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Search Results: 1 - 10 of 145546 matches for " WANG Shao-ming "
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A Note on Normal Forms of Quantum States and Separability
Ming Li,Shao-Ming Fei,Zhi-Xi Wang
Physics , 2008, DOI: 10.1088/0253-6102/50/6/12
Abstract: We study the normal form of multipartite density matrices. It is shown that the correlation matrix (CM) separability criterion can be improved from the normal form we obtained under filtering transformations. Based on CM criterion the entanglement witness is further constructed in terms of local orthogonal observables for both bipartite and multipartite systems.
Separability of Tripartite Quantum Systems
Ming Li,Shao-Ming Fei,Zhi-Xi Wang
Physics , 2008,
Abstract: We investigate the separability of arbitrary dimensional tripartite sys- tems. By introducing a new operator related to transformations on the subsystems a necessary condition for the separability of tripartite systems is presented.
Upper bound of the fully entangled fraction
Ming Li,Shao-Ming Fei,Zhi-Xi Wang
Physics , 2008, DOI: 10.1103/PhysRevA.78.032332
Abstract: We study the fully entangled fraction of quantum states. An upper bound is obtained for arbitrary dimensional bipartite systems. This bound is shown to be exact for the case of two-qubit systems. An inequality related the fully entangled fraction of two qubits in a three-qubit mixed state has been also presented.
Separability and Entanglement of Quantum States Based on Covariance Matrices
Ming Li,Shao-Ming Fei,Zhi-Xi Wang
Mathematics , 2008, DOI: 10.1088/1751-8113/41/20/202002
Abstract: We investigate the separability of quantum states based on covariance matrices. Separability criteria are presented for multipartite states. The lower bound of concurrence proposed in Phys. Rev. A. 75, 052320 (2007) is improved by optimizing the local orthonormal observables.
Bounds for multipartite concurrence
Ming Li,Shao-Ming Fei,Zhi-Xi Wang
Mathematics , 2010, DOI: 10.1016/S0034-4877(10)80022-9
Abstract: We study the entanglement of a multipartite quantum state. An inequality between the bipartite concurrence and the multipartite concurrence is obtained. More effective lower and upper bounds of the multipartite concurrence are obtained. By using the lower bound, the entanglement of more multipartite states are detected.
Canonical Form and Separability of PPT States on Multiple Quantum Spaces
Xiao-Hong Wang,Shao-Ming Fei
Physics , 2005,
Abstract: By using the "subtracting projectors" method in proving the separability of PPT states on multiple quantum spaces, we derive a canonical form of PPT states in ${\Cb}^{K_1} \otimes {\Cb}^{K_2} \otimes ... \otimes {\Cb}^{K_m} \otimes {\Cb}^N$ composite quantum systems with rank $N$, from which a sufficient separability condition for these states is presented.
A Note on Entanglement of Formation and Generalized Concurrence
Shao-Ming Fei,Zhi-Xi Wang,Hui Zhao
Physics , 2004, DOI: 10.1016/j.physleta.2004.07.030
Abstract: We discuss a kind of generalized concurrence for a class of high dimensional quantum pure states such that the entanglement of formation is a monotonically increasing convex function of the generalized concurrence. An analytical expression of the entanglement of formation for a class of high dimensional quantum mixed states is obtained.
Separability and Entanglement of Identical Bosonic Systems
Xiao-Hong Wang,Shao-Ming Fei,Ke Wu
Mathematics , 2006, DOI: 10.1088/0305-4470/39/36/L01
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.
A Complete Set of Local Invariants for a Family of Multipartite Mixed States
Xiao-Hong Wang,Shao-Ming Fei,Ke Wu
Mathematics , 2008, DOI: 10.1088/1751-8113/41/2/025305
Abstract: We study the equivalence of quantum states under local unitary transformations by using the singular value decomposition. A complete set of invariants under local unitary transformations is presented for several classes of tripartite mixed states in KxMxN composite systems. Two density matrices in the same class are equivalent under local unitary transformations if and only if all these invariants have equal values for these density matrices.
Local Unitary Equivalent Consistence for n Party States and Their (n-1)-Party Reduced Density Matrices

WANG Zhen,WANG He-Ping,WANG Zhi-Xi,FEI Shao-Ming,

中国物理快报 , 2011,
Abstract:
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