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Search Results: 1 - 10 of 109068 matches for " Shao-ming Liu "
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Evolution equation for entanglement of assistance
Zong-Guo Li,Ming-Jing Zhao,Shao-Ming Fei,W. M. Liu
Physics , 2010, DOI: 10.1103/PhysRevA.81.042312
Abstract: We investigate the time evolution of the entanglement of assistance when one subsystem undergoes the action of local noisy channels. A general factorization law is presented for the evolution equation of entanglement of assistance. Our results demonstrate that the dynamics of the entanglement of assistance is determined by the action of a noisy channel on the pure maximally entangled state, in which the entanglement reduction turns out to be universal for all quantum states entering the channel. This single quantity will make it easy to characterize the entanglement dynamics of entanglement of assistance under unknown channels in the experimental process of producing entangled states by assisted entanglement.
Bis[(E)-1-(3,4-dichlorobenzylideneamino)-4-methylpyridinium] bis(maleonitriledithiolato)nickelate(II)
Jian-Lan Liu,Bing-Qian Yao,Qi Liu,Shao-Ming Zhang
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809001159
Abstract: The asymmetric unit of the title compound, (C13H11Cl2N2)2[Ni(C4N2S2)2], contains one-half of a centrosymmetric [Ni(mnt)2] anion (where mnt is maleonitriledithiolate or 1,2-dicyano-1,2-ethylenedithiolate) and an (E)-1-(3,4-dichlorobenzylideneamino)-4-methylpyridinium cation. In the anion, the coordination around the Ni atom is a distorted square. In the cation, the aromatic rings are oriented at a dihedral angle of 7.81 (3)°. In the crystal structure, intermolecular C—H...N hydrogen bonds link the cations and anions. π–π Contacts between the nickel dithiolene and pyridine rings and between the benzene and pyridine rings, [centroid–centroid distances = 3.682 (3) and 3.643 (3) , respectively] may further stabilize the structure.
Shao-Ming Fang,Min Hu,Song-Tao Ma,Chun-Sen Liu
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809043839
Abstract: In the title coordination polymer, [Hg2Cl4(C6H12N2)]n, each HgII center within the chain is four-coordinated by one terminal Cl atom, two bridging μ2-Cl atoms, and one N-atom donor from a μ2-1,4-diazabicyclo[2.2.2]octane (μ2-daco) ligand in a distorted tetrahedral geometry. The daco ligand acts as an end-to-end bridging ligand and bridges adjacent HgII centers, forming a chain running along [001]. Weak C—H...Cl hydrogen-bonding interactions link the chains into a three-dimensional network. Comparison of the structural differences with previous findings suggests that the space between the two N donors, as well as the skeletal rigidity in N-heterocyclic linear ligands, may play an important role in the construction of such supramolecular networks.
Bis(1-amino-4-methylpyridinium) bis(1,2-dicyanoethene-1,2-dithiolato-κ2S,S′)nickelate(II)
Jian-Lan Liu,Bing-Qian Yao,Shao-Ming Zhang
Acta Crystallographica Section E , 2008, DOI: 10.1107/s1600536808018886
Abstract: The asymmetric unit of the title compound, (C6H9N2)2[Ni(C4N2S2)2], contains one half of an [Ni(mnt)2]2 anion (mnt is maleonitriledithiolate or 1,2-dicyanoethene-1,2-dithiolate) and one 1-amino-4-methylpyridinium cation. The NiII atom is located on an inversion centre. In the crystal structure, intermolecular N—H...N hydrogen bonds link the molecules.
Bound of Entanglement of Assistance and Monogamy Constraints
Zong-Guo Li,Shao-Ming Fei,Sergio Albeverio,W. M. Liu
Physics , 2009, DOI: 10.1103/PhysRevA.80.034301
Abstract: We investigate the entanglement of assistance which quantifies capabilities of producing pure bipartite entangled states from a pure tripartite state. The lower bound and upper bound of entanglement of assistance are obtained. In the light of the upper bound, monogamy constraints are proved for arbitrary n-qubit states.
A Note on Pseudo-Hermitian Systems with Point Interactions and Quantum Separability
Shao-Ming Fei
Physics , 2007, DOI: 10.1007/s10582-006-0384-z
Abstract: We study the quantum entanglement and separability of Hermitian and pseudo-Hermitian systems of identical bosonic or fermionic particles with point interactions. The separability conditions are investigated in detail.
Exactly Solvable Many-Body Systems and Pseudo-Hermitian Point Interactions
Shao-Ming Fei
Physics , 2004, DOI: 10.1023/B:CJOP.0000014366.93476.92
Abstract: We study Hamiltonian systems with point interactions and give a systematic description of the corresponding boundary conditions and the spectrum properties for self-adjoint, PT-symmetric systems and systems with real spectra. The integrability of one dimensional many body systems with these kinds of point (contact) interactions are investigated for both bosonic and fermionic statistics.
Integrability and PT-symmetry of $N$-Body Systems with Spin-coupling $δ$-Interactions
Shao-Ming Fei
Physics , 2003, DOI: 10.1023/B:CJOP.0000010528.72652.0d
Abstract: We study the PT-symmetric boundary conditions for "spin"-related $\delta$-interactions and the corresponding integrability for both bosonic and fermionic many-body systems. The spectra and bound states are discussed in detail for spin-1/2 particle systems.
On Integrability and Pseudo-Hermitian Systems with Spin-Coupling Point Interactions
Shao-Ming Fei
Physics , 2005, DOI: 10.1007/s10582-005-0111-1
Abstract: We study the pseudo-Hermitian systems with general spin-coupling point interactions and give a systematic description of the corresponding boundary conditions for PT-symmetric systems. The corresponding integrability for both bosonic and fermionic many-body systems with PT-symmetric contact interactions is investigated.
Maximally entangled state can be a mixed state
Zong-Guo Li,Ming-Jing Zhao,Shao-Ming Fei,Heng Fan,W. M. Liu
Physics , 2009,
Abstract: We find that the mixed maximally entangled states exist and prove that the form of the mixed maximally entangled states is unique in terms of the entanglement of formation. Moreover, even if the entanglement is quantified by other entanglement measures, this conclusion is still proven right. This result is a supplementary to the generally accepted fact that all maximally entangled states are pure. These states possess important properties of the pure maximally entangled states, for example, these states can be used as a resource for faithful teleportation and they can be distinguished perfectly by local operations and classical communication.
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