论文标题
多部分量子系统的基于投影的同时限制
Projection based lower bounds of concurrence for multipartite quantum systems
论文作者
论文摘要
我们研究了任意维度多部分量子状态的同意。三方量子状态的并发的分析下限是通过将高维状态预测到$ 2 \ otimes 2 \ otimes 2 $取代来得出的。然后将结果推广到任意多部分量子系统。此外，该方案使我们能够通过将高维状态投射到任意下的较低维替代的情况下，从而获得任意四方量子状态的同意下限。通过详细的示例，我们表明我们的结果改善了并发的现有下限。
We study the concurrence of arbitrary-dimensional multipartite quantum states. Analytical lower bounds of concurrence for tripartite quantum states are derived by projecting high-dimensional states to $2\otimes 2\otimes 2$ substates. The results are then generalized to arbitrary multipartite quantum systems. Furthermore, the scheme enables us obtain lower bounds of concurrence for arbitrary four-partite quantum states by projecting high-dimensional states to arbitrary given lower dimensional substates. By detailed examples we show that our results improve the existing lower bounds of concurrence.
