摘要
This paper investigates an analytical expression of teleportation fidelity in the teleportation scheme of a single mode of electromagnetic field. The fidelity between the original squeezed coherent state and the teleported one is expressed in terms of the squeezing parameter r and the quantum channel parameter （two-mode squeezed state） p. The results of analysis show that the fidelity increases with the increase of the quantum channel parameter p, while the fidelity decreases with the increase of the squeezing parameter r of the squeezed state. Thus the coherent state （r= O） is the best quantum signal for continuous variable quantum teleportation once the quantum channel is built.
This paper investigates an analytical expression of teleportation fidelity in the teleportation scheme of a single mode of electromagnetic field. The fidelity between the original squeezed coherent state and the teleported one is expressed in terms of the squeezing parameter r and the quantum channel parameter （two-mode squeezed state） p. The results of analysis show that the fidelity increases with the increase of the quantum channel parameter p, while the fidelity decreases with the increase of the squeezing parameter r of the squeezed state. Thus the coherent state （r= O） is the best quantum signal for continuous variable quantum teleportation once the quantum channel is built.
基金
Project supported by the National Natural Science Foundation of China(Grant Nos.60773085,60801051,and 60970109)
the National Natural Science Foundation of China-Korea Science and Engineering Foundation International Collaborative Research Funds(Grant Nos.60811140346 and F01-2008-000-10021-0)
Shanghai Jiao Tong University Participation in Research Program,China(Grant Nos.T030PRP18001 and T03013002)
作者简介
Corresponding author. E-mail： gqhe@sjtu.edu.cn
