CM2 focusing need the angle of very little just to can guarantee that the astigmatism of focus on light beam is smaller, do not influence light beam
Optical quality after collimation is made to realize smaller angle of entering an association by introducing the first plane mirror M1 and the second plane mirror M2
The beam incident angle of first concave mirror CM1 and the second concave mirror CM2 can ensure higher in this way within 8 degree
Optical quality and photon collection efficiency.
(2) degree of entanglement in source of tangling, the phase adjusted of spectral tuning characteristic and Entangled State are characterized.The following institute of detailed step
Show.
(21) Entangled State is adjustedPhase0 or π is made it equal to, it is maximum to obtain
Bell Entangled States.
PhasePhase dependent on pump lightAnd due to periodic polarized crystal position deviate caused by Gu according to
PhaseBy adjusting quarter-wave plate QWP and the second half-wave plate HWP2, pump light is allowed to be in polarization stateRelative phaseDependent on the position of quarter-wave plate QWP and the second half-wave plate HWP2, in addition
When PPKTP crystal phases have deviation for the center for tangling source module, the pump light of forward and reverse is in parametric down conversion process
In, this entrained ancient phaseCan be different, it can also be realized by finely tuning position of the PPKTP crystal in tangling source module
PhaseAccurate adjusting.Maximum Entangled State in order to obtain, willThe criterion for being adjusted to 0 or π is to put the first analyzer P1
Positioned at, at 45 and -45 degree positions, the second analyzer P2 is vertically arranged with the first analyzer P1 with horizontal direction, in this way if
PhaseIt is 0, then polarization interference curve arrives minimum point, phase in minimum point as long as interference is adjustedValue just returned to zero；Such as
Fruit wants to allow phaseEqual to π, one of analyzer is turn 90 degrees again, minimum is transferred in interference, so that it may to realizeEqual to π.
(22) temperature of adjusting PPKTP crystal and pumping wavelength come real to reach quasi-phase matched as spectral tuning
Existing frequencies into degeneration entangled photons output.
Degeneracy photon output temperature under different pumping wavelengths in order to obtain, usually there are two types of modes, and one is pass through
The inverse process of parametric down conversion, two type quasi-phase matched frequencys multiplication measure the frequency multiplication temperature curve under different pumping wavelengths, to
Determine that the phase-matching temperatures under different wave length, another way are interfered by the HOM in quantum optices to detect radiation
Photon wavelength whether degeneracy, if wavelength degeneracy can obtain the very high HOM point paddy of interference visibility, if degeneracy can not seen wavelength
Photon beat frequency is observed, or can't see interference completely.Fig. 3 is the matching temperature determined using frequency-doubling method under different wave length, with
And the HOM interference curves observed at a temperature of the matching in Fig. 4.By measure different wave length under matching temperature it was found that
Two type PPKTP crystal have very excellent tuning characteristic in communication band, and spectrum tunable range is in 100nm or more.
In present example, for following ginseng that the quality of entangled light source caused by characterizing needs to measure source of tangling
Number.Firstly the need of the relationship for measuring photon generation rate and pump power, as shown in figure 5, photon generation rate in this example can
To reach 3 × 104/mW.Then under suitable power, it would be desirable to characterize the Entanglement of entangled photons, Entanglement is logical
Measurement polarization interference curve is crossed to portray, the interference visibility under orthogonal basis and diagonal base is respectively 98.53% He
96.60%, in addition to this, we also prove that the state prepared has Bell non-localities by measuring Bell inequality, measure
The S value sizes of the Bell inequality of acquisition are 2.727.
Finally, it would be desirable to which characterization tangles the wavelength tuning characteristic in source, changes the wavelength of pump light, and adjust temperature and arrive
Under corresponding phase-matching temperatures, change situation of the interference visibility with wavelength is measured, measurement result shows that the source of tangling exists
Within the scope of the wavelength regulation of tens nanometers, interference visibility is still very high.
The preferred embodiment that these are only the invention is not intended to limit the invention creation, all in the present invention
All any modification, equivalent and improvement etc., should be included in the guarantor of the invention made by within the spirit and principle of creation
Within the scope of shield.
Claims (10)
1. a kind of auto-collimation high stable tangles source module, which is characterized in that including setting gradually and being formed the double-colored inclined of optical loop
Shake beam splitter DPBS, double-colored half-wave plate DHWP, the first plane mirror M1, the second concave mirror CM2, the first concave mirror CM1,
Second plane mirror M2 is provided between the first concave mirror CM1 and the second concave mirror CM2 in light path periodic polarized
Crystal.
2. a kind of auto-collimation high stable according to claim 1 tangles source module, which is characterized in that first concave surface is anti-
The radius of curvature for penetrating mirror CM1 and the second concave mirror CM2 is identical, the first concave mirror CM1 and the second concave reflection
Optical path distance l between mirror CM22Meet formulaN is the refractive index of periodic polarized crystal, L in formulacFor
The length of periodic polarized crystal, r are the radius of curvature of the first concave mirror CM1 and the second concave mirror CM2.
3. a kind of auto-collimation high stable according to claim 1 tangles source module, which is characterized in that described periodic polarized
Temperature controlling stove (2) is provided with outside crystal, the temperature-control range is 15 to 70 degrees Celsius, temperature-controlled precision 2mK.
4. a kind of auto-collimation high stable according to claim 1 tangles source module, which is characterized in that first concave surface is anti-
The beam incident angle of mirror CM1 and the second concave mirror CM2 is penetrated within 8 degree.
5. a kind of auto-collimation high stable according to claim 1 tangles source module, which is characterized in that described periodic polarized
Crystal is PPKTP crystal.
What 6. a kind of auto-collimation high stable including described in claim 1-5 any one tangled source module tangles source system,
It is characterized in that, including laser L, optical isolator OC, light intensity regulating unit, phase adjustment unit, the dichroic mirror set gradually
DM, the dichroic mirror DM outputs are divided into the first light path and the second light path, and the first light path road is input in double-colored polarization beam apparatus
In DPBS, be disposed with after the output end of double-colored polarization beam apparatus DPBS the second analyzer P2, the second long pass filter piece LP2,
Second optical fiber collimator FC2；
Second light path sets gradually third plane mirror M3, the first analyzer P1, the first long pass filter piece LPF1, the first fiber optic collimator
Device FC1；
The output end of the first optical fiber collimator FC1 and the second optical fiber collimator FC2 respectively with meet computing module (1) even
It connects.
7. according to claim 6 tangle source system, which is characterized in that the double-colored polarization beam apparatus DPBS is flat to first
The sum of optical path distance a of face mirror M1 and the first plane mirror M1 to the optical path distance b of the second concave mirror CM2 is equal to double-colored polarization
The light path of the optical path distance a ' and the second plane mirror M2 to the first concave mirror CM1 of beam splitter DPBS to the second plane mirror M2 away from
From the sum of b ' l2, the optical path distance between the first optical fiber collimator FC1 and the second optical fiber collimator FC2 and concave mirror is l3,
l3=l2+ C, C are double-colored polarization beam apparatus DPBS respectively between the first optical fiber collimator FC1 and the second optical fiber collimator FC2
Distance.
8. according to claim 6 tangle source system, which is characterized in that the light intensity regulating unit is in the light path direction of the launch
Upper includes setting gradually the first half-wave plate HWP1, polarization beam apparatus PBS.
9. according to claim 6 tangle source system, which is characterized in that the phase adjustment unit is in the light path direction of the launch
Upper includes quarter-wave plate QWP, the second half-wave plate HWP2 set gradually.
10. according to claim 6 tangle source system, which is characterized in that the first analyzer P1 and horizontal direction
Angle is 45 degree or -45 degree, the second analyzer P2 are vertically arranged with the first polarizer P1.
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