摘要
针对三体纯态,研究了分布纠缠的概念及纠缠的度量tangle,推导出tangle的具体表达式及tangle之间满足的关系式,由tangleτAB、τAC、τBC、τABC出发,分析三体纯态的分类,发现以往给出的三体纯态有6类分布并不正确.利用三体纯态的正则形式给出了新的类型,对三体纯态,至少有7类分布.作为一个推广,利用纠缠度τAB、τAC、τBC、τABC给出了直积态与纠缠态的判据.
Aiming at pure three-qubit states, the concept of distributed entanglement and the corresponding measure called tangle are discussed in detail, the expressions and the inherent relations among the tangles are proposed. Analysed the kinds of pure three-qubit states with the tangles τAB、τAC、τBC and τABC, it is found that at least seven kinds of distributed entanglements exist for the states,but not six kinds as in Martin P and Vladimir B's conclusion. A criterion for product and entangled states is provided simuhaneously.
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2006年第2期243-245,共3页
Journal of Xi'an Jiaotong University
基金
国家自然科学基金资助项目(40375010
60278019)
陕西省科学计划基金资助项目(2004A15)
陕西省教育厅科学研究计划资助项目(05JK288)
关键词
三体纯态
纠缠度
分类
pure three-qubit state
entanglement
kind