Ke Wu

Publications (6)0 Total impact

• Source

  Available from: arxiv.org

  Article: Entanglement conditions for multi-mode states

  Zong-Guo Li, Shao-Ming Fei, Zhi-Xi Wang, Ke Wu
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  ABSTRACT: We provide a class of inequalities for detecting entanglements in multi-mode systems. Necessary conditions for fully separable, bi-separable and sufficient conditions for fully entangled states are explicitly presented.
  02/2007;
• Source

  Available from: 202.204.208.109

  Article: Lower Bounds of Concurrence for Tripartite Quantum Systems

  Xiu-Hong Gao, Shao-Ming Fei, Ke Wu
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  ABSTRACT: We derive an analytical lower bound for the concurrence of tripartite quantum mixed states. A functional relation is established relating concurrence and the generalized partial transpositions.
  12/2006;
• Source

  Available from: arxiv.org

  Article: Separability and Entanglement of Identical Bosonic Systems

  Xiao-Hong Wang, Shao-Ming Fei, Ke Wu
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  ABSTRACT: We investigate the separability of arbitrary $n$-dimensional multipartite identical bosonic systems. An explicit relation between the dimension and the separability is presented. In particular, for $n=3$, it is shown that the property of PPT (positive partial transpose) and the separability are equivalent for tripartite systems.
  09/2006;
• Source

  Available from: arxiv.org

  Article: On PPT States in KxMxN Composite Quantum Systems

  Xiao-Hong Wang, Shao-Ming Fei, Zhi-Xi Wang, Ke Wu
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  ABSTRACT: We study the general representations of positive partial transpose (PPT) states in ${\cal C}^K \otimes {\cal C}^M \otimes {\cal C}^N$. For the PPT states with rank-$N$ a canonical form is obtained, from which a sufficient separability condition is presented.
  02/2005;
• Source

  Available from: arxiv.org

  Article: Separability of rank two quantum states on multiple quantum spaces with different dimensions

  Shao-Ming Fei, Xiu-Hong Gao, Xiao-Hong Wang, Zhi-Xi Wang, Ke Wu
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  ABSTRACT: We consider the separability of rank two quantum states on multiple quantum spaces with different dimensions. The sufficient and necessary conditions for separability of these multiparty quantum states are explicitly presented. A nonseparability inequality is also given, for the case where one of the eigenvectors corresponding to nonzero eigenvalues of the density matrix is maximally entangled.
  06/2003;
• Source

  Available from: arxiv.org

  Article: Separability of rank two quantum states on multiple quantum spaces

  Shao-Ming Fei, Xiu-Hong Gao, Xiao-Hong Wang, Zhi-Xi Wang, Ke Wu
  [show abstract] [hide abstract]
  ABSTRACT: Explicit sufficient and necessary conditions for separability of $N$-dimensional rank two multiparty quantum mixed states are presented. A nonseparability inequality is also given, for the case where one of the eigenvectors corresponding to nonzero eigenvalues of the density matrix is maximally entangled.
  09/2002;