journal6 ›› 2010, Vol. 31 ›› Issue (4): 67-70.
• 物理与电子 • 上一篇 下一篇
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湖南省科技计划资助项目(2008FJ3078)
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摘要:通过对三粒子纠缠GHZ态隐形传输令牌环网通信过程的分析,得到了影响保真度的2个关节点,并分别对其保真度进行了计算.计算结果表明:当|a|=0、|b|=1或|a|=1、|b|=0时,保真度达最大值1;当|a|=|b|=2/2时,Bell基测量时的保真度为0.5,平均保真度为0.67.Von Neuman测量时的保真度与分析角θ有关,若θ=π/4±kπ (k=0,1,2,…),保真度取最大值1;若θ=π/4±kπ/2 (k=0,1,3,5…)时,保真度取最小值0,平均保真度为0.5.
关键词: 量子通信, 隐形传态, GHZ态, 保真度
Abstract: Through analyzing quantum communication in the token-ring network of three-particles entangled GHZ state,two articulation points are found and the fidelity is calculated.The calculation results show that the maximum fidelity is 1 for |a|=0,|b|=1 or |a|=1,|b|=0.For |a|=|b|=2/2,the fidelity is 0.5.The average fidelity is 0.67 at Bell-state measurement.With Von Neuman measurement,the fidelity relates to analyzer angle θ.If θ=π/4±kπ (k=0,1,2,…),the maximum fidelity is 1;if θ=π/4±kπ/2/(k=0,1,3,5…),the minmum of the fidelity is zero.The average fidelity is 0.5 .
Key words: quantum communication, teleportation, GHZ state, fidelity
周小清, 邬云文. 三粒子GHZ态隐形传输令牌环网的保真度分析[J]. journal6, 2010, 31(4): 67-70.
ZHOU Xiao-Qing, WU Yun-Wen. Token-Ring Network Fidelity of Teleportation by Three-Particles Entangled GHZ State[J]. journal6, 2010, 31(4): 67-70.
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https://zkxb.jsu.edu.cn/CN/Y2010/V31/I4/67