CN100460975C - Four-photon resonance entangled photon pairs generator - Google Patents
Four-photon resonance entangled photon pairs generator Download PDFInfo
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- CN100460975C CN100460975C CNB2007100370403A CN200710037040A CN100460975C CN 100460975 C CN100460975 C CN 100460975C CN B2007100370403 A CNB2007100370403 A CN B2007100370403A CN 200710037040 A CN200710037040 A CN 200710037040A CN 100460975 C CN100460975 C CN 100460975C
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- polarizer
- cylindrical transparent
- filter
- transparent containers
- catoptron
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Abstract
A four-photon resonance entangled photon pair generator belongs to the quantum science and technology field. The invention includes: the first and second lenses, the cylindrical transparent containers, the first and second mirrors, the first and second filters, and the first and second polarizer; the first and second lenses has conjugate geometry configuration, and the focusing line coincides the main axis of the cylindrical transparent containers, and the first mirror, the first filter and the first polarizer are in the one exhaled light path of the cylindrical transparent containers, placed coaxial according to the order of the first mirror, the first filter, the first polarizer; the second mirror, the second filter and the second polarizer are located in the other exhaled light path of the cylindrical transparent containers in the same way; the two incident pump light passes the lens to pool in the medium of the cylindrical transparent containers. The invention can make the generated entangled photon pair not having to go through the dispersive media, avoiding the additional effect which is detrimental to practical application.
Description
Technical field
What the present invention relates to is a kind of generator of Instrument technology field, particularly a kind of four-photon resonance entangled photon pair generator.
Background technology
Entangled photons is to there being a lot of mysteries quantum mechanics characteristic cleverly, and these characteristics can be applied to fields such as quantum metering, quantum calculation, quantum information (communication), quantum photoetching.In all related application, most critical be to generate two-photon to tangle attitude and measure the correlativity of tangling attitude, promptly produce entangled photons effectively to light source.
Find through literature search prior art, international patent application no is PCT/US01/44889, the patent that name is called " High-Flux Entangled Photon Generation via Parameteric Processes in aLaser Cavity " (" produce high brightness by the parametric process in the laserresonator and tangle light ") proposes, change (spontaneous parametric down-conversion down by spontaneous parameter, SPDC) it is right that nonlinear optical effect produces entangled photons, in a resonator cavity, shine medium with pump light, make the medium stimulated radiation produce laser, laser can amplify in resonator cavity, in this resonator cavity or another auxiliary resonance chamber, can use the mode of optical frequency mixing to change light wavelength, entangled photons produces the nonlinear optical effect of changing under the spontaneous parameter of use in lasing resonator cavity or another auxiliary resonance chamber, and the entangled photons of this method is very low by (maximum 10 to producing efficient
-5), and the entangled photons that produces need propagate in dispersive medium (can produce the crystal of the nonlinear optical effect of SPDC), and two-photon ripple bag will scatter gradually like this, makes the reduction of second order Glauber correlation function.These additive effects are unfavorable for the practical application that entangled photons is right, particularly remote clock synchronization etc. need need precise time information application.
Summary of the invention
The objective of the invention is to overcome deficiency of the prior art, a kind of four-photon resonance entangled photon pair generator is provided, make it have higher entangled photons to producing efficient, and the entangled photons that produces can avoid being unfavorable for the additive effect of entangled photons to practical application to not passing through dispersive medium.
The present invention is achieved through the following technical solutions, the present invention includes: first and second post lens, cylindrical transparent containers, first and second catoptron, first and second filter and first and second polarizer; First, two post lens are conjugation geometric configuration, first, the focal line of two post lens overlaps with the main shaft of cylindrical transparent containers, first catoptron, first filter and first polarizer are positioned on the emitting light path of cylindrical transparent containers one end, according to first catoptron preceding, first filter is placed in the middle, the coaxial placement of order that first polarizer is last, second catoptron, second filter and second polarizer are positioned on the emitting light path of the cylindrical transparent containers other end, equally according to second catoptron preceding, second filter is placed in the middle, the coaxial placement of order that second polarizer is last is filled with medium in the cylindrical transparent containers; The pump light of two bundle incidents is in the post lens converge at medium in the cylindrical transparent containers, the four-photon resonance process takes place in medium, it is right to generate the opposite entangled photons of intensity equidirectional, contain the right light of entangled photons respectively from the two ends outgoing of cylindrical transparent container, and respectively after first and second catoptron is adjusted direction, select frequency through first and second filter again, and after first and second polarizer is selected polarization state, it is right finally to obtain entangled photons.
Described medium is atom, molecule or nano structural material, its level structure satisfies specific quantum leap selection rule, the four-photon resonance process can take place, and for example atom can be elements such as He, Be, Ne, Ar, Ca, Zn, Kr, Sr, Cd, Xe, Ba, Hg.
The concrete course of work of the present invention is as follows: two bundle incident intensities are I
1, I
2, frequency is ω
1, ω
2Pump light, its frequency satisfies
(
Be Planck's constant), post lens by the conjugation geometric configuration converge on the medium, the stimulated radiation condition is provided, the four-photon resonance process can take place in medium, and it is right to give off the opposite entangled photons of direction, the four-photon resonance process is meant that two photon transition (satisfying the selection rule of specific quantum leap) takes place in the microphysics system under the excitation of pump light, from ground state E
1To excited state E
2, give off frequency then and be
Entangled photons right.The right emissivity of entangled photons is proportional to the product of two bundle incident pump light intensities, and further be proportional to the product of intensity of two entangled photons of generation, not only can improve the right generation rate of entangled photons by regulating the incident light intensity like this, the condition of the right stimulated radiation of entangled photons can also be provided.Utilize the laser phase control technology, can control the phase place of two bundle incident lights, the laser that can use two bundle varying strengths and frequency like this is as pump light source, to make full use of the resonance state between ground state and the excited state, more medium can be utilized, regulate by catoptron from the direction of light of cylindrical transparent container two ends outgoing, and filter bias light by filter, polarizer, it is right just can to obtain required entangled photons.
The present invention has four obvious advantages: (1) uses the physical system (atom that satisfies specific selection rule, molecule or nano-device) the middle four-photon resonance process that takes place, the entangled photons that can make generation not be to must passing through dispersive medium, thereby avoided being unfavorable for the additive effect of entangled photons to practical application; (2) in the conjugation geometry arrangement, adopt the laser phase control technology to control the phase place of two bundle incident lights, the pump light of varying strength and frequency can be utilized on the one hand, on the other hand, the light quantum attitude factor can be controlled, improve the high-order process efficiency, make full use of medium; (3) provide the stimulated radiation condition; (4) it is right to adopt the polarization filtering device to select entangled photons.
Description of drawings
Fig. 1 four-photon resonance entangled photon pair generator structural representation
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated: present embodiment is being to implement under the prerequisite with the technical solution of the present invention, provided detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
As shown in Figure 1, the present embodiment four-photon resonance entangled photon pair generator comprises first and second post lens 8,9, cylindrical transparent containers 7, first and second catoptron 3,4, first and second filter 2,5 and first and second polarizer 1,6; First, two post lens 8, the 9th, the conjugation geometric configuration, first, two post lens 8,9 focal line overlaps with the main shaft of cylindrical transparent containers 7, first catoptron 3, first filter 2 and first polarizer 1, be positioned on the emitting light path of cylindrical transparent containers 7 one ends, according to first catoptron 3 preceding, first filter 2 is placed in the middle, the coaxial placement of order that first polarizer 1 is last, second catoptron 4, second filter 5 and second polarizer 6 are positioned on the emitting light path of cylindrical transparent containers 7 other ends, equally according to second catoptron 4 preceding, second filter 5 is placed in the middle, the coaxial placement of order that second polarizer 6 is last; Two bundle incident intensities are I
1, I
2, frequency is ω
1, ω
2The conjugation geometry that constitutes via first and second post lens 8,9 of pump light 10,11 converge in the medium in the cylindrical transparent containers 7, the stimulated radiation condition is provided, the four-photon resonance process takes place in medium, it is right to generate the opposite entangled photons of intensity equidirectional, described medium is rare gas Ne, its ground state level 2s
22p
61S
0With excited level 2s
22p
5(
2P °
3/2) 3p
2[1/2]
0Satisfy specific quantum and move selection rule more, the four-photon resonance process can take place, the generation wavelength is that the entangled photons of 1325 dusts is right, contain the right light of entangled photons from the 7 two ends outgoing of cylindrical transparent container, one brings out the light elder generation of penetrating after first catoptron 3 is adjusted directions, first filter 2 selects frequencies, first polarizer 1 to select polarization state, the light of other end outgoing by same principle earlier after second catoptron 4, second filter 5, second polarizer 6, finally obtain the paired photon that is in the quantum entanglement state, promptly entangled photons is right.
Claims (2)
1. four-photon resonance entangled photon pair generator comprises: first and second catoptron, and first and second filter is characterized in that, also comprises: first and second post lens, cylindrical transparent containers and first and second polarizer; The focal line of first and second post lens overlaps with the main shaft of cylindrical transparent containers, first catoptron, first filter and first polarizer are positioned on the emitting light path of cylindrical transparent containers one end,, first polarizer last order coaxial placement placed in the middle at preceding, first filter according to first catoptron, second catoptron, second filter and second polarizer are positioned on the emitting light path of the cylindrical transparent containers other end, equally according to second catoptron preceding, second filter placed in the middle, the last coaxial placement of order of second polarizer; The pump light of two bundle incidents is in the post lens converge at medium in the cylindrical transparent containers; The four-photon resonance process takes place in medium, it is right to generate the opposite entangled photons of intensity equidirectional, contain the right light of entangled photons respectively from the two ends outgoing of cylindrical transparent container, and respectively after first and second catoptron is adjusted direction, select frequency through first and second filter again, and after first and second polarizer is selected polarization state, it is right finally to obtain entangled photons;
The level structure of described medium satisfies specific quantum leap selection rule, and described medium is He, Be, Ne, Ar, Ca, Zn, Kr, Sr, Cd, Xe, Ba or the Hg that the four-photon resonance process can take place.
2. four-photon resonance entangled photon pair generator according to claim 1 is characterized in that, described first and second post lens are conjugation geometric configuration.
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| CNB2007100370403A CN100460975C (en) | 2007-02-01 | 2007-02-01 | Four-photon resonance entangled photon pairs generator |
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|---|---|---|---|
| CNB2007100370403A CN100460975C (en) | 2007-02-01 | 2007-02-01 | Four-photon resonance entangled photon pairs generator |
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| CN101013245A CN101013245A (en) | 2007-08-08 |
| CN100460975C true CN100460975C (en) | 2009-02-11 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102130418B (en) * | 2011-01-26 | 2013-07-17 | 清华大学 | Polarization-entangled quantum light source |
| CN102654716B (en) * | 2012-04-18 | 2014-06-25 | 苏州广泰量子科技有限公司 | Tangled photon source |
| CN111470577A (en) * | 2020-04-15 | 2020-07-31 | 苏州正奥水生态技术研究有限公司 | Sewage treatment photon carrier and preparation method and use method thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030133714A1 (en) * | 2002-01-06 | 2003-07-17 | Erann Gat | Communications method and apparatus using quantum entanglement |
| JP2004521374A (en) * | 2000-11-30 | 2004-07-15 | トラスティーズ オブ ボストン ユニバーシティ | Entangled high flux photon generation by a parametric process in a laser cavity |
| US20040208638A1 (en) * | 2002-05-07 | 2004-10-21 | Jansen David B. | Communication system using entangled photons |
| WO2005008953A1 (en) * | 2003-07-22 | 2005-01-27 | Elsag Spa | Device for the generation of entangled photons and their weighted distribution among four users |
| JP2006091171A (en) * | 2004-09-21 | 2006-04-06 | Nippon Telegr & Teleph Corp <Ntt> | Polarization entangled photon pair generating device |
| CN1866648A (en) * | 2006-06-19 | 2006-11-22 | 中国计量学院 | Apparatus for double wavelength output and photonic mixing to generate THz wave for semiconductor laser |
-
2007
- 2007-02-01 CN CNB2007100370403A patent/CN100460975C/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004521374A (en) * | 2000-11-30 | 2004-07-15 | トラスティーズ オブ ボストン ユニバーシティ | Entangled high flux photon generation by a parametric process in a laser cavity |
| US20030133714A1 (en) * | 2002-01-06 | 2003-07-17 | Erann Gat | Communications method and apparatus using quantum entanglement |
| US20040208638A1 (en) * | 2002-05-07 | 2004-10-21 | Jansen David B. | Communication system using entangled photons |
| WO2005008953A1 (en) * | 2003-07-22 | 2005-01-27 | Elsag Spa | Device for the generation of entangled photons and their weighted distribution among four users |
| JP2006091171A (en) * | 2004-09-21 | 2006-04-06 | Nippon Telegr & Teleph Corp <Ntt> | Polarization entangled photon pair generating device |
| CN1866648A (en) * | 2006-06-19 | 2006-11-22 | 中国计量学院 | Apparatus for double wavelength output and photonic mixing to generate THz wave for semiconductor laser |
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