Local unitary equivalence of multiqubit mixed quantum states
Local unitary equivalence of multiqubit mixed quantum states
复制标题
多量子位混合量子态的局部酉等价
DOI：
10.1103/physreva.89.062325
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发表时间：
2014-06-23
影响因子：
2.9
通讯作者：
Jing, Naihuan
中科院分区：
文献类型：
--
作者：
Li, Ming;Zhang, Tinggui;Jing, Naihuan
我们提出了一个在局域幺正操作下对多比特量子态进行完全分类的可计算准则。该判据可以用来判断多量子比特系统中两个量子态是否局域么正等价。一旦得到肯定的答案，我们就能够进一步精确地计算相应的酉算子。由于该方案是基于量子力学观测量的平均值，它提供了一种判断量子态局域等价性的实验方法。
We present a computable criterion for completely classifying multiqubit quantum states under local unitary operations. The criterion can be used to detect whether two quantum states in multiqubit systems are locally unitarily equivalent or not. Once a positive answer is obtained, we are further able to compute the corresponding unitary operators precisely. Since the scheme is based on the mean values of some quantum mechanical observables, it supplies an experimental way to judge the local equivalence of quantum states.