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Controlled Teleportation of an Unknown N-qubit Entangled GHZ State

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Communications in Theoretical Physics 2007年第6期47卷 1045-1048页

作者： jianG Wei-xing fang jian-xing ZHU Shi-Qun SHA Jin-Qiao School of Physical Science and Technology Suzhou University Suzhou 215006 China

A scheme for controlled teleportation of an unknown N-qubit entangled GHZ state from the sender Alice to the distant receiver Bob is proposed. And m-qubit GHZ state is sufficient for the task of control by m spatially- separated supervisors. Conditioned on the local operations executed by all participants, Bob can faithfully restore the original state by performing relevant unitary transformations with the aid of some classical message about measurement results. Anyone＇s absence will absolutely lead to the failure of teleportation.

关键词： quantum information quantum teleportation entangled GHZ state Bell state measurement

Generalized Synchronization of Phase Differences in Three Lasers

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Chinese Physics Letters 2001年第6期18卷 727-730页

作者： ZHU Shi-Qun LUO Xiao-Qin fang jian-xing Department of Physics College of SciencesSuzhou UniversitySuzhou 215006

A linear array of three identical lasers that are coupled mutually in space is investigated theoretically by integration of the laser equations. It is shown that the generalized synchronization of phase differences in the laser fields appears with intermediate coupling when the laser intensities are totally chaotic and chaotically synchronized. Both intensities and phase differences are totally chaotic at smaller coupling constants. The lasers are also changed from coherent light to incoherent one when the couplings between lasers are decreased.

关键词： Synchronization synchronization chaotic

Entanglement and Teleportation via Thermally Entangled State of Anisotropic Heisenberg XYZ Chain with Inhomogeneous External Magnetic Field

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Communications in Theoretical Physics 2008年第2期49卷 333-337页

作者： NI Hui-Ying fang jian-xing ZHU Shi-Qun SHA Jin-Qiao jianG Wei-xing School of Physics and Technology Suzhou University Suzhou 215006 China

In this paper we study the entanglement in a two-qubit spin in the XYZ model, and teleport a two-qubit entangled state using this spin chain in the condition of the thermal equilibrium as a quantum channel. We investigate the effects of the interaction of z-component Jz, the inhomogeneous magnetic field b, the anisotropy γ and the temperature T on the entanglement and fidelity. In order to characterize the quality of the teleported state, we research the average fidelity Fα. High average fidelity of the teleportation is obtained when the temperature is very low. Under some condition, we also find that when innomogeneity increases to a certain value, the average fidelity can exhibit a larger revival than that for less values of b.

关键词： Heisenberg chain thermal entanglement quantum teleportation fidelity

Teleportation of N-Particle Entangled GHZ State via Entanglement Swapping

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Communications in Theoretical Physics 2006年第4X期46卷 595-598页

作者： SHA Jin-Qiao fang jian-xing ZHU Shi-Qun jianG Wei-xing QIAN Xue-Min School of Physical Science and Technology Suzhou University Suzhou 215006 China

In this scheme, N non-maximally entangled particle pairs are used as quantum channel to teleport an unknown N-particle entangled GHZ state via entanglement swapping. In order to realize this teleportation, the sender Alice operates Bell-state measurement on particles belonging to herself. Then she informs the results to the receiver Bob through classical communication. According to the results, Bob operates corresponding transformation to reconstruct the initial state. The advantage of this scheme is that it needs only one common unitary matrix for Alice＇s different results, which has a more general meaning. As a special case, teleporting an unknown three-particle entangled GHZ state is proposed.

关键词： quantum teleportation N-particle entangled GHZ state entanglement swapping

Quantum Logic Networks for Probabilistic Teleportation of an Arbitrary Three-Particle State

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Communications in Theoretical Physics 2005年第4X期44卷 611-614页

作者： QIAN Xue-Mir fang jian-xing ZHU Shi-Qun XI Yong-Jun School of Physical Science and Technology Suzhou University Suzhou 215006 China

The scheme for probabilistic teleportation of an arbitrary three-particle state is proposed. By using single qubit gate and three two-qubit gates, efficient quantum logic networks for probabilistic teleportation of an... 详细信息

关键词： probabilistic teleportation arbitrary three-particle state quantum logic networks

Probabilistic Teleportation of an Arbitrary Two-Particle State and Its Quantum Circuits

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Communications in Theoretical Physics 2006年第6期45卷 1013-1017页

作者： GUO Zhan-Ying fang jian-xing ZHU Shi-Qun QIAN Xue-Min School of Physical Science and Technology Suzhou University Suzhou 215006 China Department of Physics Jiaozuo Normal College Jiaozuo 454001 China

Two simple schemes for probabilistic teleportation of an arbitrary unknown two-particle state using a non-maximally entangled EPR pair and a non-maximally entangled GHZ state as quantum channels are proposed. After receiving Alice＇s Bell state measurement results, Bob performs a collective unitary transformation on his inherent particles without introducing the auxiliary qubit. The original state can be probabilistically teleported. Meanwhile, quantum circuits for realization of successful teleportation are also presented.

关键词： probabilistic teleportation arbitrary two-particle state unitary transformation quantum circuit

Generation of Four-Mode Cluster-Type Entangled Coherent States in Free-Traveling Optical Fields

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Communications in Theoretical Physics 2011年第3期55卷 426-430页

作者： HE Dai-Guo DONG Yu-Li fang jian-xing QIAN Li HU Jie School of Physical Science and Technology Suzhou University Suzhou 215006 China

In this paper, we propose an optical scheme to generate four-mode cluster-type entangled coherent states （ECSs） in free traveling optical fields by using two single-photon sources, coherent state sources, beam splitters, pho- todetectors, cross-Kerr media, and phase shifters. And the success probability of the states preparation is calculated. At last we discuss the experimental feasibility of such proposal.

关键词： cluster states coherent states beam splitters cross-Kerr media

Quantum Teleportation of One-to-Many Using (n+1)-Particle Entanglement

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Communications in Theoretical Physics 2007年第10期48卷 623-625页

作者： SHA Jin-Qiao fang jian-xing jianG Wei-xing School of Physical Science and Technology,Suzhou University,Suzhou 215006,China School of Physical Science and Technology Suzhou University Suzhou 215006 China

In this paper,quantum teleportation of one-to-many using(n+1)-particle entanglement is *** thesender(Alice)wants to transmit an unknown quantum state to a distant receiver(Bob),similar to the previous schemes,Alice performs Bell-state measurement on particles belonging to herself and informs the receiver the results through theclassical *** that,it needs to perform the Hadamard operation on the other(n-1)particles and measurethem as *** the aid of the measurement results,Bob can operate a corresponding unitary transformation on hisparticle to reconstruct the original *** course,the reconstruction may realize at either location of n,but it cannotrealize at all locations at the same time.

关键词： quantum teleportation quantum entangled state unitary transformation

Quantum Teleportation of One-to-Many Using （n ＋ 1）-Particle Entanglement

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Communications in Theoretical Physics 2007年第4X期48卷 623-625页

作者： SHA Jin-Qiao fang jian-xing jianG Wei-xing School of Physical Science and Technology Suzhou University Suzhou 215006 China

In this paper, quantum teleportatlon of one-to-many using （n ＋1）-particle entanglement is presented. If the sender （Alice） wants to transmit an unknown quantum state to a distant receiver （Bob）, similar to the previous schemes, Alice performs Bell-state measurement on particles belonging to herself and informs the receiver the results through the classical channel. After that, it needs to perform the Hadamard operation on the other （n - 1） particles and measure them as well. With the aid of the measurement results, Bob can operate a corresponding unitary transformation on his particle to reconstruct the original state. Of course, the reconstruction may realize at either location of n, but it cannot realize at all locations at the same time.

关键词： quantum teleportation quantum entangled state unitary transformation