基于四波混频的空间复用产生多模量子关联

发布时间：2018-01-19 06:33

本文关键词： 多组份纠缠与关联四波混频空间复用强度差压缩空间多模锥形泵浦光　出处：《华东师范大学》2017年博士论文　论文类型：学位论文

【摘要】：近年来,随着量子通讯与量子信息处理的迅猛发展,促使人们对量子系统中关联的研究越来越深入。量子关联与纠缠具有非局域性,可以存在于相隔很遥远且没有相互作用的体系之间。量子关联与纠缠的这一特性使其成为一种非经典的重要资源,在量子通讯与量子信息处理方面有着重要的意义。本论文将用四个章节的内容从以下四个方面介绍我博士期间利用四波混频的空间复用产生多模量子关联所做的工作:一,产生多组份量子关联光束对量子通讯和量子网络工程有着重要的意义。我们以半导体激光器为光源,在铷原子蒸汽池中,利用四波混频的空间复用产生了四组份量子关联光束。根据我们提出的这种方案,不仅可以使产生的量子关联光束的数量以指数形式(2",n是铷池的数量)增加,而且量子关联随着量子关联光束的数量增加而增强。我们在实验上验证了n=2时,利用四波混频的空间复用产生了四组份量子关联光束,并测到量子关联(强度差压缩)从单个铷池时的-5.6dB 和-6.5dB 增强到-8.2dB。二,多组份量子关联光束之间量子关联的强弱直接影响其在量子通讯和量子信息处理等方面的应用。量子关联的强弱受系统中不同参数的影响,我们通过对系统中的主要参数的调节,如:改变单光子失谐,双光子失谐,铷池温度,泵浦光功率以及增益等参数,深入研究了四光以及两两之间的量子关联随增益的变化,从而找到了系统产生最强量子关联的参数范围。三,多模量子关联对量子信息处理以及量子通讯有重要的应用价值。我们利用四波混频的空间复用并用"锥形泵浦光+高斯模式的探针光"的光学系统产生了锥形的共轭光,并在实验上测到沿轴向的探针光与锥形共轭光之间的量子关联(强度差压缩)约为-3.8 dB。实验中还研究了量子关联的多模特性以及量子关联随参数的变化。四,实验上利用四波混频的空间复用并用"锥形泵浦光+锥形探针光"的光学系统产生了锥形的探针光和锥形的共轭光,并在测到锥形探针光与锥形共轭光之间的量子关联(强度差压缩)约为-2.6 dB。实验中还研究了量子关联的多模特性以及量子关联随参数的变化。
[Abstract]:In recent years, with the rapid development of quantum communication and quantum information processing, the research on correlation in quantum system is more and more in-depth. Quantum correlation and entanglement are nonlocal. Quantum correlation and entanglement make it a non-classical resource. This paper will use four chapters to introduce the multimode quantum correlation generated by spatial multiplexing of four-wave mixing during my Ph.D.'s period, which is of great significance in the field of quantum communication and quantum information processing. Work:. One. The generation of multicomponent quantum correlation beams is of great significance for quantum communication and quantum network engineering. We use semiconductor lasers as light sources in rubidium vapor cells. A four-component quantum correlation beam is produced by spatial multiplexing of four-wave mixing. According to the proposed scheme, not only the number of quantum correlation beams produced can be exponentially formed by 2 ". N is the number of rubidium cells) and the quantum correlation increases as the number of quantum correlation beams increases. We have experimentally verified that n = 2:00. A four-component quantum correlation beam is generated by spatial multiplexing of four-wave mixing. The quantum correlation (intensity difference squeezing) was increased from -5.6dB and -6.5dB in a single rubidium cell to -8.2dB.2. The intensity of quantum correlation between multicomponent quantum correlation beams directly affects its applications in quantum communication and quantum information processing. The intensity of quantum correlation is affected by different parameters in the system. We adjust the main parameters of the system, such as single photon detuning, two-photon detuning, rubidium cell temperature, pump power and gain. In this paper, the variation of quantum correlation between the four light and its pairings with gain is studied in depth, and the parameter range of the strongest quantum correlation is found. 3. Multimode quantum correlation has important application value for quantum information processing and quantum communication. We use spatial multiplexing of four-wave mixing and "probe light in Gao Si mode of tapered pump light". The optical system produces conical conjugate light. The quantum correlation between the probe light and the conical conjugate light along the axis has been measured experimentally (intensity difference squeezing). The multimode properties of quantum correlation and the variation of quantum correlation with parameters are also studied in the experiment. 4. In the experiment, the conical probe light and conical conjugate light are generated by using the spatial multiplexing of four-wave mixing and the optical system of "tapered pump light conical probe light". The quantum correlation (intensity difference squeezing) between the conical probe light and the conical conjugate light is about -2.6 dB. The multimode properties of the quantum correlation and the variation of the quantum correlation with the parameters are also studied in the experiment.
【学位授予单位】：华东师范大学
【学位级别】：博士
【学位授予年份】：2017
【分类号】：O413

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