【摘要】：在量子信息科學(xué)研究中,比較理想的量子信息網(wǎng)絡(luò)系統(tǒng)是以光和原子分別作為量子信息的傳輸載體和存儲節(jié)點。由于1.5 μm波段不僅對應(yīng)著光纖的低色散窗口,同時更是最低損耗傳輸窗口,這些特性使得該波段的高質(zhì)量非經(jīng)典光源在基于光纖傳輸?shù)墓饫w通信系統(tǒng)中有著重要的應(yīng)用,也吸引了各個國家的眾多科研工作者進行這方面的研究。人們希望能夠制備高質(zhì)量的糾纏態(tài)光場,使其加載著信息在光纖中低損耗長距離地傳輸,并保持其量子特性盡量不受到破壞,有效地進行量子信息處理,從而促進量子信息技術(shù)的發(fā)展,實現(xiàn)量子信息和現(xiàn)有成熟的光纖通信的結(jié)合,最終推動量子信息系統(tǒng)的建立和發(fā)展。而開展這些研究工作需要以該波段的高質(zhì)量壓縮源為基礎(chǔ)。本學(xué)位論文圍繞連續(xù)變量1.5-tm光通信波段壓縮態(tài)光場的產(chǎn)生展開了一系列的理論和實驗研究,主要完成了以下幾方面的工作：(1)利用模清潔器降低光纖激光器輸出1.5μm激光的噪聲�；谀Ｇ鍧嵠骶哂心軌蛴行У剡^濾激光噪聲的特性,實驗上采用兩個模清潔器對光纖激光器輸出的1.5μ-m激光進行了二次過濾,透過效率均為80%,二級過濾后激光的強度噪聲在分析頻率3MHz處達(dá)到了散粒噪聲基準(zhǔn)。輸出的低噪聲1.5μm激光用作后續(xù)實驗倍頻過程的基頻光和壓縮態(tài)光場的平衡零拍探測系統(tǒng)的本底光。(2)利用高效率外腔諧振倍頻技術(shù),在實驗上獲得了連續(xù)單頻780nm激光,倍頻效率高達(dá)84.8%。采用前面制備的1.51μm激光作為基頻光、周期極化鈮酸鋰(PPLN)晶體作為非線性晶體,我們通過高效率倍頻過程得到了倍頻光,最大輸出功率達(dá)1W。為了滿足后續(xù)實驗中光學(xué)參量振蕩器對泵浦光低噪聲的要求,我們在倍頻腔后加入模清潔器來進一步改善激光的噪聲特性,透射激光的強度噪聲在分析頻率4MHz處達(dá)到了散粒噪聲基準(zhǔn),功率最大達(dá)700mW,透過效率為80%。(3)利用準(zhǔn)相位匹配晶體產(chǎn)生了1.51μm光通信波段的壓縮態(tài)光場。分析了影響光學(xué)參量振蕩過程產(chǎn)生壓縮態(tài)光場的因素,實驗上采用前面制備的低噪聲780nm單頻激光,通過閾值以下簡并光學(xué)參量振蕩器,在實驗上獲得了壓縮度達(dá)3dB的1.5μm壓縮真空態(tài)光場。
[Abstract]:In the research of quantum information science, the ideal quantum information network system is to use light and atom as the transmission carrier and storage node of quantum information, respectively. The 1.5 渭 m band not only corresponds to the low dispersion window of the optical fiber, but also the lowest loss transmission window. These characteristics make the high quality non-classical light source of the band have important applications in the optical fiber communication system based on the optical fiber transmission. It has also attracted a large number of researchers from various countries to carry out research in this area. People hope to be able to prepare high quality entangled state light field, so that it can load the information in the fiber and transmit it long distance at low loss, and keep its quantum properties intact as far as possible, so that the quantum information can be processed effectively. In order to promote the development of quantum information technology, realize the combination of quantum information and existing mature optical fiber communication, and finally promote the establishment and development of quantum information system. These studies need to be based on high-quality compression sources in this band. In this dissertation, a series of theoretical and experimental studies have been carried out on the generation of squeezed state light fields in continuous variable 1.5-tm optical communication band. The main works are as follows: (1) the noise of 1.5 渭 m laser output from the fiber laser is reduced by using the mode cleaner. Based on the characteristic that the mode cleaner can filter the laser noise effectively, two mode cleaners are used to filter the 1.5 渭 -m laser output from the fiber laser. The transmission efficiency is 80%. The intensity noise of the laser after two stage filtering has reached the standard of shot noise at the analytical frequency 3MHz. The output low noise 1.5 渭 m laser is used as the background light of the fundamental frequency light and the balanced zero-beat detection system of the squeezed state light field in the subsequent experimental frequency doubling process. (2) the continuous single-frequency 780nm laser is experimentally obtained by using the high-efficiency external cavity resonant frequency-doubling technique. The efficiency of frequency doubling is as high as 84.8. Using the 1. 51 渭 m laser as the fundamental frequency light and the periodically polarized lithium niobate (PPLN) crystal as the nonlinear crystal, we obtain the double frequency light through the high efficiency frequency doubling process. The maximum output power is 1 W. In order to meet the requirements of the optical parametric oscillator for the low noise of the pump light in the subsequent experiments, we add a mode cleaner behind the frequency doubling cavity to further improve the noise characteristics of the laser. The intensity noise of the transmission laser reaches the standard of granular noise at the analytical frequency 4MHz, the maximum power is 700mW, and the transmission efficiency is 80. (3) the squeezed light field in the optical communication band of 1. 51 渭 m is generated by using the quasi phase matching crystal. The factors influencing the squeezed optical field in the process of optical parametric oscillation are analyzed. In the experiment, the low noise 780nm single frequency laser is used in the experiment, and the degenerate optical parametric oscillator is obtained under the threshold. The 1. 5 渭 m squeezed vacuum light field with squeezing degree of 3dB has been obtained experimentally.
【學(xué)位授予單位】：山西大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN929.1

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