Complete and Partial Separability Conditions of Mixed State for a Quantum Network of Any Nodes
By using the block division method in matrix calculus, this article successfully calculate the expectationvalues of the generating operators and the correlation tensors for quantum network of any nodes. Thence, by meansof the criterion of entanglement in terms of the covariance correlation tensor in quantum network theory, this articlediscusses the complete and partial separability conditions of the mixed quantum state for a quantum network of anynodes and judge the separability of a quantum state in the generalcase of any nodes for two examples.
作 者： QIAN Shang-Wu GU Zhi-Yu 作者单位： QIAN Shang-Wu(physics Department, Peking University, Beijing 100871, China)GU Zhi-Yu(Physics Department, Capital Normal University, Beijing 100037, China)
刊 名： 理论物理通讯(英文版) ISTIC SCI 英文刊名： COMMUNICATIONS IN THEORETICAL PHYSICS 年，卷(期)： 2004 42(9) 分类号： 关键词： covariance correlation tensor in quantum network theory criterion of entanglement mixed state