关于两粒子量子态可分性及关联性的注记

A Note on Separability and Correlations of 2-Qubit Quantum States

本文讨论了两粒子系统中量子态的可分性与关联性,分别得到了纯态与混合态可分的充要条件,及其元素必须满足的条件.用量子态元素之间的关系,给出了乘积态的刻画.此外,通过元素刻画了量子态的左(右)经典关联性与经典关联性.

Separability and correlations of 2-qubit quantum states are discussed in this paper, some sufficient and necessary conditions of separability of pure and mixed states are obtained in terms of their entries, respectively. With some relationships among its entries, product states are characterized. Lastly, left （resp. right） classical correlations and classical correlations are characterized in terms of their entries, respectively.