论文标题
通过非航空增强相关渠道性能
Enhancing phase-covariant channel performance with non-unitality
论文作者
论文摘要
我们根据其非单纯性程度分析量子通道的量子通信性能。特别是，我们得出了分析公式，以在纯状态和最大输出纯度上最小和最大通道保真度。接下来，我们介绍了一种非单身性的度量，并通过考虑量子通道的经典混合物来展示如何在Unital和最大非空中图之间操纵。最后，我们证明，最大值的保真度和最大输出纯度随着非单纯性而增加，并提出了几个示例。有趣的是，非航空也可以延长量子纠缠并导致其重生。
We analyze quantum communication properties of phase-covariant channels depending on their degree of non-unitality. In particular, we derive analytical formulas for minimal and maximal channel fidelity on pure states and maximal output purity. Next, we introduce a measure of non-unitality and show how to manipulate between unital and maximally non-unital maps by considering classical mixtures of quantum channels. Finally, we prove that maximal fidelity and maximal output purity increase with non-unitality and present several examples. Interestingly, non-unitality can also prolong quantum entanglement and lead to its rebirth.
