Two Qubits Entanglement Dynamics in1D Heisenberg Chain with Intrinsic Decoherence

To reveal how the decoherence modifies the time evolution of the entanglement of quantum system, the intrinsic decoherence approach and the entanglement of formation are used, and the time evolution of entanglement for two-qubit 1D quantum Heisenberg model in an external uniform magnetic field is derived. It is shown that the external magnetic field can strengthen the effects of the intrinsic decoherence on the entanglement of the system.

Entanglement of a two-qubit anisotropic Heisenberg X Y Z chain in nonuniform magnetic fields with intrinsic decoherence

Taking the intrinsic decoherence effect into account, this paper investigates the entanglement of a two-qubit anisotropic Heisenberg XYZ model in the presence of nonuniform external magnetic fields by employing the concurrence as entanglement measure. It is found that both the intrinsic decoherence and the anisotropy of the system give a significant suppression to the entanglement. Moreover it finds that the initial state of the system plays an important role in the time evolution of the entanglement, which means that the entanglement of the system is independent of the nonuniformity and uniformity of the magnetic field when the system is in the initial state ｜ψ （0）） = ｜00） and [ψ′ （0）） = m ｜01） ＋ n ｜10）, respectively.

Influence of Intrinsic Decoherence on Entanglement in Two-Qubit Quantum Heisenberg XYZ Chain

Taking the intrinsic decoherence effect into account, we investigate the time evolution of entanglement for two-qubit XYZ Heisenberg model in an external uniform magnetic field. Concurrence, the measurement of entanglement,is calculated. We show how the intrinsic decoherence modifies the time evolution of the entanglement and find that at short-time case, concurrence is oscillating as increasing magnetic field, which implies that entanglement may be enhanced or weakened in some time regions.

Effects of Anisotropy on Entanglement in a Two-Qubit Heisenberg XYZ Chain with Intrinsic Decoherence

考虑内在的 decoherence 效果， two-qubit 的纠纷各向异性的 Heisenberg XYZ 链面对 Dzyaloshinski Moriya (DM ) ，各向异性的 antisymetric 相互作用在这篇论文被调查。同时发生，纠纷的测量，被计算。与相比在 XY 飞机各向异性， DM 相互作用是另一种各向异性的反对称的交换相互作用。内在的 decoherence 显然压制纠纷的时间进化，这被显示出。当起始的状态是 |ψ (0 )= cosα|01 + sinα|10 并且削弱纠纷的度时， DM 相互作用仅仅对纠纷的时间进化起作用。在当系统开始在州的 |ψ (0 ) 时，飞机仅仅在纠纷的时间进化上影响的 XY 各向异性 = cosα|00 +sin α|11。足够地弱在飞机能有效地提高的 XY 各向异性纠纷的度。

Effects of intrinsic decoherence on the entanglement of a two-qutrit 1D optical lattice chain with nonlinear coupling

We have investigated the intrinsic decoherence on the entanglement of a two-qutrit one-dimensional （1D） optical lattice chain with nonlinear coupling. As a measure of the entanglement, the negativity of the system is calculated. It is shown that the influence of intrinsic decoherence on the entanglement varies in different initial systems.

Intrinsic Decoherence on Two-Qubit Heisenberg XX Chain

量远距传物被在模型 ofMilburn 的内在的 decoherence 在一个外部一致磁场把纠缠的状态 oftwo-qubit Heisenberg XX 链用作资源调查。尽管量纠纷和量远距传物上的内在的 decoherence 在不同起始的系统施加不同效果，处于起始的状态的不同 eigenstates 的合适的磁场和可能性能削弱效果。

Influence of Non-Uniform Magnetic Field on Quantum Teleportation in Heisenberg XY Model

By considering the intrinsic decoherence, the validity of quantum teleportation of a two-qubit 1D Heisenberg XY chain in a non-uniform external magnetic field is studied. The fidelity as the measurement of a possible quantum teleportation is calculated and the effects of the non-uniform magnetic field and the intrinsic decoherence are discussed. It is found that anti-parallel magnetic field is more favorable for teleportation and the fidelity is suppressed by the intrinsic decoherence.

两粒子XXZ海森堡系统中的量子纠缠动力学

研究了考虑内禀退相干情况下,两粒子XXZ海森堡系统中量子纠缠在各种外界因素影响下的动态演化规律。研究发现无论系统的初态是否处于最大纠缠态,内禀退相干都会对系统纠缠的含时演化有明显的抑制作用。如果系统的初态为纠缠态|ψ(0)〉=c|01〉+d|10〉,系统的纠缠与各向异性参数和外加磁场没有关系,却受到Dzyaloshinskii-Moriya(DM)相互作用程度和内禀退相干因素的明显影响;如果系统的初态为纠缠态|ψ(0)〉=a|00〉+b|11〉,系统的纠缠与DM相互作用大小和各向异性参数无关,纠缠程度不仅要受到内禀退相干因素的影响,还会被外加磁场进一步削弱。