基于电磁诱导透明机制的压缩光场量子存储

发布时间：2018-05-31 06:40

本文选题：量子存储 + 压缩热态光场　；参考：《物理学报》2017年07期

【摘要】：光场的量子存储不仅是构建量子计算机的重要基础,而且是实现量子中继和远距离量子通信的核心部分.由于存在不可避免的光学损耗,光学参量放大器产生的压缩真空态光场将变为压缩热态光场,不再是最小不确定态.因此,压缩热态光场的量子存储是实现量子互联网的关键.在原子系综中利用电磁诱导透明机制能够实现量子态在光场正交分量和原子自旋波之间的相互映射,即受控量子存储.本文根据量子存储的保真度边界,研究了实现压缩热态光场量子存储的条件.量子存储的保真度边界是通过经典手段能够达到的最大保真度,当保真度大于该边界时,就实现了量子存储.通过数值计算分析了不同情况下压缩热态光场的量子存储保真度边界,以及存储保真度随存储效率的变化关系,得到了实现量子存储的条件,为连续变量量子存储实验设计提供了直接参考.
[Abstract]:The quantum storage of optical field is not only the important foundation of constructing quantum computer, but also the core part of quantum relay and long-distance quantum communication. Due to the inevitable optical loss, the squeezed vacuum light field produced by the optical parametric amplifier will be changed into the squeezed hot state light field, which is no longer the least uncertain state. Therefore, the quantum storage of squeezed thermal light field is the key to realize quantum Internet. In atomic ensemble, the electromagnetic induced transparency mechanism can be used to realize the mutual mapping of quantum states between the orthogonal components of the light field and the atomic spin waves, that is, controlled quantum storage. Based on the fidelity boundary of quantum storage, the condition of realizing squeezed thermal field quantum storage is studied in this paper. The fidelity boundary of quantum storage is the maximum fidelity that can be achieved by classical means. When the fidelity is greater than this boundary, quantum storage is realized. Through numerical calculation, the quantum storage fidelity boundary of squeezed hot light field and the relation between storage fidelity and storage efficiency are analyzed, and the conditions for realizing quantum storage are obtained. It provides a direct reference for the design of continuous variable quantum storage experiment.
【作者单位】：山西大学光电研究所量子光学与光量子器件国家重点实验室;山西大学极端光学协同创新中心;
【基金】：国家重点研发计划(批准号:2016YFA0301402) 国家自然科学基金(批准号:11322440,11474190,11304190) 霍英东教育基金山西省自然科学基金(批准号:2014021001) 山西三晋学者项目山西省回国留学人员科研资助项目资助的课题~~
【分类号】：O431.2

【相似文献】