摘要
量子不可克隆定律赋予了量子通信基于物理学原理的安全性,其代价是长程传输的光子损耗不能使用传统的中继放大器来克服.量子中继及量子U盘是实现远程量子通信的两条可行的技术路线,近期本团队在这两条路线上都取得了显著进展:首次基于吸收型存储器建立多模式量子中继,并将相干光存储时间提升至1 h.本文介绍了量子通信、量子中继及量子U盘的基本原理,在此基础上介绍近期本团队取得的相关成果.
The non-cloning theorem provides the unconditional security for quantum communication but forbids the use of classical amplifiers.Therefore,the inevitable channel loss prevents the long-distance quantum communication.Protocols involving quantum memories can overcome this problem through the approach of quantum repeaters and transportable quantum memories.Based on rare-earth-ion doped crystals,we recently demonstrate an elementary link of a quantum repeater based on absorptive quantum memories and extend the optical storage time to 1 h.Here we provide a brief introduction to quantum communication,quantum repeaters and transportable quantum memories.Based on this,we review our recent achievements in this field.
作者
周宗权
李传锋
ZHOU Zongquan;LI Chuanfeng(CAS Key Laboratory of Quantum Information,University of Science and Technology of China,Hefei 230026,China;CAS Center for Excellence in Quantum Information and Quantum Physics,University of Science and Technology of China,Hefei 230026,China)
基金
国家重点研发计划(No.2017YFA0304100)资助.
关键词
量子存储
量子网络
量子中继
量子U盘
quantum memories
quantum network
quantum repeater
transportable quantum memory