Continuous-variable quantum teleportation of even and odd coherent states through varied gain channels  

作　　者：李英 张静 张俊香 张天才 

机构地区：[1]State Key Laboratory of Quantum Optics and Quantum Optics Devices, Shanxi University, Taiyuan 030006 China [2]Institute of Quantum Optics & Quantum Information Science and Department of Physics,Shangluo Normal College, Shangzhou, 726000, China

出　　处：《Chinese Physics B》2006年第8期1766-1771,共6页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China （Grant Nos 10434080, 10374062, 60578018）, NSFC-RFBR Joint Program, Research Funds for Returned Scholar Abroad from Shanxi Province and also supported by the CFKSTIP （Grant No 705010） and PCSIRT from Ministry of Education of China.

摘　　要：This paper has investigated quantum teleportation of even and odd coherent states in terms of the EPR entanglement states for continuous variables. It discusses the relationship between the fidelity and the entanglement of EPR states, which is characterized by the degree of squeezing and the gain of classical channels. It shows that the quality of teleporting quantum states also depends on the characteristics of the states themselves. The properties of teleporting even and odd coherent states at different intensities are investigated. The difference of teleporting two such kinds of quantum states are analysed based on the quantum distance function.This paper has investigated quantum teleportation of even and odd coherent states in terms of the EPR entanglement states for continuous variables. It discusses the relationship between the fidelity and the entanglement of EPR states, which is characterized by the degree of squeezing and the gain of classical channels. It shows that the quality of teleporting quantum states also depends on the characteristics of the states themselves. The properties of teleporting even and odd coherent states at different intensities are investigated. The difference of teleporting two such kinds of quantum states are analysed based on the quantum distance function.

关 键 词：quantum teleportation odd and even coherent state FIDELITY 

分 类 号：O413[理学—理论物理]