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	1. Enhanced Teleportation Through anisotropic Heisenberg Quantum Spin Chains
	Hao Xiang ,Zhu Shiqun
	Physics 17 September 2008
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	Abstract:The teleportation via the channel of the thermal equilibrium states in anisotropic Heisenberg XYZ chains is analyzed. It is found that there are the critical temperatures below which entanglement teleportation can be realized. Entanglement teleportation is enhanced through anisotropic XYZ chains in contrast to the isotropic Heisenberg one. Anisotropic spin exchanges can increase these critical temperatures for the teleportation. Entanglement can be transferred in the ferromagnetic anisotropic Heisenberg chain while it cannot be done in the ferromagnetic isotropic one. The average fidelity of the teleportation can be improved in the antiferromagnetic chains.
	TO cite this article:Hao Xiang ,Zhu Shiqun . Enhanced Teleportation Through anisotropic Heisenberg Quantum Spin Chains[OL].[17 September 2008] http://en.paper.edu.cn/en_releasepaper/content/24105


	2. PAIRWISE ENTANGLEMENT WITH SPIN IMPURITY
	Dong Xiaoyan,Zhu Shiqun ,Hao Xiang
	Physics 17 September 2008
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	Abstract:The zero-temperature pairwise entanglement is investigated in the antiferromagnetic Heisenberg chain with one impure spin s. The impurity location is varied from the open end to a mediate site of the spin chain. It is found that the pairwise entanglement is proportional to 1/s. This means that the entanglement will disappear in the classical systems as s → ∞. Compared to the isotropic Heisenberg chain without impurity, the efficient control of the spin coupling between the impurity spin and nearest-neighbor spins can enhance the pairwise entanglement.
	TO cite this article:Dong Xiaoyan,Zhu Shiqun ,Hao Xiang . PAIRWISE ENTANGLEMENT WITH SPIN IMPURITY[OL].[17 September 2008] http://en.paper.edu.cn/en_releasepaper/content/24095

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	3. Swap of Quantum Information between Two-End States in an Open Ferromagnetic Spin Chain
	Tao Song,Shiqun Zhu,Xiang Hao
	Physics 16 September 2008
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	Abstract:The bidirectional transfer of quantum information can be realized in an open Heisenberg ferromagnetic spin chain in a magnetic field. The information is encoded in the population distribution of the states at two end spins. The fidelity for swapping the information is used to evaluate the effective transmission of the population. It is found that the evolution of the fidelity shows a periodical behavior. The period is increased with increasing the length of the chain and the magnetic field while it decreases with increasing the coupling strength.
	TO cite this article:Tao Song,Shiqun Zhu,Xiang Hao. Swap of Quantum Information between Two-End States in an Open Ferromagnetic Spin Chain[OL].[16 September 2008] http://en.paper.edu.cn/en_releasepaper/content/24076


	4. Swap Action in a Solid-State Controllable Anisotropic Heisenberg Model
	Hao Xiang ,Zhu Shiqun
	Physics 16 September 2008
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	Abstract:Correct swap action can be realized via the control of the anisotropic Heisenberg interaction in solid-state quantum systems. The conditions of performing a swap are derived by the dynamics of arbitrary bipartite pure state. It is found that swap errors can be eliminated in the presence of symmetric anisotropy. In realistic quantum computers with unavoidable fluctuations, the gate fidelity of swap action is estimated. The protocol of quantum computation via the anisotropic Heisenberg interaction is implemented in the 1D quantum dots. In this scheme, the slanting and time independent magnetic field can be used to adjust the anisotropy.
	TO cite this article:Hao Xiang ,Zhu Shiqun . Swap Action in a Solid-State Controllable Anisotropic Heisenberg Model[OL].[16 September 2008] http://en.paper.edu.cn/en_releasepaper/content/24052


	5. Quantum computation in semiconductor quantum dots of electron-spin asymmetric anisotropic exchange
	Xiang Hao,Shiqun Zhu
	Physics 12 September 2008
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	Abstract:The universal quantum computation is obtained when there exists asymmetric anisotropic exchange between electron spins in coupled semiconductor quantum dots. The asymmetric Heisenberg model can be transformed into the isotropic model through the control of two local unitary rotations for the realization of essential quantum gates. The rotations on each qubit are symmetrical and depend on the strength and orientation of asymmetric exchange. The implementation of the axially symmetric local magnetic fields can assist the construction of quantum logic gates in anisotropic coupled quantum dots. This proposal can efficiently use each physical electron spin as a logical qubit in the universal quantum computation.
	TO cite this article:Xiang Hao,Shiqun Zhu. Quantum computation in semiconductor quantum dots of electron-spin asymmetric anisotropic exchange[OL].[12 September 2008] http://en.paper.edu.cn/en_releasepaper/content/24010


	6. Density-Matrix Renormalization-Group Study of the Entanglement andEntropy in Antiferromagnetic Heisenberg Spin Chain with Domain Walls
	Ren Jie ,Zhu Shiqun
	Physics 10 September 2008
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	Abstract:By using the method of density-matrix renormalization-group theory, the ground state entanglement in the spin$-1/2$ isotropic antiferromagnetic Heisenberg chain is studied when there are domain walls generated by a boundary magnetic field. It is found that the pairwise entanglement of odd-bond two qubits decreases and even-bond two qubits increases to stable values alternately when the magnetic field increases. The pairwise entanglement of odd-bond can equal to that of even-bond for a suitable value of the magnetic field. When the magnetic field increases further, the entanglement of even-bond can be larger than that of odd-bond. The entanglement entropy increases and then almost saturates as the number of spin sites increases. Due to the domain walls, the entanglement entropy of even-bond decreases to a minimum value and then increases as the magnetic field increases.
	TO cite this article:Ren Jie ,Zhu Shiqun . Density-Matrix Renormalization-Group Study of the Entanglement andEntropy in Antiferromagnetic Heisenberg Spin Chain with Domain Walls[OL].[10 September 2008] http://en.paper.edu.cn/en_releasepaper/content/23932


	7. Switching of Spontaneous Emission of a Two-level Atom Embedded in One-dimensional Tunable Photonic Crystals
	Han Zhang,Hanzhuang Zhang
	Physics 25 March 2008
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	Abstract:We investigate the spontaneous emission of a two-level atom embedded in one-dimensional photonic crystals (PCs). The delay Green function, which captures many of the physically relevant aspects of the problem is deduced from the structure of the one-dimensional PCs. The population involution and distribution of upper level are investigated by utilizing the delay Green function. Especially, it is shown that the spontaneous emission is switched on and off by nonlinear tuning of photonic density of states of the one-dimensional PCs. And we emphasize here that the methodology can also be applied to alternate left-right handed PCs. It is shown that the photon-atom bound state is present even when the atom is embedded in alternate left-right handed material PCs.
	TO cite this article:Han Zhang,Hanzhuang Zhang. Switching of Spontaneous Emission of a Two-level Atom Embedded in One-dimensional Tunable Photonic Crystals[OL].[25 March 2008] http://en.paper.edu.cn/en_releasepaper/content/19704


	8. The phase control of spontaneous emission from a microwave-driven three-atom embedded in Photonic Crystals
	Ke Zhang,Yan ping Zhu,Han zhuang Zhang
	Physics 11 March 2008
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	Abstract:Through dressed states picture, we investigate the spontaneous emission spectrum of a microwave-driven three-level atom embedded in Photonic Crystals (PCs) reservoir. The two models: \\\\\\\"upper level coupling\\\\\\\" and \\\\\\\"lower level coupling\\\\\\\" are under research. Due to the effect of the density of state in PCs, the fluorescence spectra display a different behavior compared with that in vacuum when the phase of the microwave field changes.
	TO cite this article:Ke Zhang,Yan ping Zhu,Han zhuang Zhang. The phase control of spontaneous emission from a microwave-driven three-atom embedded in Photonic Crystals[OL].[11 March 2008] http://en.paper.edu.cn/en_releasepaper/content/19204


	9. Geometric Phase and Quantum Phase Transition in Ultracold ⁸⁷Rb Atom Gas with Radiant Field
	Chen gang,Jiuqing Liang,Liu W.-M
	Physics 21 December 2007
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	Abstract:The second-order quantum phase transition in two-species Bose-Einstein condensates of ⁸⁷Rb atoms coupled by a quantized radiant field is demonstrated explicitly in terms of the energy spectrum which is obtained in the thermodynamic limit. We show the relation between the criticality and the non-adiabatic geometric phase which is derived by means of a time-dependent unitary transformation. The geometric phase vanishes when the coupling parameter between the atom and field is below the critical value and depends linearly on the atom-number N above the critical point possessing a discontinuous first-order derivative. The asymptotic behavior of the geometric phase at vicinity of phase transition point is obtained analytically. It is also demonstrated that the quantum phase transition is realizable below the critical temperature of BEC and can be detected experimentally by measuring the abrupt change of the average photon-number.
	TO cite this article:Chen gang,Jiuqing Liang,Liu W.-M. Geometric Phase and Quantum Phase Transition in Ultracold ⁸⁷Rb Atom Gas with Radiant Field[OL].[21 December 2007] http://en.paper.edu.cn/en_releasepaper/content/17234


	10. Entanglement in an Anisotropic Spin-$1$ Heisenberg
	Yan Zhu,Shiqun Zhu,Xiang Hao
	Physics 02 January 2007
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	Abstract:The entanglement in an anisotropic spin-$1$ Heisenberg chain with the uniform magnetic field is investigated. The ground-state entanglement will undergo two different kinds of transitions when the anisotropy $\\\\Delta$ and the amplitude of the magnetic field $B$ are varied. The thermal entanglement of the nearest neighboring always declines when $B$ is increased no matter what the value of the anisotropy is. It is very interesting to note that the entanglement of the next nearest neighboring can be increased to a maximum at certain magnetic field. Regardless of the boundary conditions, the nearest neighboring entanglement is always decreased and approaches to a constant value when the size of the system is very large. The constant value of open boundary condition is much larger than that of periodic boundary condition.
	TO cite this article:Yan Zhu,Shiqun Zhu,Xiang Hao. Entanglement in an Anisotropic Spin-$1$ Heisenberg[OL].[ 2 January 2007] http://en.paper.edu.cn/en_releasepaper/content/10554

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