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Fidelity of quantum teleportation in correlated quantum channels

机译:相关量子通道中量子传送的保真度

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We have studied the standard quantum teleportation of an arbitrary single qubit state for the situation in which a two-qubit X-state as a resource successively passes through correlated quantum channels, including amplitude-damping, phase-damping, and depolarizing channels. Analytical expressions of full entangled fraction (which is related to fidelity of quantum teleportation) suffered from these noisy channels are presented. The results demonstrate that there is a threshold value mu, above which the source state even subjected to decoherence becomes useful for quantum teleportation. Besides, we also develop an effective strategy to enhance quantum teleportation fidelity under decoherence channels by means of filtering operation. The underlying physical mechanism of the enhancement of fidelity is also analyzed.
机译:我们已经研究了任意单个量子位状态的标准量子传送,以便在其中作为资源连续地通过相关量子通道的情况,包括幅度阻尼,相位阻尼和去极化通道。 介绍了患有这些嘈杂通道遭受的全缠绕分数(与量子传送相关的保真度)的分析表达。 结果表明,存在阈值MU,上面甚至受到破坏的源状态对于量子传送也是有用的。 此外,我们还通过过滤操作,制定有效的策略来增强在移层通道下的量子传送保真度。 还分析了提高保真度的潜在物理机制。

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