热原子系综中光场连续变量量子记忆

项目名称： 热原子系综中光场连续变量量子记忆

项目编号： No.11274211

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 数理科学和化学

项目作者： 李淑静

作者单位： 山西大学

项目金额： 80万元

中文摘要： 光场连续变量量子记忆是光与原子量子界面研究中的一个重要内容，近年来受到了人们的特别关注。本项目拟在热原子系综中开展光场连续变量量子态存储的实验研究。利用电磁感应透明效应和大失谐拉曼相互作用动力学过程将光场正交分量转化为原子自旋极化，存储在原子系综中；研究单光子失谐和耦合光光强对存储效率的影响；通过在原子系综中施加导向磁场，建立确定的量子化轴，减小因磁场起伏导致的原子记忆退相干，延长光场在热原子系综中的存储寿命；利用平衡零拍探测技术对恢复光场的正交分量进行测量，研究拉曼过程单光子失谐对光场正交分量起伏的影响；对恢复光场量子态进行重构，获得存储过程的保真度。本项目旨在探索利用装置相对简单的热原子系综进行光场量子态存储，为实用化的连续变量量子记忆装置提供基础。

中文关键词： 量子存储；原子系综；连续变量；正交分量；保真度

英文摘要： The quantum memory of continuous variable light field is one of the important content in the research of the quantum interface between the light and atom, it is paid particular attention in recent years. This project plans to carry out the experimental investigation on quantum state storage of continuous variable light field in hot atomic ensemble. By using the dynamic process of electromagnetically induced transparency (EIT) effect and far off-resonance Raman interaction the quadrature components of light field are mapped into atomic spin polarizations and stored in atomic ensemble. We will investigate the dependence of storage efficiency on the single-photon detuning and the intensity of coupling light; By applying a guiding magnetic the quantization axis of interaction between light and atom is established to decrease the decoherence of atomic memory caused by magnetic fluctuations and prolong the storage life. We will use balanced homodyne detection to measure the quadrature components of revived light field, and research the influence of single-photon detuning in Raman interaction on noise of quadrature components; The fidelity of storage process is acquired by reconstructing the quantum state of revived light field. The goal of the project is to explore the optical quantum state memory in relative simple

英文关键词： quantum memory；atomic ensemble；continuous variable；quadrature components；fidelity