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arXiv 1111.5967quant-ph
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退相干环境中单量子比特态的隐形传态

Teleportation of the one-qubit state in decoherence environments

Ming-Liang Hu

摘要:

研究了单量子比特态的标准量子隐形传态,其中信道受退相干影响,信道态的演化由Lindblad形式的主方程控制.详细的计算表明,量子隐形传态的质量取决于纠缠度和信道态的纯度,只有两者的最佳匹配才能保证标准量子隐形传态的最高保真度.结果还表明,对于不同速率的输出态,退相干会导致Bloch球在不同方向上发生畸变,这意味着不同的输入态将以不同的量子效率被传送.

英文摘要:

We study standard quantum teleportation of one-qubit state for the situation in which the channel is subject to decoherence, and where the evolution of the channel state is ruled by a master equation in the Lindblad form. A detailed calculation reveals that the quality of teleportation is determined by both the entanglement and the purity of the channel state, and only the optimal matching of them ensures the highest fidelity of standard quantum teleportation. Also our results demonstrated that the decoherence induces distortion of the Bloch sphere for the output state with different rates in different directions, which implies that different input states will be teleported with different fidelities.

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