Measurable entanglement for tripartite quantum pure states of qubits
Measurable entanglement for tripartite quantum pure states of qubits
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量子位三方量子纯态的可测量纠缠
DOI：
10.1103/physreva.76.022324
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发表时间：
2007-08
影响因子：
2.9
通讯作者：
Yu, Chang-Shui
中科院分区：
文献类型：
--
作者：
Song, He-Shan;Yu, Chang-Shui
我们证明了对于量子比特的三重量子纯态，只要复合量子系统有四个副本可用，就可以通过简单的投影测量来实验测量随机局部操作和经典通信分类方面的所有类型的纠缠。特别是，在实验中可以精确地确定降密度矩阵的纠缠态，即使它们是混合态。通过引入一个具有明确物理意义的有趣方程，也证明了协助的并发性是可测量的。
We show that for tripartite quantum pure states of qubits, all the kinds of entanglement in terms of stochastic local operations and classical communications classification are experimentally measurable by simple projective measurements, provided that four copies of the composite quantum system are available. In particular, the entanglement of reduced density matrices, even though they are mixed states, can be exactly determined in experiment. Concurrence of assistance is also shown to be measurable by introducing an interesting equation with explicit physical meanings.