Noiseless quantum channels are critical to share a pure maximally entangled state for performing an ideal teleportation protocol. However, in reality the shared entanglement severely degraded due to decoherence. In this paper, we propose a quantum teleportation channel protection scheme to enhance the teleportation fidelity in presence of decoherence. Before the entangled pair enters the decoherence channel, the weak measurement and flip operations are applied to transfer the qubit to a more robust state to the effects of the noise. After the decoherence channel the reversed flip operations and weak measurement reversal are applied to recover the initial state. We illustrate our protected teleportation scheme and compare it with a protocol based on weak measurement reversal. The numerical results show that the average teleportation fidelity of our proposed scheme can be significantly improved. Although the proposed entanglement protection scheme is probabilistic, after a successful entanglement transmission, we use the standard teleportation protocol which has probability one.

中文翻译：

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通过翻转弱测量提高退相干下的量子隐形传态保真度

无噪声量子通道对于共享纯最大纠缠态以执行理想的隐形传输协议至关重要。然而，实际上共享纠缠由于退相干而严重退化。在本文中，我们提出了一种量子隐形传态通道保护方案，以提高存在退相干的隐形传态保真度。在纠缠对进入退相干通道之前，应用弱测量和翻转操作将量子位转移到更稳健的状态以应对噪声的影响。在退相干通道之后，应用反向翻转操作和弱测量反转来恢复初始状态。我们说明了我们受保护的隐形传输方案，并将其与基于弱测量反转的协议进行了比较。数值结果表明，我们提出的方案的平均隐形传态保真度可以显着提高。虽然提出的纠缠保护方案是概率性的，但在纠缠传输成功后，我们使用概率为一的标准隐形传输协议。