Effects of Pure Dzyaloshinskii-Moriya Interaction with Magnetic Field on Entanglement in Intrinsic Decoherence

作者:李大创[1,2,3];王先萍[4];李虎[1,2];李小曼[1,2];杨名[2];曹卓良[1,2] 刊名:中国物理快报:英文版 上传者:谭立龙

【摘要】We investigate the effects of pure Dzyaloshinskii Moriya (DM) interaction with magnetic field on entanglement in intrinsic decoherence, assuming that the system is initially in four Bell states |φ±〉 = (|00) ± |11〉)/√2 and |ψ±〉 = (|01) ±|10〉)/√2, respectively. It is found that if the system is initially in the state p1(0) = |φ+〉〈φ+1, the entanglement can obtain its maximum when the DM interaction vector D is in the plane of XOZ and magnetic field B = By with the infinite time t, moreover the entanglement is independent of By and t when By is perpendicular to D. In addition, we obtain similar results when the system is initially in the states p2(0) = |φ-〉〈φ-| or p3 (0) = |ψ+〉〈ψ+1. However, we find that if the system is initially in the state P4 (0) = |ψ-〉〈ψ-l, the entanglement can obtain its maximum for infinite t, when the DM vector is in the plane ofYOZ, XOZ, or XOY, with the magnetic field parallel to X, Y, or Z axis, respectively. Moreover, when the axial B is perpendicular to D for the initial state p4(O), the negativity oscillates with time t and reaches a stable value, the larger the value of B is, the greater the stable value is, and the shorter the oscillation time of the negativity is. Thus we can adjust the direction and value of the external magnetic field to obtain the maximal entanglement, and avoid the adverse effects of external environment in some initial state. This is feasible within the cun'ent experimental technology.

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