轨道角动量态的量子存储（英文）  

Quantum storage of orbital angular momentum states

作　　者：史保森[1,2] 丁冬生[1,2] 张伟[1,2] 

机构地区：[1]中国科学院量子信息重点实验室,中国科学技术大学,安徽合肥230026 [2]量子信息与量子科技前沿协同创新中心,中国科学技术大学,安徽合肥230026

出　　处：《物理学进展》2017年第3期98-118,共21页Progress In Physics

基　　金：supported by the National Fundamental Research Program of China (Grant No. 2 011CBA00200);the National Natural Science Foundation of China (Grant Nos. 11174271, 61275115, 61435011, 61525504)

摘　　要：轨道角动量(OAM)光束在精密测量、微小粒子的操控以及基础物理研究等领域具有重要的应用。基于OAM编码的光信息处理由于其大信道容量的优点成为经典和量子通信领域的研究热点,并已在近几年取得了许多突破性进展。在量子信息领域,量子中继是克服通信保真度随传输距离呈指数衰减、实现长距离量子通信的关键技术,其中用于存储量子信息的光量子存储器是组成量子中继的关键器件。尽管人们已成功实现了编码于偏振、路径、time bin等自由度的量子态的存储,然而到2013年以前,存储编码于OAM自由度的量子态的量子存储器仍未实现。近年来我们研究组一直专注于OAM量子态的存储实验研究。本文在概述了量子存储器的各项性能标准后,着重介绍我们组在OAM量子态存储方面取得的一系列研究进展:包括OAM量子比特(qubit)和量子三维态(qutrit)、二维和高维OAM纠缠态以及包含OAM自由度的超纠缠和杂化纠缠的量子存储。这些进展为未来构建高维量子信息网络奠定坚实的基础。Light carrying orbital angular momentum （OAM） has many exciting applications in the studies of fun- damental quantum physics, optical manipulation and trapping of particles, astrophysics, high-precision optical measurements and optical communication both in classical and quantum fields, etc. In quantum information field, a photon encoded with information in its OAM degrees of freedom enables networks to carry significantly more information and increase their capacity greatly due to the inherent infinite degrees of freedom for OAM. In order to realize a long-distance quantum communication, quantum repeaters have to be used to overcome the problem of communication fidelity decreasing exponentially with the channel length for, where, quantum memories for photons, used for storing quantum informa- tion, are key components of a quantum repeater. So far, there are many works reporting on storing quantum states encoded in for example degree of polarization, path, time bin, etc, however, there have been very few works realizing the storage of OAM states. During the past years, our group has been focusing on the experimental realization of quantum memories for OAM states. In this review, after briefly introducing the main benchmarks for quantum memories, we will show a series of im- portant progresses achieved along this research direction in our group, including the storage of OAM qubit and qutrit, of OAM entanglement in a two-dimensional and a high-dimensional space, of hyper- entanglement and hybrid entanglement consisting of OAM and other degree of freedom, We believe that all results are very promising for realizing a high-dimensional quantum network in the future.

关 键 词：量子存储 轨道角动量 量子存储 原子系综 量子信息 

分 类 号：O413[理学—理论物理] TP333[理学—物理]