By same means we present a lower bound on entanglement of formation of states in 2 n systems . this lower bound can be calculated easily and has distinct physical meaning 用同样的方法本文还给出了一个可计算的、而且有明确物理意义的2 (
2.
Entanglement of formation for high dimensional quantum states is investigated . an analytical expression of the entanglement of formation for a special quantum mixed states is obtained 摘要研究了高维量子混合态的生成纠缠,给出了一类特殊量子混合态的生成纠缠的解析表示。