Realization of Toffoli gate operation using four-level atoms in cavity QED system
作者：
Tang Shi-Qing* ;Zhang Deng-Yu;Xie Li-Jun;Zhan Xiao-Gui;Gao Feng
期刊：
中国物理B ,2009年18(1):56-61 ISSN：1674-1056
通讯作者：
Tang Shi-Qing
作者机构：
[Tang Shi-Qing; Xie Li-Jun] Xiangtan Univ, Fac Mat & Photoelect Phys, Xiangtan 411005, Peoples R China.;[Tang Shi-Qing; Xie Li-Jun; Zhang Deng-Yu; Gao Feng; Zhan Xiao-Gui] Hengyang Normal Univ, Dept Phys & Elect Informat Sci, Hengyang 421008, Peoples R China.
通讯机构：
[Tang Shi-Qing] X;Xiangtan Univ, Fac Mat & Photoelect Phys, Xiangtan 411005, Peoples R China.
关键词：
Toffoli gate;four-level atom;cavity QED;fidelity
摘要：
This paper proposes a scheme for realization of a three-qubit Toffoli gate operation using three four-level atoms by a selective atom-field interaction in a cavity quantum electrodynamics system. In the proposed protocol, the quantum information is encoded on the stable ground states of atoms, and atomic spontaneous emission is negligible as the large atom-cavity detuning effectively suppresses the spontaneous decay of the atoms. The influence of the dissipation on fidelity and success probability of the three-qubit Toffoli gate is also discussed. The scheme can also be applied to realize an N-qubit Toffoli gate and the interaction time required does not rise with increasing the number of qubits. © 2009 Chin. Phys. Soc. and IOP Publishing Ltd.
语种：
英文
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Thermal entanglement and teleportation in a three-qubit Heisenberg XXZ model with Dzyaloshinski-Moriya anisotropic antisymmetric interaction
作者：
Xie Li-Jun* ;Zhang Deng-Yu;Tang Shi-Qing;Zhan Xiao-Gui;Gao Feng
期刊：
中国物理B ,2009年18(8):3203-3207 ISSN：1674-1056
通讯作者：
Xie Li-Jun
作者机构：
[Tang Shi-Qing; Xie Li-Jun] Xiangtan Univ, Fac Mat & Photoelect Phys, Xiangtan 411005, Peoples R China.;[Tang Shi-Qing; Xie Li-Jun; Zhang Deng-Yu; Gao Feng; Zhan Xiao-Gui] Henyang Normal Univ, Dept Phys & Elect Informat Sci, Henyang 421008, Peoples R China.
通讯机构：
[Xie Li-Jun] X;Xiangtan Univ, Fac Mat & Photoelect Phys, Xiangtan 411005, Peoples R China.
关键词：
quantum teleportation;concurrence;fidelity;Bell inequality violation
摘要：
This paper investigates the thermal pairwise entanglement of a three-qubit Heisenberg XXZ chain in the presence of the Dzyaloshinski-Moriya (DM) anisotropic antisymmetric interaction and quantum teleportation when using the Heisenberg chain as a channel. The entanglement dependences on the DM interaction and temperature are given in detail. It obtains the relation between the concurrence and average fidelity, and shows that the same concurrence can lead different average fidelities. Moreover, it finds the thermally entangled states which do not violate the Bell inequalities, and can still be used for quantum teleportation. © 2009 Chin. Phys. Soc. and IOP Publishing Ltd.
语种：
英文
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Selective Atom-Cavity Interaction Scheme for Quantum Controlled-NOT Gate Using Four-Level Atoms in Cavity QED System
作者：
Tang Shi-Qing* ;Zhang Deng-Yu;Xie Li-Jun;Zhan Xiao-Gui;Gao Feng
期刊：
理论物理 ,2009年51(2):247-251 ISSN：0253-6102
通讯作者：
Tang Shi-Qing
作者机构：
[Tang Shi-Qing; Xie Li-Jun] Xiangtan Univ, Fac Mat & Photoelect Phys, Xiangtan 411005, Peoples R China.;[Tang Shi-Qing; Xie Li-Jun; Zhang Deng-Yu; Gao Feng; Zhan Xiao-Gui] Hengyang Normal Univ, Dept Phys & Elect Informat Sci, Hengyang 421008, Peoples R China.
通讯机构：
[Tang Shi-Qing] X;Xiangtan Univ, Fac Mat & Photoelect Phys, Xiangtan 411005, Peoples R China.
关键词：
Cavity QED;Controlled-NOT gate;Fidelity;Four-level atom
摘要：
We propose a scheme for realization a quantum Controlled-NOT gate operation using two four-level atoms through a selective atom-cavity interaction in cavity quantum electrodynamics system. In our protocol, the quantum information is encoded on the stable ground states of the two atoms. During the interaction between atoms and single-mode vacuum cavity-field, the atomic spontaneous emission is negligible as the large atom-cavity detuning effectively suppresses the spontaneous decay of the atoms. The influences of the dissipation and the deviation of interaction time on fidelity and corresponding success probability of the quantum Controlled-NOT gate and the experimental feasibility of our proposal are also discussed. © 2009 Chinese Physical Society and IOP Publishing Ltd.
语种：
英文
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Effects of Anisotropy on Entanglement in a Two-Qubit Heisenberg XYZ Chain with Intrinsic Decoherence
作者：
Xie Li-Jun* ;Zhang Deng-Yu;Tang Shi-Qing;Zhang Xiao-Gui;Gao Feng
期刊：
理论物理 ,2009年51(4):659-663 ISSN：0253-6102
通讯作者：
Xie Li-Jun
作者机构：
[Tang Shi-Qing; Xie Li-Jun; Zhang Deng-Yu; Gao Feng; Zhang Xiao-Gui] Hengyang Normal Univ, Dept Phys & Elect Informat Sci, Hengyang 421008, Peoples R China.;[Tang Shi-Qing; Xie Li-Jun] Xiangtan Univ, Fac Mat & Photoelect Phys, Xiangtan 411005, Peoples R China.
通讯机构：
[Xie Li-Jun] H;Hengyang Normal Univ, Dept Phys & Elect Informat Sci, Hengyang 421008, Peoples R China.
关键词：
anisotropy;concurrence;intrinsic decoherence;Heisenberg chain
摘要：
Taking the intrinsic decoherence effect into account, the entanglement of a two-qubit anisotropic Heisenberg XYZ chain in the presence of the Dzyaloshinski-Moriya (DM) anisotropic antisymetric interaction is investigated in this paper. Concurrence, the measurement of entanglement, is calculated. Compared with the anisotropic in XY plane, the DM interaction is another kind of anisotropic antisymmetric exchange interaction. It is shown that the intrinsic decoherence obviously suppresses the time evolution of the entanglement. The DM interaction only acts on the time evolution of the entanglement when the initial state is |ψ(0) cosα|01 + α|10 and weakens the degree of entanglement. The anisotropic in XY plane merely impacts on the time evolution of the entanglement when the system is initially in a state |ψ(0) cosα|00 +α|11. The sufficiently weak anisotropic in XY plane can effectively enhance the degree of entanglement. © 2009 Chinese Physical Society and IOP Publishing Ltd.
语种：
英文
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用Smolin态实现未知量子态的多体受控隐形传态(英文)
作者：
陈银花;张登玉;高峰;詹孝贵;唐世清;...
期刊：
衡阳师范学院学报 ,2009年30(06):28-33 ISSN：1673-0313
作者机构：
衡阳师范学院 物理与电子信息科学系,湖南,衡阳,421008
关键词：
受控隐形传态;Smolin态;贝尔测量
摘要：
提出了用Smolin态作纠缠通道实现未知单比特量子态的受控隐形传态方案.利用比特的Smolin态作量子纠缠通道,这个方案可以用来实现单比特量子态有个控制者的受控隐形传态.并且这个方案可以直接推广到D维空间量子态的多体受控隐形传态.
语种：
英文
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单模真空场中两个耦合二能级原子纠缠的时间演化特性
作者：
张登玉;谢利军;唐世清;詹孝贵;高峰
期刊：
量子电子学报 ,2009年26(1):65-68 ISSN：1007-5461
作者机构：
[张登玉; 谢利军; 唐世清; 詹孝贵; 高峰] 衡阳师范学院物理与电子信息科学系;湘潭大学材料与光电物理学院
关键词：
量子光学;单模真空场;二能级原子;纠缠;共生纠缠度
摘要：
研究了单模真空场中两个耦合二能级原子纠缠特性.运用密度矩阵方法,得到两能级原子约化密度矩阵.借助于共生纠缠度,研究两个耦合二能级原子纠缠的时间演化规律,讨论原子间偶极作用对原子间纠缠的影响.结果表明:原子间的偶极作用导致纠缠度的减少和时间演化周期的增加.
语种：
中文
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Quantum Logic Gates and Cluster States with Four-level Atoms in Cavity QED
作者：
Zhang, Deng-Yu* ;Tang, Shi-Qing;Xie, Li-Jun;Zhan, Xiao-Gui;You, Kai-Ming;...
期刊：
INTERNATIONAL JOURNAL OF THEORETICAL PHYSICS ,2009年48(9):2685-2691 ISSN：0020-7748
通讯作者：
Zhang, Deng-Yu
作者机构：
[Zhang, Deng-Yu; You, Kai-Ming; Gao, Feng; Tang, Shi-Qing; Xie, Li-Jun; Zhan, Xiao-Gui] Hengyang Normal Univ, Dept Phys & Elect Informat Sci, Hengyang 421008, Peoples R China.;[Tang, Shi-Qing; Xie, Li-Jun] Xiangtan Univ, Fac Mat & Photoelect Phys, Xiangtan 411005, Peoples R China.
通讯机构：
[Zhang, Deng-Yu] H;Hengyang Normal Univ, Dept Phys & Elect Informat Sci, Hengyang 421008, Peoples R China.
关键词：
Cavity QED;Quantum logic gates;Cluster states
摘要：
We propose a model to implement the two-qubit quantum logic gates, i.e., the quantum phase gate and the Controlled-NOT gate, and generate the atomic qubits cluster states with a large detuned interaction between four-level atoms and a single-mode cavity field. In the presented protocol, the quantum information is encoded on the stable ground states of the atoms, and the effect of decoherence from atomic spontaneous emission is negligible. In addition, the interaction between atoms and the cavity is large detuned, and the cavity is only virtually excited. Therefore, the scheme is insensitive to the cavity decay. The experimental feasibility of our proposal is also discussed.
语种：
英文
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可控传送两qubit系统任意量子态的方案
作者：
詹孝贵;张登玉;高峰;唐世清;谢利军
期刊：
量子电子学报 ,2009年26(1):44-49 ISSN：1007-5461
作者机构：
[詹孝贵; 张登玉; 高峰; 唐世清; 谢利军] 衡阳师范学院物理系
关键词：
量子光学;可控量子隐形传态;任意量子态
摘要：
提出了一个方案用来实现在有控制方控制下的量子网络中传送一个两qubit系统的任意量子态.整十方案所消耗的资源包括一个预先制备的由6个qubit构成的纠缠量子通道和一些经典通信资源.所使用的量子操作包括Bell测量、 H门、单qubit正交测量、 Panli门.方案中展示;只有当控制方合作时接受方才能恢复量子初态;如果有一个控制方不合作,量子态就不能完全恢复到系统的初态.
语种：
中文
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辐射场中二能级原子的量子态保真度
作者：
谢利军;张登玉;唐世清
期刊：
量子电子学报 ,2008年25(6):719-725 ISSN：1007-5461
作者机构：
[谢利军; 张登玉; 唐世清] 衡阳师范学院物理与电子信息科学系;湘潭大学材料与光电物理学院
关键词：
量子光学;保真度;二能级原子;辐射场
摘要：
利用半经典理论和量子理论研究辐射场与二能级原子(量子位)的相互作用,给出二能级原子的量子态保真度表达式。讨论了不同的原子初始态条件下,半经典理论中辐射场强度对量子态保真度的影响和量子理论中辐射场光子数对量子态保真度的影响。结果表明:在半经典理论中,当原子与辐射场发生共振相互作用时,初始处于叠加态的原子的量子态保真度与辐射场强度无关;原子的量子态保真度随时间呈周期性演化,其演化的频率受辐射强度或光子数调制。此外,选择适当的失谐量,能够有效地改变量子信息的保真度。
语种：
中文
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半经典理论中二能级原子的量子态保真度
作者：
谢利军;张登玉;唐世清;高峰
期刊：
衡阳师范学院学报 ,2008年29(03):41-44 ISSN：1673-0313
作者机构：
衡阳师范学院,物理与电子信息科学系,湖南,衡阳,421008;湘潭大学,材料与光电物理学院,湖南,湘潭,411105;[高峰; 唐世清; 谢利军; 张登玉] 衡阳师范学院
关键词：
辐射场;二能级原子;保真度;量子位;量子相干
摘要：
利用半经典理论研究辐射场与二能级原子（量子位）的相互作用,给出二能级原子的量子态保真度表达式。用数值计算讨论辐射强度对量子态保真度的影响。结果表明:原子的量子态保真度呈周期性演化,其演化的频率受辐射强度调制。此外,选择适当的失谐量,能够有效地改变量子信息的保真度。
语种：
中文
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辐射场与二能级原子相互作用的量子逻辑功能
作者：
张登玉;唐世清;谢利军;高峰
期刊：
衡阳师范学院学报 ,2007年28(06):48-51 ISSN：1673-0313
作者机构：
衡阳师范学院,物理与电子信息科学系,湖南,衡阳,421008;湘潭大学,材料与光电物理学院,湖南,湘潭,411105
关键词：
辐射场;二能级原子;量子位;量子逻辑门;幺正变换矩阵
摘要：
利用半经典理论和量子理论研究辐射场与二能级原子（量子位）的相互作用。将量子力学体系视为量子逻辑门,得到量子体系演化的幺正变换的矩阵表示,论述把量子力学体系波函数与量子逻辑门的输入输出态统一起来的方法,得出辐射场与原子相互作用能实现量子逻辑功能。结果有利于指导在实际中选取合适的遵守量子力学定律的两态系统完成量子逻辑操作。
语种：
中文
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