Teleportation via a two-qubit Heisenberg XYZ model in the presence of phase decoherence

Teleportation via a two-qubit Heisenberg XYZ model in the presence of phase decoherence
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在存在相位退相干的情况下通过两个量子位海森堡 XYZ 模型进行隐形传输

DOI:
10.1016/j.physa.2008.03.036
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发表时间:
2008-07
影响因子:
3.3
通讯作者:
--
中科院分区:
物理与天体物理2区
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--
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研究了在相位退相干的情况下,利用两量子比特海森堡XYZ模型与非均匀磁场组成的纠缠信道进行量子隐形传态。结果表明,信道的初始态对量子隐形传态的完全纠缠度和平均保真度起着重要的作用。我们的隐形传态方案的显著特点是,当初始系统处于|单位面积=m2| 01 +n2| 10 μ m时,即使存在相位退相干效应,对应的平均保真度也总是大于2/3。此外,在一定条件下,通过调节非均匀磁场的大小,可以优化量子隐形传态的平均保真度。
We investigate quantum teleportation using the entangled channel consisting of a two-qubit Heisenberg XYZ model with a nonuniform magnetic field in the presence of phase decoherence. It is shown that the initial state of the channel plays an important role in the fully entangled fraction and the average fidelity of teleportation. The distinct feature of our teleportation scheme is that when the initial system is in the state |Ψ〉=m2|01〉+n2|10〉, the corresponding average fidelity is always larger than 2/3 even if there exist phase decoherence effects. Moreover, under certain circumstance, the average teleportation fidelity can be optimized by adjusting the magnitude of the nonuniform magnetic field.
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