CN108388035A - It is prepared entirely with the device and method of two-photon based on single atom assemblage - Google Patents
It is prepared entirely with the device and method of two-photon based on single atom assemblage Download PDFInfo
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- CN108388035A CN108388035A CN201810375665.9A CN201810375665A CN108388035A CN 108388035 A CN108388035 A CN 108388035A CN 201810375665 A CN201810375665 A CN 201810375665A CN 108388035 A CN108388035 A CN 108388035A
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 230000010287 polarization Effects 0.000 claims abstract description 105
- 229910052701 rubidium Inorganic materials 0.000 claims abstract description 63
- IGLNJRXAVVLDKE-UHFFFAOYSA-N rubidium atom Chemical group [Rb] IGLNJRXAVVLDKE-UHFFFAOYSA-N 0.000 claims abstract description 63
- 230000007704 transition Effects 0.000 claims abstract description 61
- 230000008569 process Effects 0.000 claims description 11
- 230000008859 change Effects 0.000 claims description 9
- 239000013307 optical fiber Substances 0.000 claims description 7
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- 238000012545 processing Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 16
- 238000005259 measurement Methods 0.000 description 7
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- 238000004364 calculation method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
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- 238000005086 pumping Methods 0.000 description 1
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- 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
- G02F1/01—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 for the control of the intensity, phase, polarisation or colour
- G02F1/11—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 for the control of the intensity, phase, polarisation or colour based on acousto-optical elements, e.g. using variable diffraction by sound or like mechanical waves
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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
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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
- H01S3/10061—Polarization control
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Abstract
A kind of to be prepared entirely with the device and method of two-photon based on single atom assemblage, which includes：Adjustment module is polarized, the frequency of first laser is changed so that the first mismatching angle of first laser and rubidium atom is Δ1, determine the first polarised light；Rubidium atom assemblage, is excited by the first polarised light so that the rubidium atomic transition of the first energy level to third energy level generates the first transition light；Polarization module determines the first signal light；Polarize time delay module so that the second mismatching angle of second laser and rubidium atom is Δ2, determine the second polarised light；And second polarised light excite single rubidium atom assemblage so that the rubidium atomic transition of the second energy level to third energy level generates the second transition light；Tuning module is polarized, determines second signal light；First mismatching angle Δ1With the second mismatching angle Δ2Meet Δ1‑Δ2=ω12, ω12It is the difference on the frequency of the first energy level and the second energy level, the first signal light is complete same two-photon with second signal light.
Description
Technical field
The present invention relates to quantum mechanics field more particularly to it is a kind of based on single atom assemblage prepare entirely with the dress of two-photon
It sets and method.
Background technology
With the fast development of quantum information science, multi-photon Entangled State as in quantum mechanics it is a kind of it is very special,
And attractive quantum state slowly attracts the sight of people.It is each in quantum communications, quantum calculation and quantum metering etc.
Vital effect is all played in the application of kind quantum information.In quantum calculation field, multi-photon Entangled State can provide
The abundant Quantum Computing based on multi-photon；In quantum metrology, multiparticle Entangled State can overcome in the measurements by
The low precision caused by inevitable statistical error, and then the precision of quantum accurate measurement can be improved.
Currently, the prior art prepares multiple photons pair using multiple atom assemblages mostly, then to any two of which
So just there is complicated for operation, the cumbersome problem of structure to carrying out Bell state measurement in photon.
Invention content
(1) technical problems to be solved
It is prepared entirely with the device and method of two-photon based on single atom assemblage the purpose of the present invention is to provide a kind of, with
Solve at least one above-mentioned technical problem.
(2) technical solution
An aspect of of the present present invention, provide it is a kind of based on single atom assemblage prepare entirely with the device of two-photon, including：
Polarize adjustment module, for first laser carry out polarization manipulation, change first laser polarization direction and change
Become the frequency of the first laser so that the first mismatching angle of first laser and rubidium atom is Δ1, so that it is determined that the first polarization
Light；
Atom is respectively positioned on the rubidium atom assemblage of the first energy level, is excited by first polarised light so that the first energy level
Rubidium atomic transition to third energy level, generate the first transition light, while the rubidium atomic transition of third energy level is to the second energy level；
Polarization module determines the first signal light for carrying out polarization manipulation to the first transition light；
Time delay module is polarized, for carrying out delay process, polarization manipulation, the frequency for adjusting second laser to second laser,
So that the second mismatching angle of second laser and rubidium atom is Δ2, so that it is determined that the second polarised light；And the second polarised light excitation
The single rubidium atom assemblage so that the rubidium atomic transition of the second energy level to third energy level generates the second transition light, while third
The rubidium atomic transition of energy level is to the first energy level；
Polarize tuning module, for changing the polarization direction of the second transition light, and to the second transition light into
Row polarization manipulation determines second signal light；
Wherein, the first mismatching angle Δ1With the second mismatching angle Δ2Meet relationship：Δ1-Δ2=ω12, ω12It is the first energy
The difference on the frequency of grade and the second energy level, first signal light are a pair of full same sex signal light with second signal light.
In some embodiments of the invention, the polarization adjustment module includes：
First pump laser, for generating first laser；
First polarization beam apparatus, for carrying out polarization manipulation to the first laser；
First slides of λ/2, for changing the polarization direction of the first laser；
First sound-optic modulator, for changing the frequency of the first laser.
In some embodiments of the invention, the polarization time delay module includes：
Second pump laser, for generating second laser；
Second polarization beam apparatus, for carrying out polarization manipulation to the second laser；
Second sound-optic modulator, for changing the frequency of the second laser；
Arbitrary-function generator, the switch off time for controlling the second pump laser, to the second laser that is delayed.
In some embodiments of the invention, the polarization tuning module includes：
2nd slides of λ/2, for changing the polarization direction of the second transition light；
Third polarization beam apparatus, for carrying out polarization manipulation to the second transition light.
In some embodiments of the invention, the polarization direction of the first laser and second signal light is first direction,
The polarization direction of the second laser and the first signal light is second direction, and the first direction hangs down mutually with second direction
Directly.
In some embodiments of the invention, further include：
First optical fiber, for receiving first signal light；
Second optical fiber, for receiving the second signal light.
In some embodiments of the invention, first pump laser and the second pump laser are two pole of outer lumen type
Pipe laser, and the power of first laser and second laser is respectively 100mW and 20mW.
Another aspect of the present invention, additionally provide it is a kind of prepared entirely with the method for two-photon based on single atom assemblage, packet
It includes：
Is carried out by polarization manipulation, change the polarization direction of first laser and changes the frequency of the first laser for first laser
Rate so that the first mismatching angle of first laser and rubidium atom is Δ1, so that it is determined that the first polarised light；
Atom is respectively positioned on the rubidium atom assemblage of the first energy level, is excited by first polarised light so that the first energy level
Rubidium atomic transition to third energy level, generate the first transition light, while the rubidium atomic transition of third energy level is to the second energy level；
Polarization manipulation is carried out to the first transition light, determines the first signal light；
Delay process, polarization manipulation, the frequency for adjusting second laser are carried out to second laser so that second laser is former with rubidium
Second mismatching angle of son is Δ2, so that it is determined that the second polarised light；And second polarised light excites the single rubidium atom system
It is comprehensive so that the rubidium atomic transition of the second energy level to third energy level generates the second transition light, while the rubidium atomic transition of third energy level
To the first energy level；
Change the polarization direction of the second transition light, and polarization manipulation is carried out to the second transition light, determines the
Binary signal light；
Wherein, the first mismatching angle Δ1With the second mismatching angle Δ2Meet relationship：Δ1-Δ2=ω12, ω12It is the first energy
The difference on the frequency of grade and the second energy level, first signal light are a pair of full same sex signal light with second signal light.
In some embodiments of the invention, the polarization direction of the first laser and second signal light is first direction,
The polarization direction of the second laser and the first signal light is second direction, and the first direction hangs down mutually with second direction
Directly.
In some embodiments of the invention, carrying out delay process to second laser is controlled by arbitrary-function generator
Second pump laser emits the time realization of second laser.
(3) advantageous effect
The present invention's is prepared based on single atom assemblage entirely with the device and method of two-photon, compared to the prior art, until
There is following advantages less：
1, the present invention is based on rubidium atom assemblages, when the first mismatching angle Δ1With the second mismatching angle Δ2Meet Δ1-Δ2=ω12,
In addition adjusting the delay of second laser, a pair of complete same two-photon, the multiple atom systems of use with the prior art can be prepared
It is comprehensive to prepare multiple photons pair, then any two of which photon is compared to carrying out Bell state measurements, the present invention has operation
Simply, feature simple for structure.
2, the present invention is widely used, and can be used for the task of the quantum information processing of multi-photon Entangled State, such as quantum meter
It calculates, quantum accurate measurement etc..
Description of the drawings
Fig. 1 is being prepared entirely with the structural schematic diagram of the device of two-photon based on single atom assemblage for the embodiment of the present invention.
Fig. 2 is the structural schematic diagram of the polarization adjustment module of the embodiment of the present invention.
Fig. 3 is the level structure schematic diagram of the rubidium atom assemblage of the embodiment of the present invention.
Fig. 4 is the structural schematic diagram of the polarization adjustment module of the embodiment of the present invention.
Fig. 5 is the structural schematic diagram of the polarization tuning module of the embodiment of the present invention.
Fig. 6 is the experimental provision schematic diagram of the inspection full same sex of two-photon of the embodiment of the present invention.
Fig. 7 is the HOM interference curve schematic diagrames that the complete same two-photon of Fig. 6 is measured.
Fig. 8 is being prepared entirely with the step schematic diagram of the method for two-photon based on single atom assemblage for the embodiment of the present invention.
Specific implementation mode
The prior art prepares multiple photons pair using multiple atom assemblages mostly, then to any two of which photon pair
Bell state measurement is carried out, therefore there are complicated for operation, the cumbersome technological deficiencies of structure, in view of this, the present invention provides one kind
It is prepared entirely with the dress of two-photon and method based on single atom assemblage, rubidium atom assemblage is based on, when the first mismatching angle Δ1With second
Mismatching angle Δ2Meet Δ1-Δ2=ω12, in addition adjusting the delay of second laser, a pair of complete same two-photon, tool can be prepared
There is feature easy to operate, simple for structure.
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with specific embodiment, and reference
Attached drawing, the present invention is described in more detail.
The one side of the embodiment of the present invention, provide it is a kind of prepared entirely with the device of two-photon based on single atom assemblage,
Fig. 1 is being prepared entirely with the structural schematic diagram of the device of two-photon, such as Fig. 1 institutes based on single atom assemblage for the embodiment of the present invention
Show, which includes polarization adjustment module 1, rubidium atom assemblage 2, polarization module 3, polarization time delay module 4 and polarization tuning module
5。
Next, each module will be described in detail in conjunction with attached drawing.
Polarize adjustment module 1, for first laser carry out polarization manipulation, change first laser polarization direction and change
Become the frequency of the first laser so that the first mismatching angle of first laser and rubidium atom is Δ1, so that it is determined that the first polarization
Light.Fig. 2 is the structural schematic diagram of the polarization adjustment module of the embodiment of the present invention, as shown in Fig. 2, in some embodiments, polarization
Adjustment module 1 includes the first pump laser 11, the first polarization beam apparatus 12, the first slides of λ/2 13 and first sound-optic modulator
14。
Wherein, the first pump laser 11, for generating first laser；First polarization beam apparatus 12 (PBS), for institute
It states first laser and carries out polarization manipulation；First slides of λ/2 13, for changing the polarization direction of the first laser；First acousto-optic
Modulator 14 (generally low frequency acousto-optic modulator), for changing the frequency of the first laser.It should be noted that first is inclined
The shake position of beam splitter 12, the first slides of λ/2 13 and first sound-optic modulator 14 can adjust, and in the first pump laser
After 11.
Fig. 3 is the level structure schematic diagram of the rubidium atom assemblage of the embodiment of the present invention, as shown in figure 3, atom is respectively positioned on the
The rubidium atom assemblage 2 of one energy level, is excited by first polarised light so that the rubidium atomic transition of the first energy level to third energy
Grade generates the first transition light, while the rubidium atomic transition of third energy level is to the second energy level.
It is because being imitated using the spontaneous four-wave mixing of rubidium atom using the special level structure of rubidium atom in the present embodiment
Photon pair should be generated, due to the conservation of energy condition in non-linear process, the photon frequency of generation is identical, therefore can be light
It changes places and generates duplicate two-photon, and the two-photon generated is capable of the bandwidth of matched atoms memory, for later based on more
Important basis is established in the quantum information processing of photon.
Fig. 3 is refer again to, the atomic group of two-dimentional cigar type, the optical thickness of atom can be prepared by the technology of Magneto-Optical Trap
Can be 20, the size of atomic group is about 2mm × 2mm × 30mm.Rubidium atom in the invention be in double Λ types (i.e. first laser,
The shape of first signal light, second laser and second signal light composition), including the first energy level, the second energy level and third energy level, point
Do not correspond to rubidium (85Rb) atomic energy level 5S1/2(F=2), 5S1/2(F=3) and 5P1/2(F=3).
Polarization module 3 (can be polarization beam apparatus) determines first for carrying out polarization manipulation to the first transition light
Signal light.
Time delay module 4 is polarized, for carrying out delay process, polarization manipulation, the frequency for adjusting second laser to second laser,
So that the second mismatching angle of second laser and rubidium atom is Δ2, so that it is determined that the second polarised light；And the second polarised light excitation
The single rubidium atom assemblage 2 so that the rubidium atomic transition of the second energy level to third energy level (incorporated by reference to Fig. 3) generates the second jump
Move light, while the rubidium atomic transition of third energy level is to the first energy level.
Fig. 4 is the structural schematic diagram of the polarization adjustment module of the embodiment of the present invention, the mould as shown in figure 4, polarization is delayed
Block 4 includes：Second pump laser 41, the second polarization beam apparatus 42, second sound-optic modulator 43 and arbitrary-function generator 44.
Wherein, the second pump laser 41, for generating second laser；First pump laser 11 and second pumps
Laser 41 is outer lumen type diode laser (such as DL100, Toptica, wavelength can be 795nm), and first laser
Power with second laser is respectively 100mW and 20mW.Second polarization beam apparatus 42, for being polarized to the second laser
Processing；Second sound-optic modulator 43, for changing the frequency of the second laser；Arbitrary-function generator 44 (such as
AFG3252), it is used to control the switch off time of the second pump laser 41, to the second laser that is delayed.It should be noted that the
The position of two polarization beam apparatus 42, second sound-optic modulator 43 and arbitrary-function generator 44 can adjust, and in the second pump
After Pu laser 41.
Polarize tuning module 5, for changing the polarization direction of the second transition light, and to the second transition light into
Row polarization manipulation determines second signal light.
Fig. 5 is the structural schematic diagram of the polarization tuning module of the embodiment of the present invention, as shown in figure 5, the polarization tuning mould
Block 5 includes：2nd slides of λ/2 51 and third polarization beam apparatus 52.Wherein, the 2nd slides of λ/2 51, for changing second jump
Move the polarization direction of light；Third polarization beam apparatus 52, for carrying out polarization manipulation to the second transition light.It needs to illustrate
It is that the position of the 2nd slides of λ/2 51 and third polarization beam apparatus 52 can be according to practical adjustment.
It should be noted that the first mismatching angle Δ1With the second mismatching angle Δ2Meet relationship：Δ1-Δ2=ω12, ω12
It is the difference on the frequency of the first energy level and the second energy level, first signal light is a pair of full same sex signal light with second signal light.This
Invention is based primarily upon non-linear spontaneous four-wave mixing, and process needs to meet momentum matching condition and law of conservation of energy,
In the embodiment of the present invention, the angle between laser and signal light is about 3 °, and the polarization of first laser and second laser is vertical respectively
The polarization of straight and horizontal polarization, the first signal light and second signal light is horizontal and vertical polarization respectively, meets four-wave mixing
Journey Linear Momentum and the conservation of angular momentum.Due to meeting between first laser, second laser, the first signal light and second signal light
Energy level closed loop can generate a pair of full same sex signal light along with the delay of relationship and second laser that two mismatching angles meet.
In addition, the device can also include：First optical fiber, for receiving first signal light；Second optical fiber, for connecing
Receive the second signal light, wherein the receiving efficiency of the two optical fiber can be more than 75%, prevent be prepared two signals
The excessive attenuation of light.
Fig. 6 is the experimental provision schematic diagram of the inspection full same sex of two-photon of the embodiment of the present invention, and Fig. 7 is the complete with double of Fig. 6
The HOM interference curve schematic diagrames that photon survey comes out, as shown in Figure 6 and Figure 7, the period of the operation of the experimental provision is 100Hz,
It being prepared including 8.6 milliseconds of imprisons and initial state, remaining 1.4 milliseconds of the time is experiment window, includes 2800 sequential cycle,
Each cycle has 500ns.
By adjusting second laser to the delay of adjusting wherein second signal light, the different countings that can be obtained, the
The delay of binary signal light is to pass through obtained by the time sequential pulse by adjusting arbitrary-function generator AFG3252 and increase electric pulse
Delay the departure time control acousto-optic modulator delay, finally adjust second laser read access time, finally realize time sequence
Adjusting on row.
It is controlled in the window of 255ns+/- 5ns or so when time series, it was obvious that counting rate is lower
Effect, this is because entirely caused by the interference with photon.On the contrary, if time series is placed on 200ns or 300ns,
Interference phenomenon disappears, and a pair of of the optical signal obtained at this time is not complete same optical signal.It is also needed in measurement in the first signal light
50 meters of single-mode polarization maintaining fiber is introduced in light path into line delay, fiber work wavelength 795nm.That is, arbitrary function occurs
Device approaches the delay that the first signal light generates with the single-mode polarization maintaining fiber delay that second laser generates, to ensure two
Road signal light can reach the beam splitter in Fig. 6 simultaneously.
The counting rate of the complete same two-photon finally obtained is 3/s, and the time width of two-photon wave packet is 100ns+/- 5,
Photon line width is in 10MHz+/- 2MHz.The result demonstrates the two-photon prepared through the invention with complete same well
Property, to provide reference with the related application of multi-photon entirely based on the preparation of monatomic assemblage later.
Fig. 8 is being prepared entirely with the step schematic diagram of the method for two-photon based on single atom assemblage for the embodiment of the present invention,
As shown in figure 8, this method includes：
S1, polarization manipulation is carried out to first laser, change the polarization direction of first laser and changes the first laser
Frequency so that the first mismatching angle of first laser and rubidium atom is Δ1, so that it is determined that the first polarised light；
S2, atom are respectively positioned on the rubidium atom assemblage of the first energy level, are excited by first polarised light so that the first energy
The rubidium atomic transition of grade generates the first transition light to third energy level, while the rubidium atomic transition of third energy level is to the second energy level；
S3, polarization manipulation is carried out to the first transition light, determines the first signal light；
S4, to second laser carry out delay process, polarization manipulation, adjust second laser frequency so that second laser with
Second mismatching angle of rubidium atom is Δ2, so that it is determined that the second polarised light；And second polarised light excites the single rubidium atom
Assemblage so that the rubidium atomic transition of the second energy level to third energy level generates the second transition light, while the rubidium atom jump of third energy level
Adjourn to the first energy level；
Wherein, it is to control the transmitting of the second pump laser by arbitrary-function generator to carry out delay process to second laser
What the time of second laser was realized.
S5, the polarization direction for changing the second transition light, and polarization manipulation is carried out to the second transition light, it determines
Second signal light；
Wherein, the first mismatching angle Δ1With the second mismatching angle Δ2Meet relationship：Δ1-Δ2=ω12, ω12It is the first energy
The difference on the frequency of grade and the second energy level, first signal light are a pair of full same sex signal light with second signal light.
In addition, the polarization direction of the first laser and second signal light is first direction, the second laser and first
The polarization direction of signal light is second direction, and the first direction and second direction are orthogonal.
To sum up, of the invention to be prepared entirely with the device and method of two-photon based on single atom assemblage, it is double based on atom
Λ type atomic structures using the pumping light field of large detuning, and adjust the pulse delay of second laser, can generate easily
Complete the same two-photon, and the two-photon generated is capable of the bandwidth of matched atoms memory, for the quantum based on multi-photon later
Important basis is established in information processing.
It unless there are known entitled phase otherwise anticipates, the numerical parameter in this specification and appended claims is approximation, energy
Enough required characteristic changings obtained by content through the invention.Specifically, all be used in specification and claim
The number of the middle content for indicating composition, reaction condition etc., it is thus understood that repaiied by the term of " about " in all situations
Decorations.Under normal circumstances, the meaning expressed refers to including by specific quantity ± 10% variation in some embodiments, at some
± 5% variation in embodiment, ± 1% variation in some embodiments, in some embodiments ± 0.5% variation.
Furthermore "comprising" does not exclude the presence of element or step not listed in the claims." one " before element
Or "one" does not exclude the presence of multiple such elements.
The word of specification and ordinal number such as " first ", " second ", " third " etc. used in claim, with modification
Corresponding element, itself is not meant to that the element has any ordinal number, does not also represent the suitable of a certain element and another element
Sequence in sequence or manufacturing method, the use of those ordinal numbers are only used for enabling the element with certain name and another tool
There is the element of identical name that can make clear differentiation.
Particular embodiments described above has carried out further in detail the purpose of the present invention, technical solution and advantageous effect
It describes in detail bright, it should be understood that the above is only a specific embodiment of the present invention, is not intended to restrict the invention, it is all
Within the spirit and principles in the present invention, any modification, equivalent substitution, improvement and etc. done should be included in the guarantor of the present invention
Within the scope of shield.
Claims (10)
1. a kind of prepared based on single atom assemblage entirely with the device of two-photon, including：
Adjustment module is polarized, for carrying out polarization manipulation to first laser, changing the polarization direction of first laser and changing institute
State the frequency of first laser so that the first mismatching angle of first laser and rubidium atom is Δ1, so that it is determined that the first polarised light；
Atom is respectively positioned on the rubidium atom assemblage of the first energy level, is excited by first polarised light so that the rubidium of the first energy level
Atomic transition generates the first transition light to third energy level, while the rubidium atomic transition of third energy level is to the second energy level；
Polarization module determines the first signal light for carrying out polarization manipulation to the first transition light；
Time delay module is polarized, for carrying out delay process, polarization manipulation, the frequency for adjusting second laser to second laser so that
Second mismatching angle of second laser and rubidium atom is Δ2, so that it is determined that the second polarised light；And described in the second polarised light excitation
Single rubidium atom assemblage so that the rubidium atomic transition of the second energy level to third energy level generates the second transition light, while third energy level
Rubidium atomic transition to the first energy level；
Tuning module is polarized, for changing the polarization direction of the second transition light, and the second transition light is carried out inclined
It shakes processing, determines second signal light；
Wherein, the first mismatching angle Δ1With the second mismatching angle Δ2Meet relationship：Δ1-Δ2=ω12, ω12The first energy level with
The difference on the frequency of second energy level, first signal light are a pair of full same sex signal light with second signal light.
2. the apparatus according to claim 1, wherein the polarization adjustment module includes：
First pump laser, for generating first laser；
First polarization beam apparatus, for carrying out polarization manipulation to the first laser；
First slides of λ/2, for changing the polarization direction of the first laser；
First sound-optic modulator, for changing the frequency of the first laser.
3. the apparatus of claim 2, wherein the polarization time delay module includes：
Second pump laser, for generating second laser；
Second polarization beam apparatus, for carrying out polarization manipulation to the second laser；
Second sound-optic modulator, for changing the frequency of the second laser；
Arbitrary-function generator, the switch off time for controlling the second pump laser, to the second laser that is delayed.
4. the apparatus according to claim 1, wherein the polarization tuning module includes：
2nd slides of λ/2, for changing the polarization direction of the second transition light；
Third polarization beam apparatus, for carrying out polarization manipulation to the second transition light.
5. the apparatus according to claim 1, wherein the polarization direction of the first laser and second signal light is first party
To the polarization direction of the second laser and the first signal light is second direction, and the first direction and second direction are mutual
Vertically.
6. the apparatus according to claim 1, wherein further include：
First optical fiber, for receiving first signal light；
Second optical fiber, for receiving the second signal light.
7. device according to claim 3, wherein first pump laser and the second pump laser are outer lumen type
Diode laser, and the power of first laser and second laser is respectively 100mW and 20mW.
8. a method of it is prepared entirely with two-photon based on single atom assemblage, including：
Is carried out by polarization manipulation, change the polarization direction of first laser and changes the frequency of the first laser for first laser,
So that the first mismatching angle of first laser and rubidium atom is Δ1, so that it is determined that the first polarised light；
Atom is respectively positioned on the rubidium atom assemblage of the first energy level, is excited by first polarised light so that the rubidium of the first energy level
Atomic transition generates the first transition light to third energy level, while the rubidium atomic transition of third energy level is to the second energy level；
Polarization manipulation is carried out to the first transition light, determines the first signal light；
Delay process, polarization manipulation, the frequency for adjusting second laser are carried out to second laser so that second laser and rubidium atom
Second mismatching angle is Δ2, so that it is determined that the second polarised light；And second polarised light excites the single rubidium atom assemblage, makes
The second energy level rubidium atomic transition to third energy level, generate the second transition light, while the rubidium atomic transition of third energy level is to the
One energy level；
Change the polarization direction of the second transition light, and polarization manipulation is carried out to the second transition light, determines the second letter
Number light；
Wherein, the first mismatching angle Δ1With the second mismatching angle Δ2Meet relationship：Δ1-Δ2=ω12, ω12The first energy level with
The difference on the frequency of second energy level, first signal light are a pair of full same sex signal light with second signal light.
9. according to the method described in claim 8, wherein, the polarization direction of the first laser and second signal light is first party
To the polarization direction of the second laser and the first signal light is second direction, and the first direction and second direction are mutual
Vertically.
10. according to the method described in claim 8, wherein, carrying out delay process to second laser is occurred by arbitrary function
Device controls the time realization of the second pump laser transmitting second laser.
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| US5657340A (en) * | 1996-04-19 | 1997-08-12 | The Aerospace Corporation | Rubidium atomic clock with fluorescence optical pumping and method using same |
| US20030099272A1 (en) * | 2001-10-23 | 2003-05-29 | Krupke William F. | Diode-pumped Alkali laser |
| WO2014205413A2 (en) * | 2013-06-21 | 2014-12-24 | Invenio Imaging Inc. | Multi-photon systems and methods |
| CN104953460A (en) * | 2015-06-05 | 2015-09-30 | 北京大学 | Two-photon atomic optical filter and optical signal filtering method implemented by aid of same |
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