Long-distance quantum state transfer through cavity-assisted interaction  

作　　者：李宇宁 梅锋 於亚飞 张智明 

机构地区：[1]Laboratory of Photonic Information Technology and Laboratory of Quantum Information Technology,South China Normal University

出　　处：《Chinese Physics B》2011年第11期1-4,共4页中国物理B（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.60978009);the National Basic Research Program of China(Grant Nos.2009CB929604 and 2007CB925204)

摘　　要：We propose a scheme for long-distance quantum state transfer between different atoms based on cavity-assisted interactions. In our scheme, a coherent optical pulse sequentially interacts with two distant atoms trapped in separated cavities. Through the measurement of the state of the first atom and the homodyne detection of the final output coherent light, the quantum state can be transferred into the second atom with a success probability of unity and a fidelity of unity. In addition, our scheme neither requires the high-Q cavity working in the strong coupling regime nor employs the single-photon quantum channel, which greatly relaxes the experimental requirements.We propose a scheme for long-distance quantum state transfer between different atoms based on cavity-assisted interactions. In our scheme, a coherent optical pulse sequentially interacts with two distant atoms trapped in separated cavities. Through the measurement of the state of the first atom and the homodyne detection of the final output coherent light, the quantum state can be transferred into the second atom with a success probability of unity and a fidelity of unity. In addition, our scheme neither requires the high-Q cavity working in the strong coupling regime nor employs the single-photon quantum channel, which greatly relaxes the experimental requirements.

关 键 词：quantum state transfer coherent optical pulse homodyne detection 

分 类 号：O431.2[机械工程—光学工程]