J4 ›› 2014, Vol. 31 ›› Issue (4): 442-448.

• 《量子电子学报》创刊三十周年纪念专辑 • 上一篇    下一篇

高维量子态存储

丁冬生,周志远,史保森   

  1. 中国科学技术大学光学与光学工程系, 中国科学院量子信息重点实验室, 量子信息与量子物理协同创新中心,合肥 230026
  • 出版日期:2014-07-28 发布日期:2014-07-30
  • 通讯作者: 史保森(1970-)博士,教授。主要从事量子光学、量子信息、原子光学的实验研究。 E-mail:drshi@ustc.edu.cn。
  • 作者简介:丁冬生(1987-)博士生。主要从事基于原子系综的量子信息研究。Email:dds@mail.ustc.edu.cn
  • 基金资助:
    国家自然科学基金(11174271, 61275115, 10874171)、科技部“973”项目支持(2011CBA00200)

A quantum memory for high-dimensional states

Ding Dong-Sheng ,Zhou Zhi-Yuan, Shi Bao-Sen   

  1. 1 Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei, Anhui 230026, China and 2 Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
  • Published:2014-07-28 Online:2014-07-30

摘要: 量子通信网络主要由用于存储和操纵量子态的存储单元和联络存储单元之间的信息载体构成。光子是信息载体的最佳选择,存储单元可以由固态材料或气态原子组成。相对于二维空间,编码于一个高维空间的光子可以携带更大的信息量。若能够实现编码于高维空间的量子态存储,则在增大存储单元存储容量的同时,还可以提高网络的信道容量和传输效率,因而高维量子态的存储研究成为当前量子信息领域的热点领域。本文简要回顾了国内外在高维量子态存储方面进展,着重介绍了近期基于冷原子系综实现单光子条件下高维量子态存储的突破性进展,提出了构建高维量子网络需要解决的关键问题。

关键词: 量子光学;量子存储器;高维编码态;轨道角动量;存储

Abstract: Quantum network mainly consists of a memory used for storing and manipulating quantum information and an information carrier through which different memories could connect with others. Usually quantum information is encoded in a two-dimensional space of a photon, a robust information carrier. In this case, each photon could carry a bit of information. If the photon could live in a high-dimensional space, then the information carried by each photon could be increased significantly, the channel capacity of the network and the transmission efficiency would then be greatly enlarged. Moreover, storing high-dimensional states in quantum memory leads to significant improvements in storage capacity. After briefly introducing the progresses achieved at home and abroad, we review a significant breakthrough towards the realization of high-dimensional quantum memories based on a cold atomic ensemble in detail, and show some basic problems remaining which need to be solved to build the future quantum internet.

Key words: quantum optics;quantum memory; quantum state encoded in a high-dimensional space; orbital angular momentum; storage

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