压缩真空态中原子与场的量子纠缠和量子discord
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摘要
在压缩真空库中,研究了原子与场的相互作用下二比特体系的量子discord和量子纠缠的动力学行为.重点分析了原子的初始态系数和压缩真空库的压缩系数对量子纠缠和量子discord的影响.通过数值分析我们得到,随着原子的初始态系数和压缩真空库的压缩系数值的增加,量子纠缠和量子discord都会减小,但量子纠缠比量子discord减小的更快一些.最后研究了在原子的初始态系数和压缩真空库的压缩系数的值相同的情况下,量子discord比量子纠缠存在的时间更长些.
In the squeezed vacuum reservoir,we study the dynamics behavior of quantum discord and quantum entanglement in two-qubit system interaction of the field-atom. We analyze the influences of the atomic initial state parameter and the squeeze parameter of the squeezed vacuum reservoir on the quantum entanglement and quantum discord. By numerical analysis,we conclude that the quantum entanglement and quantum discord will be reduced with the increases of the atomic initial state parameter and the squeeze parameter. However the quantum entanglement reduces quicker than the quantum discord. Finally,we find that the existence time of the quantum discord is longer than that of the quantum entanglement when the atomic initial state parameter and the squeeze parameter have the same value.
In the squeezed vacuum reservoir,we study the dynamics behavior of quantum discord and quantum entanglement in two-qubit system interaction of the field-atom. We analyze the influences of the atomic initial state parameter and the squeeze parameter of the squeezed vacuum reservoir on the quantum entanglement and quantum discord. By numerical analysis,we conclude that the quantum entanglement and quantum discord will be reduced with the increases of the atomic initial state parameter and the squeeze parameter. However the quantum entanglement reduces quicker than the quantum discord. Finally,we find that the existence time of the quantum discord is longer than that of the quantum entanglement when the atomic initial state parameter and the squeeze parameter have the same value.
引文
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[16]Li L,Yang G H.Quantum correlation dynamics in a two qubit system under dissipation environments[J].J.At.Mol.Phys.,2015,32:281(in Chinese)[李磊,杨国辉.耗散环境下二比特体系的量子关联性质研究[J].原子与分子物理学报,2015,32:281]
[17]Zhang B Y,Yue J L,Yan X Q.Quantum Zeno effect on atomic population inversion[J].J.At.Mol.Phys.2016,33:561(in Chinese)[张勃英,岳建林,闫学群.量子Zeno效应对原子布居翻转的影响[J].原子与分子物理学报,2016,33:561]
[2]Mebrahtu A.Parametric oscillation with squeezed vacuum reservoirs[J].J.Mod.Opt.,2005,52:813.
[3]Anwar J.Laser phase noise quenching via squeezed vacuum reservoir[J].Phys.Rev.A,2005,72:913.
[4]Wang Z S,Wu C,Feng X L,et al.Effects of a squeezed-vacuum reservoir on geometric phase[J].Phys.Rev.A,2007,75:411.
[5]Liao X P,Fang J S,Fang M F,et al.Entanglement and quantum discord dynamics of two atoms in a broadband squeezed vacuum bath[J].Inter.J.Theor.Phys.,2013,52:1729.
[6]Ji Y H,Liu Y M.Investigations into quantum correlation of coupled qubits in a squeezed vacuum reservoir[J].Chinese Phys.B,2013,22:86.
[7]Xiang S H,Song K H,Wen W,et al.Quantum entanglement and nonlocality properties of two-mode squeezed thermal states in a common-reservoir model[J].Commun.Theor.Phys.,2011,55:232.
[8]Kowalewska K A,Leoński W.Squeezed vacuum reservoir effect for entanglement decay in the nonlinear quantum scissor system[J].J.Phys.B:At.Mol.Opt.Phys.,2010,20:205503.
[9]Ali M M,Chen P W,Goan H S.Decoherence-free subspace and disentanglement dynamics for two qubits in a common non-markovian squeezed reservoir[J].Phys.Rev.A,2010,82:2828.
[10]Knill E,Laflamme R.On the power of one bit of quantum information[J].Phys.Rev.Lett.,1998,81:5672.
[11]Maziero J,Werlang T,Fanchini FF,et al.Systemreservoir dynamics of quantum and classical correlations[J].Phys.Rev.A,2010,81:022116
[12]Luo S.Quantum discord for tow-qubit systems[J].Phys.Rev.A,2008,77:140.
[13]Ali M,Rau A R P,Alber G.Quantum discord for two-qubit X states[J].Phys.Rev.A,2010,81:359.
[14]Ikram M,Li F L,Zubairy M S.Disentanglement in a two-qubit system subjected todissipation environment[J].Phys.Rev.A,2007,75:650.
[15]Yue Z L,Yan X Q.Entropy exchange and entanglement between atom and field in dissipation field[J].J.At.Mol.Phys.,2014,31:964(in Chinese)[岳转林,闫学群.耗散系统中原子和场的熵交换与纠缠[J].原子与分子物理学报,2014,31:964]
[16]Li L,Yang G H.Quantum correlation dynamics in a two qubit system under dissipation environments[J].J.At.Mol.Phys.,2015,32:281(in Chinese)[李磊,杨国辉.耗散环境下二比特体系的量子关联性质研究[J].原子与分子物理学报,2015,32:281]
[17]Zhang B Y,Yue J L,Yan X Q.Quantum Zeno effect on atomic population inversion[J].J.At.Mol.Phys.2016,33:561(in Chinese)[张勃英,岳建林,闫学群.量子Zeno效应对原子布居翻转的影响[J].原子与分子物理学报,2016,33:561]