Because of the decoherence induced by surrounding environments, the maximally entangled state is usually difficult to prepare and maintain. In this study, a teleportation scheme was developed using a five-qubit non-maximally entangled state as the quantum channel. With Charlie’s permission, Alice and Bob could teleport a single-qubit state to each other deterministically. The scheme was introduced in a noiseless environment first. As we all know, when a non-maximally entangled state was used as the quantum channel, teleportation might fail, and the state to be transmitted would be destroyed. To solve this problem, in this scheme, an appropriate unitary tranasformation was performed on the non-maximally entangled state in advance with the help of an auxiliary qubit. Then, we analyzed the influence of the quantum noise on the fidelity of the desired state using the example of amplitude damping during the qubit distribution. Finally, we utilized the weak measurement and the corresponding reversing measurement to increase fidelity. The results showed that the weak measurement was an effective method for enhancing teleportation.

中文翻译：

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通过非最大纠缠态控制任意单个量子位的双向量子隐形传态

由于周围环境引起的退相干，最大纠缠态通常难以准备和维持。在这项研究中，使用五量子比特非最大纠缠态作为量子通道开发了一种隐形传态方案。在查理的许可下，爱丽丝和鲍勃可以确定性地将单量子比特状态传送到彼此。该方案首先是在无噪音环境中引入的。众所周知，当使用非最大纠缠态作为量子通道时，隐形传态可能会失败，传输的状态会被破坏。为了解决这个问题，在这个方案中，在一个辅助量子位的帮助下，预先对非最大纠缠态进行了适当的幺正变换。然后，我们以量子位分布期间的振幅阻尼为例，分析了量子噪声对所需状态保真度的影响。最后，我们利用弱测量和相应的反向测量来提高保真度。结果表明，弱测量是一种增强隐形传态的有效方法。