本文關(guān)鍵詞：基于準(zhǔn)相位匹配晶體的非經(jīng)典光源的制備　出處：《中國(guó)科學(xué)技術(shù)大學(xué)》2016年博士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 光子對(duì) 準(zhǔn)相位匹配 自發(fā)參量下轉(zhuǎn)換 光學(xué)諧振腔 倍頻 單縱模 偏振糾纏 高階模 通信波段

【摘要】：無(wú)論是隱變量理論的否定還是EPR糾纏的證實(shí),無(wú)論是量子秘鑰分發(fā)還是量子隱形傳態(tài),非經(jīng)典量子光源都是極重要的實(shí)驗(yàn)對(duì)象。本論文圍繞光子和光子對(duì)的制備,開(kāi)展了一系列的工作�；跍�(zhǔn)相位匹配PPKTP晶體的參量下轉(zhuǎn)換過(guò)程,我們成功制備了紅外通信波段高質(zhì)量的偏振糾纏光源、腔增強(qiáng)高亮度的紅外以及可見(jiàn)窄線寬光子對(duì),此外,我們還在type-Ⅰ OPO中實(shí)現(xiàn)了模式可調(diào)的HG模窄線寬光子對(duì)。為了提供OPO腔的泵浦光源,我們還開(kāi)展了低泵浦功率下的高效率倍頻紫外激光研究。本論文的主要研究工作1.我們利用Sagnac干涉儀實(shí)現(xiàn)了偏振糾纏光子對(duì)的制備。我們用幾種方法證明了產(chǎn)生的光子對(duì)具有很好的質(zhì)量。雙光子Hong-Ou-Mandel干涉具有95.3%±1.6%的干涉可見(jiàn)度,光子帶寬2.4 nm。當(dāng)光子的中心波長(zhǎng)在20 nm內(nèi)變化時(shí),干涉可見(jiàn)度依然保持很高。雙光子45°基Bell干涉曲線具有96.4%±2.0%的干涉可見(jiàn)度,而且不隨溫度和泵浦光功率變化。測(cè)量的CHS H(Clauser-Horne-S himony-Holt)不等式的S參數(shù)是2.63±0.08,在8a內(nèi)違背不等式。對(duì)糾纏態(tài)的重構(gòu),我們得到的保真度為0.935±0.021。此外,產(chǎn)生的光子位于通信波段,而且是光纖輸出,非常適合與光纖系統(tǒng)結(jié)合,用于光纖量子通信領(lǐng)域。2.我們實(shí)現(xiàn)了低泵浦功率下高效率397.5 nm倍頻光的產(chǎn)生。我們工作的亮點(diǎn)是泵浦光(795 nm)的功率相對(duì)較低,僅110 mW,產(chǎn)生的藍(lán)光有49 mW,足夠去泵浦OPO腔產(chǎn)生光子對(duì)。產(chǎn)生的倍頻光具有很好的空間模式,裝置緊湊而穩(wěn)定。和常見(jiàn)的商用倍頻激光器相比,我們的倍頻系統(tǒng)在一些場(chǎng)合更具有優(yōu)勢(shì)。例如對(duì)于調(diào)諧范圍要求不高的地方如原子實(shí)驗(yàn)中,我們的系統(tǒng)可以省去昂貴復(fù)雜的激光放大器,直接用半導(dǎo)體激光器就能產(chǎn)生足夠的倍頻光。而且還可以利用半導(dǎo)體激光器的電流調(diào)制功能省去昂貴的電光調(diào)制器。此外,快速電流反饋也有助于提高系統(tǒng)的穩(wěn)定性。3.我們實(shí)現(xiàn)了腔內(nèi)Ⅱ型PPKTP晶體產(chǎn)生窄線寬光子對(duì)的實(shí)驗(yàn)。我們觀察到多縱模光子對(duì)的互相關(guān)函數(shù)具有非常明顯的梳狀結(jié)構(gòu),信噪比超過(guò)100：1。在使用濾波腔濾出單縱模時(shí),互相關(guān)函數(shù)的梳狀結(jié)構(gòu)消失,信噪比超過(guò)20：1,這證明了我們產(chǎn)生的是單縱模的窄線寬光子對(duì)。通過(guò)擬合,我們得到光子對(duì)的線寬為11.8 MHz,和原子的自然線寬在一個(gè)數(shù)量級(jí),而且光子對(duì)的中心波長(zhǎng)是780 nm,位于Rb原子躍遷的D2線,因此產(chǎn)生的光子可以與Rb原子系統(tǒng)結(jié)合,實(shí)現(xiàn)量子存儲(chǔ)和量子中繼。我們使用的泵浦光產(chǎn)生于單次通過(guò)倍頻實(shí)驗(yàn),功率只有幾百μW。在今后我們計(jì)劃將它換成腔內(nèi)倍頻方案,以便產(chǎn)生更強(qiáng)的泵浦光,這樣可以增大單縱模光子對(duì)的產(chǎn)生率,提高量子通信和量子存儲(chǔ)速率。4.我們實(shí)現(xiàn)了通信波段的窄帶明亮光子源。我們使用了一個(gè)三共振的OPO腔,這樣泵浦光也得到了增強(qiáng),因而產(chǎn)生的光子對(duì)的亮度相比雙共振情況有明顯的提高。我們得到的光子帶寬為8 MHz,相干時(shí)間為27.7 ns,亮度約為134±25s-1MHz-1mW-1。由于產(chǎn)生的光子位于通信波段,非常適合用于光纖系統(tǒng)中。如果將我們的光子源用高效率的全光纖器件實(shí)現(xiàn),那將會(huì)成為量子通信里一個(gè)實(shí)用化的模塊。5.我們希望能產(chǎn)生不同空間模式的光子對(duì),我們對(duì)這一目標(biāo)進(jìn)行了初步嘗試,我們先實(shí)現(xiàn)較容易的H G模光子的產(chǎn)生。我們將O P O腔鎖定在高階模上,就得到了H G模光子對(duì)。我們證明了產(chǎn)生的確實(shí)是非經(jīng)典關(guān)聯(lián)的光子對(duì)。兩種情況下HG模式光子的帶寬分別是11.4 MHz和20.8 MHz,與原子的自然線寬相當(dāng),波長(zhǎng)位于780 nm附近,可以與原子系統(tǒng)相結(jié)合,實(shí)現(xiàn)高維量子存儲(chǔ)。然后我們實(shí)現(xiàn)了一個(gè)模式簡(jiǎn)并消除腔,在這個(gè)腔中不同軌道角動(dòng)量的光束共振頻率不同,這樣不同軌道角動(dòng)量的光束之間不會(huì)由于簡(jiǎn)并而耦合,因此不需要非常理想的光學(xué)諧振腔就能使腔的本征模式是LG模。這為我們進(jìn)一步實(shí)現(xiàn)直接產(chǎn)生窄帶軌道角動(dòng)量光子對(duì)奠定了基礎(chǔ)。本論文的主要特色和創(chuàng)新點(diǎn)1.我們系統(tǒng)地研究了基于準(zhǔn)相位匹配晶體的自發(fā)參量下轉(zhuǎn)換過(guò)程。從單次通過(guò)形式到腔增強(qiáng)形式,從可見(jiàn)波段到紅外波段,從直積態(tài)到偏振糾纏態(tài),從基模光子到高階空間模式光子。我們的工作全面而系統(tǒng),涵蓋了基于準(zhǔn)相位匹配晶體的自發(fā)參量下轉(zhuǎn)換過(guò)程的大部分情況。2.我們實(shí)現(xiàn)了通信波段偏振糾纏源的制備,糾纏光子具有很高的保真度和亮度,頻譜特性很好,非常適用于量子通信領(lǐng)域。3.我們完成了單模窄線寬光子源的制備。從倍頻光的產(chǎn)生,到多縱模光子對(duì)的制備,再到雙共振單縱模光子對(duì)的制備,最后到三共振單縱模光子對(duì)的制備。我們的工作由淺入深,由易到難,系統(tǒng)而全面地研究了單縱模窄線寬光子源的制備。4.我們實(shí)現(xiàn)了多縱模窄線寬HG模光子對(duì)的直接產(chǎn)生。不同于以往將基模光子變換到高階模的方法,我們產(chǎn)生光子對(duì)的方法可以保持很高的保真度,這在某些對(duì)保真度要求嚴(yán)格的場(chǎng)合是非常有用的。
[Abstract]:Whether it is the negation of the hidden variable theory or EPR entanglement confirmed that both quantum key distribution and quantum teleportation, quantum non classical light source is very important. The object of this dissertation focuses on the preparation of photon and photon, launched a series of work. The conversion process parameters of quasi phase matched PPKTP crystal under based on the success of our system of high quality light polarization entangled in infrared communication wavelengths by cavity enhanced infrared high brightness and narrow linewidth of visible photons, in addition, we still type- I realized in OPO HG mode tunable narrow linewidth of photon mode. In order to provide OPO cavity pump source, we also carry out efficient study on low frequency ultraviolet laser pump power. The main research work of this paper we use 1. Sagnac interferometer to achieve a system of polarization entangled photon. We prove that the light produced by several methods The quality is very good to have. The two photon Hong-Ou-Mandel interference visibility with 95.3% + 1.6%, 2.4 nm. bandwidth when the center wavelength of the photon photon changes within 20 nm when the interference visibility remained at very high. Two photon interference visibility 45 degrees based Bell interference curve with 96.4% + 2%, but not with temperature and the pump power changes. Measurement of CHS H (Clauser-Horne-S himony-Holt) S 2.63 + 0.08 parameter inequality is violated, inequality in 8A. The reconstruction of the entangled state, we obtain the fidelity of 0.935 + 0.021. in addition, the resulting photons in a communication band, and is very suitable for optical fiber output, combined with the optical fiber system for quantum communication field.2. we achieve low pump power efficiency of 397.5 nm frequency light. Our work is the highlight of the pump (795 nm) power is relatively low, only 110 mW, the blue Light is 49 mW, enough to produce photon pumped OPO cavity. The frequency doubling light has good spatial pattern, compact and stable. Compared with common commercial laser frequency system, we have an advantage more in some occasions. For example, the tuning range of the high requirements such as atomic experiments, we the system can save the expensive and complex laser amplifier, direct use of semiconductor laser can produce harmonic light enough. But also by the electro-optic modulator current modulated semiconductor laser without expensive function. In addition, the fast current feedback also helps to improve the stability of the.3. system we implemented cavity type II PPKTP crystal on the experiment Zhai Xiankuan photon. We observed the multi longitudinal mode of the photon correlation function has a comb like structure is very obvious, the signal-to-noise ratio of more than 100:1. in the use of filter cavity filter A single longitudinal mode, disappear comb structure cross-correlation function, the signal-to-noise ratio of more than 20:1, which proves that we are generating a single longitudinal mode and narrow linewidth photon pairs. By fitting, we get to the 11.8 MHz linewidth of photon and atom, the natural linewidth of an order of magnitude, and the center wavelength of the photon is 780 nm, is located in the transition of Rb D2 line, the resulting photons can be combined with the Rb atom system, quantum storage and quantum repeater. We use the pump to produce a single pass frequency doubling experiment, power is only a few hundred W. in the future we plan to change it into the introcavity frequency doubling, so that the pump have stronger, so they can produce on the rate of increase of single longitudinal mode photon, improve the quantum communication and quantum storage rate.4. we achieve narrowband communication band bright photon source. We use a three OPO cavity resonance, this kind of pump is Has been enhanced, compared to the brightness of the resulting double photon resonance is significantly improved. We obtained 8 photon bandwidth MHz, coherent time is 27.7 ns, the brightness is about 134 25s-1MHz-1mW-1. due to the photon in the communication band, is very suitable for the optical fiber system. If we use the photon source all fiber device of high-efficiency, it will become a practical quantum communication module.5. we hope to produce different spatial patterns of the photon, we conducted a preliminary attempt to achieve this goal, we first H G mode photon is easy to produce. We will O P O in the high order mode locking cavity that got H G mode photon pairs. We prove that the resulting is non classical correlated photon pairs. Two photon HG model under the condition of bandwidth are 11.4 MHz and 20.8 MHz, and a natural linewidth of atomic wave. Long at around 780 nm, can be combined with atomic system, realize high dimensional quantum storage. Then we implement a simple model and eliminate the cavity resonance frequency of different beam, different orbital angular momentum in the cavity, so that light beams of different orbital angular momentum is not due to degenerate and coupling, so there is no need to light the resonant cavity can be very ideal that intrinsic mode cavity is LG mode. It is further our implementation directly from the orbital angular momentum of photons on the narrow band of the foundation. The main features and innovations of the thesis 1. we systematically study the quasi phase matched crystal spontaneous parametric down conversion process based on enhanced form from a single. Through the form to the cavity, from visible to infrared wavelengths, from the product state of polarization entangled state, from the base to the high order mode photon space mode photon. Our work comprehensively and systematically, including based on quasi phase The conversion process of spontaneous parametric matching crystals under the most.2. we realized communication band polarization entangled source for the preparation of entangled photons with high fidelity and brightness, spectrum characteristic is very good, very suitable for the field of quantum communication.3. we finished the single-mode narrow linewidth light source. The preparation of the second harmonic wave generated from on the system, the multi longitudinal mode photon preparation, then to the system of double resonance single longitudinal mode photon preparation, and finally to the system of the three resonance single longitudinal mode photon. We work from the shallower to the deeper, from easy to difficult, systematic and comprehensive research of single longitudinal mode narrow linewidth photon source preparation.4. we implement a multi longitudinal mode narrow linewidth HG mode photon to produce the direct. Different from the fundamental mode of photonic transform to high order modes, we produce photon pairs can maintain high fidelity, which is in some non strict occasions on the fidelity It's often useful.

【學(xué)位授予單位】：中國(guó)科學(xué)技術(shù)大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2016
【分類號(hào)】：O43

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