CN204925576U - Device is realized to multimode quantum light source based on four -wave mixing process in rubidium steam - Google Patents
Device is realized to multimode quantum light source based on four -wave mixing process in rubidium steam Download PDFInfo
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- CN204925576U CN204925576U CN201520628003.XU CN201520628003U CN204925576U CN 204925576 U CN204925576 U CN 204925576U CN 201520628003 U CN201520628003 U CN 201520628003U CN 204925576 U CN204925576 U CN 204925576U
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Abstract
The utility model discloses a device is realized to multimode quantum light source based on four -wave mixing process in rubidium steam, the laser that titanium precious stone laser instrument sent divide into first laser beam and second laser beam in proper order behind 12 wave plates and polarization beam splitter, first laser beam is jeted into in proper order and is reflected back acoustic optic modem behind acoustic optic modem and 14 wave plates in proper order and generate probe light through single mode fiber, and the second laser beam loops through single mode fiber, 12 wave plates, polarization beam splitter, 14 wave plates and circular cone prism and produces pumping light, and probe light sum pumping light emergence four -wave mixing in the rubidium pond reacts production conjugation light, pumping light is eliminated by the gloomy prism of glan tom, and probe light sees through from the speculum that punches, the speculum reflection of being punched of conjugation light, and the detector of difference input respectively to probe light sum conjugation light, is connected to spectral analyser behind the signal of telecommunication process subtracter that the detector was exported, and the analysis obtains the quantum and compresses. The utility model discloses utilize degrees of freedom to realize super large yardstick multimode quantum attitude.
Description
Technical field
The utility model belongs to quantum information process area, particularly a kind of multimodulus sub-light source implement device based on four-wave mixing process in rubidium steam.
Background technology
Many components quantum state has important effect in quantum optics and quantum information process.Therefore, many groups are all striving for many components quantum state always, and achieve certain achievement.The classic method realizing continuous variable many components quantum state produces continuous variable quantum network with the single-mode squeezing light beam produced from optical parametric oscillator and multiple beam splitter.The method of this generation continuous variable many components state lacks extensibility, because can become very complicated along with the increase experimental provision of quantum modulus.In order to overcome this problem, some groups propose to realize continuous variable many components quantum state with single multimode non-linear process, and as by the different spaces region utilizing single light beam, multiple longitudinal direction or Modulation obtain many components quantum state.Recently, several group achieves the quantum network of super-large dimension in frequency-domain and time-domain.But, also do not have group to utilize spatial degrees of freedom to realize super-large dimension quantum state.
Spatial degrees of freedom cannot be utilized to realize the technical matters of super-large dimension quantum state to solve above-mentioned prior art, the utility model proposes a kind of multimodulus sub-light source implement device based on four-wave mixing process in rubidium steam.
Utility model content
The utility model proposes a kind of multimodulus sub-light source implement device based on four-wave mixing process in rubidium steam, the laser that ti sapphire laser sends is divided into the first laser beam and the second laser beam successively after 1/2 wave plate and polarization beam splitter, be reflected back described acousto-optic modulator successively after described first laser beam injects acousto-optic modulator and quarter wave plate successively, change Gaussian beam into through single-mode fiber and generate probe light, described probe light is injected Glan-Foucault laser prism and is reflexed in rubidium pond, described second laser beam produces pump light by single-mode fiber, 1/2 wave plate, polarization beam splitter, quarter wave plate and circular cone prism successively, described pump light is reflected back described polarization beam splitter successively, described pump light is reflexed in described Glan-Foucault laser prism by described polarization beam splitter successively, and described pump light injects described rubidium pond through described Glan-Foucault laser prism, four-wave mixing reaction is there is and produces conjugate beam in described probe light and described pump light in described rubidium pond, described probe light, pump light and described conjugate beam enter in Glan thomson prism through 1/2 wave plate, described pump light is eliminated by described Glan thomson prism, described probe light from containing reflecting mirror through, described conjugate beam is reflected by described containing reflecting mirror, described probe light and described conjugate beam input different detectors respectively, the electric signal that described detector exports is connected to spectrum analyzer after subtracter, record signal after described probe light and described conjugate beam subtract each other lower than standard quantum limit, realization utilizes spatial degrees of freedom to produce super-large dimension multimode quantum state.
Described in the utility model based in the multimodulus sub-light source implement device of four-wave mixing process in rubidium steam, the pump light produced through described circular cone prism obtains the intensity difference compression that maximal pressure contracting degree is-2.4dB in four-wave mixing process.
Described in the utility model based in the multimodulus sub-light source implement device of four-wave mixing process in rubidium steam, described acousto-optic modulator is connected with radio-frequency signal generator and amplifier, and described radio-frequency signal generator and described amplifier drive described acousto-optic modulator by the frequency single frequency displacement 1.521GHz of described first laser beam.
Described in the utility model based in the multimodulus sub-light source implement device of four-wave mixing process in rubidium steam, the radiation angle of described pump light and described probe light is 8.5mrad.
Described in the utility model based in the multimodulus sub-light source implement device of four-wave mixing process in rubidium steam, the length in described rubidium pond is 12.5 millimeters, and temperature when there is four-wave mixing is heated to 124 degrees Celsius.
Described in the utility model based in the multimodulus sub-light source implement device of four-wave mixing process in rubidium steam, reflection place of described Glan thomson prism is provided with optical beam dump, for collecting the residual pump light do not eliminated.
The beneficial effects of the utility model are:
The utility model utilizes cone of radiation light beam to utilize as pump light
85between the single Gaussian beam of the nondegenerate two-photon process process generation of two " ∧ " level structure of Rb atom and a cone of radiation light beam, there is Quantum Correlation, and obtain the intensity difference intensity of compression of-2.4dB experimentally.
The utility model utilizes
85the nondegenerate two-photon process process of two " ∧ " level structure of Rb atom produces between single Gaussian beam and a cone of radiation light beam has Quantum Correlation, and the intensity difference noise of this two-beam is lower than standard quantum limit.By pump light frequency setting extremely
85rb atom D1 line (5S
1/2→ 5P
1/2, 795nm) and blue off resonance 1.4GHz place, away from
85the dopplerbroadening of Rb atom, can effectively avoid pump light spontaneous radiation on the impact of result of detection.The utility model, owing to having experimental provision compact, non-phase sensitivity, being easy to the characteristics such as expansion, has potential value in quantum information and quantum imaging.
Accompanying drawing explanation
Fig. 1 is the structural drawing based on the multimodulus sub-light source implement device of four-wave mixing process in rubidium steam in specific embodiment.
Fig. 2 is
85two " ∧ " structure of Rb atom and nondegenerate two-photon process process.
Embodiment
In conjunction with following specific embodiments and the drawings, the utility model is described in further detail.Implement process of the present utility model, condition, experimental technique etc., except the following content mentioned specially, be universal knowledege and the common practise of this area, the utility model is not particularly limited content.
As shown in Figure 1, the light of ti sapphire laser 1 sends a branch of wavelength to be 795nm power be 500mW, laser frequency is
85rb atom D1 line (5S
1/2→ 5P
1/2, 795nm) and blue off resonance 1.4GHz.Use 1/2 wave plate 3 and polarization beam splitter 4 that this laser beam is divided into the first laser beam and the second laser beam.Wherein, the first laser beam is the light of horizontal polarization, and luminous power is 50mW, and the second laser beam is the light of vertical polarization, and luminous power is 450mW.
First laser beam twice power after the acousto-optic modulator 5 and quarter wave plate 6 of Einstein shift 1.521GHz is 50 μ W, Einstein shift 3.042GHz, and becomes orthogonal polarized light.Use a single-mode fiber 7 that first laser beam is become good Gaussian beam, and regulate its power to 40 μ W as probe light.
Power is that second laser of 450mW also becomes good Gaussian beam through single-mode fiber 7, and then incide a cone prism 8 and produce the cone of radiation light beam that power is 350mW, cone of radiation angle is 7.8mrad, using the cone of radiation light beam that produces as pump light.
Use lens 9 that the waist spot of pump light and probe light is adjusted to 330 μm and 240 μm respectively, using Glan-Foucault laser prism 10 that two-beam is intersected near the end of rubidium pond 11, is 8.5mrad at the radiation angle of intersection pump light.Rubidium pond 11 is heated to 124 DEG C to improve rubidium vapour density, strengthens the nonlinear effect in rubidium pond 11.
As shown in Figure 2,5S
1/2, 5P
1/2for
85the fine structure of Rb atom, F=2, F=3 are fine structure 5S
1/2hyperfine splitting, its energy level difference is 3.036GHz.Dotted line is depicted as
85the virtual level of Rb atom.According to four-wave mixing principle and above-mentioned experiment condition, behind rubidium pond 11, probe light power will be amplified to 54.2 μ W, according to phase-matching condition, newly produce be similarly the radiation conjugate beam that vertical polarization power is 76.5 μ W in the outside of pump light.
1/2 wave plate 3 and extinction ratio is used to be 10
5: the Glan thomson prism 12 cancellation major part pump light of 1, remaining pump light optical beam dump 13 blocks.Because probe light and conjugate beam are orthogonal polarized light, Glan thomson prism 12 can not have an impact to it.
The centre of probe light from containing reflecting mirror 14 is passed, conjugate beam reflects at containing reflecting mirror 14 place, then probe light and conjugate beam are injected into two detectors 15 respectively, the electric signal produced by exploratory probe light and conjugate beam by detector 15 is connected to spectrum analyzer 17 after subtracter 16, and spectrum analyzer 17 pairs of signals process the frequency spectrum of rear output signal.Be that the two-beam that the coherent light of 130.7 μ W is divided into power equal is injected into two detectors 15, respectively through subtracter 16 and spectrum analyzer 17 by a beam power.Spectrum analyzer 17 is for carrying out the frequency spectrum processing rear output signal.
Usually be that probe light is injected into two detectors 15 respectively with the two-beam that the coherent light of conjugation luminous power sum is divided into power equal by a beam power, through subtracter 16 and spectrum analyzer 17, the frequency spectrum obtained is standard quantum limit.The frequency spectrum of the signal after the probe light recorded due to the present embodiment intermediate frequency spectrum analyser 17 and conjugate beam subtract each other, lower than this standard quantum limit, therefore proves that the utility model achieves and utilizes spatial degrees of freedom to produce super-large dimension multimode quantum state.
Protection content of the present utility model is not limited to above embodiment.Under the spirit and scope not deviating from utility model design, the change that those skilled in the art can expect and advantage are all included in the utility model, and are protection domain with appending claims.
Claims (6)
1. based on a multimodulus sub-light source implement device for four-wave mixing process in rubidium steam, it is characterized in that, the laser that ti sapphire laser (1) sends is divided into the first laser beam and the second laser beam successively after 1/2 wave plate and polarization beam splitter;
Described first laser beam is reflected back described acousto-optic modulator (5) after injecting acousto-optic modulator (5) and quarter wave plate successively successively, change Gaussian beam into through single-mode fiber and generate probe light, described probe light is injected Glan-Foucault laser prism (10) and is reflexed in rubidium pond (11);
Described second laser beam produces pump light by single-mode fiber, 1/2 wave plate, polarization beam splitter, quarter wave plate and circular cone prism (8) successively, described pump light is reflected back described polarization beam splitter successively, described pump light is reflexed in described Glan-Foucault laser prism (10) by described polarization beam splitter successively, and described pump light injects described rubidium pond (11) through described Glan-Foucault laser prism (10);
Four-wave mixing reaction is there is and produces conjugate beam in described probe light and described pump light in described rubidium pond (11);
Described probe light, pump light and described conjugate beam enter in Glan thomson prism (12) through 1/2 wave plate, described pump light is eliminated by described Glan thomson prism (12), described probe light from containing reflecting mirror (14) through, described conjugate beam is reflected by described containing reflecting mirror (14), described probe light and described conjugate beam input different detectors (15) respectively, the electric signal that described detector (15) exports is connected to spectrum analyzer (17) after subtracter (16), record signal after described probe light and described conjugate beam subtract each other lower than standard quantum limit, realization utilizes spatial degrees of freedom to produce super-large dimension multimode quantum state.
2. as claimed in claim 1 based on the multimodulus sub-light source implement device of four-wave mixing process in rubidium steam, it is characterized in that, the pump light produced through described circular cone prism (8) obtains the intensity difference compression that maximal pressure contracting degree is-2.4dB in four-wave mixing process.
3. as claimed in claim 1 based on the multimodulus sub-light source implement device of four-wave mixing process in rubidium steam, it is characterized in that, described acousto-optic modulator (5) is connected with radio-frequency signal generator and amplifier, and described radio-frequency signal generator and described amplifier drive described acousto-optic modulator (5) by the frequency single frequency displacement 1.521GHz of described first laser beam.
4., as claimed in claim 1 based on the multimodulus sub-light source implement device of four-wave mixing process in rubidium steam, it is characterized in that, the radiation angle of described pump light and described probe light is 8.5mrad.
5. as claimed in claim 1 based on the multimodulus sub-light source implement device of four-wave mixing process in rubidium steam, it is characterized in that, the length of described rubidium pond (11) is 12.5 millimeters, and temperature when there is four-wave mixing is heated to 124 degrees Celsius.
6. as claimed in claim 1 based on the multimodulus sub-light source implement device of four-wave mixing process in rubidium steam, it is characterized in that, reflection place of described Glan thomson prism (12) is provided with optical beam dump (13), for collecting the residual pump light do not eliminated.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105116663A (en) * | 2015-08-19 | 2015-12-02 | 华东师范大学 | Multi-mode quantum light source realization device based on four-wave mixing process in rubidium vapor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105116663A (en) * | 2015-08-19 | 2015-12-02 | 华东师范大学 | Multi-mode quantum light source realization device based on four-wave mixing process in rubidium vapor |
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