光波导参量振荡压缩器

项目名称： 光波导参量振荡压缩器

项目编号： No.61205115

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 信息四处

项目作者： 王东

作者单位： 安徽工业大学

项目金额： 29万元

中文摘要： 压缩态光场是连续变量量子信息的重要载体。光学参量振荡器被证明是产生压缩态光场的有效工具，但是由于非线性晶体中的光斑不能太小，晶体也不能太长，要求有较大的泵浦功率。利用光波导可以缩小光斑尺寸，增强非线性相互作用，从而降低泵浦功率。本项目拟对光波导参量振荡压缩器展开研究。为了使问题简单化，本项目只针对利用离子交换或激光直写技术在周期极化KTP晶体上形成的波导，在分析导模空间场分布的基础之上，定量分析波导内的额外噪声和非线性耦合效率，然后在此光波导两端加适当反射率的腔镜或镀膜，最终建立此光波导参量振荡器的理论分析方法，并实现可以输出压缩真空态、正交振幅压缩态和正交位相压缩态的低功耗光波导参量振荡压缩器。光波导参量振荡压缩器的输出光可以利用各种成熟的光纤光学技术，构建量子通讯网络。同时光波导压缩器也容易集成到芯片上，进行量子信息处理。本项目的研究也将为实现其他类型的光波导压缩器件奠定基础。

中文关键词： 波导；非线性；模场分布；超透射；纠缠态

英文摘要： The light field of squeezed state is the important carrier of continuous variable quantum information. Optical parametric oscillator（OPO）has been proved to be an effective tool to generate light in a squeezed sate. But the light spot in the nonlinear crystal can't be too small and the length of the crystal also can't be too long. This requires a large pump power. However, optical waveguide can narrow the spot size, enhance nonlinear interaction, and thereby reduce the pump power. This project intends to study the waveguide parametric oscillation squeezer. To simplify the problems, we only study the waveguide in PPKTP crystal, which is produced by ion exchange or laser direct writing technology. On the basis of the analysis of waveguide mode field distributions, the additional noise and nonlinear coupling efficiency will be analyzed quantitatively. Then adding two reflectors or coating at the two sides of the waveguide, forms an OPO. Through building Lengevin equations and theoretical analysis, low power dissipation OPO squeezer is finally expected to obtain in the experiment, which can output the light fields of squeezed vacuum state, quadrature phase and amplitude squeezed state. Light from waveguide OPO can use a variety of mature fiber optics technology and construct quantum communication network. Also OPO sq

英文关键词： waveguide；nonlinear；mode field distribution；extraordinary optical transmission；entanglement sate