CN106353948A - Non-linear optical crystal and application method thereof - Google Patents
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- 239000013078 crystal Substances 0.000 title claims abstract description 93
- 238000000034 method Methods 0.000 title claims abstract description 32
- 230000003287 optical effect Effects 0.000 title claims abstract description 26
- 229910052701 rubidium Inorganic materials 0.000 claims abstract description 9
- 229910052792 caesium Inorganic materials 0.000 claims abstract description 8
- 229910052700 potassium Inorganic materials 0.000 claims abstract description 8
- 239000000126 substance Substances 0.000 claims description 9
- 238000010586 diagram Methods 0.000 description 9
- 238000005086 pumping Methods 0.000 description 7
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- DJHGAFSJWGLOIV-UHFFFAOYSA-K Arsenate3- Chemical compound [O-][As]([O-])([O-])=O DJHGAFSJWGLOIV-UHFFFAOYSA-K 0.000 description 3
- 229940000489 arsenate Drugs 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000010365 information processing Effects 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- IGLNJRXAVVLDKE-UHFFFAOYSA-N rubidium atom Chemical compound [Rb] IGLNJRXAVVLDKE-UHFFFAOYSA-N 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 230000002269 spontaneous effect Effects 0.000 description 2
- 241000282414 Homo sapiens Species 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- TVFDJXOCXUVLDH-UHFFFAOYSA-N caesium atom Chemical compound [Cs] TVFDJXOCXUVLDH-UHFFFAOYSA-N 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000010606 normalization Methods 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000005610 quantum mechanics Effects 0.000 description 1
- 239000013598 vector Substances 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
- G02F1/35—Non-linear optics
- G02F1/355—Non-linear optics characterised by the materials used
- G02F1/3551—Crystals
- G02F1/3553—Crystals having the formula MTiOYO4, where M=K, Rb, TI, NH4 or Cs and Y=P or As, e.g. KTP
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/002—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of materials engineered to provide properties not available in nature, e.g. metamaterials
- G02B1/005—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of materials engineered to provide properties not available in nature, e.g. metamaterials made of photonic crystals or photonic band gap materials
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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
- G02F1/35—Non-linear optics
- G02F1/3526—Non-linear optics using two-photon emission or absorption processes
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- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
本发明公开了一种非线性光学晶体及其应用方法。其中，所述晶体的通式为MTiOXO4；其中，M为K、Rb或Cs，X为P或As；所述晶体用来制备频域上纯态高于0.8的光子对。具体地，将波长范围为650nm到1050nm的泵浦光照射在所述晶体上。由于该晶体的双折射性质使得该晶体在该波长范围内满足特定的群速度匹配关系，因而其可制备出频域上是纯态的光子对。此外，由于本发明不需要像现有方法那样使用带通滤波片对信号光和闲置光做频域的过滤，因而本发明不仅制备简单，而且能量损耗小，从而保证了光源亮度。The invention discloses a nonlinear optical crystal and an application method thereof. Wherein, the general formula of the crystal is MTiOXO 4 ; wherein, M is K, Rb or Cs, and X is P or As; the crystal is used to prepare photon pairs whose pure state is higher than 0.8 in the frequency domain. Specifically, pump light with a wavelength ranging from 650 nm to 1050 nm is irradiated on the crystal. Due to the birefringence properties of the crystal, the crystal satisfies a specific group velocity matching relationship in the wavelength range, so it can produce photon pairs that are pure in the frequency domain. In addition, since the present invention does not need to use a band-pass filter to filter the signal light and idle light in the frequency domain as in the existing method, the present invention is not only simple to prepare, but also has low energy loss, thereby ensuring the brightness of the light source.
Description
技术领域technical field
本发明涉及光学技术领域，尤其涉及一种非线性光学晶体及其应用方法。The invention relates to the field of optical technology, in particular to a nonlinear optical crystal and an application method thereof.
背景技术Background technique
在20世纪末，人类步入了信息化社会，信息在人们的日常生活中，起着越来越重要的作用。量子信息是20世纪末期新生的量子力学与信息科学的交叉学科，同时也是21世纪最重要的战略研究领域之一，它有望为信息科技的持续发展开辟出新的原理和方法。量子信息的研究对象主要是量子态的制备与操作，包括量子通信、量子计算、量子成像、量子隐形传态、量子存储等。在量子信息的处理过程中，总离不开量子态及其演化过程。其中，单光子量子态是量子信息中最基本的量子态，其同时也是现代量子信息处理的基础和出发点。At the end of the 20th century, human beings have stepped into the information society, and information plays an increasingly important role in people's daily life. Quantum information is a newly born interdisciplinary subject of quantum mechanics and information science at the end of the 20th century. It is also one of the most important strategic research fields in the 21st century. It is expected to open up new principles and methods for the sustainable development of information technology. The research object of quantum information is mainly the preparation and operation of quantum states, including quantum communication, quantum computing, quantum imaging, quantum teleportation, quantum storage, etc. In the process of quantum information processing, the quantum state and its evolution process are always inseparable. Among them, the single-photon quantum state is the most basic quantum state in quantum information, and it is also the basis and starting point of modern quantum information processing.
目前，最常用的制备单光子量子态的方法是自发参量下的转换。在自发参量下的转化过程中，一个能量高的泵浦光会在非线性光学晶体中分裂成为两个能量低的信号光和闲置光(又被称为光子对，或双光子)。基于能量守恒原理和动量守恒原理，在通常情况下，信号光和闲置光在频率上是相关联的。但是在量子信息处理的很多应用中，很有必要将这种频率上的关联给消除掉。因为只有消除了这种频率上的关联，才能在量子干涉中获得高的干涉分辨率。当这种频率上的关联被消除掉的时候，双光态在频域上就是纯态。Currently, the most commonly used method for preparing single-photon quantum states is the conversion under spontaneous parameters. In the conversion process under spontaneous parameters, a high-energy pump light is split into two low-energy signal light and idler light (also called photon pair, or two-photon) in the nonlinear optical crystal. Based on the principles of energy conservation and momentum conservation, under normal circumstances, signal light and idle light are correlated in frequency. But in many applications of quantum information processing, it is necessary to eliminate this frequency correlation. Because only by eliminating the frequency correlation, high interference resolution can be obtained in quantum interference. When this frequency correlation is eliminated, the biphotonic state is a pure state in the frequency domain.
目前主要有两种方法消除这种频域上的关联：一种是使用带通滤波片对信号光和闲置光做频域的过滤，从而得到纯态。这种方法操作方便，但是能量损耗很大，会严重降低光源的亮度。另一种方法是设计特别参量下的转换过程，从而在转换过程中直接制备出频域上的纯态，不需要使用任何滤波片。At present, there are mainly two methods to eliminate this correlation in the frequency domain: one is to use a band-pass filter to filter the signal light and idle light in the frequency domain to obtain a pure state. This method is easy to operate, but consumes a lot of energy, which will seriously reduce the brightness of the light source. Another method is to design a conversion process under special parameters, so that pure states in the frequency domain are directly prepared during the conversion process without using any filters.
因此，如何在保证光源亮度的基础上，简单地制备出频域上是纯态的光子对是亟需解决的问题。Therefore, how to simply prepare photon pairs that are pure in the frequency domain on the basis of ensuring the brightness of the light source is an urgent problem to be solved.
发明内容Contents of the invention
本发明通过提供一种非线性光学晶体及其应用方法，实现了在保证光源亮度的基础上，简单地制备出频域上是纯态的光子对的技术效果。By providing a nonlinear optical crystal and an application method thereof, the invention achieves the technical effect of simply preparing photon pairs in a pure state in the frequency domain on the basis of ensuring the brightness of a light source.
本发明提供了一种非线性光学晶体，所述晶体的通式为MTiOXO4；其中，M为K、Rb或Cs，X为P或As；所述晶体用来制备频域上纯态高于0.8的光子对。The invention provides a nonlinear optical crystal, the general formula of the crystal is MTiOXO 4 ; wherein, M is K, Rb or Cs, X is P or As; the crystal is used to prepare a pure state higher than 0.8 photon pairs.
本发明提供的非线性光学晶体的应用方法，将波长范围为650nm到1050nm的泵浦光照射在上述晶体上。The application method of the nonlinear optical crystal provided by the present invention is to irradiate the above-mentioned crystal with pumping light with a wavelength range of 650nm to 1050nm.
进一步地，将波长范围为650nm到900nm的泵浦光照射在所述晶体上，所述晶体的化学式为PPRbTiOPO4。Further, pump light with a wavelength range of 650nm to 900nm is irradiated on the crystal, and the chemical formula of the crystal is PPRbTiOPO 4 .
进一步地，将波长为822nm的泵浦光照射在所述晶体上。Further, pump light with a wavelength of 822nm is irradiated on the crystal.
进一步地，将波长范围为650nm到850nm的泵浦光照射在所述晶体上，所述晶体的化学式为PPKTiOAsO4。Further, pumping light with a wavelength range of 650nm to 850nm is irradiated on the crystal, and the chemical formula of the crystal is PPKTiOAsO 4 .
进一步地，将波长为818nm的泵浦光照射在所述晶体上。Further, pump light with a wavelength of 818 nm is irradiated on the crystal.
进一步地，将波长范围为700nm到1000nm的泵浦光照射在所述晶体上，所述晶体的化学式为PPRbTiOAsO4。Further, pumping light with a wavelength range of 700nm to 1000nm is irradiated on the crystal, and the chemical formula of the crystal is PPRbTiOAsO 4 .
进一步地，将波长为893nm的泵浦光照射在所述晶体上。Further, pump light with a wavelength of 893 nm is irradiated on the crystal.
进一步地，将波长范围为750nm到1050nm的泵浦光照射在所述晶体上，所述晶体的化学式为PPCsTiOAsO4。Further, pumping light with a wavelength range of 750nm to 1050nm is irradiated on the crystal, and the chemical formula of the crystal is PPCsTiOAsO 4 .
进一步地，将波长范围为748nm到758nm的泵浦光照射在所述晶体上，所述晶体的化学式为PPCsTiOAsO4。Further, pumping light with a wavelength range of 748nm to 758nm is irradiated on the crystal, and the chemical formula of the crystal is PPCsTiOAsO 4 .
本发明中提供的一个或多个技术方案，至少具有如下技术效果或优点：One or more technical solutions provided in the present invention have at least the following technical effects or advantages:
将波长范围为650nm到1050nm的泵浦光照射在非线性光学晶体上，得到波长范围为1300nm到2100nm的光子对，且该晶体的通式为MTiOXO4。其中，M为K、Rb或Cs，X为P或As。由于该晶体的双折射性质使得该晶体在该波长范围内满足特定的群速度匹配关系，因而其可制备出频域上是纯态的光子对。此外，由于本发明不需要像现有方法那样使用带通滤波片对信号光和闲置光做频域的过滤，因而本发明不仅制备简单，而且能量损耗小，从而保证了光源亮度。The pumping light with a wavelength range of 650nm to 1050nm is irradiated on the nonlinear optical crystal to obtain photon pairs with a wavelength range of 1300nm to 2100nm, and the general formula of the crystal is MTiOXO 4 . Wherein, M is K, Rb or Cs, and X is P or As. Due to the birefringence properties of the crystal, the crystal satisfies a specific group velocity matching relationship in the wavelength range, so it can produce photon pairs that are pure in the frequency domain. In addition, since the present invention does not need to use a band-pass filter to filter the signal light and idle light in the frequency domain as in the existing method, the present invention is not only simple to prepare, but also has low energy loss, thereby ensuring the brightness of the light source.
附图说明Description of drawings
图1是晶体PPRbTiOPO4在其群速度匹配波长上的振幅分布图；Figure 1 is the amplitude distribution diagram of crystal PPRbTiOPO 4 at its group velocity matching wavelength;
图2是晶体PPRbTiOPO4在其群速度匹配波长上的强度分布图；Figure 2 is the intensity distribution diagram of crystal PPRbTiOPO 4 at its group velocity matching wavelength;
图3是晶体PPKTiOAsO4在其群速度匹配波长上的振幅分布图；Figure 3 is the amplitude distribution diagram of crystal PPKTiOAsO 4 at its group velocity matching wavelength;
图4是晶体PPKTiOAsO4在其群速度匹配波长上的强度分布图；Figure 4 is the intensity distribution diagram of crystal PPKTiOAsO 4 at its group velocity matching wavelength;
图5是晶体PPRbTiOAsO4在其群速度匹配波长上的振幅分布图；Figure 5 is the amplitude distribution diagram of crystal PPRbTiOAsO 4 at its group velocity matching wavelength;
图6是晶体PPRbTiOAsO4在其群速度匹配波长上的强度分布图；Figure 6 is the intensity distribution diagram of crystal PPRbTiOAsO 4 at its group velocity matching wavelength;
图7是晶体PPCsTiOAsO4在其群速度匹配波长上的振幅分布图；Fig. 7 is a diagram of the amplitude distribution of crystal PPCsTiOAsO 4 at its group velocity matching wavelength;
图8是晶体PPCsTiOAsO4在其群速度匹配波长上的强度分布图；Figure 8 is the intensity distribution diagram of crystal PPCsTiOAsO 4 at its group velocity matching wavelength;
图9是晶体PPCsTiOAsO4在1506nm的振幅分布图；Fig. 9 is the amplitude distribution figure of crystal PPCsTiOAsO 4 at 1506nm;
图10是晶体PPCsTiOAsO4在1506nm的强度分布图。Fig. 10 is the intensity distribution diagram of crystal PPCsTiOAsO 4 at 1506nm.
具体实施方式detailed description
本发明实施例通过提供一种非线性光学晶体及其应用方法，实现了在保证光源亮度的基础上，简单地制备出频域上是纯态的光子对的技术效果。The embodiments of the present invention provide a nonlinear optical crystal and an application method thereof, thereby achieving the technical effect of simply preparing photon pairs in a pure state in the frequency domain on the basis of ensuring the brightness of a light source.
本发明实施例中的技术方案为解决上述技术问题，总体思路如下：The technical solution in the embodiment of the present invention is to solve the above-mentioned technical problems, and the general idea is as follows:
将波长范围为650nm到1050nm的泵浦光照射在非线性光学晶体上，得到波长范围为1300nm到2100nm的光子对，且该晶体的通式为MTiOXO4。其中，M为K、Rb或Cs，X为P或As。由于该晶体的双折射性质使得该晶体在该波长范围内满足特定的群速度匹配关系，因而其可制备出频域上是纯态的光子对。此外，由于本发明实施例不需要像现有方法那样使用带通滤波片对信号光和闲置光做频域的过滤，因而本发明实施例不仅制备简单，而且能量损耗小，从而保证了光源亮度。The pumping light with a wavelength range of 650nm to 1050nm is irradiated on the nonlinear optical crystal to obtain photon pairs with a wavelength range of 1300nm to 2100nm, and the general formula of the crystal is MTiOXO 4 . Wherein, M is K, Rb or Cs, and X is P or As. Due to the birefringence properties of the crystal, the crystal satisfies a specific group velocity matching relationship in the wavelength range, so it can produce photon pairs that are pure in the frequency domain. In addition, since the embodiment of the present invention does not need to use a bandpass filter to filter the signal light and idle light in the frequency domain as in the existing method, the embodiment of the present invention is not only simple to prepare, but also has low energy loss, thereby ensuring the brightness of the light source .
为了更好地理解上述技术方案，下面将结合说明书附图以及具体的实施方式对上述技术方案进行详细的说明。In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.
本发明实施例提供的非线性光学晶体的通式为MTiOXO4；其中，M为K、Rb或Cs，X为P或As。该晶体用来制备频域上纯态高于0.8的光子对。The general formula of the nonlinear optical crystal provided by the embodiment of the present invention is MTiOXO 4 ; wherein, M is K, Rb or Cs, and X is P or As. The crystal is used to prepare photon pairs whose pure state is higher than 0.8 in the frequency domain.
本发明实施例提供的非线性光学晶体的应用方法，将波长范围为650nm到1050nm的泵浦光照射在上述晶体上，得到波长范围为1300nm到2100nm的光子对。In the application method of the nonlinear optical crystal provided by the embodiment of the present invention, pump light with a wavelength range of 650nm to 1050nm is irradiated on the crystal to obtain photon pairs with a wavelength range of 1300nm to 2100nm.
具体地，本发明实施例提供的晶体包括PPRbTiOPO4(周期性极化磷酸氧钛铷)、PPKTiOAsO4(周期性极化砷酸钛氧钾)、PPRbTiOAsO4(周期性极化砷酸氧钛铷)和PPCsTiOAsO4(周期性极化砷酸钛氧铯)，且这四种晶体都能满足群速度匹配条件：其中，分别是泵浦光，信号光和闲置光的群速度的倒数，λ是信号光与闲置光的波长(即信号光的波长与闲置光的波长一样)，该波长是泵浦光波长的2倍。在满足群速度匹配条件之后，可以在这些晶体中制备出纯度大于0.8的频域高度无关联的纯态。Specifically, the crystals provided by the embodiments of the present invention include PPRbTiOPO 4 (periodically poled rubidium titanyl phosphate), PPKTiOAsO 4 (periodically poled potassium titanyl arsenate), PPRbTiOAsO 4 (periodically poled rubidium titanyl arsenate) ) and PPCsTiOAsO 4 (periodically poled cesium titanyl arsenate), and these four crystals can satisfy the group velocity matching condition: in, are the reciprocals of the group velocities of the pump light, the signal light and the idle light, respectively, and λ is the wavelength of the signal light and the idle light (that is, the wavelength of the signal light is the same as that of the idle light), which is twice the wavelength of the pump light . After satisfying the group velocity matching condition, highly uncorrelated pure states in the frequency domain with a purity greater than 0.8 can be prepared in these crystals.
在本实施例中，PPRbTiOPO4用PPRTP表示,PPKTiOAsO4用PPKTA表示,PPRbTiOAsO4用PPRTA表示,PPCsTiOAsO4用PPCTA表示。In this embodiment, PPRbTiOPO 4 is represented by PPRTP, PPKTiOAsO 4 is represented by PPKTA, PPRbTiOAsO 4 is represented by PPRTA, and PPCsTiOAsO 4 is represented by PPCTA.
当上述非线性光学晶体是PPRbTiOPO4时，将波长范围为650nm到900nm的泵浦光照射在晶体上，得到波长范围为1300nm到1800nm的光子对。When the above-mentioned nonlinear optical crystal is PPRbTiOPO 4 , the pump light with a wavelength range of 650nm to 900nm is irradiated on the crystal to obtain photon pairs with a wavelength range of 1300nm to 1800nm.
参见图1和图2，为了获得纯度更高的光子对，将波长为822nm的泵浦光照射在晶体上，得到波长为1643nm的光子对。这里需要说明的是，根据振幅分布，即信号光和闲置光的联合频谱分布可以计算得到纯度。具体地，信号光和闲置光的联合频谱分布矩阵用f(ωs,ωi)表示。其中，ωs,ωi分别表示信号光和闲置光的频率。对该矩阵做施密特分解，得到其中，是频域的两组正交基矢，被成为施密特模，cj是一组非负的实数，满足归一化条件纯度p可以从下面的公式中计算得到 Referring to Figure 1 and Figure 2, in order to obtain photon pairs with higher purity, pump light with a wavelength of 822nm is irradiated on the crystal to obtain photon pairs with a wavelength of 1643nm. It should be noted here that the purity can be calculated according to the amplitude distribution, that is, the joint spectrum distribution of the signal light and the idle light. Specifically, the joint spectrum distribution matrix of signal light and idle light is represented by f(ω s ,ω i ). Among them, ω s , ω i represent the frequencies of signal light and idle light, respectively. Schmidt decomposition of this matrix, we get in, are two sets of orthogonal basis vectors in the frequency domain, which are called Schmidt models, and c j is a set of non-negative real numbers that satisfy the normalization condition The purity p can be calculated from the following formula
根据上述公式可以计算出光子对的纯度为0.82。According to the above formula, the purity of the photon pair can be calculated as 0.82.
参见图3和图4，当上述非线性光学晶体是PPKTiOAsO4时，将波长范围为650nm到850nm的泵浦光照射在晶体上，得到波长范围为1300nm到1700nm的光子对，且得到的光子对的纯度在0.8到0.82之间。具体地，将波长为818nm的泵浦光照射在晶体上，得到波长为1635nm的光子对。在这种情况下，光子对的纯度为0.82。Referring to Figure 3 and Figure 4, when the above-mentioned nonlinear optical crystal is PPKTiOAsO 4 , the pump light with a wavelength range of 650nm to 850nm is irradiated on the crystal to obtain photon pairs with a wavelength range of 1300nm to 1700nm, and the obtained photon pairs The purity is between 0.8 and 0.82. Specifically, pump light with a wavelength of 818nm is irradiated on the crystal to obtain photon pairs with a wavelength of 1635nm. In this case, the purity of the photon pair is 0.82.
参见图5和图6，当上述非线性光学晶体是PPRbTiOAsO4时，将波长范围为700nm到1000nm的泵浦光照射在晶体上，得到波长范围为1400nm到2000nm的光子对，且得到的光子对的纯度在0.8到0.82之间。具体地，将波长为893nm的泵浦光照射在晶体上，得到波长为1785nm的光子对。在这种情况下，光子对的纯度为0.82。Referring to Figure 5 and Figure 6, when the above-mentioned nonlinear optical crystal is PPRbTiOAsO 4 , the pump light with a wavelength range of 700nm to 1000nm is irradiated on the crystal to obtain photon pairs with a wavelength range of 1400nm to 2000nm, and the obtained photon pairs The purity is between 0.8 and 0.82. Specifically, pump light with a wavelength of 893nm is irradiated on the crystal to obtain photon pairs with a wavelength of 1785nm. In this case, the purity of the photon pair is 0.82.
参见图7和图8，当上述非线性光学晶体是PPCsTiOAsO4时，将波长范围为750nm到1050nm的泵浦光照射在晶体上，得到波长范围为1500nm到2100nm的光子对，且得到的光子对的纯度在0.8到0.82之间。具体地，将波长为843nm的泵浦光照射在晶体上，得到波长为1685nm的光子对。在这种情况下，光子对的纯度为0.82。Referring to Figure 7 and Figure 8, when the above-mentioned nonlinear optical crystal is PPCsTiOAsO 4 , the pump light with a wavelength range of 750nm to 1050nm is irradiated on the crystal to obtain photon pairs with a wavelength range of 1500nm to 2100nm, and the obtained photon pairs The purity is between 0.8 and 0.82. Specifically, pump light with a wavelength of 843 nm is irradiated on the crystal to obtain photon pairs with a wavelength of 1685 nm. In this case, the purity of the photon pair is 0.82.
这里需要说明的是，参见图9和图10，PPCsTiOAsO4还满足另外一个群速度匹配条件：且群速度匹配波长的范围为748nm到758nm，即将波长范围为748nm到758nm的泵浦光照射在晶体上，得到波长范围为1496nm到1516nm的光子对，且得到的光子对的纯度在0.9到0.97之间。具体地，将波长为753nm的泵浦光照射在晶体上，得到波长为1506nm的光子对。在这种情况下，光子对的纯度为0.97。It should be noted here that, referring to Fig. 9 and Fig. 10, PPCsTiOAsO 4 also satisfies another group velocity matching condition: And the group velocity matching wavelength range is 748nm to 758nm, that is, the pump light with a wavelength range of 748nm to 758nm is irradiated on the crystal to obtain photon pairs with a wavelength range of 1496nm to 1516nm, and the purity of the obtained photon pairs is 0.9 to 0.97 between. Specifically, pump light with a wavelength of 753nm is irradiated on the crystal to obtain photon pairs with a wavelength of 1506nm. In this case, the purity of the photon pair is 0.97.
【技术效果】【Technical effect】
1、将波长范围为650nm到1050nm的泵浦光照射在非线性光学晶体上，得到波长范围为1300nm到2100nm的光子对，且该晶体的通式为MTiOXO4。其中，M为K、Rb或Cs，X为P或As。由于该晶体的双折射性质使得该晶体在该波长范围内满足特定的群速度匹配关系，因而其可制备出频域上是纯态的光子对。此外，由于本发明实施例不需要像现有方法那样使用带通滤波片对信号光和闲置光做频域的过滤，因而本发明实施例不仅制备简单，而且能量损耗小，从而保证了光源亮度。1. Irradiate pump light with a wavelength range of 650nm to 1050nm on the nonlinear optical crystal to obtain photon pairs with a wavelength range of 1300nm to 2100nm, and the general formula of the crystal is MTiOXO 4 . Wherein, M is K, Rb or Cs, and X is P or As. Due to the birefringence properties of the crystal, the crystal satisfies a specific group velocity matching relationship in the wavelength range, so it can produce photon pairs that are pure in the frequency domain. In addition, since the embodiment of the present invention does not need to use a bandpass filter to filter the signal light and idle light in the frequency domain as in the existing method, the embodiment of the present invention is not only simple to prepare, but also has low energy loss, thereby ensuring the brightness of the light source .
2、在本发明实施例中，非线性光学晶体PPRbTiOPO4的调谐范围为650nm到900nm，非线性光学晶体PPKTiOAsO4的调谐范围为650nm到850nm，非线性光学晶体PPRbTiOAsO4的调谐范围为700nm到1000nm，非线性光学晶体PPCsTiOAsO4的调谐范围为750nm到1050nm，且制备出的光子对的纯度均在0.8以上，因此本发明实施例提供的四种非线性光学晶体制备的单光子源具有很广的调谐范围。2. In the embodiment of the present invention, the tuning range of the nonlinear optical crystal PPRbTiOAsO4 is 650nm to 900nm, the tuning range of the nonlinear optical crystal PPKTiOAsO4 is 650nm to 850nm, and the tuning range of the nonlinear optical crystal PPRbTiOAsO4 is 700nm to 1000nm , the tuning range of the nonlinear optical crystal PPCsTiOAsO 4 is 750nm to 1050nm, and the purity of the prepared photon pairs is above 0.8, so the single photon sources prepared by the four nonlinear optical crystals provided by the embodiments of the present invention have a wide range tuning range.
3、本发明实施例中的非线性光学晶体PPCsTiOAsO4可以在748nm到758nm的波长上满足另外一个群速度匹配条件：且在753nm时，可以产生纯度为0.97的纯态单光子源。3. The nonlinear optical crystal PPCsTiOAsO 4 in the embodiment of the present invention can satisfy another group velocity matching condition at a wavelength of 748nm to 758nm: And at 753nm, a pure-state single-photon source with a purity of 0.97 can be produced.
尽管已描述了本发明的优选实施例，但本领域内的技术人员一旦得知了基本创造性概念，则可对这些实施例作出另外的变更和修改。所以，所附权利要求意欲解释为包括优选实施例以及落入本发明范围的所有变更和修改。While preferred embodiments of the invention have been described, additional changes and modifications to these embodiments can be made by those skilled in the art once the basic inventive concept is appreciated. Therefore, it is intended that the appended claims be construed to cover the preferred embodiment as well as all changes and modifications which fall within the scope of the invention.
显然，本领域的技术人员可以对本发明进行各种改动和变型而不脱离本发明的精神和范围。这样，倘若本发明的这些修改和变型属于本发明权利要求及其等同技术的范围之内，则本发明也意图包含这些改动和变型在内。Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.
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